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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/kernel/sys.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | */ | |
6 | ||
9984de1a | 7 | #include <linux/export.h> |
1da177e4 LT |
8 | #include <linux/mm.h> |
9 | #include <linux/utsname.h> | |
10 | #include <linux/mman.h> | |
1da177e4 LT |
11 | #include <linux/reboot.h> |
12 | #include <linux/prctl.h> | |
1da177e4 LT |
13 | #include <linux/highuid.h> |
14 | #include <linux/fs.h> | |
74da1