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Commit | Line | Data |
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0ad19a3f | 1 | /* |
2 | * lxc: linux Container library | |
3 | * | |
4 | * (C) Copyright IBM Corp. 2007, 2008 | |
5 | * | |
6 | * Authors: | |
9afe19d6 | 7 | * Daniel Lezcano <daniel.lezcano at free.fr> |
0ad19a3f | 8 | * |
9 | * This library is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU Lesser General Public | |
11 | * License as published by the Free Software Foundation; either | |
12 | * version 2.1 of the License, or (at your option) any later version. | |
13 | * | |
14 | * This library is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * Lesser General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU Lesser General Public | |
20 | * License along with this library; if not, write to the Free Software | |
250b1eec | 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
0ad19a3f | 22 | */ |
1d52bdf7 CB |
23 | |
24 | #define _GNU_SOURCE | |
d06245b8 NC |
25 | #include "config.h" |
26 | ||
8f3e280e CB |
27 | #include <dirent.h> |
28 | #include <errno.h> | |
29 | #include <fcntl.h> | |
30 | #include <grp.h> | |
31 | #include <inttypes.h> | |
32 | #include <libgen.h> | |
33 | #include <pwd.h> | |
34 | #include <stdarg.h> | |
0ad19a3f | 35 | #include <stdio.h> |
0ad19a3f | 36 | #include <stdlib.h> |
0ad19a3f | 37 | #include <string.h> |
8f3e280e | 38 | #include <time.h> |
0ad19a3f | 39 | #include <unistd.h> |
8f3e280e CB |
40 | #include <arpa/inet.h> |
41 | #include <linux/loop.h> | |
8f3e280e CB |
42 | #include <net/if.h> |
43 | #include <netinet/in.h> | |
44 | #include <sys/mman.h> | |
45 | #include <sys/mount.h> | |
46 | #include <sys/param.h> | |
47 | #include <sys/prctl.h> | |
48 | #include <sys/stat.h> | |
49 | #include <sys/socket.h> | |
ce831b3b | 50 | #include <sys/sysmacros.h> |
2d76d1d7 | 51 | #include <sys/syscall.h> |
97e9cfa0 | 52 | #include <sys/types.h> |
8f3e280e CB |
53 | #include <sys/utsname.h> |
54 | #include <sys/wait.h> | |
1d52bdf7 | 55 | |
af6824fc ST |
56 | /* makedev() */ |
57 | #ifdef MAJOR_IN_MKDEV | |
58 | # include <sys/mkdev.h> | |
59 | #endif | |
af6824fc | 60 | |
614305f3 | 61 | #ifdef HAVE_STATVFS |
2938f7c8 | 62 | #include <sys/statvfs.h> |
614305f3 | 63 | #endif |
e827ff7e SG |
64 | |
65 | #if HAVE_PTY_H | |
b0a33c1e | 66 | #include <pty.h> |
e827ff7e SG |
67 | #else |
68 | #include <../include/openpty.h> | |
69 | #endif | |
0ad19a3f | 70 | |
e8bd4e43 | 71 | #include "af_unix.h" |
8f3e280e CB |
72 | #include "caps.h" /* for lxc_caps_last_cap() */ |
73 | #include "cgroup.h" | |
1b09f2c0 | 74 | #include "conf.h" |
1ed6ba91 | 75 | #include "confile_utils.h" |
e98affda | 76 | #include "console.h" |
8f3e280e | 77 | #include "error.h" |
1b09f2c0 | 78 | #include "log.h" |
025ed0f3 | 79 | #include "lxclock.h" |
8f3e280e | 80 | #include "lxcseccomp.h" |
4355ab5f | 81 | #include "namespace.h" |
8f3e280e CB |
82 | #include "network.h" |
83 | #include "parse.h" | |
732375f5 | 84 | #include "ringbuf.h" |
28d832c4 CB |
85 | #include "storage.h" |
86 | #include "storage/aufs.h" | |
87 | #include "storage/overlay.h" | |
8f3e280e | 88 | #include "utils.h" |
fe4de9a6 | 89 | #include "lsm/lsm.h" |
d0a36f2c | 90 | |
e37dda71 | 91 | #if HAVE_LIBCAP |
495d2046 SG |
92 | #include <sys/capability.h> |
93 | #endif | |
94 | ||
6ff05e18 SG |
95 | #if HAVE_SYS_PERSONALITY_H |
96 | #include <sys/personality.h> | |
97 | #endif | |
98 | ||
edaf8b1b SG |
99 | #if IS_BIONIC |
100 | #include <../include/lxcmntent.h> | |
101 | #else | |
102 | #include <mntent.h> | |
103 | #endif | |
104 | ||
f48b5fd8 FF |
105 | #if !defined(HAVE_PRLIMIT) && defined(HAVE_PRLIMIT64) |
106 | #include <../include/prlimit.h> | |
107 | #endif | |
108 | ||
36eb9bde | 109 | lxc_log_define(lxc_conf, lxc); |
e5bda9ee | 110 | |
2d76d1d7 SG |
111 | /* Define pivot_root() if missing from the C library */ |
112 | #ifndef HAVE_PIVOT_ROOT | |
113 | static int pivot_root(const char * new_root, const char * put_old) | |
114 | { | |
115 | #ifdef __NR_pivot_root | |
8f3e280e | 116 | return syscall(__NR_pivot_root, new_root, put_old); |
2d76d1d7 | 117 | #else |
8f3e280e CB |
118 | errno = ENOSYS; |
119 | return -1; | |
2d76d1d7 SG |
120 | #endif |
121 | } | |
122 | #else | |
123 | extern int pivot_root(const char * new_root, const char * put_old); | |
124 | #endif | |
125 | ||
ecec0126 SG |
126 | #ifndef MS_PRIVATE |
127 | #define MS_PRIVATE (1<<18) | |
128 | #endif | |
129 | ||
8912711c CB |
130 | #ifndef MS_LAZYTIME |
131 | #define MS_LAZYTIME (1<<25) | |
132 | #endif | |
133 | ||
2b9ae35a CB |
134 | char *lxchook_names[NUM_LXC_HOOKS] = {"pre-start", "pre-mount", "mount", |
135 | "autodev", "start", "stop", | |
08dd2805 SH |
136 | "post-stop", "clone", "destroy", |
137 | "start-host"}; | |
72d0e1cb | 138 | |
998ac676 RT |
139 | struct mount_opt { |
140 | char *name; | |
141 | int clear; | |
142 | int flag; | |
143 | }; | |
144 | ||
81810dd1 DL |
145 | struct caps_opt { |
146 | char *name; | |
147 | int value; | |
148 | }; | |
149 | ||
c6d09e15 WB |
150 | struct limit_opt { |
151 | char *name; | |
152 | int value; | |
153 | }; | |
154 | ||
858377e4 SH |
155 | /* |
156 | * The lxc_conf of the container currently being worked on in an | |
157 | * API call | |
158 | * This is used in the error calls | |
159 | */ | |
160 | #ifdef HAVE_TLS | |
161 | __thread struct lxc_conf *current_config; | |
162 | #else | |
163 | struct lxc_conf *current_config; | |
164 | #endif | |
165 | ||
998ac676 | 166 | static struct mount_opt mount_opt[] = { |
470b359b CB |
167 | { "async", 1, MS_SYNCHRONOUS }, |
168 | { "atime", 1, MS_NOATIME }, | |
169 | { "bind", 0, MS_BIND }, | |
88d413d5 | 170 | { "defaults", 0, 0 }, |
88d413d5 | 171 | { "dev", 1, MS_NODEV }, |
470b359b | 172 | { "diratime", 1, MS_NODIRATIME }, |
88d413d5 | 173 | { "dirsync", 0, MS_DIRSYNC }, |
470b359b | 174 | { "exec", 1, MS_NOEXEC }, |
8912711c | 175 | { "lazytime", 0, MS_LAZYTIME }, |
88d413d5 | 176 | { "mand", 0, MS_MANDLOCK }, |
88d413d5 | 177 | { "noatime", 0, MS_NOATIME }, |
470b359b | 178 | { "nodev", 0, MS_NODEV }, |
88d413d5 | 179 | { "nodiratime", 0, MS_NODIRATIME }, |
470b359b CB |
180 | { "noexec", 0, MS_NOEXEC }, |
181 | { "nomand", 1, MS_MANDLOCK }, | |
182 | { "norelatime", 1, MS_RELATIME }, | |
183 | { "nostrictatime", 1, MS_STRICTATIME }, | |
184 | { "nosuid", 0, MS_NOSUID }, | |
88d413d5 SW |
185 | { "rbind", 0, MS_BIND|MS_REC }, |
186 | { "relatime", 0, MS_RELATIME }, | |
470b359b CB |
187 | { "remount", 0, MS_REMOUNT }, |
188 | { "ro", 0, MS_RDONLY }, | |
189 | { "rw", 1, MS_RDONLY }, | |
88d413d5 | 190 | { "strictatime", 0, MS_STRICTATIME }, |
470b359b CB |
191 | { "suid", 1, MS_NOSUID }, |
192 | { "sync", 0, MS_SYNCHRONOUS }, | |
88d413d5 | 193 | { NULL, 0, 0 }, |
998ac676 RT |
194 | }; |
195 | ||
e37dda71 | 196 | #if HAVE_LIBCAP |
81810dd1 | 197 | static struct caps_opt caps_opt[] = { |
a6afdde9 | 198 | { "chown", CAP_CHOWN }, |
1e11be34 DL |
199 | { "dac_override", CAP_DAC_OVERRIDE }, |
200 | { "dac_read_search", CAP_DAC_READ_SEARCH }, | |
201 | { "fowner", CAP_FOWNER }, | |
202 | { "fsetid", CAP_FSETID }, | |
81810dd1 DL |
203 | { "kill", CAP_KILL }, |
204 | { "setgid", CAP_SETGID }, | |
205 | { "setuid", CAP_SETUID }, | |
206 | { "setpcap", CAP_SETPCAP }, | |
207 | { "linux_immutable", CAP_LINUX_IMMUTABLE }, | |
208 | { "net_bind_service", CAP_NET_BIND_SERVICE }, | |
209 | { "net_broadcast", CAP_NET_BROADCAST }, | |
210 | { "net_admin", CAP_NET_ADMIN }, | |
211 | { "net_raw", CAP_NET_RAW }, | |
212 | { "ipc_lock", CAP_IPC_LOCK }, | |
213 | { "ipc_owner", CAP_IPC_OWNER }, | |
214 | { "sys_module", CAP_SYS_MODULE }, | |
215 | { "sys_rawio", CAP_SYS_RAWIO }, | |
216 | { "sys_chroot", CAP_SYS_CHROOT }, | |
217 | { "sys_ptrace", CAP_SYS_PTRACE }, | |
218 | { "sys_pacct", CAP_SYS_PACCT }, | |
219 | { "sys_admin", CAP_SYS_ADMIN }, | |
220 | { "sys_boot", CAP_SYS_BOOT }, | |
221 | { "sys_nice", CAP_SYS_NICE }, | |
222 | { "sys_resource", CAP_SYS_RESOURCE }, | |
223 | { "sys_time", CAP_SYS_TIME }, | |
224 | { "sys_tty_config", CAP_SYS_TTY_CONFIG }, | |
225 | { "mknod", CAP_MKNOD }, | |
226 | { "lease", CAP_LEASE }, | |
57b837e2 CB |
227 | #ifdef CAP_AUDIT_READ |
228 | { "audit_read", CAP_AUDIT_READ }, | |
229 | #endif | |
9527e566 | 230 | #ifdef CAP_AUDIT_WRITE |
81810dd1 | 231 | { "audit_write", CAP_AUDIT_WRITE }, |
9527e566 FW |
232 | #endif |
233 | #ifdef CAP_AUDIT_CONTROL | |
81810dd1 | 234 | { "audit_control", CAP_AUDIT_CONTROL }, |
9527e566 | 235 | #endif |
81810dd1 DL |
236 | { "setfcap", CAP_SETFCAP }, |
237 | { "mac_override", CAP_MAC_OVERRIDE }, | |
238 | { "mac_admin", CAP_MAC_ADMIN }, | |
5170c716 CS |
239 | #ifdef CAP_SYSLOG |
240 | { "syslog", CAP_SYSLOG }, | |
241 | #endif | |
242 | #ifdef CAP_WAKE_ALARM | |
243 | { "wake_alarm", CAP_WAKE_ALARM }, | |
244 | #endif | |
2b54359b CB |
245 | #ifdef CAP_BLOCK_SUSPEND |
246 | { "block_suspend", CAP_BLOCK_SUSPEND }, | |
247 | #endif | |
81810dd1 | 248 | }; |
495d2046 SG |
249 | #else |
250 | static struct caps_opt caps_opt[] = {}; | |
251 | #endif | |
81810dd1 | 252 | |
c6d09e15 WB |
253 | static struct limit_opt limit_opt[] = { |
254 | #ifdef RLIMIT_AS | |
255 | { "as", RLIMIT_AS }, | |
256 | #endif | |
257 | #ifdef RLIMIT_CORE | |
258 | { "core", RLIMIT_CORE }, | |
259 | #endif | |
260 | #ifdef RLIMIT_CPU | |
261 | { "cpu", RLIMIT_CPU }, | |
262 | #endif | |
263 | #ifdef RLIMIT_DATA | |
264 | { "data", RLIMIT_DATA }, | |
265 | #endif | |
266 | #ifdef RLIMIT_FSIZE | |
267 | { "fsize", RLIMIT_FSIZE }, | |
268 | #endif | |
269 | #ifdef RLIMIT_LOCKS | |
270 | { "locks", RLIMIT_LOCKS }, | |
271 | #endif | |
272 | #ifdef RLIMIT_MEMLOCK | |
273 | { "memlock", RLIMIT_MEMLOCK }, | |
274 | #endif | |
275 | #ifdef RLIMIT_MSGQUEUE | |
276 | { "msgqueue", RLIMIT_MSGQUEUE }, | |
277 | #endif | |
278 | #ifdef RLIMIT_NICE | |
279 | { "nice", RLIMIT_NICE }, | |
280 | #endif | |
281 | #ifdef RLIMIT_NOFILE | |
282 | { "nofile", RLIMIT_NOFILE }, | |
283 | #endif | |
284 | #ifdef RLIMIT_NPROC | |
285 | { "nproc", RLIMIT_NPROC }, | |
286 | #endif | |
287 | #ifdef RLIMIT_RSS | |
288 | { "rss", RLIMIT_RSS }, | |
289 | #endif | |
290 | #ifdef RLIMIT_RTPRIO | |
291 | { "rtprio", RLIMIT_RTPRIO }, | |
292 | #endif | |
293 | #ifdef RLIMIT_RTTIME | |
294 | { "rttime", RLIMIT_RTTIME }, | |
295 | #endif | |
296 | #ifdef RLIMIT_SIGPENDING | |
297 | { "sigpending", RLIMIT_SIGPENDING }, | |
298 | #endif | |
299 | #ifdef RLIMIT_STACK | |
300 | { "stack", RLIMIT_STACK }, | |
301 | #endif | |
302 | }; | |
303 | ||
91c3830e SH |
304 | static int run_buffer(char *buffer) |
305 | { | |
ebec9176 | 306 | struct lxc_popen_FILE *f; |
91c3830e | 307 | char *output; |
8e7da691 | 308 | int ret; |
91c3830e | 309 | |
ebec9176 | 310 | f = lxc_popen(buffer); |
91c3830e | 311 | if (!f) { |
3f60c2f7 | 312 | SYSERROR("Failed to popen() %s", buffer); |
91c3830e SH |
313 | return -1; |
314 | } | |
315 | ||
316 | output = malloc(LXC_LOG_BUFFER_SIZE); | |
317 | if (!output) { | |
3f60c2f7 | 318 | ERROR("Failed to allocate memory for %s", buffer); |
ebec9176 | 319 | lxc_pclose(f); |
91c3830e SH |
320 | return -1; |
321 | } | |
322 | ||
062b72c6 | 323 | while (fgets(output, LXC_LOG_BUFFER_SIZE, f->f)) |
3f60c2f7 | 324 | DEBUG("Script %s with output: %s", buffer, output); |
91c3830e SH |
325 | |
326 | free(output); | |
327 | ||
ebec9176 | 328 | ret = lxc_pclose(f); |
8e7da691 | 329 | if (ret == -1) { |
3f60c2f7 | 330 | SYSERROR("Script exited with error"); |
91c3830e | 331 | return -1; |
8e7da691 | 332 | } else if (WIFEXITED(ret) && WEXITSTATUS(ret) != 0) { |
3f60c2f7 | 333 | ERROR("Script exited with status %d", WEXITSTATUS(ret)); |
8e7da691 DE |
334 | return -1; |
335 | } else if (WIFSIGNALED(ret)) { | |
3f60c2f7 | 336 | ERROR("Script terminated by signal %d", WTERMSIG(ret)); |
8e7da691 | 337 | return -1; |
91c3830e SH |
338 | } |
339 | ||
340 | return 0; | |
341 | } | |
342 | ||
14a7b0f9 CB |
343 | int run_script_argv(const char *name, unsigned int hook_version, |
344 | const char *section, const char *script, | |
345 | const char *hookname, char **argsin) | |
148e91f5 | 346 | { |
3f60c2f7 | 347 | int buf_pos, i, ret; |
148e91f5 | 348 | char *buffer; |
d08e5708 | 349 | size_t size = 0; |
148e91f5 | 350 | |
3f60c2f7 CB |
351 | if (hook_version == 0) |
352 | INFO("Executing script \"%s\" for container \"%s\", config " | |
353 | "section \"%s\"", script, name, section); | |
354 | else | |
355 | INFO("Executing script \"%s\" for container \"%s\"", script, name); | |
148e91f5 | 356 | |
062b72c6 | 357 | for (i = 0; argsin && argsin[i]; i++) |
148e91f5 SH |
358 | size += strlen(argsin[i]) + 1; |
359 | ||
3f60c2f7 | 360 | size += sizeof("exec"); |
148e91f5 | 361 | size += strlen(script); |
3f60c2f7 CB |
362 | size++; |
363 | ||
148e91f5 | 364 | if (size > INT_MAX) |
3f60c2f7 | 365 | return -EFBIG; |
148e91f5 SH |
366 | |
367 | buffer = alloca(size); | |
148e91f5 | 368 | |
3f60c2f7 | 369 | if (hook_version == 0) { |
d08e5708 CB |
370 | size += strlen(hookname); |
371 | size++; | |
372 | ||
373 | size += strlen(name); | |
374 | size++; | |
375 | ||
376 | size += strlen(section); | |
377 | size++; | |
378 | ||
379 | if (size > INT_MAX) | |
380 | return -EFBIG; | |
3f60c2f7 CB |
381 | |
382 | buf_pos = snprintf(buffer, size, "exec %s %s %s %s", script, name, section, hookname); | |
383 | if (buf_pos < 0 || (size_t)buf_pos >= size) { | |
384 | ERROR("Failed to create command line for script \"%s\"", script); | |
385 | return -1; | |
386 | } | |
387 | } else { | |
388 | buf_pos = snprintf(buffer, size, "exec %s", script); | |
389 | if (buf_pos < 0 || (size_t)buf_pos >= size) { | |
390 | ERROR("Failed to create command line for script \"%s\"", script); | |
391 | return -1; | |
392 | } | |
393 | ||
394 | ret = setenv("LXC_HOOK_TYPE", hookname, 1); | |
395 | if (ret < 0) { | |
396 | SYSERROR("Failed to set environment variable: " | |
397 | "LXC_HOOK_TYPE=%s", hookname); | |
398 | return -1; | |
399 | } | |
400 | TRACE("Set environment variable: LXC_HOOK_TYPE=%s", section); | |
401 | ||
402 | ret = setenv("LXC_HOOK_SECTION", section, 1); | |
403 | if (ret < 0) { | |
404 | SYSERROR("Failed to set environment variable: " | |
405 | "LXC_HOOK_SECTION=%s", section); | |
406 | return -1; | |
407 | } | |
408 | TRACE("Set environment variable: LXC_HOOK_SECTION=%s", section); | |
14a7b0f9 CB |
409 | |
410 | if (strcmp(section, "net") == 0) { | |
411 | char *parent; | |
412 | ||
413 | if (!argsin[0]) | |
414 | return -EINVAL; | |
415 | ||
416 | ret = setenv("LXC_NET_TYPE", argsin[0], 1); | |
417 | if (ret < 0) { | |
418 | SYSERROR("Failed to set environment variable: " | |
419 | "LXC_NET_TYPE=%s", argsin[0]); | |
420 | return -1; | |
421 | } | |
422 | TRACE("Set environment variable: LXC_NET_TYPE=%s", argsin[0]); | |
423 | ||
424 | parent = argsin[1] ? argsin[1] : ""; | |
425 | ||
426 | if (strcmp(argsin[0], "macvlan")) { | |
427 | ret = setenv("LXC_NET_PARENT", parent, 1); | |
428 | if (ret < 0) { | |
429 | SYSERROR("Failed to set environment " | |
430 | "variable: LXC_NET_PARENT=%s", parent); | |
431 | return -1; | |
432 | } | |
433 | TRACE("Set environment variable: LXC_NET_PARENT=%s", parent); | |
434 | } else if (strcmp(argsin[0], "phys")) { | |
435 | ret = setenv("LXC_NET_PARENT", parent, 1); | |
436 | if (ret < 0) { | |
437 | SYSERROR("Failed to set environment " | |
438 | "variable: LXC_NET_PARENT=%s", parent); | |
439 | return -1; | |
440 | } | |
441 | TRACE("Set environment variable: LXC_NET_PARENT=%s", parent); | |
442 | } else if (strcmp(argsin[0], "veth")) { | |
443 | char *peer = argsin[2] ? argsin[2] : ""; | |
444 | ||
445 | ret = setenv("LXC_NET_PEER", peer, 1); | |
446 | if (ret < 0) { | |
447 | SYSERROR("Failed to set environment " | |
448 | "variable: LXC_NET_PEER=%s", peer); | |
449 | return -1; | |
450 | } | |
451 | TRACE("Set environment variable: LXC_NET_PEER=%s", peer); | |
452 | ||
453 | ret = setenv("LXC_NET_PARENT", parent, 1); | |
454 | if (ret < 0) { | |
455 | SYSERROR("Failed to set environment " | |
456 | "variable: LXC_NET_PARENT=%s", parent); | |
457 | return -1; | |
458 | } | |
459 | TRACE("Set environment variable: LXC_NET_PARENT=%s", parent); | |
460 | } | |
461 | } | |
148e91f5 SH |
462 | } |
463 | ||
062b72c6 | 464 | for (i = 0; argsin && argsin[i]; i++) { |
3f60c2f7 CB |
465 | size_t len = size - buf_pos; |
466 | ||
467 | ret = snprintf(buffer + buf_pos, len, " %s", argsin[i]); | |
468 | if (ret < 0 || (size_t)ret >= len) { | |
469 | ERROR("Failed to create command line for script \"%s\"", script); | |
148e91f5 SH |
470 | return -1; |
471 | } | |
3f60c2f7 | 472 | buf_pos += ret; |
148e91f5 SH |
473 | } |
474 | ||
475 | return run_buffer(buffer); | |
476 | } | |
477 | ||
811ef482 | 478 | int run_script(const char *name, const char *section, const char *script, ...) |
e3b4c4c4 | 479 | { |
abbfd20b | 480 | int ret; |
91c3830e | 481 | char *buffer, *p; |
abbfd20b DL |
482 | size_t size = 0; |
483 | va_list ap; | |
751d9dcd | 484 | |
062b72c6 | 485 | INFO("Executing script \"%s\" for container \"%s\", config section \"%s\".", |
751d9dcd | 486 | script, name, section); |
e3b4c4c4 | 487 | |
abbfd20b DL |
488 | va_start(ap, script); |
489 | while ((p = va_arg(ap, char *))) | |
95642a10 | 490 | size += strlen(p) + 1; |
abbfd20b DL |
491 | va_end(ap); |
492 | ||
6d1a5f93 | 493 | size += strlen("exec"); |
abbfd20b DL |
494 | size += strlen(script); |
495 | size += strlen(name); | |
496 | size += strlen(section); | |
6d1a5f93 | 497 | size += 4; |
abbfd20b | 498 | |
95642a10 MS |
499 | if (size > INT_MAX) |
500 | return -1; | |
501 | ||
502 | buffer = alloca(size); | |
abbfd20b | 503 | if (!buffer) { |
062b72c6 | 504 | ERROR("Failed to allocate memory."); |
751d9dcd DL |
505 | return -1; |
506 | } | |
507 | ||
6d1a5f93 | 508 | ret = snprintf(buffer, size, "exec %s %s %s", script, name, section); |
9ba8130c | 509 | if (ret < 0 || ret >= size) { |
062b72c6 | 510 | ERROR("Script name too long."); |
9ba8130c SH |
511 | return -1; |
512 | } | |
751d9dcd | 513 | |
abbfd20b | 514 | va_start(ap, script); |
9ba8130c | 515 | while ((p = va_arg(ap, char *))) { |
062b72c6 | 516 | int len = size - ret; |
9ba8130c SH |
517 | int rc; |
518 | rc = snprintf(buffer + ret, len, " %s", p); | |
519 | if (rc < 0 || rc >= len) { | |
062b72c6 | 520 | ERROR("Script args too long."); |
9ba8130c SH |
521 | return -1; |
522 | } | |
523 | ret += rc; | |
524 | } | |
abbfd20b | 525 | va_end(ap); |
751d9dcd | 526 | |
91c3830e | 527 | return run_buffer(buffer); |
e3b4c4c4 ST |
528 | } |
529 | ||
0c547523 SH |
530 | /* |
531 | * pin_rootfs | |
b7ed4bf0 CS |
532 | * if rootfs is a directory, then open ${rootfs}/lxc.hold for writing for |
533 | * the duration of the container run, to prevent the container from marking | |
534 | * the underlying fs readonly on shutdown. unlink the file immediately so | |
535 | * no name pollution is happens | |
0c547523 SH |
536 | * return -1 on error. |
537 | * return -2 if nothing needed to be pinned. | |
538 | * return an open fd (>=0) if we pinned it. | |
539 | */ | |
540 | int pin_rootfs(const char *rootfs) | |
541 | { | |
542 | char absrootfs[MAXPATHLEN]; | |
543 | char absrootfspin[MAXPATHLEN]; | |
544 | struct stat s; | |
545 | int ret, fd; | |
546 | ||
e99ee0de | 547 | if (rootfs == NULL || strlen(rootfs) == 0) |
0d03360a | 548 | return -2; |
e99ee0de | 549 | |
00ec333b | 550 | if (!realpath(rootfs, absrootfs)) |
9be53773 | 551 | return -2; |
0c547523 | 552 | |
00ec333b | 553 | if (access(absrootfs, F_OK)) |
0c547523 | 554 | return -1; |
0c547523 | 555 | |
00ec333b | 556 | if (stat(absrootfs, &s)) |
0c547523 | 557 | return -1; |
0c547523 | 558 | |
72f919c4 | 559 | if (!S_ISDIR(s.st_mode)) |
0c547523 SH |
560 | return -2; |
561 | ||
b7ed4bf0 | 562 | ret = snprintf(absrootfspin, MAXPATHLEN, "%s/lxc.hold", absrootfs); |
00ec333b | 563 | if (ret >= MAXPATHLEN) |
0c547523 | 564 | return -1; |
0c547523 SH |
565 | |
566 | fd = open(absrootfspin, O_CREAT | O_RDWR, S_IWUSR|S_IRUSR); | |
b7ed4bf0 CS |
567 | if (fd < 0) |
568 | return fd; | |
569 | (void)unlink(absrootfspin); | |
0c547523 SH |
570 | return fd; |
571 | } | |
572 | ||
e2a7e8dc SH |
573 | /* |
574 | * If we are asking to remount something, make sure that any | |
575 | * NOEXEC etc are honored. | |
576 | */ | |
5ae72b98 | 577 | unsigned long add_required_remount_flags(const char *s, const char *d, |
e2a7e8dc SH |
578 | unsigned long flags) |
579 | { | |
614305f3 | 580 | #ifdef HAVE_STATVFS |
e2a7e8dc SH |
581 | struct statvfs sb; |
582 | unsigned long required_flags = 0; | |
583 | ||
584 | if (!(flags & MS_REMOUNT)) | |
585 | return flags; | |
586 | ||
587 | if (!s) | |
588 | s = d; | |
589 | ||
590 | if (!s) | |
591 | return flags; | |
592 | if (statvfs(s, &sb) < 0) | |
593 | return flags; | |
594 | ||
595 | if (sb.f_flag & MS_NOSUID) | |
596 | required_flags |= MS_NOSUID; | |
597 | if (sb.f_flag & MS_NODEV) | |
598 | required_flags |= MS_NODEV; | |
599 | if (sb.f_flag & MS_RDONLY) | |
600 | required_flags |= MS_RDONLY; | |
601 | if (sb.f_flag & MS_NOEXEC) | |
602 | required_flags |= MS_NOEXEC; | |
603 | ||
604 | return flags | required_flags; | |
614305f3 SH |
605 | #else |
606 | return flags; | |
607 | #endif | |
e2a7e8dc SH |
608 | } |
609 | ||
4fb3cba5 | 610 | static int lxc_mount_auto_mounts(struct lxc_conf *conf, int flags, struct lxc_handler *handler) |
368bbc02 | 611 | { |
368bbc02 | 612 | int r; |
80e80c40 | 613 | int i; |
b06b8511 CS |
614 | static struct { |
615 | int match_mask; | |
616 | int match_flag; | |
617 | const char *source; | |
618 | const char *destination; | |
619 | const char *fstype; | |
620 | unsigned long flags; | |
621 | const char *options; | |
622 | } default_mounts[] = { | |
623 | /* Read-only bind-mounting... In older kernels, doing that required | |
624 | * to do one MS_BIND mount and then MS_REMOUNT|MS_RDONLY the same | |
625 | * one. According to mount(2) manpage, MS_BIND honors MS_RDONLY from | |
626 | * kernel 2.6.26 onwards. However, this apparently does not work on | |
627 | * kernel 3.8. Unfortunately, on that very same kernel, doing the | |
628 | * same trick as above doesn't seem to work either, there one needs | |
629 | * to ALSO specify MS_BIND for the remount, otherwise the entire | |
630 | * fs is remounted read-only or the mount fails because it's busy... | |
631 | * MS_REMOUNT|MS_BIND|MS_RDONLY seems to work for kernels as low as | |
632 | * 2.6.32... | |
368bbc02 | 633 | */ |
f24a52d5 | 634 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, |
592fd47a SH |
635 | /* proc/tty is used as a temporary placeholder for proc/sys/net which we'll move back in a few steps */ |
636 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sys/net", "%r/proc/tty", NULL, MS_BIND, NULL }, | |
f24a52d5 SG |
637 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sys", "%r/proc/sys", NULL, MS_BIND, NULL }, |
638 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sys", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
592fd47a | 639 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/tty", "%r/proc/sys/net", NULL, MS_MOVE, NULL }, |
f24a52d5 SG |
640 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, "%r/proc/sysrq-trigger", "%r/proc/sysrq-trigger", NULL, MS_BIND, NULL }, |
641 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_MIXED, NULL, "%r/proc/sysrq-trigger", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
642 | { LXC_AUTO_PROC_MASK, LXC_AUTO_PROC_RW, "proc", "%r/proc", "proc", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, | |
643 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RW, "sysfs", "%r/sys", "sysfs", 0, NULL }, | |
644 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_RO, "sysfs", "%r/sys", "sysfs", MS_RDONLY, NULL }, | |
645 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "sysfs", "%r/sys", "sysfs", MS_NODEV|MS_NOEXEC|MS_NOSUID, NULL }, | |
646 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "%r/sys", "%r/sys", NULL, MS_BIND, NULL }, | |
647 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, NULL, "%r/sys", NULL, MS_REMOUNT|MS_BIND|MS_RDONLY, NULL }, | |
648 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "sysfs", "%r/sys/devices/virtual/net", "sysfs", 0, NULL }, | |
649 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, "%r/sys/devices/virtual/net/devices/virtual/net", "%r/sys/devices/virtual/net", NULL, MS_BIND, NULL }, | |
650 | { LXC_AUTO_SYS_MASK, LXC_AUTO_SYS_MIXED, NULL, "%r/sys/devices/virtual/net", NULL, MS_REMOUNT|MS_BIND|MS_NOSUID|MS_NODEV|MS_NOEXEC, NULL }, | |
651 | { 0, 0, NULL, NULL, NULL, 0, NULL } | |
b06b8511 | 652 | }; |
368bbc02 | 653 | |
b06b8511 CS |
654 | for (i = 0; default_mounts[i].match_mask; i++) { |
655 | if ((flags & default_mounts[i].match_mask) == default_mounts[i].match_flag) { | |
656 | char *source = NULL; | |
657 | char *destination = NULL; | |
658 | int saved_errno; | |
e2a7e8dc | 659 | unsigned long mflags; |
b06b8511 CS |
660 | |
661 | if (default_mounts[i].source) { | |
662 | /* will act like strdup if %r is not present */ | |
8ede5f4c | 663 | source = lxc_string_replace("%r", conf->rootfs.path ? conf->rootfs.mount : "", default_mounts[i].source); |
b06b8511 CS |
664 | if (!source) { |
665 | SYSERROR("memory allocation error"); | |
666 | return -1; | |
667 | } | |
668 | } | |
cc4fd506 SH |
669 | if (!default_mounts[i].destination) { |
670 | ERROR("BUG: auto mounts destination %d was NULL", i); | |
b2f44b4d | 671 | free(source); |
cc4fd506 SH |
672 | return -1; |
673 | } | |
674 | /* will act like strdup if %r is not present */ | |
675 | destination = lxc_string_replace("%r", conf->rootfs.path ? conf->rootfs.mount : "", default_mounts[i].destination); | |
676 | if (!destination) { | |
677 | saved_errno = errno; | |
678 | SYSERROR("memory allocation error"); | |
679 | free(source); | |
680 | errno = saved_errno; | |
681 | return -1; | |
b06b8511 | 682 | } |
e2a7e8dc SH |
683 | mflags = add_required_remount_flags(source, destination, |
684 | default_mounts[i].flags); | |
592fd47a | 685 | r = safe_mount(source, destination, default_mounts[i].fstype, mflags, default_mounts[i].options, conf->rootfs.path ? conf->rootfs.mount : NULL); |
b06b8511 | 686 | saved_errno = errno; |
b88ff9a0 SG |
687 | if (r < 0 && errno == ENOENT) { |
688 | INFO("Mount source or target for %s on %s doesn't exist. Skipping.", source, destination); | |
689 | r = 0; | |
690 | } | |
691 | else if (r < 0) | |
e2a7e8dc | 692 | SYSERROR("error mounting %s on %s flags %lu", source, destination, mflags); |
f24a52d5 | 693 | |
b06b8511 CS |
694 | free(source); |
695 | free(destination); | |
696 | if (r < 0) { | |
b06b8511 CS |
697 | errno = saved_errno; |
698 | return -1; | |
699 | } | |
368bbc02 | 700 | } |
368bbc02 CS |
701 | } |
702 | ||
b06b8511 | 703 | if (flags & LXC_AUTO_CGROUP_MASK) { |
0769b82a CS |
704 | int cg_flags; |
705 | ||
706 | cg_flags = flags & LXC_AUTO_CGROUP_MASK; | |
707 | /* If the type of cgroup mount was not specified, it depends on the | |
708 | * container's capabilities as to what makes sense: if we have | |
709 | * CAP_SYS_ADMIN, the read-only part can be remounted read-write | |
710 | * anyway, so we may as well default to read-write; then the admin | |
711 | * will not be given a false sense of security. (And if they really | |
712 | * want mixed r/o r/w, then they can explicitly specify :mixed.) | |
713 | * OTOH, if the container lacks CAP_SYS_ADMIN, do only default to | |
714 | * :mixed, because then the container can't remount it read-write. */ | |
715 | if (cg_flags == LXC_AUTO_CGROUP_NOSPEC || cg_flags == LXC_AUTO_CGROUP_FULL_NOSPEC) { | |
716 | int has_sys_admin = 0; | |
b0ee5983 CB |
717 | |
718 | if (!lxc_list_empty(&conf->keepcaps)) | |
0769b82a | 719 | has_sys_admin = in_caplist(CAP_SYS_ADMIN, &conf->keepcaps); |
b0ee5983 | 720 | else |
0769b82a | 721 | has_sys_admin = !in_caplist(CAP_SYS_ADMIN, &conf->caps); |
b0ee5983 CB |
722 | |
723 | if (cg_flags == LXC_AUTO_CGROUP_NOSPEC) | |
0769b82a | 724 | cg_flags = has_sys_admin ? LXC_AUTO_CGROUP_RW : LXC_AUTO_CGROUP_MIXED; |
b0ee5983 | 725 | else |
0769b82a | 726 | cg_flags = has_sys_admin ? LXC_AUTO_CGROUP_FULL_RW : LXC_AUTO_CGROUP_FULL_MIXED; |
0769b82a CS |
727 | } |
728 | ||
8ede5f4c | 729 | if (!cgroup_mount(conf->rootfs.path ? conf->rootfs.mount : "", handler, cg_flags)) { |
368bbc02 | 730 | SYSERROR("error mounting /sys/fs/cgroup"); |
b06b8511 | 731 | return -1; |
368bbc02 CS |
732 | } |
733 | } | |
734 | ||
368bbc02 | 735 | return 0; |
368bbc02 CS |
736 | } |
737 | ||
4e5440c6 | 738 | static int setup_utsname(struct utsname *utsname) |
0ad19a3f | 739 | { |
4e5440c6 DL |
740 | if (!utsname) |
741 | return 0; | |
0ad19a3f | 742 | |
4e5440c6 DL |
743 | if (sethostname(utsname->nodename, strlen(utsname->nodename))) { |
744 | SYSERROR("failed to set the hostname to '%s'", utsname->nodename); | |
0ad19a3f | 745 | return -1; |
746 | } | |
747 | ||
4e5440c6 | 748 | INFO("'%s' hostname has been setup", utsname->nodename); |
cd54d859 | 749 | |
0ad19a3f | 750 | return 0; |
751 | } | |
752 | ||
69aa6655 DE |
753 | struct dev_symlinks { |
754 | const char *oldpath; | |
755 | const char *name; | |
756 | }; | |
757 | ||
758 | static const struct dev_symlinks dev_symlinks[] = { | |
759 | {"/proc/self/fd", "fd"}, | |
760 | {"/proc/self/fd/0", "stdin"}, | |
761 | {"/proc/self/fd/1", "stdout"}, | |
762 | {"/proc/self/fd/2", "stderr"}, | |
763 | }; | |
764 | ||
ed8704d0 | 765 | static int lxc_setup_dev_symlinks(const struct lxc_rootfs *rootfs) |
69aa6655 DE |
766 | { |
767 | char path[MAXPATHLEN]; | |
768 | int ret,i; | |
09227be2 | 769 | struct stat s; |
69aa6655 DE |
770 | |
771 | ||
772 | for (i = 0; i < sizeof(dev_symlinks) / sizeof(dev_symlinks[0]); i++) { | |
773 | const struct dev_symlinks *d = &dev_symlinks[i]; | |
ec50007f | 774 | ret = snprintf(path, sizeof(path), "%s/dev/%s", rootfs->path ? rootfs->mount : "", d->name); |
69aa6655 DE |
775 | if (ret < 0 || ret >= MAXPATHLEN) |
776 | return -1; | |
09227be2 MW |
777 | |
778 | /* | |
779 | * Stat the path first. If we don't get an error | |
780 | * accept it as is and don't try to create it | |
781 | */ | |
782 | if (!stat(path, &s)) { | |
783 | continue; | |
784 | } | |
785 | ||
69aa6655 | 786 | ret = symlink(d->oldpath, path); |
09227be2 | 787 | |
69aa6655 | 788 | if (ret && errno != EEXIST) { |
09227be2 MW |
789 | if ( errno == EROFS ) { |
790 | WARN("Warning: Read Only file system while creating %s", path); | |
791 | } else { | |
792 | SYSERROR("Error creating %s", path); | |
793 | return -1; | |
794 | } | |
69aa6655 DE |
795 | } |
796 | } | |
797 | return 0; | |
798 | } | |
799 | ||
2187efd3 | 800 | /* Build a space-separate list of ptys to pass to systemd. */ |
393903d1 | 801 | static bool append_ptyname(char **pp, char *name) |
b0a33c1e | 802 | { |
393903d1 SH |
803 | char *p; |
804 | ||
805 | if (!*pp) { | |
806 | *pp = malloc(strlen(name) + strlen("container_ttys=") + 1); | |
807 | if (!*pp) | |
808 | return false; | |
809 | sprintf(*pp, "container_ttys=%s", name); | |
810 | return true; | |
811 | } | |
812 | p = realloc(*pp, strlen(*pp) + strlen(name) + 2); | |
813 | if (!p) | |
814 | return false; | |
815 | *pp = p; | |
816 | strcat(p, " "); | |
817 | strcat(p, name); | |
818 | return true; | |
819 | } | |
820 | ||
2187efd3 | 821 | static int lxc_setup_ttys(struct lxc_conf *conf) |
393903d1 | 822 | { |
9e1045e3 | 823 | int i, ret; |
393903d1 SH |
824 | const struct lxc_tty_info *tty_info = &conf->tty_info; |
825 | char *ttydir = conf->ttydir; | |
7c6ef2a2 | 826 | char path[MAXPATHLEN], lxcpath[MAXPATHLEN]; |
b0a33c1e | 827 | |
e8bd4e43 | 828 | if (!conf->rootfs.path) |
bc9bd0e3 DL |
829 | return 0; |
830 | ||
b0a33c1e | 831 | for (i = 0; i < tty_info->nbtty; i++) { |
b0a33c1e | 832 | struct lxc_pty_info *pty_info = &tty_info->pty_info[i]; |
833 | ||
e8bd4e43 | 834 | ret = snprintf(path, sizeof(path), "/dev/tty%d", i + 1); |
73363c61 | 835 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 836 | return -1; |
9e1045e3 | 837 | |
7c6ef2a2 SH |
838 | if (ttydir) { |
839 | /* create dev/lxc/tty%d" */ | |
9e1045e3 CB |
840 | ret = snprintf(lxcpath, sizeof(lxcpath), |
841 | "/dev/%s/tty%d", ttydir, i + 1); | |
73363c61 | 842 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) |
7c6ef2a2 | 843 | return -1; |
9e1045e3 | 844 | |
7c6ef2a2 | 845 | ret = creat(lxcpath, 0660); |
9e1045e3 | 846 | if (ret < 0 && errno != EEXIST) { |
73363c61 | 847 | SYSERROR("Failed to create \"%s\"", lxcpath); |
7c6ef2a2 SH |
848 | return -1; |
849 | } | |
4d44e274 SH |
850 | if (ret >= 0) |
851 | close(ret); | |
9e1045e3 | 852 | |
7c6ef2a2 | 853 | ret = unlink(path); |
9e1045e3 | 854 | if (ret < 0 && errno != ENOENT) { |
73363c61 | 855 | SYSERROR("Failed to unlink \"%s\"", path); |
7c6ef2a2 SH |
856 | return -1; |
857 | } | |
b0a33c1e | 858 | |
9e1045e3 CB |
859 | ret = mount(pty_info->name, lxcpath, "none", MS_BIND, 0); |
860 | if (ret < 0) { | |
73363c61 | 861 | WARN("Failed to bind mount \"%s\" onto \"%s\"", |
7c6ef2a2 SH |
862 | pty_info->name, path); |
863 | continue; | |
864 | } | |
9e1045e3 CB |
865 | DEBUG("bind mounted \"%s\" onto \"%s\"", pty_info->name, |
866 | path); | |
13954cce | 867 | |
9e1045e3 CB |
868 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/tty%d", |
869 | ttydir, i + 1); | |
73363c61 | 870 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) |
9ba8130c | 871 | return -1; |
9e1045e3 | 872 | |
7c6ef2a2 | 873 | ret = symlink(lxcpath, path); |
9e1045e3 | 874 | if (ret < 0) { |
73363c61 | 875 | SYSERROR("Failed to create symlink \"%s\" -> \"%s\"", |
9e1045e3 | 876 | path, lxcpath); |
7c6ef2a2 SH |
877 | return -1; |
878 | } | |
879 | } else { | |
9e1045e3 CB |
880 | /* If we populated /dev, then we need to create |
881 | * /dev/ttyN | |
882 | */ | |
883 | ret = access(path, F_OK); | |
884 | if (ret < 0) { | |
c6883f38 | 885 | ret = creat(path, 0660); |
9e1045e3 | 886 | if (ret < 0) { |
73363c61 | 887 | SYSERROR("Failed to create \"%s\"", path); |
c6883f38 | 888 | /* this isn't fatal, continue */ |
025ed0f3 | 889 | } else { |
c6883f38 | 890 | close(ret); |
025ed0f3 | 891 | } |
c6883f38 | 892 | } |
9e1045e3 CB |
893 | |
894 | ret = mount(pty_info->name, path, "none", MS_BIND, 0); | |
895 | if (ret < 0) { | |
73363c61 | 896 | SYSERROR("Failed to mount '%s'->'%s'", pty_info->name, path); |
7c6ef2a2 SH |
897 | continue; |
898 | } | |
9e1045e3 | 899 | |
73363c61 | 900 | DEBUG("Bind mounted \"%s\" onto \"%s\"", pty_info->name, |
9e1045e3 | 901 | path); |
393903d1 | 902 | } |
9e1045e3 | 903 | |
e8bd4e43 | 904 | if (!append_ptyname(&conf->pty_names, pty_info->name)) { |
393903d1 SH |
905 | ERROR("Error setting up container_ttys string"); |
906 | return -1; | |
b0a33c1e | 907 | } |
908 | } | |
909 | ||
73363c61 | 910 | INFO("Finished setting up %d /dev/tty<N> device(s)", tty_info->nbtty); |
b0a33c1e | 911 | return 0; |
912 | } | |
913 | ||
2187efd3 CB |
914 | int lxc_allocate_ttys(const char *name, struct lxc_conf *conf) |
915 | { | |
916 | struct lxc_tty_info *tty_info = &conf->tty_info; | |
917 | int i, ret; | |
918 | ||
919 | /* no tty in the configuration */ | |
920 | if (!conf->tty) | |
921 | return 0; | |
922 | ||
923 | tty_info->pty_info = malloc(sizeof(*tty_info->pty_info) * conf->tty); | |
924 | if (!tty_info->pty_info) { | |
925 | SYSERROR("failed to allocate struct *pty_info"); | |
926 | return -ENOMEM; | |
927 | } | |
928 | ||
929 | for (i = 0; i < conf->tty; i++) { | |
930 | struct lxc_pty_info *pty_info = &tty_info->pty_info[i]; | |
931 | ||
932 | process_lock(); | |
933 | ret = openpty(&pty_info->master, &pty_info->slave, | |
934 | pty_info->name, NULL, NULL); | |
935 | process_unlock(); | |
936 | if (ret) { | |
937 | SYSERROR("failed to create pty device number %d", i); | |
938 | tty_info->nbtty = i; | |
939 | lxc_delete_tty(tty_info); | |
940 | return -ENOTTY; | |
941 | } | |
942 | ||
943 | DEBUG("allocated pty \"%s\" with master fd %d and slave fd %d", | |
944 | pty_info->name, pty_info->master, pty_info->slave); | |
945 | ||
946 | /* Prevent leaking the file descriptors to the container */ | |
947 | ret = fcntl(pty_info->master, F_SETFD, FD_CLOEXEC); | |
948 | if (ret < 0) | |
949 | WARN("failed to set FD_CLOEXEC flag on master fd %d of " | |
950 | "pty device \"%s\": %s", | |
951 | pty_info->master, pty_info->name, strerror(errno)); | |
952 | ||
953 | ret = fcntl(pty_info->slave, F_SETFD, FD_CLOEXEC); | |
954 | if (ret < 0) | |
955 | WARN("failed to set FD_CLOEXEC flag on slave fd %d of " | |
956 | "pty device \"%s\": %s", | |
957 | pty_info->slave, pty_info->name, strerror(errno)); | |
958 | ||
959 | pty_info->busy = 0; | |
960 | } | |
961 | ||
962 | tty_info->nbtty = conf->tty; | |
963 | ||
964 | INFO("finished allocating %d pts devices", conf->tty); | |
965 | return 0; | |
966 | } | |
967 | ||
968 | void lxc_delete_tty(struct lxc_tty_info *tty_info) | |
969 | { | |
970 | int i; | |
971 | ||
972 | for (i = 0; i < tty_info->nbtty; i++) { | |
973 | struct lxc_pty_info *pty_info = &tty_info->pty_info[i]; | |
974 | ||
975 | close(pty_info->master); | |
976 | close(pty_info->slave); | |
977 | } | |
978 | ||
979 | free(tty_info->pty_info); | |
980 | tty_info->pty_info = NULL; | |
981 | tty_info->nbtty = 0; | |
982 | } | |
983 | ||
984 | static int lxc_send_ttys_to_parent(struct lxc_handler *handler) | |
985 | { | |
986 | int i; | |
987 | struct lxc_conf *conf = handler->conf; | |
988 | struct lxc_tty_info *tty_info = &conf->tty_info; | |
989 | int sock = handler->data_sock[0]; | |
990 | int ret = -1; | |
991 | ||
992 | if (!conf->tty) | |
993 | return 0; | |
994 | ||
995 | for (i = 0; i < conf->tty; i++) { | |
996 | int ttyfds[2]; | |
997 | struct lxc_pty_info *pty_info = &tty_info->pty_info[i]; | |
998 | ||
999 | ttyfds[0] = pty_info->master; | |
1000 | ttyfds[1] = pty_info->slave; | |
1001 | ||
1002 | ret = lxc_abstract_unix_send_fds(sock, ttyfds, 2, NULL, 0); | |
1003 | if (ret < 0) | |
1004 | break; | |
1005 | ||
1006 | TRACE("Send pty \"%s\" with master fd %d and slave fd %d to " | |
1007 | "parent", pty_info->name, pty_info->master, pty_info->slave); | |
1008 | } | |
1009 | ||
1010 | if (ret < 0) | |
1011 | ERROR("Failed to send %d ttys to parent: %s", conf->tty, | |
1012 | strerror(errno)); | |
1013 | else | |
1014 | TRACE("Sent %d ttys to parent", conf->tty); | |
1015 | ||
1016 | return ret; | |
1017 | } | |
1018 | ||
1019 | static int lxc_create_ttys(struct lxc_handler *handler) | |
1020 | { | |
1021 | int ret = -1; | |
1022 | struct lxc_conf *conf = handler->conf; | |
1023 | ||
1024 | ret = lxc_allocate_ttys(handler->name, conf); | |
1025 | if (ret < 0) { | |
1026 | ERROR("Failed to allocate ttys"); | |
1027 | goto on_error; | |
1028 | } | |
1029 | ||
1030 | ret = lxc_send_ttys_to_parent(handler); | |
1031 | if (ret < 0) { | |
1032 | ERROR("Failed to send ttys to parent"); | |
1033 | goto on_error; | |
1034 | } | |
1035 | ||
1036 | if (!conf->is_execute) { | |
1037 | ret = lxc_setup_ttys(conf); | |
1038 | if (ret < 0) { | |
1039 | ERROR("Failed to setup ttys"); | |
1040 | goto on_error; | |
1041 | } | |
1042 | } | |
1043 | ||
1044 | if (conf->pty_names) { | |
1045 | ret = setenv("container_ttys", conf->pty_names, 1); | |
1046 | if (ret < 0) | |
1047 | SYSERROR("Failed to set \"container_ttys=%s\"", conf->pty_names); | |
1048 | } | |
1049 | ||
1050 | ret = 0; | |
1051 | ||
1052 | on_error: | |
1053 | lxc_delete_tty(&conf->tty_info); | |
1054 | ||
1055 | return ret; | |
1056 | } | |
1057 | ||
59bb8698 | 1058 | static int setup_rootfs_pivot_root(const char *rootfs) |
bf601689 | 1059 | { |
2d489f9e | 1060 | int oldroot = -1, newroot = -1; |
bf601689 | 1061 | |
2d489f9e SH |
1062 | oldroot = open("/", O_DIRECTORY | O_RDONLY); |
1063 | if (oldroot < 0) { | |
1064 | SYSERROR("Error opening old-/ for fchdir"); | |
9ba8130c SH |
1065 | return -1; |
1066 | } | |
2d489f9e SH |
1067 | newroot = open(rootfs, O_DIRECTORY | O_RDONLY); |
1068 | if (newroot < 0) { | |
1069 | SYSERROR("Error opening new-/ for fchdir"); | |
1070 | goto fail; | |
c08556c6 | 1071 | } |
bf601689 | 1072 | |
cc6f6dd7 | 1073 | /* change into new root fs */ |
2d489f9e | 1074 | if (fchdir(newroot)) { |
cc6f6dd7 | 1075 | SYSERROR("can't chdir to new rootfs '%s'", rootfs); |
2d489f9e | 1076 | goto fail; |
cc6f6dd7 DL |
1077 | } |
1078 | ||
cc6f6dd7 | 1079 | /* pivot_root into our new root fs */ |
2d489f9e | 1080 | if (pivot_root(".", ".")) { |
cc6f6dd7 | 1081 | SYSERROR("pivot_root syscall failed"); |
2d489f9e | 1082 | goto fail; |
bf601689 | 1083 | } |
cc6f6dd7 | 1084 | |
2d489f9e SH |
1085 | /* |
1086 | * at this point the old-root is mounted on top of our new-root | |
1087 | * To unmounted it we must not be chdir'd into it, so escape back | |
1088 | * to old-root | |
1089 | */ | |
1090 | if (fchdir(oldroot) < 0) { | |
1091 | SYSERROR("Error entering oldroot"); | |
1092 | goto fail; | |
1093 | } | |
7981ea46 | 1094 | if (umount2(".", MNT_DETACH) < 0) { |
2d489f9e SH |
1095 | SYSERROR("Error detaching old root"); |
1096 | goto fail; | |
cc6f6dd7 DL |
1097 | } |
1098 | ||
2d489f9e SH |
1099 | if (fchdir(newroot) < 0) { |
1100 | SYSERROR("Error re-entering newroot"); | |
1101 | goto fail; | |
1102 | } | |
cc6f6dd7 | 1103 | |
2d489f9e SH |
1104 | close(oldroot); |
1105 | close(newroot); | |
bf601689 | 1106 | |
2d489f9e | 1107 | DEBUG("pivot_root syscall to '%s' successful", rootfs); |
bf601689 | 1108 | |
bf601689 | 1109 | return 0; |
2d489f9e SH |
1110 | |
1111 | fail: | |
1112 | if (oldroot != -1) | |
1113 | close(oldroot); | |
1114 | if (newroot != -1) | |
1115 | close(newroot); | |
1116 | return -1; | |
bf601689 MH |
1117 | } |
1118 | ||
7133b912 CB |
1119 | /* Just create a path for /dev under $lxcpath/$name and in rootfs If we hit an |
1120 | * error, log it but don't fail yet. | |
91c3830e | 1121 | */ |
7133b912 CB |
1122 | static int mount_autodev(const char *name, const struct lxc_rootfs *rootfs, |
1123 | const char *lxcpath) | |
91c3830e SH |
1124 | { |
1125 | int ret; | |
87da4ec3 SH |
1126 | size_t clen; |
1127 | char *path; | |
91c3830e | 1128 | |
7133b912 | 1129 | INFO("Preparing \"/dev\""); |
bc6928ff | 1130 | |
14221cbb | 1131 | /* $(rootfs->mount) + "/dev/pts" + '\0' */ |
ec50007f | 1132 | clen = (rootfs->path ? strlen(rootfs->mount) : 0) + 9; |
87da4ec3 | 1133 | path = alloca(clen); |
bc6928ff | 1134 | |
ec50007f | 1135 | ret = snprintf(path, clen, "%s/dev", rootfs->path ? rootfs->mount : ""); |
7133b912 | 1136 | if (ret < 0 || (size_t)ret >= clen) |
91c3830e | 1137 | return -1; |
bc6928ff | 1138 | |
87da4ec3 | 1139 | if (!dir_exists(path)) { |
7133b912 CB |
1140 | WARN("\"/dev\" directory does not exist. Proceeding without " |
1141 | "autodev being set up"); | |
87da4ec3 | 1142 | return 0; |
bc6928ff | 1143 | } |
87da4ec3 | 1144 | |
1ec0e8e3 | 1145 | ret = safe_mount("none", path, "tmpfs", 0, "size=500000,mode=755", |
7133b912 CB |
1146 | rootfs->path ? rootfs->mount : NULL); |
1147 | if (ret < 0) { | |
1148 | SYSERROR("Failed to mount tmpfs on \"%s\"", path); | |
1ec0e8e3 | 1149 | return -1; |
91c3830e | 1150 | } |
7133b912 | 1151 | INFO("Mounted tmpfs on \"%s\"", path); |
87da4ec3 | 1152 | |
ec50007f | 1153 | ret = snprintf(path, clen, "%s/dev/pts", rootfs->path ? rootfs->mount : ""); |
7133b912 | 1154 | if (ret < 0 || (size_t)ret >= clen) |
91c3830e | 1155 | return -1; |
87da4ec3 | 1156 | |
7133b912 | 1157 | /* If we are running on a devtmpfs mapping, dev/pts may already exist. |
bc6928ff MW |
1158 | * If not, then create it and exit if that fails... |
1159 | */ | |
87da4ec3 | 1160 | if (!dir_exists(path)) { |
bc6928ff | 1161 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); |
7133b912 CB |
1162 | if (ret < 0) { |
1163 | SYSERROR("Failed to create directory \"%s\"", path); | |
bc6928ff MW |
1164 | return -1; |
1165 | } | |
91c3830e SH |
1166 | } |
1167 | ||
7133b912 | 1168 | INFO("Prepared \"/dev\""); |
91c3830e SH |
1169 | return 0; |
1170 | } | |
1171 | ||
c6883f38 | 1172 | struct lxc_devs { |
74a3920a | 1173 | const char *name; |
c6883f38 SH |
1174 | mode_t mode; |
1175 | int maj; | |
1176 | int min; | |
1177 | }; | |
1178 | ||
74a3920a | 1179 | static const struct lxc_devs lxc_devs[] = { |
06749971 CB |
1180 | { "null", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 3 }, |
1181 | { "zero", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 5 }, | |
1182 | { "full", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 7 }, | |
1183 | { "urandom", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 9 }, | |
1184 | { "random", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 1, 8 }, | |
1185 | { "tty", S_IFCHR | S_IRWXU | S_IRWXG | S_IRWXO, 5, 0 }, | |
c6883f38 SH |
1186 | }; |
1187 | ||
27245ff7 | 1188 | static int lxc_fill_autodev(const struct lxc_rootfs *rootfs) |
c6883f38 SH |
1189 | { |
1190 | int ret; | |
c6883f38 SH |
1191 | char path[MAXPATHLEN]; |
1192 | int i; | |
3a32201c | 1193 | mode_t cmask; |
c6883f38 | 1194 | |
3999be0a CB |
1195 | ret = snprintf(path, MAXPATHLEN, "%s/dev", |
1196 | rootfs->path ? rootfs->mount : ""); | |
1197 | if (ret < 0 || ret >= MAXPATHLEN) | |
c6883f38 | 1198 | return -1; |
91c3830e | 1199 | |
0bbf8572 CB |
1200 | /* ignore, just don't try to fill in */ |
1201 | if (!dir_exists(path)) | |
9cb4d183 SH |
1202 | return 0; |
1203 | ||
3999be0a CB |
1204 | INFO("Populating \"/dev\""); |
1205 | ||
3a32201c | 1206 | cmask = umask(S_IXUSR | S_IXGRP | S_IXOTH); |
c6883f38 | 1207 | for (i = 0; i < sizeof(lxc_devs) / sizeof(lxc_devs[0]); i++) { |
74a3920a | 1208 | const struct lxc_devs *d = &lxc_devs[i]; |
0728ebf4 | 1209 | |
3999be0a CB |
1210 | ret = snprintf(path, MAXPATHLEN, "%s/dev/%s", |
1211 | rootfs->path ? rootfs->mount : "", d->name); | |
c6883f38 SH |
1212 | if (ret < 0 || ret >= MAXPATHLEN) |
1213 | return -1; | |
0bbf8572 | 1214 | |
c6883f38 | 1215 | ret = mknod(path, d->mode, makedev(d->maj, d->min)); |
0bbf8572 | 1216 | if (ret < 0) { |
9cb4d183 | 1217 | FILE *pathfile; |
3999be0a | 1218 | char hostpath[MAXPATHLEN]; |
9cb4d183 | 1219 | |
0bbf8572 CB |
1220 | if (errno == EEXIST) { |
1221 | DEBUG("\"%s\" device already existed", path); | |
1222 | continue; | |
1223 | } | |
1224 | ||
1225 | /* Unprivileged containers cannot create devices, so | |
1226 | * bind mount the device from the host. | |
1227 | */ | |
9cb4d183 SH |
1228 | ret = snprintf(hostpath, MAXPATHLEN, "/dev/%s", d->name); |
1229 | if (ret < 0 || ret >= MAXPATHLEN) | |
1230 | return -1; | |
3999be0a | 1231 | |
9cb4d183 SH |
1232 | pathfile = fopen(path, "wb"); |
1233 | if (!pathfile) { | |
3999be0a | 1234 | SYSERROR("Failed to create file \"%s\"", path); |
9cb4d183 SH |
1235 | return -1; |
1236 | } | |
1237 | fclose(pathfile); | |
3999be0a CB |
1238 | |
1239 | ret = safe_mount(hostpath, path, 0, MS_BIND, NULL, | |
1240 | rootfs->path ? rootfs->mount : NULL); | |
1241 | if (ret < 0) { | |
1242 | SYSERROR("Failed to bind mount \"%s\" from " | |
1243 | "host into container", | |
1244 | d->name); | |
9cb4d183 SH |
1245 | return -1; |
1246 | } | |
3999be0a CB |
1247 | DEBUG("Bind mounted \"%s\" onto \"%s\"", hostpath, |
1248 | path); | |
0bbf8572 | 1249 | } else { |
3999be0a | 1250 | DEBUG("Created device node \"%s\"", path); |
c6883f38 SH |
1251 | } |
1252 | } | |
3a32201c | 1253 | umask(cmask); |
c6883f38 | 1254 | |
3999be0a | 1255 | INFO("Populated \"/dev\""); |
c6883f38 SH |
1256 | return 0; |
1257 | } | |
1258 | ||
9aa76a17 | 1259 | static int lxc_setup_rootfs(struct lxc_conf *conf) |
0ad19a3f | 1260 | { |
9aa76a17 | 1261 | int ret; |
10bc1861 | 1262 | struct lxc_storage *bdev; |
91c3e281 | 1263 | const struct lxc_rootfs *rootfs; |
cc28d0b0 | 1264 | |
91c3e281 | 1265 | rootfs = &conf->rootfs; |
a0f379bf | 1266 | if (!rootfs->path) { |
91c3e281 CB |
1267 | if (mount("", "/", NULL, MS_SLAVE | MS_REC, 0)) { |
1268 | SYSERROR("Failed to make / rslave."); | |
a0f379bf DW |
1269 | return -1; |
1270 | } | |
c69bd12f | 1271 | return 0; |
a0f379bf | 1272 | } |
0ad19a3f | 1273 | |
12297168 | 1274 | if (access(rootfs->mount, F_OK)) { |
91c3e281 | 1275 | SYSERROR("Failed to access to \"%s\". Check it is present.", |
12297168 | 1276 | rootfs->mount); |
b1789442 DL |
1277 | return -1; |
1278 | } | |
1279 | ||
8a388ed4 | 1280 | bdev = storage_init(conf); |
9aa76a17 CB |
1281 | if (!bdev) { |
1282 | ERROR("Failed to mount rootfs \"%s\" onto \"%s\" with options \"%s\".", | |
91c3e281 CB |
1283 | rootfs->path, rootfs->mount, |
1284 | rootfs->options ? rootfs->options : "(null)"); | |
9aa76a17 | 1285 | return -1; |
9be53773 | 1286 | } |
9aa76a17 CB |
1287 | |
1288 | ret = bdev->ops->mount(bdev); | |
10bc1861 | 1289 | storage_put(bdev); |
9aa76a17 | 1290 | if (ret < 0) { |
91c3e281 CB |
1291 | ERROR("Failed to mount rootfs \"%s\" onto \"%s\" with options \"%s\".", |
1292 | rootfs->path, rootfs->mount, | |
1293 | rootfs->options ? rootfs->options : "(null)"); | |
c3f0a28c | 1294 | return -1; |
1295 | } | |
0ad19a3f | 1296 | |
91c3e281 CB |
1297 | DEBUG("Mounted rootfs \"%s\" onto \"%s\" with options \"%s\".", |
1298 | rootfs->path, rootfs->mount, | |
1299 | rootfs->options ? rootfs->options : "(null)"); | |
9aa76a17 | 1300 | |
ac778708 DL |
1301 | return 0; |
1302 | } | |
1303 | ||
91e93c71 AV |
1304 | int prepare_ramfs_root(char *root) |
1305 | { | |
eab15c1e | 1306 | char buf[LXC_LINELEN], *p; |
91e93c71 AV |
1307 | char nroot[PATH_MAX]; |
1308 | FILE *f; | |
1309 | int i; | |
1310 | char *p2; | |
1311 | ||
1312 | if (realpath(root, nroot) == NULL) | |
39c7b795 | 1313 | return -errno; |
91e93c71 AV |
1314 | |
1315 | if (chdir("/") == -1) | |
39c7b795 | 1316 | return -errno; |
91e93c71 AV |
1317 | |
1318 | /* | |
1319 | * We could use here MS_MOVE, but in userns this mount is | |
1320 | * locked and can't be moved. | |
1321 | */ | |
39c7b795 | 1322 | if (mount(root, "/", NULL, MS_REC | MS_BIND, NULL) < 0) { |
91e93c71 | 1323 | SYSERROR("Failed to move %s into /", root); |
39c7b795 | 1324 | return -errno; |
91e93c71 AV |
1325 | } |
1326 | ||
39c7b795 | 1327 | if (mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL) < 0) { |
91e93c71 | 1328 | SYSERROR("Failed to make . rprivate"); |
39c7b795 | 1329 | return -errno; |
91e93c71 AV |
1330 | } |
1331 | ||
1332 | /* | |
1333 | * The following code cleans up inhereted mounts which are not | |
1334 | * required for CT. | |
1335 | * | |
1336 | * The mountinfo file shows not all mounts, if a few points have been | |
1337 | * unmounted between read operations from the mountinfo. So we need to | |
1338 | * read mountinfo a few times. | |
1339 | * | |
1340 | * This loop can be skipped if a container uses unserns, because all | |
1341 | * inherited mounts are locked and we should live with all this trash. | |
1342 | */ | |
1343 | while (1) { | |
1344 | int progress = 0; | |
1345 | ||
1346 | f = fopen("./proc/self/mountinfo", "r"); | |
1347 | if (!f) { | |
1348 | SYSERROR("Unable to open /proc/self/mountinfo"); | |
1349 | return -1; | |
1350 | } | |
eab15c1e | 1351 | while (fgets(buf, LXC_LINELEN, f)) { |
91e93c71 AV |
1352 | for (p = buf, i=0; p && i < 4; i++) |
1353 | p = strchr(p+1, ' '); | |
1354 | if (!p) | |
1355 | continue; | |
1356 | p2 = strchr(p+1, ' '); | |
1357 | if (!p2) | |
1358 | continue; | |
1359 | ||
1360 | *p2 = '\0'; | |
1361 | *p = '.'; | |
1362 | ||
1363 | if (strcmp(p + 1, "/") == 0) | |
1364 | continue; | |
1365 | if (strcmp(p + 1, "/proc") == 0) | |
1366 | continue; | |
1367 | ||
1368 | if (umount2(p, MNT_DETACH) == 0) | |
1369 | progress++; | |
1370 | } | |
1371 | fclose(f); | |
1372 | if (!progress) | |
1373 | break; | |
1374 | } | |
1375 | ||
8bea9fae PR |
1376 | /* This also can be skipped if a container uses unserns */ |
1377 | umount2("./proc", MNT_DETACH); | |
91e93c71 AV |
1378 | |
1379 | /* It is weird, but chdir("..") moves us in a new root */ | |
1380 | if (chdir("..") == -1) { | |
1381 | SYSERROR("Unable to change working directory"); | |
1382 | return -1; | |
1383 | } | |
1384 | ||
1385 | if (chroot(".") == -1) { | |
1386 | SYSERROR("Unable to chroot"); | |
1387 | return -1; | |
1388 | } | |
1389 | ||
1390 | return 0; | |
1391 | } | |
1392 | ||
74a3920a | 1393 | static int setup_pivot_root(const struct lxc_rootfs *rootfs) |
ac778708 | 1394 | { |
39c7b795 CB |
1395 | if (!rootfs->path) { |
1396 | DEBUG("container does not have a rootfs, so not doing pivot root"); | |
ac778708 | 1397 | return 0; |
39c7b795 | 1398 | } |
ac778708 | 1399 | |
91e93c71 | 1400 | if (detect_ramfs_rootfs()) { |
39c7b795 CB |
1401 | DEBUG("detected that container is on ramfs"); |
1402 | if (prepare_ramfs_root(rootfs->mount)) { | |
1403 | ERROR("failed to prepare minimal ramfs root"); | |
91e93c71 | 1404 | return -1; |
39c7b795 CB |
1405 | } |
1406 | ||
1407 | DEBUG("prepared ramfs root for container"); | |
1408 | return 0; | |
1409 | } | |
1410 | ||
1411 | if (setup_rootfs_pivot_root(rootfs->mount) < 0) { | |
1412 | ERROR("failed to pivot root"); | |
25368b52 | 1413 | return -1; |
c69bd12f DL |
1414 | } |
1415 | ||
39c7b795 | 1416 | DEBUG("finished pivot root"); |
25368b52 | 1417 | return 0; |
0ad19a3f | 1418 | } |
1419 | ||
f4900711 CB |
1420 | static struct id_map *find_mapped_nsid_entry(struct lxc_conf *conf, unsigned id, |
1421 | enum idtype idtype) | |
1422 | { | |
1423 | struct lxc_list *it; | |
1424 | struct id_map *map; | |
1425 | struct id_map *retmap = NULL; | |
1426 | ||
dcf0ffdf CB |
1427 | /* Shortcut for container's root mappings. */ |
1428 | if (id == 0) { | |
1429 | if (idtype == ID_TYPE_UID) | |
1430 | return conf->root_nsuid_map; | |
1431 | ||
1432 | if (idtype == ID_TYPE_GID) | |
1433 | return conf->root_nsgid_map; | |
1434 | } | |
1435 | ||
f4900711 CB |
1436 | lxc_list_for_each(it, &conf->id_map) { |
1437 | map = it->elem; | |
1438 | if (map->idtype != idtype) | |
1439 | continue; | |
1440 | ||
1441 | if (id >= map->nsid && id < map->nsid + map->range) { | |
1442 | retmap = map; | |
1443 | break; | |
1444 | } | |
1445 | } | |
1446 | ||
1447 | return retmap; | |
1448 | } | |
1449 | ||
1450 | static int lxc_setup_devpts(struct lxc_conf *conf) | |
3c26f34e | 1451 | { |
70761e5e | 1452 | int ret; |
f4900711 | 1453 | const char *default_devpts_mntopts; |
9d28c4f9 | 1454 | char devpts_mntopts[256]; |
77890c6d | 1455 | |
f4900711 | 1456 | if (conf->pts <= 0) { |
70761e5e CB |
1457 | DEBUG("no new devpts instance will be mounted since no pts " |
1458 | "devices are requested"); | |
d852c78c | 1459 | return 0; |
3c26f34e | 1460 | } |
1461 | ||
f4900711 CB |
1462 | if (!find_mapped_nsid_entry(conf, 5, ID_TYPE_GID)) |
1463 | default_devpts_mntopts = "newinstance,ptmxmode=0666,mode=0620"; | |
1464 | else | |
1465 | default_devpts_mntopts = "newinstance,ptmxmode=0666,mode=0620,gid=5"; | |
1466 | ||
9d28c4f9 | 1467 | ret = snprintf(devpts_mntopts, sizeof(devpts_mntopts), "%s,max=%d", |
f4900711 | 1468 | default_devpts_mntopts, conf->pts); |
9d28c4f9 CB |
1469 | if (ret < 0 || (size_t)ret >= sizeof(devpts_mntopts)) |
1470 | return -1; | |
1471 | ||
d5cb35d6 | 1472 | /* Unmount old devpts instance. */ |
70761e5e CB |
1473 | ret = access("/dev/pts/ptmx", F_OK); |
1474 | if (!ret) { | |
70761e5e CB |
1475 | ret = umount("/dev/pts"); |
1476 | if (ret < 0) { | |
1477 | SYSERROR("failed to unmount old devpts instance"); | |
1478 | return -1; | |
7e40254a | 1479 | } |
70761e5e | 1480 | DEBUG("unmounted old /dev/pts instance"); |
7e40254a JTLB |
1481 | } |
1482 | ||
70761e5e CB |
1483 | /* Create mountpoint for devpts instance. */ |
1484 | ret = mkdir("/dev/pts", 0755); | |
1485 | if (ret < 0 && errno != EEXIST) { | |
1486 | SYSERROR("failed to create the \"/dev/pts\" directory"); | |
3c26f34e | 1487 | return -1; |
1488 | } | |
1489 | ||
70761e5e | 1490 | /* Mount new devpts instance. */ |
f4900711 | 1491 | ret = mount("devpts", "/dev/pts", "devpts", MS_NOSUID | MS_NOEXEC, devpts_mntopts); |
70761e5e CB |
1492 | if (ret < 0) { |
1493 | SYSERROR("failed to mount new devpts instance"); | |
1494 | return -1; | |
1495 | } | |
f4f52cb5 | 1496 | DEBUG("mount new devpts instance with options \"%s\"", devpts_mntopts); |
70761e5e | 1497 | |
d5cb35d6 | 1498 | /* Remove any pre-existing /dev/ptmx file. */ |
70761e5e | 1499 | ret = access("/dev/ptmx", F_OK); |
d5cb35d6 CB |
1500 | if (!ret) { |
1501 | ret = remove("/dev/ptmx"); | |
1502 | if (ret < 0) { | |
1503 | SYSERROR("failed to remove existing \"/dev/ptmx\""); | |
1504 | return -1; | |
70761e5e | 1505 | } |
d5cb35d6 | 1506 | DEBUG("removed existing \"/dev/ptmx\""); |
3c26f34e | 1507 | } |
1508 | ||
d5cb35d6 CB |
1509 | /* Create dummy /dev/ptmx file as bind mountpoint for /dev/pts/ptmx. */ |
1510 | ret = open("/dev/ptmx", O_CREAT, 0666); | |
1511 | if (ret < 0) { | |
1512 | SYSERROR("failed to create dummy \"/dev/ptmx\" file as bind mount target"); | |
1513 | return -1; | |
1514 | } | |
e87bd19c | 1515 | close(ret); |
d5cb35d6 | 1516 | DEBUG("created dummy \"/dev/ptmx\" file as bind mount target"); |
77890c6d | 1517 | |
d5cb35d6 | 1518 | /* Fallback option: create symlink /dev/ptmx -> /dev/pts/ptmx */ |
e87bd19c | 1519 | ret = mount("/dev/pts/ptmx", "/dev/ptmx", NULL, MS_BIND, NULL); |
d5cb35d6 CB |
1520 | if (!ret) { |
1521 | DEBUG("bind mounted \"/dev/pts/ptmx\" to \"/dev/ptmx\""); | |
1522 | return 0; | |
1523 | } else { | |
1524 | /* Fallthrough and try to create a symlink. */ | |
1525 | ERROR("failed to bind mount \"/dev/pts/ptmx\" to \"/dev/ptmx\""); | |
1526 | } | |
1527 | ||
1528 | /* Remove the dummy /dev/ptmx file we created above. */ | |
1529 | ret = remove("/dev/ptmx"); | |
70761e5e | 1530 | if (ret < 0) { |
d5cb35d6 CB |
1531 | SYSERROR("failed to remove existing \"/dev/ptmx\""); |
1532 | return -1; | |
1533 | } | |
1534 | ||
1535 | /* Fallback option: Create symlink /dev/ptmx -> /dev/pts/ptmx. */ | |
1536 | ret = symlink("/dev/pts/ptmx", "/dev/ptmx"); | |
1537 | if (ret < 0) { | |
1538 | SYSERROR("failed to create symlink \"/dev/ptmx\" -> \"/dev/pts/ptmx\""); | |
3c26f34e | 1539 | return -1; |
1540 | } | |
d5cb35d6 | 1541 | DEBUG("created symlink \"/dev/ptmx\" -> \"/dev/pts/ptmx\""); |
cd54d859 | 1542 | |
3c26f34e | 1543 | return 0; |
1544 | } | |
1545 | ||
cccc74b5 DL |
1546 | static int setup_personality(int persona) |
1547 | { | |
6ff05e18 | 1548 | #if HAVE_SYS_PERSONALITY_H |
cccc74b5 DL |
1549 | if (persona == -1) |
1550 | return 0; | |
1551 | ||
1552 | if (personality(persona) < 0) { | |
1553 | SYSERROR("failed to set personality to '0x%x'", persona); | |
1554 | return -1; | |
1555 | } | |
1556 | ||
1557 | INFO("set personality to '0x%x'", persona); | |
6ff05e18 | 1558 | #endif |
cccc74b5 DL |
1559 | |
1560 | return 0; | |
1561 | } | |
1562 | ||
3d7d929a CB |
1563 | static int lxc_setup_dev_console(const struct lxc_rootfs *rootfs, |
1564 | const struct lxc_console *console) | |
6e590161 | 1565 | { |
63376d7d | 1566 | char path[MAXPATHLEN]; |
0728ebf4 | 1567 | int ret, fd; |
52e35957 | 1568 | |
8b1b1210 CB |
1569 | if (console->path && !strcmp(console->path, "none")) |
1570 | return 0; | |
1571 | ||
7c6ef2a2 | 1572 | ret = snprintf(path, sizeof(path), "%s/dev/console", rootfs->mount); |
3d7d929a | 1573 | if (ret < 0 || (size_t)ret >= sizeof(path)) |
7c6ef2a2 | 1574 | return -1; |
52e35957 | 1575 | |
8b1b1210 CB |
1576 | /* When we are asked to setup a console we remove any previous |
1577 | * /dev/console bind-mounts. | |
1578 | */ | |
a7ba3c7f CB |
1579 | if (file_exists(path)) { |
1580 | ret = lxc_unstack_mountpoint(path, false); | |
1581 | if (ret < 0) { | |
8b1b1210 | 1582 | ERROR("failed to unmount \"%s\": %s", path, strerror(errno)); |
a7ba3c7f CB |
1583 | return -ret; |
1584 | } else { | |
1585 | DEBUG("cleared all (%d) mounts from \"%s\"", ret, path); | |
1586 | } | |
953fe44f | 1587 | |
a7ba3c7f CB |
1588 | ret = unlink(path); |
1589 | if (ret < 0) { | |
1590 | SYSERROR("error unlinking %s", path); | |
8b1b1210 CB |
1591 | return -errno; |
1592 | } | |
8b1b1210 CB |
1593 | } |
1594 | ||
1595 | /* For unprivileged containers autodev or automounts will already have | |
1596 | * taken care of creating /dev/console. | |
1597 | */ | |
0728ebf4 TA |
1598 | fd = open(path, O_CREAT | O_EXCL, S_IXUSR | S_IXGRP | S_IXOTH); |
1599 | if (fd < 0) { | |
1600 | if (errno != EEXIST) { | |
1601 | SYSERROR("failed to create console"); | |
3d7d929a | 1602 | return -errno; |
0728ebf4 TA |
1603 | } |
1604 | } else { | |
1605 | close(fd); | |
52e35957 DL |
1606 | } |
1607 | ||
0728ebf4 | 1608 | if (chmod(console->name, S_IXUSR | S_IXGRP | S_IXOTH)) { |
3d7d929a CB |
1609 | SYSERROR("failed to set mode '0%o' to '%s'", S_IXUSR | S_IXGRP | S_IXOTH, console->name); |
1610 | return -errno; | |
63376d7d | 1611 | } |
13954cce | 1612 | |
3d7d929a | 1613 | if (safe_mount(console->name, path, "none", MS_BIND, 0, rootfs->mount) < 0) { |
63376d7d | 1614 | ERROR("failed to mount '%s' on '%s'", console->name, path); |
6e590161 | 1615 | return -1; |
1616 | } | |
1617 | ||
3d7d929a | 1618 | DEBUG("mounted pts device \"%s\" onto \"%s\"", console->name, path); |
7c6ef2a2 SH |
1619 | return 0; |
1620 | } | |
1621 | ||
3d7d929a CB |
1622 | static int lxc_setup_ttydir_console(const struct lxc_rootfs *rootfs, |
1623 | const struct lxc_console *console, | |
1624 | char *ttydir) | |
7c6ef2a2 | 1625 | { |
7c6ef2a2 | 1626 | int ret; |
3d7d929a | 1627 | char path[MAXPATHLEN], lxcpath[MAXPATHLEN]; |
7c6ef2a2 SH |
1628 | |
1629 | /* create rootfs/dev/<ttydir> directory */ | |
3d7d929a CB |
1630 | ret = snprintf(path, sizeof(path), "%s/dev/%s", rootfs->mount, ttydir); |
1631 | if (ret < 0 || (size_t)ret >= sizeof(path)) | |
7c6ef2a2 | 1632 | return -1; |
3d7d929a | 1633 | |
7c6ef2a2 SH |
1634 | ret = mkdir(path, 0755); |
1635 | if (ret && errno != EEXIST) { | |
959aee9c | 1636 | SYSERROR("failed with errno %d to create %s", errno, path); |
3d7d929a | 1637 | return -errno; |
7c6ef2a2 | 1638 | } |
4742cd9a | 1639 | DEBUG("Created directory for console and tty devices at \"%s\"", path); |
7c6ef2a2 | 1640 | |
3d7d929a CB |
1641 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/dev/%s/console", rootfs->mount, ttydir); |
1642 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) | |
1643 | return -1; | |
1644 | ||
7c6ef2a2 | 1645 | ret = creat(lxcpath, 0660); |
3d7d929a | 1646 | if (ret == -1 && errno != EEXIST) { |
959aee9c | 1647 | SYSERROR("error %d creating %s", errno, lxcpath); |
3d7d929a | 1648 | return -errno; |
7c6ef2a2 | 1649 | } |
4d44e274 SH |
1650 | if (ret >= 0) |
1651 | close(ret); | |
7c6ef2a2 | 1652 | |
2a12fefd CB |
1653 | ret = snprintf(path, sizeof(path), "%s/dev/console", rootfs->mount); |
1654 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) | |
7c6ef2a2 | 1655 | return -1; |
2a12fefd CB |
1656 | |
1657 | /* When we are asked to setup a console we remove any previous | |
1658 | * /dev/console bind-mounts. | |
1659 | */ | |
1660 | if (console->path && !strcmp(console->path, "none")) { | |
1661 | struct stat st; | |
1662 | ret = stat(path, &st); | |
1663 | if (ret < 0) { | |
1664 | if (errno == ENOENT) | |
1665 | return 0; | |
1666 | SYSERROR("failed stat() \"%s\"", path); | |
1667 | return -errno; | |
1668 | } | |
1669 | ||
1670 | /* /dev/console must be character device with major number 5 and | |
1671 | * minor number 1. If not, give benefit of the doubt and assume | |
1672 | * the user has mounted something else right there on purpose. | |
1673 | */ | |
1674 | if (((st.st_mode & S_IFMT) != S_IFCHR) || major(st.st_rdev) != 5 || minor(st.st_rdev) != 1) | |
1675 | return 0; | |
1676 | ||
1677 | /* In case the user requested a bind-mount for /dev/console and | |
1678 | * requests a ttydir we move the mount to the | |
a7ba3c7f CB |
1679 | * /dev/<ttydir/console. |
1680 | * Note, we only move the uppermost mount and clear all other | |
1681 | * mounts underneath for safety. | |
1682 | * If it is a character device created via mknod() we simply | |
1683 | * rename it. | |
2a12fefd CB |
1684 | */ |
1685 | ret = safe_mount(path, lxcpath, "none", MS_MOVE, NULL, rootfs->mount); | |
1686 | if (ret < 0) { | |
1687 | if (errno != EINVAL) { | |
1688 | ERROR("failed to MS_MOVE \"%s\" to \"%s\": %s", path, lxcpath, strerror(errno)); | |
1689 | return -errno; | |
1690 | } | |
1691 | /* path was not a mountpoint */ | |
1692 | ret = rename(path, lxcpath); | |
1693 | if (ret < 0) { | |
1694 | ERROR("failed to rename \"%s\" to \"%s\": %s", path, lxcpath, strerror(errno)); | |
1695 | return -errno; | |
1696 | } | |
1697 | DEBUG("renamed \"%s\" to \"%s\"", path, lxcpath); | |
1698 | } else { | |
1699 | DEBUG("moved mount \"%s\" to \"%s\"", path, lxcpath); | |
1700 | } | |
a7ba3c7f CB |
1701 | |
1702 | /* Clear all remaining bind-mounts. */ | |
1703 | ret = lxc_unstack_mountpoint(path, false); | |
2a12fefd | 1704 | if (ret < 0) { |
a7ba3c7f CB |
1705 | ERROR("failed to unmount \"%s\": %s", path, strerror(errno)); |
1706 | return -ret; | |
1707 | } else { | |
1708 | DEBUG("cleared all (%d) mounts from \"%s\"", ret, path); | |
1709 | } | |
1710 | } else { | |
1711 | if (file_exists(path)) { | |
1712 | ret = lxc_unstack_mountpoint(path, false); | |
1713 | if (ret < 0) { | |
2a12fefd | 1714 | ERROR("failed to unmount \"%s\": %s", path, strerror(errno)); |
a7ba3c7f CB |
1715 | return -ret; |
1716 | } else { | |
1717 | DEBUG("cleared all (%d) mounts from \"%s\"", ret, path); | |
2a12fefd | 1718 | } |
2a12fefd CB |
1719 | } |
1720 | ||
1721 | if (safe_mount(console->name, lxcpath, "none", MS_BIND, 0, rootfs->mount) < 0) { | |
1722 | ERROR("failed to mount '%s' on '%s'", console->name, lxcpath); | |
1723 | return -1; | |
1724 | } | |
1725 | DEBUG("mounted \"%s\" onto \"%s\"", console->name, lxcpath); | |
7c6ef2a2 SH |
1726 | } |
1727 | ||
2a12fefd | 1728 | /* create symlink from rootfs /dev/console to '<ttydir>/console' */ |
9ba8130c | 1729 | ret = snprintf(lxcpath, sizeof(lxcpath), "%s/console", ttydir); |
3d7d929a | 1730 | if (ret < 0 || (size_t)ret >= sizeof(lxcpath)) |
9ba8130c | 1731 | return -1; |
3d7d929a | 1732 | |
2a12fefd CB |
1733 | ret = unlink(path); |
1734 | if (ret && errno != ENOENT) { | |
1735 | SYSERROR("error unlinking %s", path); | |
1736 | return -errno; | |
1737 | } | |
1738 | ||
7c6ef2a2 | 1739 | ret = symlink(lxcpath, path); |
3d7d929a CB |
1740 | if (ret < 0) { |
1741 | SYSERROR("failed to create symlink for console from \"%s\" to \"%s\"", lxcpath, path); | |
7c6ef2a2 SH |
1742 | return -1; |
1743 | } | |
1744 | ||
3d7d929a | 1745 | DEBUG("console has been setup under \"%s\" and symlinked to \"%s\"", lxcpath, path); |
6e590161 | 1746 | return 0; |
1747 | } | |
1748 | ||
3d7d929a CB |
1749 | static int lxc_setup_console(const struct lxc_rootfs *rootfs, |
1750 | const struct lxc_console *console, char *ttydir) | |
7c6ef2a2 | 1751 | { |
3d7d929a CB |
1752 | /* We don't have a rootfs, /dev/console will be shared. */ |
1753 | if (!rootfs->path) { | |
1754 | DEBUG("/dev/console will be shared with the host"); | |
7c6ef2a2 | 1755 | return 0; |
3d7d929a CB |
1756 | } |
1757 | ||
7c6ef2a2 | 1758 | if (!ttydir) |
3d7d929a | 1759 | return lxc_setup_dev_console(rootfs, console); |
7c6ef2a2 | 1760 | |
3d7d929a | 1761 | return lxc_setup_ttydir_console(rootfs, console, ttydir); |
7c6ef2a2 SH |
1762 | } |
1763 | ||
998ac676 RT |
1764 | static void parse_mntopt(char *opt, unsigned long *flags, char **data) |
1765 | { | |
1766 | struct mount_opt *mo; | |
1767 | ||
1768 | /* If opt is found in mount_opt, set or clear flags. | |
1769 | * Otherwise append it to data. */ | |
1770 | ||
1771 | for (mo = &mount_opt[0]; mo->name != NULL; mo++) { | |
1772 | if (!strncmp(opt, mo->name, strlen(mo->name))) { | |
1773 | if (mo->clear) | |
1774 | *flags &= ~mo->flag; | |
1775 | else | |
1776 | *flags |= mo->flag; | |
1777 | return; | |
1778 | } | |
1779 | } | |
1780 | ||
1781 | if (strlen(*data)) | |
1782 | strcat(*data, ","); | |
1783 | strcat(*data, opt); | |
1784 | } | |
1785 | ||
a17b1e65 | 1786 | int parse_mntopts(const char *mntopts, unsigned long *mntflags, |
998ac676 RT |
1787 | char **mntdata) |
1788 | { | |
1789 | char *s, *data; | |
1790 | char *p, *saveptr = NULL; | |
1791 | ||
911324ef | 1792 | *mntdata = NULL; |
91656ce5 | 1793 | *mntflags = 0L; |
911324ef DL |
1794 | |
1795 | if (!mntopts) | |
998ac676 RT |
1796 | return 0; |
1797 | ||
911324ef | 1798 | s = strdup(mntopts); |
998ac676 | 1799 | if (!s) { |
36eb9bde | 1800 | SYSERROR("failed to allocate memory"); |
998ac676 RT |
1801 | return -1; |
1802 | } | |
1803 | ||
1804 | data = malloc(strlen(s) + 1); | |
1805 | if (!data) { | |
36eb9bde | 1806 | SYSERROR("failed to allocate memory"); |
998ac676 RT |
1807 | free(s); |
1808 | return -1; | |
1809 | } | |
1810 | *data = 0; | |
1811 | ||
1812 | for (p = strtok_r(s, ",", &saveptr); p != NULL; | |
1813 | p = strtok_r(NULL, ",", &saveptr)) | |
1814 | parse_mntopt(p, mntflags, &data); | |
1815 | ||
1816 | if (*data) | |
1817 | *mntdata = data; | |
1818 | else | |
1819 | free(data); | |
1820 | free(s); | |
1821 | ||
1822 | return 0; | |
1823 | } | |
1824 | ||
6fd5e769 SH |
1825 | static void null_endofword(char *word) |
1826 | { | |
1827 | while (*word && *word != ' ' && *word != '\t') | |
1828 | word++; | |
1829 | *word = '\0'; | |
1830 | } | |
1831 | ||
1832 | /* | |
1833 | * skip @nfields spaces in @src | |
1834 | */ | |
1835 | static char *get_field(char *src, int nfields) | |
1836 | { | |
1837 | char *p = src; | |
1838 | int i; | |
1839 | ||
1840 | for (i = 0; i < nfields; i++) { | |
1841 | while (*p && *p != ' ' && *p != '\t') | |
1842 | p++; | |
1843 | if (!*p) | |
1844 | break; | |
1845 | p++; | |
1846 | } | |
1847 | return p; | |
1848 | } | |
1849 | ||
911324ef DL |
1850 | static int mount_entry(const char *fsname, const char *target, |
1851 | const char *fstype, unsigned long mountflags, | |
d6bec4ab YT |
1852 | const char *data, bool optional, bool dev, |
1853 | bool relative, const char *rootfs) | |
911324ef | 1854 | { |
0ac4b28a | 1855 | int ret; |
181437fd YT |
1856 | char srcbuf[MAXPATHLEN]; |
1857 | const char *srcpath = fsname; | |
614305f3 | 1858 | #ifdef HAVE_STATVFS |
2938f7c8 | 1859 | struct statvfs sb; |
614305f3 | 1860 | #endif |
2938f7c8 | 1861 | |
181437fd YT |
1862 | if (relative) { |
1863 | ret = snprintf(srcbuf, MAXPATHLEN, "%s/%s", rootfs ? rootfs : "/", fsname ? fsname : ""); | |
1864 | if (ret < 0 || ret >= MAXPATHLEN) { | |
1865 | ERROR("source path is too long"); | |
1866 | return -1; | |
1867 | } | |
1868 | srcpath = srcbuf; | |
1869 | } | |
1870 | ||
1871 | ret = safe_mount(srcpath, target, fstype, mountflags & ~MS_REMOUNT, data, | |
0ac4b28a CB |
1872 | rootfs); |
1873 | if (ret < 0) { | |
1fc64d22 | 1874 | if (optional) { |
0ac4b28a | 1875 | INFO("Failed to mount \"%s\" on \"%s\" (optional): %s", |
181437fd | 1876 | srcpath ? srcpath : "(null)", target, strerror(errno)); |
1fc64d22 SG |
1877 | return 0; |
1878 | } | |
0ac4b28a | 1879 | |
0103eb53 | 1880 | SYSERROR("Failed to mount \"%s\" on \"%s\"", |
181437fd | 1881 | srcpath ? srcpath : "(null)", target); |
0ac4b28a | 1882 | return -1; |
911324ef DL |
1883 | } |
1884 | ||
1885 | if ((mountflags & MS_REMOUNT) || (mountflags & MS_BIND)) { | |
7c5b6e7c | 1886 | unsigned long rqd_flags = 0; |
0ac4b28a CB |
1887 | |
1888 | DEBUG("Remounting \"%s\" on \"%s\" to respect bind or remount " | |
181437fd | 1889 | "options", srcpath ? srcpath : "(none)", target ? target : "(none)"); |
0ac4b28a | 1890 | |
7c5b6e7c AS |
1891 | if (mountflags & MS_RDONLY) |
1892 | rqd_flags |= MS_RDONLY; | |
614305f3 | 1893 | #ifdef HAVE_STATVFS |
181437fd | 1894 | if (srcpath && statvfs(srcpath, &sb) == 0) { |
7c5b6e7c | 1895 | unsigned long required_flags = rqd_flags; |
0ac4b28a | 1896 | |
2938f7c8 SH |
1897 | if (sb.f_flag & MS_NOSUID) |
1898 | required_flags |= MS_NOSUID; | |
0ac4b28a | 1899 | |
ae7a770e | 1900 | if (sb.f_flag & MS_NODEV && !dev) |
2938f7c8 | 1901 | required_flags |= MS_NODEV; |
0ac4b28a | 1902 | |
2938f7c8 SH |
1903 | if (sb.f_flag & MS_RDONLY) |
1904 | required_flags |= MS_RDONLY; | |
0ac4b28a | 1905 | |
2938f7c8 SH |
1906 | if (sb.f_flag & MS_NOEXEC) |
1907 | required_flags |= MS_NOEXEC; | |
0ac4b28a CB |
1908 | |
1909 | DEBUG("Flags for \"%s\" were %lu, required extra flags " | |
181437fd | 1910 | "are %lu", srcpath, sb.f_flag, required_flags); |
0ac4b28a CB |
1911 | |
1912 | /* If this was a bind mount request, and required_flags | |
2938f7c8 | 1913 | * does not have any flags which are not already in |
0ac4b28a | 1914 | * mountflags, then skip the remount. |
2938f7c8 SH |
1915 | */ |
1916 | if (!(mountflags & MS_REMOUNT)) { | |
0ac4b28a CB |
1917 | if (!(required_flags & ~mountflags) && |
1918 | rqd_flags == 0) { | |
1919 | DEBUG("Mountflags already were %lu, " | |
1920 | "skipping remount", mountflags); | |
2938f7c8 SH |
1921 | goto skipremount; |
1922 | } | |
1923 | } | |
0ac4b28a | 1924 | |
2938f7c8 | 1925 | mountflags |= required_flags; |
6fd5e769 | 1926 | } |
614305f3 | 1927 | #endif |
911324ef | 1928 | |
181437fd | 1929 | ret = mount(srcpath, target, fstype, mountflags | MS_REMOUNT, data); |
0ac4b28a | 1930 | if (ret < 0) { |
1fc64d22 | 1931 | if (optional) { |
0ac4b28a | 1932 | INFO("Failed to mount \"%s\" on \"%s\" " |
0103eb53 | 1933 | "(optional): %s", |
181437fd | 1934 | srcpath ? srcpath : "(null)", target, |
0ac4b28a | 1935 | strerror(errno)); |
1fc64d22 SG |
1936 | return 0; |
1937 | } | |
0ac4b28a | 1938 | |
0103eb53 | 1939 | SYSERROR("Failed to mount \"%s\" on \"%s\"", |
181437fd | 1940 | srcpath ? srcpath : "(null)", target); |
0ac4b28a | 1941 | return -1; |
911324ef DL |
1942 | } |
1943 | } | |
1944 | ||
614305f3 | 1945 | #ifdef HAVE_STATVFS |
6fd5e769 | 1946 | skipremount: |
614305f3 | 1947 | #endif |
0103eb53 | 1948 | DEBUG("Mounted \"%s\" on \"%s\" with filesystem type \"%s\"", |
181437fd | 1949 | srcpath ? srcpath : "(null)", target, fstype); |
911324ef DL |
1950 | |
1951 | return 0; | |
1952 | } | |
1953 | ||
c5e30de4 | 1954 | /* Remove "optional", "create=dir", and "create=file" from mntopt */ |
4e4ca161 SH |
1955 | static void cull_mntent_opt(struct mntent *mntent) |
1956 | { | |
1957 | int i; | |
181437fd | 1958 | char *list[] = {"create=dir", "create=file", "optional", "relative", NULL}; |
c5e30de4 CB |
1959 | |
1960 | for (i = 0; list[i]; i++) { | |
1961 | char *p, *p2; | |
1962 | ||
1963 | p = strstr(mntent->mnt_opts, list[i]); | |
1964 | if (!p) | |
4e4ca161 | 1965 | continue; |
c5e30de4 | 1966 | |
4e4ca161 SH |
1967 | p2 = strchr(p, ','); |
1968 | if (!p2) { | |
1969 | /* no more mntopts, so just chop it here */ | |
1970 | *p = '\0'; | |
1971 | continue; | |
1972 | } | |
c5e30de4 CB |
1973 | |
1974 | memmove(p, p2 + 1, strlen(p2 + 1) + 1); | |
4e4ca161 SH |
1975 | } |
1976 | } | |
1977 | ||
4d5b72a1 | 1978 | static int mount_entry_create_dir_file(const struct mntent *mntent, |
749f98d9 CB |
1979 | const char *path, |
1980 | const struct lxc_rootfs *rootfs, | |
1981 | const char *lxc_name, | |
1982 | const char *lxc_path) | |
0ad19a3f | 1983 | { |
608e3567 | 1984 | int ret = 0; |
911324ef | 1985 | |
749f98d9 CB |
1986 | if (!strncmp(mntent->mnt_type, "overlay", 7)) |
1987 | ret = ovl_mkdir(mntent, rootfs, lxc_name, lxc_path); | |
1988 | else if (!strncmp(mntent->mnt_type, "aufs", 4)) | |
1989 | ret = aufs_mkdir(mntent, rootfs, lxc_name, lxc_path); | |
1990 | if (ret < 0) | |
1991 | return -1; | |
6e46cc0d | 1992 | |
34cfffb3 | 1993 | if (hasmntopt(mntent, "create=dir")) { |
749f98d9 CB |
1994 | ret = mkdir_p(path, 0755); |
1995 | if (ret < 0 && errno != EEXIST) { | |
1996 | SYSERROR("Failed to create directory \"%s\"", path); | |
1997 | return -1; | |
34cfffb3 SG |
1998 | } |
1999 | } | |
2000 | ||
4d5b72a1 | 2001 | if (hasmntopt(mntent, "create=file") && access(path, F_OK)) { |
749f98d9 CB |
2002 | int fd; |
2003 | char *p1, *p2; | |
2004 | ||
2005 | p1 = strdup(path); | |
2006 | if (!p1) | |
2007 | return -1; | |
2008 | ||
2009 | p2 = dirname(p1); | |
2010 | ||
2011 | ret = mkdir_p(p2, 0755); | |
2012 | free(p1); | |
2013 | if (ret < 0 && errno != EEXIST) { | |
2014 | SYSERROR("Failed to create directory \"%s\"", path); | |
2015 | return -1; | |
6e46cc0d | 2016 | } |
749f98d9 CB |
2017 | |
2018 | fd = open(path, O_CREAT, 0644); | |
2019 | if (fd < 0) | |
2020 | return -1; | |
2021 | close(fd); | |
34cfffb3 | 2022 | } |
749f98d9 CB |
2023 | |
2024 | return 0; | |
4d5b72a1 NC |
2025 | } |
2026 | ||
ec50007f CB |
2027 | /* rootfs, lxc_name, and lxc_path can be NULL when the container is created |
2028 | * without a rootfs. */ | |
db4aba38 | 2029 | static inline int mount_entry_on_generic(struct mntent *mntent, |
d8b712bc CB |
2030 | const char *path, |
2031 | const struct lxc_rootfs *rootfs, | |
2032 | const char *lxc_name, | |
2033 | const char *lxc_path) | |
4d5b72a1 | 2034 | { |
d8b712bc | 2035 | int ret; |
4d5b72a1 NC |
2036 | unsigned long mntflags; |
2037 | char *mntdata; | |
181437fd | 2038 | bool dev, optional, relative; |
ec50007f | 2039 | char *rootfs_path = NULL; |
d8b712bc CB |
2040 | |
2041 | optional = hasmntopt(mntent, "optional") != NULL; | |
2042 | dev = hasmntopt(mntent, "dev") != NULL; | |
181437fd | 2043 | relative = hasmntopt(mntent, "relative") != NULL; |
d8b712bc | 2044 | |
ec50007f CB |
2045 | if (rootfs && rootfs->path) |
2046 | rootfs_path = rootfs->mount; | |
2047 | ||
d8b712bc CB |
2048 | ret = mount_entry_create_dir_file(mntent, path, rootfs, lxc_name, |
2049 | lxc_path); | |
2050 | if (ret < 0) { | |
2051 | if (optional) | |
2052 | return 0; | |
608e3567 | 2053 | |
d8b712bc CB |
2054 | return -1; |
2055 | } | |
4e4ca161 SH |
2056 | cull_mntent_opt(mntent); |
2057 | ||
d8b712bc CB |
2058 | ret = parse_mntopts(mntent->mnt_opts, &mntflags, &mntdata); |
2059 | if (ret < 0) | |
a17b1e65 | 2060 | return -1; |
a17b1e65 | 2061 | |
6e46cc0d | 2062 | ret = mount_entry(mntent->mnt_fsname, path, mntent->mnt_type, mntflags, |
181437fd | 2063 | mntdata, optional, dev, relative, rootfs_path); |
68c152ef | 2064 | |
911324ef | 2065 | free(mntdata); |
911324ef DL |
2066 | return ret; |
2067 | } | |
2068 | ||
db4aba38 NC |
2069 | static inline int mount_entry_on_systemfs(struct mntent *mntent) |
2070 | { | |
1433c9f9 | 2071 | int ret; |
07667a6a | 2072 | char path[MAXPATHLEN]; |
1433c9f9 CB |
2073 | |
2074 | /* For containers created without a rootfs all mounts are treated as | |
07667a6a CB |
2075 | * absolute paths starting at / on the host. |
2076 | */ | |
1433c9f9 CB |
2077 | if (mntent->mnt_dir[0] != '/') |
2078 | ret = snprintf(path, sizeof(path), "/%s", mntent->mnt_dir); | |
2079 | else | |
2080 | ret = snprintf(path, sizeof(path), "%s", mntent->mnt_dir); | |
07667a6a | 2081 | if (ret < 0 || ret >= sizeof(path)) |
1433c9f9 | 2082 | return -1; |
1433c9f9 CB |
2083 | |
2084 | return mount_entry_on_generic(mntent, path, NULL, NULL, NULL); | |
db4aba38 NC |
2085 | } |
2086 | ||
4e4ca161 | 2087 | static int mount_entry_on_absolute_rootfs(struct mntent *mntent, |
80a881b2 | 2088 | const struct lxc_rootfs *rootfs, |
0a2dddd4 CB |
2089 | const char *lxc_name, |
2090 | const char *lxc_path) | |
911324ef | 2091 | { |
bdd2b34c | 2092 | int offset; |
013bd428 | 2093 | char *aux; |
67e571de | 2094 | const char *lxcpath; |
bdd2b34c CB |
2095 | char path[MAXPATHLEN]; |
2096 | int ret = 0; | |
0ad19a3f | 2097 | |
593e8478 | 2098 | lxcpath = lxc_global_config_value("lxc.lxcpath"); |
bdd2b34c | 2099 | if (!lxcpath) |
2a59a681 | 2100 | return -1; |
2a59a681 | 2101 | |
bdd2b34c CB |
2102 | /* If rootfs->path is a blockdev path, allow container fstab to use |
2103 | * <lxcpath>/<name>/rootfs" as the target prefix. | |
2104 | */ | |
2105 | ret = snprintf(path, MAXPATHLEN, "%s/%s/rootfs", lxcpath, lxc_name); | |
2106 | if (ret < 0 || ret >= MAXPATHLEN) | |
80a881b2 SH |
2107 | goto skipvarlib; |
2108 | ||
2109 | aux = strstr(mntent->mnt_dir, path); | |
2110 | if (aux) { | |
2111 | offset = strlen(path); | |
2112 | goto skipabs; | |
2113 | } | |
2114 | ||
2115 | skipvarlib: | |
013bd428 DL |
2116 | aux = strstr(mntent->mnt_dir, rootfs->path); |
2117 | if (!aux) { | |
bdd2b34c | 2118 | WARN("Ignoring mount point \"%s\"", mntent->mnt_dir); |
db4aba38 | 2119 | return ret; |
013bd428 | 2120 | } |
80a881b2 SH |
2121 | offset = strlen(rootfs->path); |
2122 | ||
2123 | skipabs: | |
bdd2b34c CB |
2124 | ret = snprintf(path, MAXPATHLEN, "%s/%s", rootfs->mount, aux + offset); |
2125 | if (ret < 0 || ret >= MAXPATHLEN) | |
a17b1e65 | 2126 | return -1; |
a17b1e65 | 2127 | |
0a2dddd4 | 2128 | return mount_entry_on_generic(mntent, path, rootfs, lxc_name, lxc_path); |
911324ef | 2129 | } |
d330fe7b | 2130 | |
4e4ca161 | 2131 | static int mount_entry_on_relative_rootfs(struct mntent *mntent, |
0a2dddd4 CB |
2132 | const struct lxc_rootfs *rootfs, |
2133 | const char *lxc_name, | |
2134 | const char *lxc_path) | |
911324ef DL |
2135 | { |
2136 | char path[MAXPATHLEN]; | |
911324ef | 2137 | int ret; |
d330fe7b | 2138 | |
34cfffb3 | 2139 | /* relative to root mount point */ |
6e46cc0d | 2140 | ret = snprintf(path, sizeof(path), "%s/%s", rootfs->mount, mntent->mnt_dir); |
1433c9f9 | 2141 | if (ret < 0 || ret >= sizeof(path)) { |
9ba8130c SH |
2142 | ERROR("path name too long"); |
2143 | return -1; | |
2144 | } | |
911324ef | 2145 | |
0a2dddd4 | 2146 | return mount_entry_on_generic(mntent, path, rootfs, lxc_name, lxc_path); |
911324ef DL |
2147 | } |
2148 | ||
06749971 CB |
2149 | /* This logs a NOTICE() when a user specifies mounts that would conflict with |
2150 | * devices liblxc sets up automatically. | |
2151 | */ | |
2152 | static void log_notice_on_conflict(const struct lxc_conf *conf, const char *src, | |
2153 | const char *dest) | |
2154 | { | |
2155 | char *clean_mnt_fsname, *clean_mnt_dir, *tmp; | |
2156 | bool needs_warning = false; | |
2157 | ||
2158 | clean_mnt_fsname = lxc_deslashify(src); | |
2159 | if (!clean_mnt_fsname) | |
2160 | return; | |
2161 | ||
2162 | clean_mnt_dir = lxc_deslashify(dest); | |
2163 | if (!clean_mnt_dir) { | |
2164 | free(clean_mnt_fsname); | |
2165 | return; | |
2166 | } | |
2167 | ||
2168 | tmp = clean_mnt_dir; | |
2169 | if (*tmp == '/') | |
2170 | tmp++; | |
2171 | ||
2172 | if (strncmp(src, "/dev", 4) || strncmp(tmp, "dev", 3)) { | |
2173 | free(clean_mnt_dir); | |
2174 | free(clean_mnt_fsname); | |
2175 | return; | |
2176 | } | |
2177 | ||
2178 | if (!conf->autodev && !conf->pts && !conf->tty && | |
2179 | (!conf->console.path || !strcmp(conf->console.path, "none"))) { | |
2180 | free(clean_mnt_dir); | |
2181 | free(clean_mnt_fsname); | |
2182 | return; | |
2183 | } | |
2184 | ||
2185 | if (!strcmp(tmp, "dev") && conf->autodev > 0) | |
2186 | needs_warning = true; | |
2187 | else if (!strcmp(tmp, "dev/pts") && (conf->autodev > 0 || conf->pts > 0)) | |
2188 | needs_warning = true; | |
2189 | else if (!strcmp(tmp, "dev/ptmx") && (conf->autodev > 0 || conf->pts > 0)) | |
2190 | needs_warning = true; | |
2191 | else if (!strcmp(tmp, "dev/pts/ptmx") && (conf->autodev > 0 || conf->pts > 0)) | |
2192 | needs_warning = true; | |
2193 | else if (!strcmp(tmp, "dev/null") && conf->autodev > 0) | |
2194 | needs_warning = true; | |
2195 | else if (!strcmp(tmp, "dev/zero") && conf->autodev > 0) | |
2196 | needs_warning = true; | |
2197 | else if (!strcmp(tmp, "dev/full") && conf->autodev > 0) | |
2198 | needs_warning = true; | |
2199 | else if (!strcmp(tmp, "dev/urandom") && conf->autodev > 0) | |
2200 | needs_warning = true; | |
2201 | else if (!strcmp(tmp, "dev/random") && conf->autodev > 0) | |
2202 | needs_warning = true; | |
2203 | else if (!strcmp(tmp, "dev/tty") && conf->autodev > 0) | |
2204 | needs_warning = true; | |
2205 | else if (!strncmp(tmp, "dev/tty", 7) && (conf->autodev > 0 || conf->tty > 0)) | |
2206 | needs_warning = true; | |
2207 | ||
2208 | if (needs_warning) | |
2209 | NOTICE("Requesting to mount \"%s\" on \"%s\" while requesting " | |
2210 | "automatic device setup under \"/dev\"", | |
2211 | clean_mnt_fsname, clean_mnt_dir); | |
2212 | ||
2213 | free(clean_mnt_dir); | |
2214 | free(clean_mnt_fsname); | |
2215 | } | |
2216 | ||
2217 | static int mount_file_entries(const struct lxc_conf *conf, | |
2218 | const struct lxc_rootfs *rootfs, FILE *file, | |
1ae3c19f | 2219 | const char *lxc_name, const char *lxc_path) |
911324ef | 2220 | { |
aaf901be AM |
2221 | struct mntent mntent; |
2222 | char buf[4096]; | |
911324ef | 2223 | int ret = -1; |
e76b8764 | 2224 | |
aaf901be | 2225 | while (getmntent_r(file, &mntent, buf, sizeof(buf))) { |
06749971 CB |
2226 | log_notice_on_conflict(conf, mntent.mnt_fsname, mntent.mnt_dir); |
2227 | ||
1ae3c19f CB |
2228 | if (!rootfs->path) |
2229 | ret = mount_entry_on_systemfs(&mntent); | |
2230 | else if (mntent.mnt_dir[0] != '/') | |
2231 | ret = mount_entry_on_relative_rootfs(&mntent, rootfs, | |
2232 | lxc_name, lxc_path); | |
2233 | else | |
2234 | ret = mount_entry_on_absolute_rootfs(&mntent, rootfs, | |
2235 | lxc_name, lxc_path); | |
2236 | if (ret < 0) | |
2237 | return -1; | |
0ad19a3f | 2238 | } |
2239 | ret = 0; | |
cd54d859 | 2240 | |
1ae3c19f | 2241 | INFO("Set up mount entries"); |
e7938e9e MN |
2242 | return ret; |
2243 | } | |
2244 | ||
06749971 CB |
2245 | static int setup_mount(const struct lxc_conf *conf, |
2246 | const struct lxc_rootfs *rootfs, const char *fstab, | |
42dff448 | 2247 | const char *lxc_name, const char *lxc_path) |
e7938e9e | 2248 | { |
42dff448 | 2249 | FILE *f; |
e7938e9e MN |
2250 | int ret; |
2251 | ||
2252 | if (!fstab) | |
2253 | return 0; | |
2254 | ||
42dff448 CB |
2255 | f = setmntent(fstab, "r"); |
2256 | if (!f) { | |
2257 | SYSERROR("Failed to open \"%s\"", fstab); | |
e7938e9e MN |
2258 | return -1; |
2259 | } | |
2260 | ||
06749971 | 2261 | ret = mount_file_entries(conf, rootfs, f, lxc_name, lxc_path); |
42dff448 CB |
2262 | if (ret < 0) |
2263 | ERROR("Failed to set up mount entries"); | |
e7938e9e | 2264 | |
42dff448 | 2265 | endmntent(f); |
0ad19a3f | 2266 | return ret; |
2267 | } | |
2268 | ||
5ef5c9a3 | 2269 | FILE *make_anonymous_mount_file(struct lxc_list *mount) |
e7938e9e | 2270 | { |
5ef5c9a3 | 2271 | int ret; |
e7938e9e | 2272 | char *mount_entry; |
5ef5c9a3 | 2273 | struct lxc_list *iterator; |
6bd04140 | 2274 | FILE *f; |
5ef5c9a3 CB |
2275 | int fd = -1; |
2276 | ||
2277 | fd = memfd_create("lxc_mount_file", MFD_CLOEXEC); | |
2278 | if (fd < 0) { | |
2279 | if (errno != ENOSYS) | |
2280 | return NULL; | |
6bd04140 CB |
2281 | f = tmpfile(); |
2282 | TRACE("Created temporary mount file"); | |
5ef5c9a3 | 2283 | } else { |
6bd04140 CB |
2284 | f = fdopen(fd, "r+"); |
2285 | TRACE("Created anonymous mount file"); | |
5ef5c9a3 | 2286 | } |
e7938e9e | 2287 | |
6bd04140 CB |
2288 | if (!f) { |
2289 | SYSERROR("Could not create mount file"); | |
5ef5c9a3 CB |
2290 | if (fd != -1) |
2291 | close(fd); | |
9fc7f8c0 | 2292 | return NULL; |
e7938e9e MN |
2293 | } |
2294 | ||
2295 | lxc_list_for_each(iterator, mount) { | |
2296 | mount_entry = iterator->elem; | |
6bd04140 | 2297 | ret = fprintf(f, "%s\n", mount_entry); |
5ef5c9a3 | 2298 | if (ret < strlen(mount_entry)) |
6bd04140 | 2299 | WARN("Could not write mount entry to mount file"); |
5ef5c9a3 CB |
2300 | } |
2301 | ||
6bd04140 CB |
2302 | ret = fseek(f, 0, SEEK_SET); |
2303 | if (ret < 0) { | |
2304 | SYSERROR("Failed to seek mount file"); | |
2305 | fclose(f); | |
5ef5c9a3 | 2306 | return NULL; |
e7938e9e MN |
2307 | } |
2308 | ||
6bd04140 | 2309 | return f; |
9fc7f8c0 TA |
2310 | } |
2311 | ||
06749971 CB |
2312 | static int setup_mount_entries(const struct lxc_conf *conf, |
2313 | const struct lxc_rootfs *rootfs, | |
5ef5c9a3 CB |
2314 | struct lxc_list *mount, const char *lxc_name, |
2315 | const char *lxc_path) | |
9fc7f8c0 | 2316 | { |
19b5d755 | 2317 | FILE *f; |
9fc7f8c0 TA |
2318 | int ret; |
2319 | ||
19b5d755 CB |
2320 | f = make_anonymous_mount_file(mount); |
2321 | if (!f) | |
9fc7f8c0 | 2322 | return -1; |
e7938e9e | 2323 | |
06749971 | 2324 | ret = mount_file_entries(conf, rootfs, f, lxc_name, lxc_path); |
e7938e9e | 2325 | |
19b5d755 | 2326 | fclose(f); |
e7938e9e MN |
2327 | return ret; |
2328 | } | |
2329 | ||
bab88e68 CS |
2330 | static int parse_cap(const char *cap) |
2331 | { | |
2332 | char *ptr = NULL; | |
84760c11 | 2333 | size_t i; |
2334 | int capid = -1; | |
bab88e68 | 2335 | |
7035407c DE |
2336 | if (!strcmp(cap, "none")) |
2337 | return -2; | |
2338 | ||
bab88e68 CS |
2339 | for (i = 0; i < sizeof(caps_opt)/sizeof(caps_opt[0]); i++) { |
2340 | ||
2341 | if (strcmp(cap, caps_opt[i].name)) | |
2342 | continue; | |
2343 | ||
2344 | capid = caps_opt[i].value; | |
2345 | break; | |
2346 | } | |
2347 | ||
2348 | if (capid < 0) { | |
2349 | /* try to see if it's numeric, so the user may specify | |
2350 | * capabilities that the running kernel knows about but | |
2351 | * we don't */ | |
2352 | errno = 0; | |
2353 | capid = strtol(cap, &ptr, 10); | |
2354 | if (!ptr || *ptr != '\0' || errno != 0) | |
2355 | /* not a valid number */ | |
2356 | capid = -1; | |
2357 | else if (capid > lxc_caps_last_cap()) | |
2358 | /* we have a number but it's not a valid | |
2359 | * capability */ | |
2360 | capid = -1; | |
2361 | } | |
2362 | ||
2363 | return capid; | |
2364 | } | |
2365 | ||
0769b82a CS |
2366 | int in_caplist(int cap, struct lxc_list *caps) |
2367 | { | |
2368 | struct lxc_list *iterator; | |
2369 | int capid; | |
2370 | ||
2371 | lxc_list_for_each(iterator, caps) { | |
2372 | capid = parse_cap(iterator->elem); | |
2373 | if (capid == cap) | |
2374 | return 1; | |
2375 | } | |
2376 | ||
2377 | return 0; | |
2378 | } | |
2379 | ||
81810dd1 DL |
2380 | static int setup_caps(struct lxc_list *caps) |
2381 | { | |
2382 | struct lxc_list *iterator; | |
2383 | char *drop_entry; | |
bab88e68 | 2384 | int capid; |
81810dd1 DL |
2385 | |
2386 | lxc_list_for_each(iterator, caps) { | |
2387 | ||
2388 | drop_entry = iterator->elem; | |
2389 | ||
bab88e68 | 2390 | capid = parse_cap(drop_entry); |
d55bc1ad | 2391 | |
81810dd1 | 2392 | if (capid < 0) { |
1e11be34 DL |
2393 | ERROR("unknown capability %s", drop_entry); |
2394 | return -1; | |
81810dd1 DL |
2395 | } |
2396 | ||
2397 | DEBUG("drop capability '%s' (%d)", drop_entry, capid); | |
2398 | ||
2399 | if (prctl(PR_CAPBSET_DROP, capid, 0, 0, 0)) { | |
3ec1648d SH |
2400 | SYSERROR("failed to remove %s capability", drop_entry); |
2401 | return -1; | |
2402 | } | |
81810dd1 DL |
2403 | |
2404 | } | |
2405 | ||
1fb86a7c SH |
2406 | DEBUG("capabilities have been setup"); |
2407 | ||
2408 | return 0; | |
2409 | } | |
2410 | ||
2411 | static int dropcaps_except(struct lxc_list *caps) | |
2412 | { | |
2413 | struct lxc_list *iterator; | |
2414 | char *keep_entry; | |
1fb86a7c SH |
2415 | int i, capid; |
2416 | int numcaps = lxc_caps_last_cap() + 1; | |
959aee9c | 2417 | INFO("found %d capabilities", numcaps); |
1fb86a7c | 2418 | |
2caf9a97 SH |
2419 | if (numcaps <= 0 || numcaps > 200) |
2420 | return -1; | |
2421 | ||
1a0e70ac | 2422 | /* caplist[i] is 1 if we keep capability i */ |
1fb86a7c SH |
2423 | int *caplist = alloca(numcaps * sizeof(int)); |
2424 | memset(caplist, 0, numcaps * sizeof(int)); | |
2425 | ||
2426 | lxc_list_for_each(iterator, caps) { | |
2427 | ||
2428 | keep_entry = iterator->elem; | |
2429 | ||
bab88e68 | 2430 | capid = parse_cap(keep_entry); |
1fb86a7c | 2431 | |
7035407c DE |
2432 | if (capid == -2) |
2433 | continue; | |
2434 | ||
1fb86a7c SH |
2435 | if (capid < 0) { |
2436 | ERROR("unknown capability %s", keep_entry); | |
2437 | return -1; | |
2438 | } | |
2439 | ||
8255688a | 2440 | DEBUG("keep capability '%s' (%d)", keep_entry, capid); |
1fb86a7c SH |
2441 | |
2442 | caplist[capid] = 1; | |
2443 | } | |
2444 | for (i=0; i<numcaps; i++) { | |
2445 | if (caplist[i]) | |
2446 | continue; | |
2447 | if (prctl(PR_CAPBSET_DROP, i, 0, 0, 0)) { | |
3ec1648d SH |
2448 | SYSERROR("failed to remove capability %d", i); |
2449 | return -1; | |
2450 | } | |
1fb86a7c SH |
2451 | } |
2452 | ||
2453 | DEBUG("capabilities have been setup"); | |
81810dd1 DL |
2454 | |
2455 | return 0; | |
2456 | } | |
2457 | ||
c6d09e15 WB |
2458 | static int parse_resource(const char *res) { |
2459 | size_t i; | |
2460 | int resid = -1; | |
2461 | ||
2462 | for (i = 0; i < sizeof(limit_opt)/sizeof(limit_opt[0]); ++i) { | |
2463 | if (strcmp(res, limit_opt[i].name) == 0) | |
2464 | return limit_opt[i].value; | |
2465 | } | |
2466 | ||
2467 | /* try to see if it's numeric, so the user may specify | |
2468 | * resources that the running kernel knows about but | |
2469 | * we don't */ | |
2470 | if (lxc_safe_int(res, &resid) == 0) | |
2471 | return resid; | |
2472 | return -1; | |
2473 | } | |
2474 | ||
2475 | int setup_resource_limits(struct lxc_list *limits, pid_t pid) { | |
2476 | struct lxc_list *it; | |
2477 | struct lxc_limit *lim; | |
2478 | int resid; | |
2479 | ||
2480 | lxc_list_for_each(it, limits) { | |
2481 | lim = it->elem; | |
2482 | ||
2483 | resid = parse_resource(lim->resource); | |
2484 | if (resid < 0) { | |
2485 | ERROR("unknown resource %s", lim->resource); | |
2486 | return -1; | |
2487 | } | |
2488 | ||
f48b5fd8 | 2489 | #if HAVE_PRLIMIT || HAVE_PRLIMIT64 |
c6d09e15 WB |
2490 | if (prlimit(pid, resid, &lim->limit, NULL) != 0) { |
2491 | ERROR("failed to set limit %s: %s", lim->resource, strerror(errno)); | |
2492 | return -1; | |
2493 | } | |
f48b5fd8 FF |
2494 | #else |
2495 | ERROR("Cannot set limit %s as prlimit is missing", lim->resource); | |
2496 | return -1; | |
2497 | #endif | |
c6d09e15 WB |
2498 | } |
2499 | return 0; | |
2500 | } | |
2501 | ||
7edd0540 L |
2502 | int setup_sysctl_parameters(struct lxc_list *sysctls) |
2503 | { | |
2504 | struct lxc_list *it; | |
2505 | struct lxc_sysctl *elem; | |
2506 | char *tmp = NULL; | |
2507 | char filename[MAXPATHLEN] = {0}; | |
2508 | int ret = 0; | |
2509 | ||
2510 | lxc_list_for_each(it, sysctls) { | |
2511 | elem = it->elem; | |
2512 | tmp = lxc_string_replace(".", "/", elem->key); | |
2513 | if (!tmp) { | |
2514 | ERROR("Failed to replace key %s", elem->key); | |
2515 | return -1; | |
2516 | } | |
2517 | ||
2518 | ret = snprintf(filename, sizeof(filename), "/proc/sys/%s", tmp); | |
2519 | free(tmp); | |
2520 | if (ret < 0 || (size_t)ret >= sizeof(filename)) { | |
2521 | ERROR("Error setting up sysctl parameters path"); | |
2522 | return -1; | |
2523 | } | |
2524 | ||
2525 | ret = lxc_write_to_file(filename, elem->value, strlen(elem->value), false); | |
2526 | if (ret < 0) { | |
2527 | ERROR("Failed to setup sysctl parameters %s to %s", elem->key, elem->value); | |
2528 | return -1; | |
2529 | } | |
2530 | } | |
2531 | return 0; | |
2532 | } | |
2533 | ||
61d7a733 YT |
2534 | int setup_proc_filesystem(struct lxc_list *procs, pid_t pid) |
2535 | { | |
2536 | struct lxc_list *it; | |
2537 | struct lxc_proc *elem; | |
2538 | char *tmp = NULL; | |
2539 | char filename[MAXPATHLEN] = {0}; | |
2540 | int ret = 0; | |
2541 | ||
2542 | lxc_list_for_each(it, procs) { | |
2543 | elem = it->elem; | |
2544 | tmp = lxc_string_replace(".", "/", elem->filename); | |
2545 | if (!tmp) { | |
2546 | ERROR("Failed to replace key %s", elem->filename); | |
2547 | return -1; | |
2548 | } | |
2549 | ||
2550 | ret = snprintf(filename, sizeof(filename), "/proc/%d/%s", pid, tmp); | |
2551 | free(tmp); | |
2552 | if (ret < 0 || (size_t)ret >= sizeof(filename)) { | |
2553 | ERROR("Error setting up proc filesystem path"); | |
2554 | return -1; | |
2555 | } | |
2556 | ||
2557 | ret = lxc_write_to_file(filename, elem->value, strlen(elem->value), false); | |
2558 | if (ret < 0) { | |
2559 | ERROR("Failed to setup proc filesystem %s to %s", elem->filename, elem->value); | |
2560 | return -1; | |
2561 | } | |
2562 | } | |
2563 | return 0; | |
2564 | } | |
2565 | ||
ae9242c8 SH |
2566 | static char *default_rootfs_mount = LXCROOTFSMOUNT; |
2567 | ||
7b379ab3 | 2568 | struct lxc_conf *lxc_conf_init(void) |
089cd8b8 | 2569 | { |
7b379ab3 | 2570 | struct lxc_conf *new; |
26ddeedd | 2571 | int i; |
7b379ab3 | 2572 | |
13277ec4 | 2573 | new = malloc(sizeof(*new)); |
7b379ab3 | 2574 | if (!new) { |
13277ec4 | 2575 | ERROR("lxc_conf_init : %s", strerror(errno)); |
7b379ab3 MN |
2576 | return NULL; |
2577 | } | |
2578 | memset(new, 0, sizeof(*new)); | |
2579 | ||
4b73005c | 2580 | new->loglevel = LXC_LOG_LEVEL_NOTSET; |
cccc74b5 | 2581 | new->personality = -1; |
124fa0a8 | 2582 | new->autodev = 1; |
3a784510 CB |
2583 | new->console.buffer_log_file = NULL; |
2584 | new->console.buffer_log_file_fd = -1; | |
2585 | new->console.buffer_size = 0; | |
596a818d DE |
2586 | new->console.log_path = NULL; |
2587 | new->console.log_fd = -1; | |
28a4b0e5 | 2588 | new->console.path = NULL; |
63376d7d | 2589 | new->console.peer = -1; |
b5159817 DE |
2590 | new->console.peerpty.busy = -1; |
2591 | new->console.peerpty.master = -1; | |
2592 | new->console.peerpty.slave = -1; | |
63376d7d DL |
2593 | new->console.master = -1; |
2594 | new->console.slave = -1; | |
2595 | new->console.name[0] = '\0'; | |
732375f5 | 2596 | memset(&new->console.ringbuf, 0, sizeof(struct lxc_ringbuf)); |
d2e30e99 | 2597 | new->maincmd_fd = -1; |
76a26f55 | 2598 | new->nbd_idx = -1; |
54c30e29 | 2599 | new->rootfs.mount = strdup(default_rootfs_mount); |
53f3f048 | 2600 | if (!new->rootfs.mount) { |
13277ec4 | 2601 | ERROR("lxc_conf_init : %s", strerror(errno)); |
53f3f048 SH |
2602 | free(new); |
2603 | return NULL; | |
2604 | } | |
858377e4 | 2605 | new->logfd = -1; |
7b379ab3 MN |
2606 | lxc_list_init(&new->cgroup); |
2607 | lxc_list_init(&new->network); | |
2608 | lxc_list_init(&new->mount_list); | |
81810dd1 | 2609 | lxc_list_init(&new->caps); |
1fb86a7c | 2610 | lxc_list_init(&new->keepcaps); |
f6d3e3e4 | 2611 | lxc_list_init(&new->id_map); |
46ad64ab CB |
2612 | new->root_nsuid_map = NULL; |
2613 | new->root_nsgid_map = NULL; | |
f979ac15 | 2614 | lxc_list_init(&new->includes); |
4184c3e1 | 2615 | lxc_list_init(&new->aliens); |
7c661726 | 2616 | lxc_list_init(&new->environment); |
c6d09e15 | 2617 | lxc_list_init(&new->limits); |
7edd0540 | 2618 | lxc_list_init(&new->sysctls); |
61d7a733 | 2619 | lxc_list_init(&new->procs); |
44ae0fb6 | 2620 | new->hooks_version = 0; |
28d9e29e | 2621 | for (i = 0; i < NUM_LXC_HOOKS; i++) |
26ddeedd | 2622 | lxc_list_init(&new->hooks[i]); |
ee1e7aa0 | 2623 | lxc_list_init(&new->groups); |
d39b10eb | 2624 | lxc_list_init(&new->state_clients); |
fe4de9a6 DE |
2625 | new->lsm_aa_profile = NULL; |
2626 | new->lsm_se_context = NULL; | |
5112cd70 | 2627 | new->tmp_umount_proc = 0; |
7b379ab3 | 2628 | |
72bb04e4 PT |
2629 | /* if running in a new user namespace, init and COMMAND |
2630 | * default to running as UID/GID 0 when using lxc-execute */ | |
2631 | new->init_uid = 0; | |
2632 | new->init_gid = 0; | |
43654d34 | 2633 | memset(&new->cgroup_meta, 0, sizeof(struct lxc_cgroup)); |
28d9e29e | 2634 | memset(&new->inherit_ns, 0, sizeof(char *) * LXC_NS_MAX); |
72bb04e4 | 2635 | |
7b379ab3 | 2636 | return new; |
089cd8b8 DL |
2637 | } |
2638 | ||
344c9d81 | 2639 | int write_id_mapping(enum idtype idtype, pid_t pid, const char *buf, |
a19b974f | 2640 | size_t buf_size) |
f6d3e3e4 | 2641 | { |
29053180 CB |
2642 | char path[MAXPATHLEN]; |
2643 | int fd, ret; | |
f6d3e3e4 | 2644 | |
a19b974f CB |
2645 | if (geteuid() != 0 && idtype == ID_TYPE_GID) { |
2646 | size_t buflen; | |
2647 | ||
2648 | ret = snprintf(path, MAXPATHLEN, "/proc/%d/setgroups", pid); | |
2649 | if (ret < 0 || ret >= MAXPATHLEN) { | |
2650 | ERROR("Failed to create string"); | |
2651 | return -E2BIG; | |
2652 | } | |
2653 | ||
2654 | fd = open(path, O_WRONLY); | |
2655 | if (fd < 0 && errno != ENOENT) { | |
2656 | SYSERROR("Failed to open \"%s\"", path); | |
2657 | return -1; | |
2658 | } | |
2659 | ||
2660 | buflen = sizeof("deny\n") - 1; | |
2661 | errno = 0; | |
2662 | ret = lxc_write_nointr(fd, "deny\n", buflen); | |
2663 | if (ret != buflen) { | |
2664 | SYSERROR("Failed to write \"deny\" to \"/proc/%d/setgroups\"", pid); | |
2665 | close(fd); | |
2666 | return -1; | |
2667 | } | |
2668 | close(fd); | |
2669 | } | |
2670 | ||
29053180 CB |
2671 | ret = snprintf(path, MAXPATHLEN, "/proc/%d/%cid_map", pid, |
2672 | idtype == ID_TYPE_UID ? 'u' : 'g'); | |
2673 | if (ret < 0 || ret >= MAXPATHLEN) { | |
a19b974f | 2674 | ERROR("Failed to create string"); |
f6d3e3e4 SH |
2675 | return -E2BIG; |
2676 | } | |
29053180 CB |
2677 | |
2678 | fd = open(path, O_WRONLY); | |
2679 | if (fd < 0) { | |
a19b974f | 2680 | SYSERROR("Failed to open \"%s\"", path); |
29053180 | 2681 | return -1; |
f6d3e3e4 | 2682 | } |
29053180 CB |
2683 | |
2684 | errno = 0; | |
2685 | ret = lxc_write_nointr(fd, buf, buf_size); | |
2686 | if (ret != buf_size) { | |
a19b974f | 2687 | SYSERROR("Failed to write %cid mapping to \"%s\"", |
29053180 CB |
2688 | idtype == ID_TYPE_UID ? 'u' : 'g', path); |
2689 | close(fd); | |
2690 | return -1; | |
2691 | } | |
2692 | close(fd); | |
2693 | ||
2694 | return 0; | |
f6d3e3e4 SH |
2695 | } |
2696 | ||
6e50e704 CB |
2697 | /* Check whether a binary exist and has either CAP_SETUID, CAP_SETGID or both. |
2698 | * | |
2699 | * @return 1 if functional binary was found | |
2700 | * @return 0 if binary exists but is lacking privilege | |
2701 | * @return -ENOENT if binary does not exist | |
2702 | * @return -EINVAL if cap to check is neither CAP_SETUID nor CAP_SETGID | |
2703 | * | |
2704 | */ | |
df6a2945 CB |
2705 | static int idmaptool_on_path_and_privileged(const char *binary, cap_value_t cap) |
2706 | { | |
2707 | char *path; | |
2708 | int ret; | |
2709 | struct stat st; | |
2710 | int fret = 0; | |
2711 | ||
6e50e704 CB |
2712 | if (cap != CAP_SETUID && cap != CAP_SETGID) |
2713 | return -EINVAL; | |
2714 | ||
df6a2945 CB |
2715 | path = on_path(binary, NULL); |
2716 | if (!path) | |
2717 | return -ENOENT; | |
2718 | ||
2719 | ret = stat(path, &st); | |
2720 | if (ret < 0) { | |
2721 | fret = -errno; | |
2722 | goto cleanup; | |
2723 | } | |
2724 | ||
2725 | /* Check if the binary is setuid. */ | |
2726 | if (st.st_mode & S_ISUID) { | |
2727 | DEBUG("The binary \"%s\" does have the setuid bit set.", path); | |
2728 | fret = 1; | |
2729 | goto cleanup; | |
2730 | } | |
2731 | ||
69924fff | 2732 | #if HAVE_LIBCAP && LIBCAP_SUPPORTS_FILE_CAPABILITIES |
df6a2945 CB |
2733 | /* Check if it has the CAP_SETUID capability. */ |
2734 | if ((cap & CAP_SETUID) && | |
2735 | lxc_file_cap_is_set(path, CAP_SETUID, CAP_EFFECTIVE) && | |
2736 | lxc_file_cap_is_set(path, CAP_SETUID, CAP_PERMITTED)) { | |
2737 | DEBUG("The binary \"%s\" has CAP_SETUID in its CAP_EFFECTIVE " | |
2738 | "and CAP_PERMITTED sets.", path); | |
2739 | fret = 1; | |
2740 | goto cleanup; | |
2741 | } | |
2742 | ||
2743 | /* Check if it has the CAP_SETGID capability. */ | |
2744 | if ((cap & CAP_SETGID) && | |
2745 | lxc_file_cap_is_set(path, CAP_SETGID, CAP_EFFECTIVE) && | |
2746 | lxc_file_cap_is_set(path, CAP_SETGID, CAP_PERMITTED)) { | |
2747 | DEBUG("The binary \"%s\" has CAP_SETGID in its CAP_EFFECTIVE " | |
2748 | "and CAP_PERMITTED sets.", path); | |
2749 | fret = 1; | |
2750 | goto cleanup; | |
2751 | } | |
d6018f88 | 2752 | #else |
69924fff CB |
2753 | /* If we cannot check for file capabilities we need to give the benefit |
2754 | * of the doubt. Otherwise we might fail even though all the necessary | |
2755 | * file capabilities are set. | |
2756 | */ | |
d6018f88 CB |
2757 | DEBUG("Cannot check for file capabilites as full capability support is " |
2758 | "missing. Manual intervention needed."); | |
2759 | fret = 1; | |
df6a2945 CB |
2760 | #endif |
2761 | ||
2762 | cleanup: | |
2763 | free(path); | |
2764 | return fret; | |
2765 | } | |
2766 | ||
986ef930 CB |
2767 | int lxc_map_ids_exec_wrapper(void *args) |
2768 | { | |
2769 | execl("/bin/sh", "sh", "-c", (char *)args, (char *)NULL); | |
2770 | return -1; | |
2771 | } | |
2772 | ||
f6d3e3e4 SH |
2773 | int lxc_map_ids(struct lxc_list *idmap, pid_t pid) |
2774 | { | |
f6d3e3e4 | 2775 | struct id_map *map; |
4bc3b759 | 2776 | struct lxc_list *iterator; |
251d0d2a | 2777 | enum idtype type; |
986ef930 | 2778 | char u_or_g; |
4bc3b759 | 2779 | char *pos; |
99d43365 | 2780 | int fill, left; |
986ef930 CB |
2781 | char cmd_output[MAXPATHLEN]; |
2782 | /* strlen("new@idmap") = 9 | |
2783 | * + | |
2784 | * strlen(" ") = 1 | |
2785 | * + | |
2786 | * LXC_NUMSTRLEN64 | |
2787 | * + | |
2788 | * strlen(" ") = 1 | |
2789 | * | |
2790 | * We add some additional space to make sure that we really have | |
2791 | * LXC_IDMAPLEN bytes available for our the {g,u]id mapping. | |
2792 | */ | |
2793 | char mapbuf[9 + 1 + LXC_NUMSTRLEN64 + 1 + LXC_IDMAPLEN] = {0}; | |
2794 | int ret = 0, uidmap = 0, gidmap = 0; | |
2795 | bool use_shadow = false, had_entry = false; | |
df6a2945 CB |
2796 | |
2797 | /* If new{g,u}idmap exists, that is, if shadow is handing out subuid | |
2798 | * ranges, then insist that root also reserve ranges in subuid. This | |
22038de5 SH |
2799 | * will protected it by preventing another user from being handed the |
2800 | * range by shadow. | |
2801 | */ | |
df6a2945 | 2802 | uidmap = idmaptool_on_path_and_privileged("newuidmap", CAP_SETUID); |
6e50e704 CB |
2803 | if (uidmap == -ENOENT) |
2804 | WARN("newuidmap binary is missing"); | |
2805 | else if (!uidmap) | |
2806 | WARN("newuidmap is lacking necessary privileges"); | |
2807 | ||
df6a2945 | 2808 | gidmap = idmaptool_on_path_and_privileged("newgidmap", CAP_SETGID); |
6e50e704 CB |
2809 | if (gidmap == -ENOENT) |
2810 | WARN("newgidmap binary is missing"); | |
2811 | else if (!gidmap) | |
2812 | WARN("newgidmap is lacking necessary privileges"); | |
2813 | ||
df6a2945 CB |
2814 | if (uidmap > 0 && gidmap > 0) { |
2815 | DEBUG("Functional newuidmap and newgidmap binary found."); | |
4bc3b759 | 2816 | use_shadow = true; |
df6a2945 | 2817 | } else { |
99d43365 CB |
2818 | /* In case unprivileged users run application containers via |
2819 | * execute() or a start*() there are valid cases where they may | |
2820 | * only want to map their own {g,u}id. Let's not block them from | |
2821 | * doing so by requiring geteuid() == 0. | |
2822 | */ | |
2823 | DEBUG("No newuidmap and newgidmap binary found. Trying to " | |
2824 | "write directly with euid %d.", geteuid()); | |
0e6e3a41 | 2825 | } |
251d0d2a | 2826 | |
986ef930 CB |
2827 | for (type = ID_TYPE_UID, u_or_g = 'u'; type <= ID_TYPE_GID; |
2828 | type++, u_or_g = 'g') { | |
2829 | pos = mapbuf; | |
2830 | ||
0e6e3a41 | 2831 | if (use_shadow) |
986ef930 | 2832 | pos += sprintf(mapbuf, "new%cidmap %d", u_or_g, pid); |
4f7521b4 | 2833 | |
cf3ef16d | 2834 | lxc_list_for_each(iterator, idmap) { |
251d0d2a | 2835 | map = iterator->elem; |
cf3ef16d SH |
2836 | if (map->idtype != type) |
2837 | continue; | |
2838 | ||
4bc3b759 CB |
2839 | had_entry = true; |
2840 | ||
986ef930 | 2841 | left = LXC_IDMAPLEN - (pos - mapbuf); |
d1838f34 | 2842 | fill = snprintf(pos, left, "%s%lu %lu %lu%s", |
4bc3b759 CB |
2843 | use_shadow ? " " : "", map->nsid, |
2844 | map->hostid, map->range, | |
0e6e3a41 | 2845 | use_shadow ? "" : "\n"); |
a427e268 CB |
2846 | if (fill <= 0 || fill >= left) { |
2847 | /* The kernel only takes <= 4k for writes to | |
2848 | * /proc/<pid>/{g,u}id_map | |
2849 | */ | |
2850 | SYSERROR("Too many %cid mappings defined", u_or_g); | |
2851 | return -1; | |
2852 | } | |
4bc3b759 | 2853 | |
cf3ef16d | 2854 | pos += fill; |
251d0d2a | 2855 | } |
cf3ef16d | 2856 | if (!had_entry) |
4f7521b4 | 2857 | continue; |
cf3ef16d | 2858 | |
986ef930 CB |
2859 | /* Try to catch the ouput of new{g,u}idmap to make debugging |
2860 | * easier. | |
2861 | */ | |
2862 | if (use_shadow) { | |
2863 | ret = run_command(cmd_output, sizeof(cmd_output), | |
2864 | lxc_map_ids_exec_wrapper, | |
2865 | (void *)mapbuf); | |
2866 | if (ret < 0) { | |
54fbbeb5 CB |
2867 | ERROR("new%cidmap failed to write mapping \"%s\": %s", |
2868 | u_or_g, cmd_output, mapbuf); | |
986ef930 CB |
2869 | return -1; |
2870 | } | |
54fbbeb5 | 2871 | TRACE("new%cidmap wrote mapping \"%s\"", u_or_g, mapbuf); |
d1838f34 | 2872 | } else { |
986ef930 | 2873 | ret = write_id_mapping(type, pid, mapbuf, pos - mapbuf); |
54fbbeb5 | 2874 | if (ret < 0) { |
da0f9977 | 2875 | ERROR("Failed to write mapping: %s", mapbuf); |
986ef930 | 2876 | return -1; |
54fbbeb5 CB |
2877 | } |
2878 | TRACE("Wrote mapping \"%s\"", mapbuf); | |
d1838f34 | 2879 | } |
986ef930 CB |
2880 | |
2881 | memset(mapbuf, 0, sizeof(mapbuf)); | |
f6d3e3e4 | 2882 | } |
251d0d2a | 2883 | |
986ef930 | 2884 | return 0; |
f6d3e3e4 SH |
2885 | } |
2886 | ||
cf3ef16d | 2887 | /* |
7b50c609 TS |
2888 | * return the host uid/gid to which the container root is mapped in |
2889 | * *val. | |
0b3a6504 | 2890 | * Return true if id was found, false otherwise. |
cf3ef16d | 2891 | */ |
2a9a80cb | 2892 | bool get_mapped_rootid(struct lxc_conf *conf, enum idtype idtype, |
4160c3a0 | 2893 | unsigned long *val) |
cf3ef16d SH |
2894 | { |
2895 | struct lxc_list *it; | |
2896 | struct id_map *map; | |
4160c3a0 CB |
2897 | unsigned nsid; |
2898 | ||
2899 | if (idtype == ID_TYPE_UID) | |
2900 | nsid = (conf->root_nsuid_map != NULL) ? 0 : conf->init_uid; | |
2901 | else | |
2902 | nsid = (conf->root_nsgid_map != NULL) ? 0 : conf->init_gid; | |
cf3ef16d SH |
2903 | |
2904 | lxc_list_for_each(it, &conf->id_map) { | |
2905 | map = it->elem; | |
7b50c609 | 2906 | if (map->idtype != idtype) |
cf3ef16d | 2907 | continue; |
4160c3a0 | 2908 | if (map->nsid != nsid) |
cf3ef16d | 2909 | continue; |
2a9a80cb SH |
2910 | *val = map->hostid; |
2911 | return true; | |
cf3ef16d | 2912 | } |
4160c3a0 | 2913 | |
2a9a80cb | 2914 | return false; |
cf3ef16d SH |
2915 | } |
2916 | ||
2133f58c | 2917 | int mapped_hostid(unsigned id, struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d SH |
2918 | { |
2919 | struct lxc_list *it; | |
2920 | struct id_map *map; | |
2921 | lxc_list_for_each(it, &conf->id_map) { | |
2922 | map = it->elem; | |
2133f58c | 2923 | if (map->idtype != idtype) |
cf3ef16d SH |
2924 | continue; |
2925 | if (id >= map->hostid && id < map->hostid + map->range) | |
57d116ab | 2926 | return (id - map->hostid) + map->nsid; |
cf3ef16d | 2927 | } |
57d116ab | 2928 | return -1; |
cf3ef16d SH |
2929 | } |
2930 | ||
339efad9 | 2931 | int find_unmapped_nsid(struct lxc_conf *conf, enum idtype idtype) |
cf3ef16d SH |
2932 | { |
2933 | struct lxc_list *it; | |
2934 | struct id_map *map; | |
2133f58c | 2935 | unsigned int freeid = 0; |
cf3ef16d SH |
2936 | again: |
2937 | lxc_list_for_each(it, &conf->id_map) { | |
2938 | map = it->elem; | |
2133f58c | 2939 | if (map->idtype != idtype) |
cf3ef16d SH |
2940 | continue; |
2941 | if (freeid >= map->nsid && freeid < map->nsid + map->range) { | |
2942 | freeid = map->nsid + map->range; | |
2943 | goto again; | |
2944 | } | |
2945 | } | |
2946 | return freeid; | |
2947 | } | |
2948 | ||
f4f52cb5 CB |
2949 | int chown_mapped_root_exec_wrapper(void *args) |
2950 | { | |
2951 | execvp("lxc-usernsexec", args); | |
2952 | return -1; | |
2953 | } | |
2954 | ||
f6d3e3e4 | 2955 | /* |
7b50c609 TS |
2956 | * chown_mapped_root: for an unprivileged user with uid/gid X to |
2957 | * chown a dir to subuid/subgid Y, he needs to run chown as root | |
2958 | * in a userns where nsid 0 is mapped to hostuid/hostgid Y, and | |
2959 | * nsid Y is mapped to hostuid/hostgid X. That way, the container | |
2960 | * root is privileged with respect to hostuid/hostgid X, allowing | |
2961 | * him to do the chown. | |
f6d3e3e4 | 2962 | */ |
41dc7155 | 2963 | int chown_mapped_root(const char *path, struct lxc_conf *conf) |
f6d3e3e4 | 2964 | { |
f4f52cb5 | 2965 | uid_t rootuid, rootgid; |
2a9a80cb | 2966 | unsigned long val; |
f4f52cb5 CB |
2967 | int hostuid, hostgid, ret; |
2968 | struct stat sb; | |
2969 | char map1[100], map2[100], map3[100], map4[100], map5[100]; | |
2970 | char ugid[100]; | |
41dc7155 | 2971 | const char *args1[] = {"lxc-usernsexec", |
f4f52cb5 CB |
2972 | "-m", map1, |
2973 | "-m", map2, | |
2974 | "-m", map3, | |
2975 | "-m", map5, | |
2976 | "--", "chown", ugid, path, | |
2977 | NULL}; | |
41dc7155 | 2978 | const char *args2[] = {"lxc-usernsexec", |
f4f52cb5 CB |
2979 | "-m", map1, |
2980 | "-m", map2, | |
2981 | "-m", map3, | |
2982 | "-m", map4, | |
2983 | "-m", map5, | |
2984 | "--", "chown", ugid, path, | |
2985 | NULL}; | |
2986 | char cmd_output[MAXPATHLEN]; | |
2987 | ||
2988 | hostuid = geteuid(); | |
2989 | hostgid = getegid(); | |
f6d3e3e4 | 2990 | |
2a9a80cb | 2991 | if (!get_mapped_rootid(conf, ID_TYPE_UID, &val)) { |
bc80f098 | 2992 | ERROR("No uid mapping for container root"); |
c4d10a05 | 2993 | return -1; |
f6d3e3e4 | 2994 | } |
f4f52cb5 | 2995 | rootuid = (uid_t)val; |
7b50c609 | 2996 | if (!get_mapped_rootid(conf, ID_TYPE_GID, &val)) { |
bc80f098 | 2997 | ERROR("No gid mapping for container root"); |
7b50c609 TS |
2998 | return -1; |
2999 | } | |
f4f52cb5 | 3000 | rootgid = (gid_t)val; |
2a9a80cb | 3001 | |
f4f52cb5 | 3002 | if (hostuid == 0) { |
7b50c609 | 3003 | if (chown(path, rootuid, rootgid) < 0) { |
c4d10a05 SH |
3004 | ERROR("Error chowning %s", path); |
3005 | return -1; | |
3006 | } | |
3007 | return 0; | |
3008 | } | |
f3d7e4ca | 3009 | |
f4f52cb5 | 3010 | if (rootuid == hostuid) { |
1a0e70ac | 3011 | /* nothing to do */ |
b103ceac | 3012 | INFO("Container root is our uid; no need to chown"); |
f3d7e4ca SH |
3013 | return 0; |
3014 | } | |
3015 | ||
bbdbf8f0 | 3016 | /* save the current gid of "path" */ |
f4f52cb5 CB |
3017 | if (stat(path, &sb) < 0) { |
3018 | ERROR("Error stat %s", path); | |
f6d3e3e4 SH |
3019 | return -1; |
3020 | } | |
7b50c609 | 3021 | |
bbdbf8f0 CB |
3022 | /* Update the path argument in case this was overlayfs. */ |
3023 | args1[sizeof(args1) / sizeof(args1[0]) - 2] = path; | |
3024 | args2[sizeof(args2) / sizeof(args2[0]) - 2] = path; | |
3025 | ||
f4f52cb5 CB |
3026 | /* |
3027 | * A file has to be group-owned by a gid mapped into the | |
3028 | * container, or the container won't be privileged over it. | |
3029 | */ | |
3030 | DEBUG("trying to chown \"%s\" to %d", path, hostgid); | |
3031 | if (sb.st_uid == hostuid && | |
3032 | mapped_hostid(sb.st_gid, conf, ID_TYPE_GID) < 0 && | |
3033 | chown(path, -1, hostgid) < 0) { | |
3034 | ERROR("Failed chgrping %s", path); | |
3035 | return -1; | |
3036 | } | |
f6d3e3e4 | 3037 | |
1a0e70ac | 3038 | /* "u:0:rootuid:1" */ |
f4f52cb5 CB |
3039 | ret = snprintf(map1, 100, "u:0:%d:1", rootuid); |
3040 | if (ret < 0 || ret >= 100) { | |
3041 | ERROR("Error uid printing map string"); | |
3042 | return -1; | |
3043 | } | |
7b50c609 | 3044 | |
1a0e70ac | 3045 | /* "u:hostuid:hostuid:1" */ |
f4f52cb5 CB |
3046 | ret = snprintf(map2, 100, "u:%d:%d:1", hostuid, hostuid); |
3047 | if (ret < 0 || ret >= 100) { | |
3048 | ERROR("Error uid printing map string"); | |
3049 | return -1; | |
3050 | } | |
c4d10a05 | 3051 | |
1a0e70ac | 3052 | /* "g:0:rootgid:1" */ |
f4f52cb5 CB |
3053 | ret = snprintf(map3, 100, "g:0:%d:1", rootgid); |
3054 | if (ret < 0 || ret >= 100) { | |
3055 | ERROR("Error gid printing map string"); | |
3056 | return -1; | |
3057 | } | |
98e5ba51 | 3058 | |
1a0e70ac | 3059 | /* "g:pathgid:rootgid+pathgid:1" */ |
f4f52cb5 CB |
3060 | ret = snprintf(map4, 100, "g:%d:%d:1", (gid_t)sb.st_gid, |
3061 | rootgid + (gid_t)sb.st_gid); | |
3062 | if (ret < 0 || ret >= 100) { | |
3063 | ERROR("Error gid printing map string"); | |
3064 | return -1; | |
3065 | } | |
c4d10a05 | 3066 | |
1a0e70ac | 3067 | /* "g:hostgid:hostgid:1" */ |
f4f52cb5 CB |
3068 | ret = snprintf(map5, 100, "g:%d:%d:1", hostgid, hostgid); |
3069 | if (ret < 0 || ret >= 100) { | |
3070 | ERROR("Error gid printing map string"); | |
3071 | return -1; | |
3072 | } | |
7b50c609 | 3073 | |
1a0e70ac | 3074 | /* "0:pathgid" (chown) */ |
f4f52cb5 CB |
3075 | ret = snprintf(ugid, 100, "0:%d", (gid_t)sb.st_gid); |
3076 | if (ret < 0 || ret >= 100) { | |
3077 | ERROR("Error owner printing format string for chown"); | |
3078 | return -1; | |
3079 | } | |
7b50c609 | 3080 | |
f4f52cb5 CB |
3081 | if (hostgid == sb.st_gid) |
3082 | ret = run_command(cmd_output, sizeof(cmd_output), | |
3083 | chown_mapped_root_exec_wrapper, | |
3084 | (void *)args1); | |
3085 | else | |
3086 | ret = run_command(cmd_output, sizeof(cmd_output), | |
3087 | chown_mapped_root_exec_wrapper, | |
3088 | (void *)args2); | |
3089 | if (ret < 0) | |
3090 | ERROR("lxc-usernsexec failed: %s", cmd_output); | |
7b50c609 | 3091 | |
f4f52cb5 | 3092 | return ret; |
f6d3e3e4 SH |
3093 | } |
3094 | ||
943144d9 CB |
3095 | /* NOTE: Must not be called from inside the container namespace! */ |
3096 | int lxc_create_tmp_proc_mount(struct lxc_conf *conf) | |
5112cd70 SH |
3097 | { |
3098 | int mounted; | |
3099 | ||
943144d9 | 3100 | mounted = lxc_mount_proc_if_needed(conf->rootfs.path ? conf->rootfs.mount : ""); |
5112cd70 | 3101 | if (mounted == -1) { |
943144d9 | 3102 | SYSERROR("failed to mount /proc in the container"); |
01958b1f | 3103 | /* continue only if there is no rootfs */ |
943144d9 | 3104 | if (conf->rootfs.path) |
01958b1f | 3105 | return -1; |
5112cd70 | 3106 | } else if (mounted == 1) { |
943144d9 | 3107 | conf->tmp_umount_proc = 1; |
5112cd70 | 3108 | } |
943144d9 | 3109 | |
5112cd70 SH |
3110 | return 0; |
3111 | } | |
3112 | ||
3113 | void tmp_proc_unmount(struct lxc_conf *lxc_conf) | |
3114 | { | |
3115 | if (lxc_conf->tmp_umount_proc == 1) { | |
3116 | umount("/proc"); | |
3117 | lxc_conf->tmp_umount_proc = 0; | |
3118 | } | |
3119 | } | |
3120 | ||
6a0c909a | 3121 | void remount_all_slave(void) |
e995d7a2 SH |
3122 | { |
3123 | /* walk /proc/mounts and change any shared entries to slave */ | |
3124 | FILE *f = fopen("/proc/self/mountinfo", "r"); | |
3125 | char *line = NULL; | |
3126 | size_t len = 0; | |
3127 | ||
3128 | if (!f) { | |
3129 | SYSERROR("Failed to open /proc/self/mountinfo to mark all shared"); | |
3130 | ERROR("Continuing container startup..."); | |
3131 | return; | |
3132 | } | |
3133 | ||
3134 | while (getline(&line, &len, f) != -1) { | |
3135 | char *target, *opts; | |
3136 | target = get_field(line, 4); | |
3137 | if (!target) | |
3138 | continue; | |
3139 | opts = get_field(target, 2); | |
3140 | if (!opts) | |
3141 | continue; | |
3142 | null_endofword(opts); | |
3143 | if (!strstr(opts, "shared")) | |
3144 | continue; | |
3145 | null_endofword(target); | |
3146 | if (mount(NULL, target, NULL, MS_SLAVE, NULL)) { | |
3147 | SYSERROR("Failed to make %s rslave", target); | |
3148 | ERROR("Continuing..."); | |
3149 | } | |
3150 | } | |
3151 | fclose(f); | |
f10fad2f | 3152 | free(line); |
e995d7a2 SH |
3153 | } |
3154 | ||
2322903b SH |
3155 | void lxc_execute_bind_init(struct lxc_conf *conf) |
3156 | { | |
3157 | int ret; | |
9d9c111c SH |
3158 | char path[PATH_MAX], destpath[PATH_MAX], *p; |
3159 | ||
3160 | /* If init exists in the container, don't bind mount a static one */ | |
3161 | p = choose_init(conf->rootfs.mount); | |
3162 | if (p) { | |
3163 | free(p); | |
3164 | return; | |
3165 | } | |
2322903b SH |
3166 | |
3167 | ret = snprintf(path, PATH_MAX, SBINDIR "/init.lxc.static"); | |
3168 | if (ret < 0 || ret >= PATH_MAX) { | |
3169 | WARN("Path name too long searching for lxc.init.static"); | |
3170 | return; | |
3171 | } | |
3172 | ||
3173 | if (!file_exists(path)) { | |
3174 | INFO("%s does not exist on host", path); | |
3175 | return; | |
3176 | } | |
3177 | ||
3178 | ret = snprintf(destpath, PATH_MAX, "%s%s", conf->rootfs.mount, "/init.lxc.static"); | |
3179 | if (ret < 0 || ret >= PATH_MAX) { | |
3180 | WARN("Path name too long for container's lxc.init.static"); | |
3181 | return; | |
3182 | } | |
3183 | ||
3184 | if (!file_exists(destpath)) { | |
3185 | FILE * pathfile = fopen(destpath, "wb"); | |
3186 | if (!pathfile) { | |
3187 | SYSERROR("Failed to create mount target '%s'", destpath); | |
3188 | return; | |
3189 | } | |
3190 | fclose(pathfile); | |
3191 | } | |
3192 | ||
592fd47a | 3193 | ret = safe_mount(path, destpath, "none", MS_BIND, NULL, conf->rootfs.mount); |
2322903b SH |
3194 | if (ret < 0) |
3195 | SYSERROR("Failed to bind lxc.init.static into container"); | |
3196 | INFO("lxc.init.static bound into container at %s", path); | |
3197 | } | |
3198 | ||
35120d9c SH |
3199 | /* |
3200 | * This does the work of remounting / if it is shared, calling the | |
3201 | * container pre-mount hooks, and mounting the rootfs. | |
3202 | */ | |
3203 | int do_rootfs_setup(struct lxc_conf *conf, const char *name, const char *lxcpath) | |
0ad19a3f | 3204 | { |
35120d9c SH |
3205 | if (conf->rootfs_setup) { |
3206 | /* | |
3207 | * rootfs was set up in another namespace. bind-mount it | |
3208 | * to give us a mount in our own ns so we can pivot_root to it | |
3209 | */ | |
3210 | const char *path = conf->rootfs.mount; | |
3211 | if (mount(path, path, "rootfs", MS_BIND, NULL) < 0) { | |
3212 | ERROR("Failed to bind-mount container / onto itself"); | |
145832ba | 3213 | return -1; |
35120d9c | 3214 | } |
145832ba | 3215 | return 0; |
35120d9c | 3216 | } |
d4ef7c50 | 3217 | |
e995d7a2 SH |
3218 | remount_all_slave(); |
3219 | ||
14a7b0f9 | 3220 | if (run_lxc_hooks(name, "pre-mount", conf, NULL)) { |
35120d9c SH |
3221 | ERROR("failed to run pre-mount hooks for container '%s'.", name); |
3222 | return -1; | |
3223 | } | |
3224 | ||
9aa76a17 | 3225 | if (lxc_setup_rootfs(conf)) { |
35120d9c SH |
3226 | ERROR("failed to setup rootfs for '%s'", name); |
3227 | return -1; | |
3228 | } | |
3229 | ||
3230 | conf->rootfs_setup = true; | |
3231 | return 0; | |
3232 | } | |
3233 | ||
1c1c7051 SH |
3234 | static bool verify_start_hooks(struct lxc_conf *conf) |
3235 | { | |
3236 | struct lxc_list *it; | |
3237 | char path[MAXPATHLEN]; | |
3238 | lxc_list_for_each(it, &conf->hooks[LXCHOOK_START]) { | |
3239 | char *hookname = it->elem; | |
3240 | struct stat st; | |
3241 | int ret; | |
3242 | ||
3243 | ret = snprintf(path, MAXPATHLEN, "%s%s", | |
7b6753e7 | 3244 | conf->rootfs.path ? conf->rootfs.mount : "", hookname); |
1c1c7051 SH |
3245 | if (ret < 0 || ret >= MAXPATHLEN) |
3246 | return false; | |
3247 | ret = stat(path, &st); | |
3248 | if (ret) { | |
7b6753e7 | 3249 | SYSERROR("Start hook %s not found in container", |
1c1c7051 SH |
3250 | hookname); |
3251 | return false; | |
3252 | } | |
6a0c909a | 3253 | return true; |
1c1c7051 SH |
3254 | } |
3255 | ||
3256 | return true; | |
3257 | } | |
3258 | ||
3b988b33 | 3259 | int lxc_setup(struct lxc_handler *handler) |
35120d9c | 3260 | { |
2187efd3 | 3261 | int ret; |
35120d9c SH |
3262 | const char *name = handler->name; |
3263 | struct lxc_conf *lxc_conf = handler->conf; | |
3264 | const char *lxcpath = handler->lxcpath; | |
35120d9c SH |
3265 | |
3266 | if (do_rootfs_setup(lxc_conf, name, lxcpath) < 0) { | |
3267 | ERROR("Error setting up rootfs mount after spawn"); | |
3268 | return -1; | |
3269 | } | |
3270 | ||
28d9e29e | 3271 | if (handler->nsfd[LXC_NS_UTS] == -1) { |
6c544cb3 MM |
3272 | if (setup_utsname(lxc_conf->utsname)) { |
3273 | ERROR("failed to setup the utsname for '%s'", name); | |
3274 | return -1; | |
3275 | } | |
0ad19a3f | 3276 | } |
3277 | ||
811ef482 | 3278 | if (lxc_setup_network_in_child_namespaces(lxc_conf, &lxc_conf->network)) { |
36eb9bde | 3279 | ERROR("failed to setup the network for '%s'", name); |
95b5ffaf | 3280 | return -1; |
0ad19a3f | 3281 | } |
3282 | ||
790255cf CB |
3283 | if (lxc_network_send_name_and_ifindex_to_parent(handler) < 0) { |
3284 | ERROR("Failed to network device names and ifindices to parent"); | |
3285 | return -1; | |
3286 | } | |
3287 | ||
bc6928ff | 3288 | if (lxc_conf->autodev > 0) { |
14221cbb | 3289 | if (mount_autodev(name, &lxc_conf->rootfs, lxcpath)) { |
91c3830e | 3290 | ERROR("failed to mount /dev in the container"); |
c6883f38 SH |
3291 | return -1; |
3292 | } | |
3293 | } | |
3294 | ||
368bbc02 CS |
3295 | /* do automatic mounts (mainly /proc and /sys), but exclude |
3296 | * those that need to wait until other stuff has finished | |
3297 | */ | |
4fb3cba5 | 3298 | if (lxc_mount_auto_mounts(lxc_conf, lxc_conf->auto_mounts & ~LXC_AUTO_CGROUP_MASK, handler) < 0) { |
368bbc02 CS |
3299 | ERROR("failed to setup the automatic mounts for '%s'", name); |
3300 | return -1; | |
3301 | } | |
3302 | ||
06749971 | 3303 | if (setup_mount(lxc_conf, &lxc_conf->rootfs, lxc_conf->fstab, name, lxcpath)) { |
36eb9bde | 3304 | ERROR("failed to setup the mounts for '%s'", name); |
95b5ffaf | 3305 | return -1; |
576f946d | 3306 | } |
3307 | ||
7b6753e7 | 3308 | /* Make sure any start hooks are in the container */ |
1c1c7051 SH |
3309 | if (!verify_start_hooks(lxc_conf)) |
3310 | return -1; | |
3311 | ||
2322903b SH |
3312 | if (lxc_conf->is_execute) |
3313 | lxc_execute_bind_init(lxc_conf); | |
3314 | ||
368bbc02 CS |
3315 | /* now mount only cgroup, if wanted; |
3316 | * before, /sys could not have been mounted | |
3317 | * (is either mounted automatically or via fstab entries) | |
3318 | */ | |
4fb3cba5 | 3319 | if (lxc_mount_auto_mounts(lxc_conf, lxc_conf->auto_mounts & LXC_AUTO_CGROUP_MASK, handler) < 0) { |
368bbc02 CS |
3320 | ERROR("failed to setup the automatic mounts for '%s'", name); |
3321 | return -1; | |
3322 | } | |
3323 | ||
14a7b0f9 | 3324 | if (run_lxc_hooks(name, "mount", lxc_conf, NULL)) { |
773fb9ca SH |
3325 | ERROR("failed to run mount hooks for container '%s'.", name); |
3326 | return -1; | |
3327 | } | |
3328 | ||
bc6928ff | 3329 | if (lxc_conf->autodev > 0) { |
14a7b0f9 | 3330 | if (run_lxc_hooks(name, "autodev", lxc_conf, NULL)) { |
f7bee6c6 MW |
3331 | ERROR("failed to run autodev hooks for container '%s'.", name); |
3332 | return -1; | |
3333 | } | |
06749971 | 3334 | |
27245ff7 | 3335 | if (lxc_fill_autodev(&lxc_conf->rootfs)) { |
91c3830e SH |
3336 | ERROR("failed to populate /dev in the container"); |
3337 | return -1; | |
3338 | } | |
3339 | } | |
368bbc02 | 3340 | |
181437fd YT |
3341 | if (!lxc_list_empty(&lxc_conf->mount_list) && setup_mount_entries(lxc_conf, &lxc_conf->rootfs, &lxc_conf->mount_list, name, lxcpath)) { |
3342 | ERROR("failed to setup the mount entries for '%s'", name); | |
3343 | return -1; | |
3344 | } | |
3345 | ||
ed8704d0 CB |
3346 | ret = lxc_setup_console(&lxc_conf->rootfs, &lxc_conf->console, |
3347 | lxc_conf->ttydir); | |
3348 | if (ret < 0) { | |
3349 | ERROR("Failed to setup console"); | |
95b5ffaf | 3350 | return -1; |
6e590161 | 3351 | } |
3352 | ||
ed8704d0 CB |
3353 | ret = lxc_setup_dev_symlinks(&lxc_conf->rootfs); |
3354 | if (ret < 0) { | |
3355 | ERROR("Failed to setup /dev symlinks"); | |
69aa6655 DE |
3356 | return -1; |
3357 | } | |
3358 | ||
5112cd70 | 3359 | /* mount /proc if it's not already there */ |
943144d9 | 3360 | if (lxc_create_tmp_proc_mount(lxc_conf) < 0) { |
fe4de9a6 | 3361 | ERROR("failed to LSM mount proc for '%s'", name); |
e075f5d9 | 3362 | return -1; |
e075f5d9 | 3363 | } |
e075f5d9 | 3364 | |
ac778708 | 3365 | if (setup_pivot_root(&lxc_conf->rootfs)) { |
36eb9bde | 3366 | ERROR("failed to set rootfs for '%s'", name); |
95b5ffaf | 3367 | return -1; |
ed502555 | 3368 | } |
3369 | ||
f4900711 | 3370 | if (lxc_setup_devpts(lxc_conf)) { |
36eb9bde | 3371 | ERROR("failed to setup the new pts instance"); |
95b5ffaf | 3372 | return -1; |
3c26f34e | 3373 | } |
3374 | ||
2187efd3 CB |
3375 | ret = lxc_create_ttys(handler); |
3376 | if (ret < 0) | |
e8bd4e43 | 3377 | return -1; |
e8bd4e43 | 3378 | |
cccc74b5 DL |
3379 | if (setup_personality(lxc_conf->personality)) { |
3380 | ERROR("failed to setup personality"); | |
3381 | return -1; | |
3382 | } | |
3383 | ||
7edd0540 L |
3384 | /* set sysctl value to a path under /proc/sys as determined from the key. |
3385 | * For e.g. net.ipv4.ip_forward translated to /proc/sys/net/ipv4/ip_forward. | |
3386 | */ | |
3387 | if (!lxc_list_empty(&lxc_conf->sysctls)) { | |
3388 | ret = setup_sysctl_parameters(&lxc_conf->sysctls); | |
3389 | if (ret < 0) | |
3390 | return -1; | |
3391 | } | |
3392 | ||
97a8f74f SG |
3393 | if (!lxc_list_empty(&lxc_conf->keepcaps)) { |
3394 | if (!lxc_list_empty(&lxc_conf->caps)) { | |
7389ca26 | 3395 | ERROR("Container requests lxc.cap.drop and lxc.cap.keep: either use lxc.cap.drop or lxc.cap.keep, not both."); |
f6d3e3e4 SH |
3396 | return -1; |
3397 | } | |
97a8f74f SG |
3398 | if (dropcaps_except(&lxc_conf->keepcaps)) { |
3399 | ERROR("failed to keep requested caps"); | |
3400 | return -1; | |
3401 | } | |
3402 | } else if (setup_caps(&lxc_conf->caps)) { | |
3403 | ERROR("failed to drop capabilities"); | |
3404 | return -1; | |
81810dd1 DL |
3405 | } |
3406 | ||
f4152036 | 3407 | NOTICE("Container \"%s\" is set up", name); |
cd54d859 | 3408 | |
0ad19a3f | 3409 | return 0; |
3410 | } | |
26ddeedd | 3411 | |
3f60c2f7 | 3412 | int run_lxc_hooks(const char *name, char *hookname, struct lxc_conf *conf, |
14a7b0f9 | 3413 | char *argv[]) |
26ddeedd | 3414 | { |
26ddeedd | 3415 | struct lxc_list *it; |
3f60c2f7 | 3416 | int which = -1; |
26ddeedd | 3417 | |
3f60c2f7 | 3418 | if (strcmp(hookname, "pre-start") == 0) |
26ddeedd | 3419 | which = LXCHOOK_PRESTART; |
3f60c2f7 | 3420 | else if (strcmp(hookname, "start-host") == 0) |
08dd2805 | 3421 | which = LXCHOOK_START_HOST; |
3f60c2f7 | 3422 | else if (strcmp(hookname, "pre-mount") == 0) |
5ea6163a | 3423 | which = LXCHOOK_PREMOUNT; |
3f60c2f7 | 3424 | else if (strcmp(hookname, "mount") == 0) |
26ddeedd | 3425 | which = LXCHOOK_MOUNT; |
3f60c2f7 | 3426 | else if (strcmp(hookname, "autodev") == 0) |
f7bee6c6 | 3427 | which = LXCHOOK_AUTODEV; |
3f60c2f7 | 3428 | else if (strcmp(hookname, "start") == 0) |
26ddeedd | 3429 | which = LXCHOOK_START; |
3f60c2f7 | 3430 | else if (strcmp(hookname, "stop") == 0) |
52492063 | 3431 | which = LXCHOOK_STOP; |
3f60c2f7 | 3432 | else if (strcmp(hookname, "post-stop") == 0) |
26ddeedd | 3433 | which = LXCHOOK_POSTSTOP; |
3f60c2f7 | 3434 | else if (strcmp(hookname, "clone") == 0) |
148e91f5 | 3435 | which = LXCHOOK_CLONE; |
3f60c2f7 | 3436 | else if (strcmp(hookname, "destroy") == 0) |
37cf711b | 3437 | which = LXCHOOK_DESTROY; |
26ddeedd SH |
3438 | else |
3439 | return -1; | |
3f60c2f7 | 3440 | |
26ddeedd SH |
3441 | lxc_list_for_each(it, &conf->hooks[which]) { |
3442 | int ret; | |
3f60c2f7 CB |
3443 | char *hook = it->elem; |
3444 | ||
3445 | ret = run_script_argv(name, conf->hooks_version, "lxc", hook, | |
14a7b0f9 | 3446 | hookname, argv); |
3f60c2f7 CB |
3447 | if (ret < 0) |
3448 | return -1; | |
26ddeedd | 3449 | } |
3f60c2f7 | 3450 | |
26ddeedd SH |
3451 | return 0; |
3452 | } | |
72d0e1cb | 3453 | |
72d0e1cb SG |
3454 | int lxc_clear_config_caps(struct lxc_conf *c) |
3455 | { | |
1a0e70ac | 3456 | struct lxc_list *it, *next; |
72d0e1cb | 3457 | |
9ebb03ad | 3458 | lxc_list_for_each_safe(it, &c->caps, next) { |
72d0e1cb SG |
3459 | lxc_list_del(it); |
3460 | free(it->elem); | |
3461 | free(it); | |
3462 | } | |
3463 | return 0; | |
3464 | } | |
3465 | ||
c7e345ae CB |
3466 | static int lxc_free_idmap(struct lxc_list *id_map) |
3467 | { | |
27c27d73 SH |
3468 | struct lxc_list *it, *next; |
3469 | ||
4355ab5f | 3470 | lxc_list_for_each_safe(it, id_map, next) { |
27c27d73 SH |
3471 | lxc_list_del(it); |
3472 | free(it->elem); | |
3473 | free(it); | |
3474 | } | |
c7e345ae | 3475 | |
27c27d73 SH |
3476 | return 0; |
3477 | } | |
3478 | ||
4355ab5f SH |
3479 | int lxc_clear_idmaps(struct lxc_conf *c) |
3480 | { | |
3481 | return lxc_free_idmap(&c->id_map); | |
3482 | } | |
3483 | ||
1fb86a7c SH |
3484 | int lxc_clear_config_keepcaps(struct lxc_conf *c) |
3485 | { | |
3486 | struct lxc_list *it,*next; | |
3487 | ||
3488 | lxc_list_for_each_safe(it, &c->keepcaps, next) { | |
3489 | lxc_list_del(it); | |
3490 | free(it->elem); | |
3491 | free(it); | |
3492 | } | |
3493 | return 0; | |
3494 | } | |
3495 | ||
12a50cc6 | 3496 | int lxc_clear_cgroups(struct lxc_conf *c, const char *key) |
72d0e1cb | 3497 | { |
9ebb03ad | 3498 | struct lxc_list *it,*next; |
72d0e1cb | 3499 | bool all = false; |
a6390f01 | 3500 | const char *k = NULL; |
72d0e1cb SG |
3501 | |
3502 | if (strcmp(key, "lxc.cgroup") == 0) | |
3503 | all = true; | |
e409b214 CB |
3504 | else if (strncmp(key, "lxc.cgroup.", sizeof("lxc.cgroup.") - 1) == 0) |
3505 | k = key + sizeof("lxc.cgroup.") - 1; | |
a6390f01 WB |
3506 | else |
3507 | return -1; | |
72d0e1cb | 3508 | |
9ebb03ad | 3509 | lxc_list_for_each_safe(it, &c->cgroup, next) { |
72d0e1cb SG |
3510 | struct lxc_cgroup *cg = it->elem; |
3511 | if (!all && strcmp(cg->subsystem, k) != 0) | |
3512 | continue; | |
3513 | lxc_list_del(it); | |
3514 | free(cg->subsystem); | |
3515 | free(cg->value); | |
3516 | free(cg); | |
3517 | free(it); | |
3518 | } | |
e409b214 | 3519 | |
72d0e1cb SG |
3520 | return 0; |
3521 | } | |
3522 | ||
c6d09e15 WB |
3523 | int lxc_clear_limits(struct lxc_conf *c, const char *key) |
3524 | { | |
3525 | struct lxc_list *it, *next; | |
3526 | bool all = false; | |
3527 | const char *k = NULL; | |
3528 | ||
b668653c | 3529 | if (strcmp(key, "lxc.limit") == 0 || strcmp(key, "lxc.prlimit") == 0) |
c6d09e15 | 3530 | all = true; |
b668653c CB |
3531 | else if (strncmp(key, "lxc.limit.", sizeof("lxc.limit.") - 1) == 0) |
3532 | k = key + sizeof("lxc.limit.") - 1; | |
3533 | else if (strncmp(key, "lxc.prlimit.", sizeof("lxc.prlimit.") - 1) == 0) | |
3534 | k = key + sizeof("lxc.prlimit.") - 1; | |
c6d09e15 WB |
3535 | else |
3536 | return -1; | |
3537 | ||
3538 | lxc_list_for_each_safe(it, &c->limits, next) { | |
3539 | struct lxc_limit *lim = it->elem; | |
3540 | if (!all && strcmp(lim->resource, k) != 0) | |
3541 | continue; | |
3542 | lxc_list_del(it); | |
3543 | free(lim->resource); | |
3544 | free(lim); | |
3545 | free(it); | |
3546 | } | |
b668653c | 3547 | |
c6d09e15 WB |
3548 | return 0; |
3549 | } | |
3550 | ||
7edd0540 L |
3551 | int lxc_clear_sysctls(struct lxc_conf *c, const char *key) |
3552 | { | |
3553 | struct lxc_list *it, *next; | |
3554 | bool all = false; | |
3555 | const char *k = NULL; | |
3556 | ||
3557 | if (strcmp(key, "lxc.sysctl") == 0) | |
3558 | all = true; | |
3559 | else if (strncmp(key, "lxc.sysctl.", sizeof("lxc.sysctl.") - 1) == 0) | |
3560 | k = key + sizeof("lxc.sysctl.") - 1; | |
3561 | else | |
3562 | return -1; | |
3563 | ||
3564 | lxc_list_for_each_safe(it, &c->sysctls, next) { | |
3565 | struct lxc_sysctl *elem = it->elem; | |
3566 | if (!all && strcmp(elem->key, k) != 0) | |
3567 | continue; | |
3568 | lxc_list_del(it); | |
3569 | free(elem->key); | |
3570 | free(elem->value); | |
3571 | free(elem); | |
3572 | free(it); | |
3573 | } | |
3574 | return 0; | |
3575 | } | |
3576 | ||
61d7a733 YT |
3577 | int lxc_clear_procs(struct lxc_conf *c, const char *key) |
3578 | { | |
3579 | struct lxc_list *it,*next; | |
3580 | bool all = false; | |
3581 | const char *k = NULL; | |
3582 | ||
3583 | if (strcmp(key, "lxc.proc") == 0) | |
3584 | all = true; | |
3585 | else if (strncmp(key, "lxc.proc.", sizeof("lxc.proc.") - 1) == 0) | |
3586 | k = key + sizeof("lxc.proc.") - 1; | |
3587 | else | |
3588 | return -1; | |
3589 | ||
3590 | lxc_list_for_each_safe(it, &c->procs, next) { | |
3591 | struct lxc_proc *proc = it->elem; | |
3592 | if (!all && strcmp(proc->filename, k) != 0) | |
3593 | continue; | |
3594 | lxc_list_del(it); | |
3595 | free(proc->filename); | |
3596 | free(proc->value); | |
3597 | free(proc); | |
3598 | free(it); | |
3599 | } | |
3600 | ||
3601 | return 0; | |
3602 | } | |
3603 | ||
ee1e7aa0 SG |
3604 | int lxc_clear_groups(struct lxc_conf *c) |
3605 | { | |
3606 | struct lxc_list *it,*next; | |
3607 | ||
3608 | lxc_list_for_each_safe(it, &c->groups, next) { | |
3609 | lxc_list_del(it); | |
3610 | free(it->elem); | |
3611 | free(it); | |
3612 | } | |
3613 | return 0; | |
3614 | } | |
3615 | ||
ab799c0b SG |
3616 | int lxc_clear_environment(struct lxc_conf *c) |
3617 | { | |
3618 | struct lxc_list *it,*next; | |
3619 | ||
3620 | lxc_list_for_each_safe(it, &c->environment, next) { | |
3621 | lxc_list_del(it); | |
3622 | free(it->elem); | |
3623 | free(it); | |
3624 | } | |
3625 | return 0; | |
3626 | } | |
3627 | ||
72d0e1cb SG |
3628 | int lxc_clear_mount_entries(struct lxc_conf *c) |
3629 | { | |
9ebb03ad | 3630 | struct lxc_list *it,*next; |
72d0e1cb | 3631 | |
9ebb03ad | 3632 | lxc_list_for_each_safe(it, &c->mount_list, next) { |
72d0e1cb SG |
3633 | lxc_list_del(it); |
3634 | free(it->elem); | |
3635 | free(it); | |
3636 | } | |
3637 | return 0; | |
3638 | } | |
3639 | ||
b099e9e9 SH |
3640 | int lxc_clear_automounts(struct lxc_conf *c) |
3641 | { | |
3642 | c->auto_mounts = 0; | |
3643 | return 0; | |
3644 | } | |
3645 | ||
12a50cc6 | 3646 | int lxc_clear_hooks(struct lxc_conf *c, const char *key) |
72d0e1cb | 3647 | { |
9ebb03ad | 3648 | struct lxc_list *it,*next; |
17ed13a3 | 3649 | bool all = false, done = false; |
a6390f01 | 3650 | const char *k = NULL; |
72d0e1cb SG |
3651 | int i; |
3652 | ||
17ed13a3 SH |
3653 | if (strcmp(key, "lxc.hook") == 0) |
3654 | all = true; | |
a6390f01 WB |
3655 | else if (strncmp(key, "lxc.hook.", sizeof("lxc.hook.")-1) == 0) |
3656 | k = key + sizeof("lxc.hook.")-1; | |
3657 | else | |
3658 | return -1; | |
17ed13a3 | 3659 | |
72d0e1cb | 3660 | for (i=0; i<NUM_LXC_HOOKS; i++) { |
17ed13a3 | 3661 | if (all || strcmp(k, lxchook_names[i]) == 0) { |
9ebb03ad | 3662 | lxc_list_for_each_safe(it, &c->hooks[i], next) { |
17ed13a3 SH |
3663 | lxc_list_del(it); |
3664 | free(it->elem); | |
3665 | free(it); | |
3666 | } | |
3667 | done = true; | |
72d0e1cb SG |
3668 | } |
3669 | } | |
17ed13a3 SH |
3670 | |
3671 | if (!done) { | |
3672 | ERROR("Invalid hook key: %s", key); | |
3673 | return -1; | |
3674 | } | |
72d0e1cb SG |
3675 | return 0; |
3676 | } | |
8eb5694b | 3677 | |
4184c3e1 SH |
3678 | static inline void lxc_clear_aliens(struct lxc_conf *conf) |
3679 | { | |
3680 | struct lxc_list *it,*next; | |
3681 | ||
3682 | lxc_list_for_each_safe(it, &conf->aliens, next) { | |
3683 | lxc_list_del(it); | |
3684 | free(it->elem); | |
3685 | free(it); | |
3686 | } | |
3687 | } | |
3688 | ||
c7b15d1e | 3689 | void lxc_clear_includes(struct lxc_conf *conf) |
f979ac15 SH |
3690 | { |
3691 | struct lxc_list *it,*next; | |
3692 | ||
3693 | lxc_list_for_each_safe(it, &conf->includes, next) { | |
3694 | lxc_list_del(it); | |
3695 | free(it->elem); | |
3696 | free(it); | |
3697 | } | |
3698 | } | |
3699 | ||
8eb5694b SH |
3700 | void lxc_conf_free(struct lxc_conf *conf) |
3701 | { | |
3702 | if (!conf) | |
3703 | return; | |
858377e4 SH |
3704 | if (current_config == conf) |
3705 | current_config = NULL; | |
e98affda | 3706 | lxc_pty_conf_free(&conf->console); |
f10fad2f | 3707 | free(conf->rootfs.mount); |
b3b8c97f | 3708 | free(conf->rootfs.bdev_type); |
f10fad2f ME |
3709 | free(conf->rootfs.options); |
3710 | free(conf->rootfs.path); | |
f10fad2f | 3711 | free(conf->logfile); |
858377e4 SH |
3712 | if (conf->logfd != -1) |
3713 | close(conf->logfd); | |
f10fad2f ME |
3714 | free(conf->utsname); |
3715 | free(conf->ttydir); | |
3716 | free(conf->fstab); | |
3717 | free(conf->rcfile); | |
5cda27c1 | 3718 | free(conf->execute_cmd); |
f10fad2f | 3719 | free(conf->init_cmd); |
3c491553 | 3720 | free(conf->init_cwd); |
6b0d5538 | 3721 | free(conf->unexpanded_config); |
393903d1 | 3722 | free(conf->pty_names); |
76d0127f | 3723 | free(conf->syslog); |
c302b476 | 3724 | lxc_free_networks(&conf->network); |
f10fad2f ME |
3725 | free(conf->lsm_aa_profile); |
3726 | free(conf->lsm_se_context); | |
769872f9 | 3727 | lxc_seccomp_free(conf); |
8eb5694b | 3728 | lxc_clear_config_caps(conf); |
1fb86a7c | 3729 | lxc_clear_config_keepcaps(conf); |
8eb5694b | 3730 | lxc_clear_cgroups(conf, "lxc.cgroup"); |
17ed13a3 | 3731 | lxc_clear_hooks(conf, "lxc.hook"); |
8eb5694b | 3732 | lxc_clear_mount_entries(conf); |
27c27d73 | 3733 | lxc_clear_idmaps(conf); |
ee1e7aa0 | 3734 | lxc_clear_groups(conf); |
f979ac15 | 3735 | lxc_clear_includes(conf); |
761d81ca | 3736 | lxc_clear_aliens(conf); |
ab799c0b | 3737 | lxc_clear_environment(conf); |
240d4b74 | 3738 | lxc_clear_limits(conf, "lxc.prlimit"); |
7edd0540 | 3739 | lxc_clear_sysctls(conf, "lxc.sysctl"); |
61d7a733 | 3740 | lxc_clear_procs(conf, "lxc.proc"); |
43654d34 CB |
3741 | free(conf->cgroup_meta.dir); |
3742 | free(conf->cgroup_meta.controllers); | |
8eb5694b SH |
3743 | free(conf); |
3744 | } | |
4355ab5f SH |
3745 | |
3746 | struct userns_fn_data { | |
3747 | int (*fn)(void *); | |
c9b7c33e | 3748 | const char *fn_name; |
4355ab5f SH |
3749 | void *arg; |
3750 | int p[2]; | |
3751 | }; | |
3752 | ||
3753 | static int run_userns_fn(void *data) | |
3754 | { | |
3755 | struct userns_fn_data *d = data; | |
3756 | char c; | |
4355ab5f | 3757 | |
f8aa4bf3 | 3758 | /* Close write end of the pipe. */ |
4355ab5f | 3759 | close(d->p[1]); |
f8aa4bf3 CB |
3760 | |
3761 | /* Wait for parent to finish establishing a new mapping in the user | |
3762 | * namespace we are executing in. | |
3763 | */ | |
4355ab5f SH |
3764 | if (read(d->p[0], &c, 1) != 1) |
3765 | return -1; | |
f8aa4bf3 CB |
3766 | |
3767 | /* Close read end of the pipe. */ | |
4355ab5f | 3768 | close(d->p[0]); |
f8aa4bf3 | 3769 | |
c9b7c33e CB |
3770 | if (d->fn_name) |
3771 | TRACE("calling function \"%s\"", d->fn_name); | |
f8aa4bf3 | 3772 | /* Call function to run. */ |
4355ab5f SH |
3773 | return d->fn(d->arg); |
3774 | } | |
3775 | ||
db7cfe23 CB |
3776 | static struct id_map *mapped_nsid_add(struct lxc_conf *conf, unsigned id, |
3777 | enum idtype idtype) | |
3778 | { | |
3779 | struct id_map *map, *retmap; | |
3780 | ||
3781 | map = find_mapped_nsid_entry(conf, id, idtype); | |
3782 | if (!map) | |
3783 | return NULL; | |
3784 | ||
3785 | retmap = malloc(sizeof(*retmap)); | |
3786 | if (!retmap) | |
3787 | return NULL; | |
3788 | ||
3789 | memcpy(retmap, map, sizeof(*retmap)); | |
3790 | return retmap; | |
3791 | } | |
3792 | ||
c4333195 CB |
3793 | static struct id_map *find_mapped_hostid_entry(struct lxc_conf *conf, |
3794 | unsigned id, enum idtype idtype) | |
f8aa4bf3 CB |
3795 | { |
3796 | struct lxc_list *it; | |
3797 | struct id_map *map; | |
3798 | struct id_map *retmap = NULL; | |
3799 | ||
3800 | lxc_list_for_each(it, &conf->id_map) { | |
3801 | map = it->elem; | |
3802 | if (map->idtype != idtype) | |
3803 | continue; | |
3804 | ||
3805 | if (id >= map->hostid && id < map->hostid + map->range) { | |
3806 | retmap = map; | |
3807 | break; | |
3808 | } | |
3809 | } | |
3810 | ||
f8aa4bf3 CB |
3811 | return retmap; |
3812 | } | |
3813 | ||
4355ab5f | 3814 | /* |
f8aa4bf3 CB |
3815 | * Allocate a new {g,u}id mapping for the given {g,u}id. Re-use an already |
3816 | * existing one or establish a new one. | |
4355ab5f | 3817 | */ |
c4333195 | 3818 | static struct id_map *mapped_hostid_add(struct lxc_conf *conf, uid_t id, enum idtype type) |
4355ab5f | 3819 | { |
28a2d9e7 | 3820 | int hostid_mapped; |
c4333195 CB |
3821 | struct id_map *entry = NULL, *tmp = NULL; |
3822 | ||
3823 | entry = malloc(sizeof(*entry)); | |
3824 | if (!entry) | |
3825 | return NULL; | |
f8aa4bf3 | 3826 | |
28a2d9e7 | 3827 | /* Reuse existing mapping. */ |
c4333195 CB |
3828 | tmp = find_mapped_hostid_entry(conf, id, type); |
3829 | if (tmp) | |
3830 | return memcpy(entry, tmp, sizeof(*entry)); | |
f8aa4bf3 | 3831 | |
28a2d9e7 CB |
3832 | /* Find new mapping. */ |
3833 | hostid_mapped = find_unmapped_nsid(conf, type); | |
3834 | if (hostid_mapped < 0) { | |
c4333195 CB |
3835 | DEBUG("Failed to find free mapping for id %d", id); |
3836 | free(entry); | |
28a2d9e7 | 3837 | return NULL; |
f8aa4bf3 | 3838 | } |
f8aa4bf3 | 3839 | |
28a2d9e7 CB |
3840 | entry->idtype = type; |
3841 | entry->nsid = hostid_mapped; | |
3842 | entry->hostid = (unsigned long)id; | |
3843 | entry->range = 1; | |
4355ab5f | 3844 | |
28a2d9e7 | 3845 | return entry; |
4355ab5f SH |
3846 | } |
3847 | ||
dcf0ffdf | 3848 | struct lxc_list *get_minimal_idmap(struct lxc_conf *conf) |
4355ab5f | 3849 | { |
f8aa4bf3 | 3850 | uid_t euid, egid; |
4160c3a0 CB |
3851 | uid_t nsuid = (conf->root_nsuid_map != NULL) ? 0 : conf->init_uid; |
3852 | gid_t nsgid = (conf->root_nsgid_map != NULL) ? 0 : conf->init_gid; | |
f8aa4bf3 | 3853 | struct lxc_list *idmap = NULL, *tmplist = NULL; |
28a2d9e7 CB |
3854 | struct id_map *container_root_uid = NULL, *container_root_gid = NULL, |
3855 | *host_uid_map = NULL, *host_gid_map = NULL; | |
4355ab5f | 3856 | |
db7cfe23 | 3857 | /* Find container root mappings. */ |
4160c3a0 | 3858 | container_root_uid = mapped_nsid_add(conf, nsuid, ID_TYPE_UID); |
db7cfe23 | 3859 | if (!container_root_uid) { |
dcf0ffdf | 3860 | DEBUG("Failed to find mapping for namespace uid %d", 0); |
db7cfe23 | 3861 | goto on_error; |
f8aa4bf3 | 3862 | } |
dcf0ffdf CB |
3863 | euid = geteuid(); |
3864 | if (euid >= container_root_uid->hostid && | |
3865 | euid < (container_root_uid->hostid + container_root_uid->range)) | |
db7cfe23 | 3866 | host_uid_map = container_root_uid; |
f8aa4bf3 | 3867 | |
4160c3a0 | 3868 | container_root_gid = mapped_nsid_add(conf, nsgid, ID_TYPE_GID); |
db7cfe23 | 3869 | if (!container_root_gid) { |
dcf0ffdf | 3870 | DEBUG("Failed to find mapping for namespace gid %d", 0); |
f8aa4bf3 CB |
3871 | goto on_error; |
3872 | } | |
dcf0ffdf CB |
3873 | egid = getegid(); |
3874 | if (egid >= container_root_gid->hostid && | |
3875 | egid < (container_root_gid->hostid + container_root_gid->range)) | |
db7cfe23 | 3876 | host_gid_map = container_root_gid; |
f8aa4bf3 CB |
3877 | |
3878 | /* Check whether the {g,u}id of the user has a mapping. */ | |
954b7d9b | 3879 | if (!host_uid_map) |
c4333195 | 3880 | host_uid_map = mapped_hostid_add(conf, euid, ID_TYPE_UID); |
28a2d9e7 | 3881 | if (!host_uid_map) { |
db7cfe23 | 3882 | DEBUG("Failed to find mapping for uid %d", euid); |
f8aa4bf3 CB |
3883 | goto on_error; |
3884 | } | |
3885 | ||
dcf0ffdf CB |
3886 | if (!host_gid_map) |
3887 | host_gid_map = mapped_hostid_add(conf, egid, ID_TYPE_GID); | |
28a2d9e7 | 3888 | if (!host_gid_map) { |
db7cfe23 | 3889 | DEBUG("Failed to find mapping for gid %d", egid); |
28a2d9e7 CB |
3890 | goto on_error; |
3891 | } | |
3892 | ||
3893 | /* Allocate new {g,u}id map list. */ | |
3894 | idmap = malloc(sizeof(*idmap)); | |
3895 | if (!idmap) | |
3896 | goto on_error; | |
3897 | lxc_list_init(idmap); | |
3898 | ||
f8aa4bf3 CB |
3899 | /* Add container root to the map. */ |
3900 | tmplist = malloc(sizeof(*tmplist)); | |
3901 | if (!tmplist) | |
3902 | goto on_error; | |
3903 | lxc_list_add_elem(tmplist, container_root_uid); | |
3904 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 3905 | |
1d90e064 | 3906 | if (host_uid_map && (host_uid_map != container_root_uid)) { |
28a2d9e7 CB |
3907 | /* idmap will now keep track of that memory. */ |
3908 | container_root_uid = NULL; | |
3909 | ||
3910 | /* Add container root to the map. */ | |
3911 | tmplist = malloc(sizeof(*tmplist)); | |
3912 | if (!tmplist) | |
3913 | goto on_error; | |
3914 | lxc_list_add_elem(tmplist, host_uid_map); | |
3915 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 3916 | } |
1d90e064 CB |
3917 | /* idmap will now keep track of that memory. */ |
3918 | container_root_uid = NULL; | |
3919 | /* idmap will now keep track of that memory. */ | |
3920 | host_uid_map = NULL; | |
f8aa4bf3 CB |
3921 | |
3922 | tmplist = malloc(sizeof(*tmplist)); | |
3923 | if (!tmplist) | |
3924 | goto on_error; | |
3925 | lxc_list_add_elem(tmplist, container_root_gid); | |
3926 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 3927 | |
1d90e064 | 3928 | if (host_gid_map && (host_gid_map != container_root_gid)) { |
28a2d9e7 CB |
3929 | /* idmap will now keep track of that memory. */ |
3930 | container_root_gid = NULL; | |
3931 | ||
3932 | tmplist = malloc(sizeof(*tmplist)); | |
3933 | if (!tmplist) | |
3934 | goto on_error; | |
3935 | lxc_list_add_elem(tmplist, host_gid_map); | |
3936 | lxc_list_add_tail(idmap, tmplist); | |
28a2d9e7 | 3937 | } |
1d90e064 CB |
3938 | /* idmap will now keep track of that memory. */ |
3939 | container_root_gid = NULL; | |
3940 | /* idmap will now keep track of that memory. */ | |
3941 | host_gid_map = NULL; | |
f8aa4bf3 | 3942 | |
dcf0ffdf CB |
3943 | TRACE("Allocated minimal idmapping"); |
3944 | return idmap; | |
3945 | ||
3946 | on_error: | |
3947 | if (idmap) | |
3948 | lxc_free_idmap(idmap); | |
3949 | if (container_root_uid) | |
3950 | free(container_root_uid); | |
3951 | if (container_root_gid) | |
3952 | free(container_root_gid); | |
3953 | if (host_uid_map && (host_uid_map != container_root_uid)) | |
3954 | free(host_uid_map); | |
3955 | if (host_gid_map && (host_gid_map != container_root_gid)) | |
3956 | free(host_gid_map); | |
3957 | ||
3958 | return NULL; | |
3959 | } | |
3960 | ||
3961 | /* Run a function in a new user namespace. | |
3962 | * The caller's euid/egid will be mapped if it is not already. | |
3963 | * Afaict, userns_exec_1() is only used to operate based on privileges for the | |
3964 | * user's own {g,u}id on the host and for the container root's unmapped {g,u}id. | |
3965 | * This means we require only to establish a mapping from: | |
3966 | * - the container root {g,u}id as seen from the host > user's host {g,u}id | |
3967 | * - the container root -> some sub{g,u}id | |
3968 | * The former we add, if the user did not specifiy a mapping. The latter we | |
3969 | * retrieve from the ontainer's configured {g,u}id mappings as it must have been | |
3970 | * there to start the container in the first place. | |
3971 | */ | |
3972 | int userns_exec_1(struct lxc_conf *conf, int (*fn)(void *), void *data, | |
3973 | const char *fn_name) | |
3974 | { | |
3975 | pid_t pid; | |
3976 | struct userns_fn_data d; | |
3977 | int p[2]; | |
3978 | char c = '1'; | |
3979 | int ret = -1, status = -1; | |
3980 | struct lxc_list *idmap; | |
3981 | ||
3982 | idmap = get_minimal_idmap(conf); | |
3983 | if (!idmap) | |
3984 | return -1; | |
3985 | ||
3986 | ret = pipe(p); | |
3987 | if (ret < 0) { | |
3988 | SYSERROR("Failed to create pipe"); | |
3989 | return -1; | |
3990 | } | |
3991 | d.fn = fn; | |
3992 | d.fn_name = fn_name; | |
3993 | d.arg = data; | |
3994 | d.p[0] = p[0]; | |
3995 | d.p[1] = p[1]; | |
3996 | ||
3997 | /* Clone child in new user namespace. */ | |
3998 | pid = lxc_raw_clone_cb(run_userns_fn, &d, CLONE_NEWUSER); | |
3999 | if (pid < 0) { | |
4000 | ERROR("failed to clone child process in new user namespace"); | |
4001 | goto on_error; | |
4002 | } | |
4003 | ||
4004 | close(p[0]); | |
4005 | p[0] = -1; | |
4006 | ||
4b73005c CB |
4007 | if (lxc_log_get_level() == LXC_LOG_LEVEL_TRACE || |
4008 | conf->loglevel == LXC_LOG_LEVEL_TRACE) { | |
dcf0ffdf CB |
4009 | struct lxc_list *it; |
4010 | struct id_map *map; | |
4011 | ||
f8aa4bf3 CB |
4012 | lxc_list_for_each(it, idmap) { |
4013 | map = it->elem; | |
dcf0ffdf | 4014 | TRACE("Establishing %cid mapping for \"%d\" in new " |
f8aa4bf3 | 4015 | "user namespace: nsuid %lu - hostid %lu - range " |
dcf0ffdf CB |
4016 | "%lu", (map->idtype == ID_TYPE_UID) ? 'u' : 'g', |
4017 | pid, map->nsid, map->hostid, map->range); | |
f8aa4bf3 | 4018 | } |
4355ab5f SH |
4019 | } |
4020 | ||
f8aa4bf3 | 4021 | /* Set up {g,u}id mapping for user namespace of child process. */ |
4355ab5f | 4022 | ret = lxc_map_ids(idmap, pid); |
f8aa4bf3 | 4023 | if (ret < 0) { |
dcf0ffdf | 4024 | ERROR("Error setting up {g,u}id mappings for child process " |
415a8851 | 4025 | "\"%d\"", pid); |
f8aa4bf3 | 4026 | goto on_error; |
4355ab5f SH |
4027 | } |
4028 | ||
f8aa4bf3 | 4029 | /* Tell child to proceed. */ |
4355ab5f | 4030 | if (write(p[1], &c, 1) != 1) { |
dcf0ffdf | 4031 | SYSERROR("Failed telling child process \"%d\" to proceed", pid); |
f8aa4bf3 | 4032 | goto on_error; |
4355ab5f SH |
4033 | } |
4034 | ||
686dd5d1 | 4035 | on_error: |
f8aa4bf3 | 4036 | /* Wait for child to finish. */ |
686dd5d1 CB |
4037 | if (pid > 0) |
4038 | status = wait_for_pid(pid); | |
3139aead | 4039 | |
4355ab5f SH |
4040 | if (p[0] != -1) |
4041 | close(p[0]); | |
4042 | close(p[1]); | |
f8aa4bf3 | 4043 | |
686dd5d1 CB |
4044 | if (status < 0) |
4045 | ret = -1; | |
4046 | ||
f8aa4bf3 | 4047 | return ret; |
4355ab5f | 4048 | } |
97e9cfa0 | 4049 | |
415a8851 CB |
4050 | int userns_exec_full(struct lxc_conf *conf, int (*fn)(void *), void *data, |
4051 | const char *fn_name) | |
4052 | { | |
4053 | pid_t pid; | |
4054 | uid_t euid, egid; | |
4055 | struct userns_fn_data d; | |
4056 | int p[2]; | |
4057 | struct id_map *map; | |
4058 | struct lxc_list *cur; | |
4059 | char c = '1'; | |
4060 | int ret = -1; | |
4061 | struct lxc_list *idmap = NULL, *tmplist = NULL; | |
4062 | struct id_map *container_root_uid = NULL, *container_root_gid = NULL, | |
4063 | *host_uid_map = NULL, *host_gid_map = NULL; | |
4064 | ||
4065 | ret = pipe(p); | |
4066 | if (ret < 0) { | |
4067 | SYSERROR("opening pipe"); | |
4068 | return -1; | |
4069 | } | |
4070 | d.fn = fn; | |
4071 | d.fn_name = fn_name; | |
4072 | d.arg = data; | |
4073 | d.p[0] = p[0]; | |
4074 | d.p[1] = p[1]; | |
4075 | ||
4076 | /* Clone child in new user namespace. */ | |
4077 | pid = lxc_clone(run_userns_fn, &d, CLONE_NEWUSER); | |
4078 | if (pid < 0) { | |
4079 | ERROR("failed to clone child process in new user namespace"); | |
4080 | goto on_error; | |
4081 | } | |
4082 | ||
4083 | close(p[0]); | |
4084 | p[0] = -1; | |
4085 | ||
4086 | euid = geteuid(); | |
4087 | egid = getegid(); | |
4088 | ||
4089 | /* Allocate new {g,u}id map list. */ | |
4090 | idmap = malloc(sizeof(*idmap)); | |
4091 | if (!idmap) | |
4092 | goto on_error; | |
4093 | lxc_list_init(idmap); | |
4094 | ||
4095 | /* Find container root. */ | |
4096 | lxc_list_for_each(cur, &conf->id_map) { | |
4097 | struct id_map *tmpmap; | |
4098 | ||
4099 | tmplist = malloc(sizeof(*tmplist)); | |
4100 | if (!tmplist) | |
4101 | goto on_error; | |
4102 | ||
4103 | tmpmap = malloc(sizeof(*tmpmap)); | |
4104 | if (!tmpmap) { | |
4105 | free(tmplist); | |
4106 | goto on_error; | |
4107 | } | |
4108 | ||
4109 | memset(tmpmap, 0, sizeof(*tmpmap)); | |
4110 | memcpy(tmpmap, cur->elem, sizeof(*tmpmap)); | |
4111 | tmplist->elem = tmpmap; | |
4112 | ||
4113 | lxc_list_add_tail(idmap, tmplist); | |
4114 | ||
4115 | map = cur->elem; | |
4116 | ||
4117 | if (map->idtype == ID_TYPE_UID) | |
4118 | if (euid >= map->hostid && euid < map->hostid + map->range) | |
4119 | host_uid_map = map; | |
4120 | ||
4121 | if (map->idtype == ID_TYPE_GID) | |
4122 | if (egid >= map->hostid && egid < map->hostid + map->range) | |
4123 | host_gid_map = map; | |
4124 | ||
4125 | if (map->nsid != 0) | |
4126 | continue; | |
4127 | ||
4128 | if (map->idtype == ID_TYPE_UID) | |
4129 | if (container_root_uid == NULL) | |
4130 | container_root_uid = map; | |
4131 | ||
4132 | if (map->idtype == ID_TYPE_GID) | |
4133 | if (container_root_gid == NULL) | |
4134 | container_root_gid = map; | |
4135 | } | |
4136 | ||
4137 | if (!container_root_uid || !container_root_gid) { | |
4138 | ERROR("No mapping for container root found"); | |
4139 | goto on_error; | |
4140 | } | |
4141 | ||
4142 | /* Check whether the {g,u}id of the user has a mapping. */ | |
4143 | if (!host_uid_map) | |
c4333195 | 4144 | host_uid_map = mapped_hostid_add(conf, euid, ID_TYPE_UID); |
415a8851 CB |
4145 | else |
4146 | host_uid_map = container_root_uid; | |
4147 | ||
4148 | if (!host_gid_map) | |
c4333195 | 4149 | host_gid_map = mapped_hostid_add(conf, egid, ID_TYPE_GID); |
415a8851 CB |
4150 | else |
4151 | host_gid_map = container_root_gid; | |
4152 | ||
4153 | if (!host_uid_map) { | |
4154 | DEBUG("Failed to find mapping for uid %d", euid); | |
4155 | goto on_error; | |
4156 | } | |
4157 | ||
4158 | if (!host_gid_map) { | |
4159 | DEBUG("Failed to find mapping for gid %d", egid); | |
4160 | goto on_error; | |
4161 | } | |
4162 | ||
4163 | if (host_uid_map && (host_uid_map != container_root_uid)) { | |
4164 | /* Add container root to the map. */ | |
4165 | tmplist = malloc(sizeof(*tmplist)); | |
4166 | if (!tmplist) | |
4167 | goto on_error; | |
4168 | lxc_list_add_elem(tmplist, host_uid_map); | |
4169 | lxc_list_add_tail(idmap, tmplist); | |
4170 | } | |
4171 | /* idmap will now keep track of that memory. */ | |
4172 | host_uid_map = NULL; | |
4173 | ||
4174 | if (host_gid_map && (host_gid_map != container_root_gid)) { | |
4175 | tmplist = malloc(sizeof(*tmplist)); | |
4176 | if (!tmplist) | |
4177 | goto on_error; | |
4178 | lxc_list_add_elem(tmplist, host_gid_map); | |
4179 | lxc_list_add_tail(idmap, tmplist); | |
4180 | } | |
4181 | /* idmap will now keep track of that memory. */ | |
4182 | host_gid_map = NULL; | |
4183 | ||
4184 | if (lxc_log_get_level() == LXC_LOG_LEVEL_TRACE || | |
4185 | conf->loglevel == LXC_LOG_LEVEL_TRACE) { | |
4186 | lxc_list_for_each(cur, idmap) { | |
4187 | map = cur->elem; | |
4188 | TRACE("establishing %cid mapping for \"%d\" in new " | |
4189 | "user namespace: nsuid %lu - hostid %lu - range " | |
4190 | "%lu", | |
4191 | (map->idtype == ID_TYPE_UID) ? 'u' : 'g', pid, | |
4192 | map->nsid, map->hostid, map->range); | |
4193 | } | |
4194 | } | |
4195 | ||
4196 | /* Set up {g,u}id mapping for user namespace of child process. */ | |
4197 | ret = lxc_map_ids(idmap, pid); | |
4198 | if (ret < 0) { | |
4199 | ERROR("error setting up {g,u}id mappings for child process " | |
4200 | "\"%d\"", pid); | |
4201 | goto on_error; | |
4202 | } | |
4203 | ||
4204 | /* Tell child to proceed. */ | |
4205 | if (write(p[1], &c, 1) != 1) { | |
4206 | SYSERROR("failed telling child process \"%d\" to proceed", pid); | |
4207 | goto on_error; | |
4208 | } | |
4209 | ||
686dd5d1 | 4210 | on_error: |
415a8851 | 4211 | /* Wait for child to finish. */ |
686dd5d1 CB |
4212 | if (pid > 0) |
4213 | ret = wait_for_pid(pid); | |
415a8851 | 4214 | |
415a8851 CB |
4215 | if (idmap) |
4216 | lxc_free_idmap(idmap); | |
4217 | if (host_uid_map && (host_uid_map != container_root_uid)) | |
4218 | free(host_uid_map); | |
4219 | if (host_gid_map && (host_gid_map != container_root_gid)) | |
4220 | free(host_gid_map); | |
4221 | ||
4222 | if (p[0] != -1) | |
4223 | close(p[0]); | |
4224 | close(p[1]); | |
4225 | ||
4226 | return ret; | |
4227 | } | |
4228 | ||
a96a8e8c | 4229 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4230 | static char* getuname(void) |
4231 | { | |
a96a8e8c | 4232 | struct passwd *result; |
97e9cfa0 | 4233 | |
a96a8e8c SH |
4234 | result = getpwuid(geteuid()); |
4235 | if (!result) | |
97e9cfa0 SH |
4236 | return NULL; |
4237 | ||
a96a8e8c | 4238 | return strdup(result->pw_name); |
97e9cfa0 SH |
4239 | } |
4240 | ||
a96a8e8c | 4241 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4242 | static char *getgname(void) |
4243 | { | |
a96a8e8c | 4244 | struct group *result; |
97e9cfa0 | 4245 | |
a96a8e8c SH |
4246 | result = getgrgid(getegid()); |
4247 | if (!result) | |
97e9cfa0 SH |
4248 | return NULL; |
4249 | ||
a96a8e8c | 4250 | return strdup(result->gr_name); |
97e9cfa0 SH |
4251 | } |
4252 | ||
a96a8e8c | 4253 | /* not thread-safe, do not use from api without first forking */ |
97e9cfa0 SH |
4254 | void suggest_default_idmap(void) |
4255 | { | |
4256 | FILE *f; | |
4257 | unsigned int uid = 0, urange = 0, gid = 0, grange = 0; | |
4258 | char *line = NULL; | |
4259 | char *uname, *gname; | |
4260 | size_t len = 0; | |
4261 | ||
4262 | if (!(uname = getuname())) | |
4263 | return; | |
4264 | ||
4265 | if (!(gname = getgname())) { | |
4266 | free(uname); | |
4267 | return; | |
4268 | } | |
4269 | ||
4270 | f = fopen(subuidfile, "r"); | |
4271 | if (!f) { | |
4272 | ERROR("Your system is not configured with subuids"); | |
4273 | free(gname); | |
4274 | free(uname); | |
4275 | return; | |
4276 | } | |
4277 | while (getline(&line, &len, f) != -1) { | |
b7930180 | 4278 | size_t no_newline = 0; |
97e9cfa0 SH |
4279 | char *p = strchr(line, ':'), *p2; |
4280 | if (*line == '#') | |
4281 | continue; | |
4282 | if (!p) | |
4283 | continue; | |
4284 | *p = '\0'; | |
4285 | p++; | |
4286 | if (strcmp(line, uname)) | |
4287 | continue; | |
4288 | p2 = strchr(p, ':'); | |
4289 | if (!p2) | |
4290 | continue; | |
4291 | *p2 = '\0'; | |
4292 | p2++; | |
4293 | if (!*p2) | |
4294 | continue; | |
b7930180 CB |
4295 | no_newline = strcspn(p2, "\n"); |
4296 | p2[no_newline] = '\0'; | |
4297 | ||
b7b2fde4 CB |
4298 | if (lxc_safe_uint(p, &uid) < 0) |
4299 | WARN("Could not parse UID."); | |
4300 | if (lxc_safe_uint(p2, &urange) < 0) | |
4301 | WARN("Could not parse UID range."); | |
97e9cfa0 SH |
4302 | } |
4303 | fclose(f); | |
4304 | ||
6be7389a | 4305 | f = fopen(subgidfile, "r"); |
97e9cfa0 SH |
4306 | if (!f) { |
4307 | ERROR("Your system is not configured with subgids"); | |
4308 | free(gname); | |
4309 | free(uname); | |
4310 | return; | |
4311 | } | |
4312 | while (getline(&line, &len, f) != -1) { | |
b7930180 | 4313 | size_t no_newline = 0; |
97e9cfa0 SH |
4314 | char *p = strchr(line, ':'), *p2; |
4315 | if (*line == '#') | |
4316 | continue; | |
4317 | if (!p) | |
4318 | continue; | |
4319 | *p = '\0'; | |
4320 | p++; | |
4321 | if (strcmp(line, uname)) | |
4322 | continue; | |
4323 | p2 = strchr(p, ':'); | |
4324 | if (!p2) | |
4325 | continue; | |
4326 | *p2 = '\0'; | |
4327 | p2++; | |
4328 | if (!*p2) | |
4329 | continue; | |
b7930180 CB |
4330 | no_newline = strcspn(p2, "\n"); |
4331 | p2[no_newline] = '\0'; | |
4332 | ||
b7b2fde4 CB |
4333 | if (lxc_safe_uint(p, &gid) < 0) |
4334 | WARN("Could not parse GID."); | |
4335 | if (lxc_safe_uint(p2, &grange) < 0) | |
4336 | WARN("Could not parse GID range."); | |
97e9cfa0 SH |
4337 | } |
4338 | fclose(f); | |
4339 | ||
f10fad2f | 4340 | free(line); |
97e9cfa0 SH |
4341 | |
4342 | if (!urange || !grange) { | |
4343 | ERROR("You do not have subuids or subgids allocated"); | |
4344 | ERROR("Unprivileged containers require subuids and subgids"); | |
4345 | return; | |
4346 | } | |
4347 | ||
4348 | ERROR("You must either run as root, or define uid mappings"); | |
4349 | ERROR("To pass uid mappings to lxc-create, you could create"); | |
4350 | ERROR("~/.config/lxc/default.conf:"); | |
4351 | ERROR("lxc.include = %s", LXC_DEFAULT_CONFIG); | |
bdcbb6b3 CB |
4352 | ERROR("lxc.idmap = u 0 %u %u", uid, urange); |
4353 | ERROR("lxc.idmap = g 0 %u %u", gid, grange); | |
97e9cfa0 SH |
4354 | |
4355 | free(gname); | |
4356 | free(uname); | |
4357 | } | |
aaf26830 | 4358 | |
a7307747 SH |
4359 | static void free_cgroup_settings(struct lxc_list *result) |
4360 | { | |
4361 | struct lxc_list *iterator, *next; | |
4362 | ||
4363 | lxc_list_for_each_safe(iterator, result, next) { | |
4364 | lxc_list_del(iterator); | |
4365 | free(iterator); | |
4366 | } | |
4367 | free(result); | |
4368 | } | |
4369 | ||
aaf26830 KT |
4370 | /* |
4371 | * Return the list of cgroup_settings sorted according to the following rules | |
4372 | * 1. Put memory.limit_in_bytes before memory.memsw.limit_in_bytes | |
4373 | */ | |
4374 | struct lxc_list *sort_cgroup_settings(struct lxc_list* cgroup_settings) | |
4375 | { | |
4376 | struct lxc_list *result; | |
4377 | struct lxc_list *memsw_limit = NULL; | |
4378 | struct lxc_list *it = NULL; | |
4379 | struct lxc_cgroup *cg = NULL; | |
4380 | struct lxc_list *item = NULL; | |
4381 | ||
4382 | result = malloc(sizeof(*result)); | |
fac7c663 KT |
4383 | if (!result) { |
4384 | ERROR("failed to allocate memory to sort cgroup settings"); | |
4385 | return NULL; | |
4386 | } | |
aaf26830 KT |
4387 | lxc_list_init(result); |
4388 | ||
4389 | /*Iterate over the cgroup settings and copy them to the output list*/ | |
4390 | lxc_list_for_each(it, cgroup_settings) { | |
4391 | item = malloc(sizeof(*item)); | |
fac7c663 KT |
4392 | if (!item) { |
4393 | ERROR("failed to allocate memory to sort cgroup settings"); | |
a7307747 | 4394 | free_cgroup_settings(result); |
fac7c663 KT |
4395 | return NULL; |
4396 | } | |
aaf26830 KT |
4397 | item->elem = it->elem; |
4398 | cg = it->elem; | |
4399 | if (strcmp(cg->subsystem, "memory.memsw.limit_in_bytes") == 0) { | |
4400 | /* Store the memsw_limit location */ | |
4401 | memsw_limit = item; | |
4402 | } else if (strcmp(cg->subsystem, "memory.limit_in_bytes") == 0 && memsw_limit != NULL) { | |
4d5b72a1 | 4403 | /* lxc.cgroup.memory.memsw.limit_in_bytes is found before |
aaf26830 KT |
4404 | * lxc.cgroup.memory.limit_in_bytes, swap these two items */ |
4405 | item->elem = memsw_limit->elem; | |
4406 | memsw_limit->elem = it->elem; | |
4407 | } | |
4408 | lxc_list_add_tail(result, item); | |
4409 | } | |
4410 | ||
4411 | return result; | |
a7307747 | 4412 | } |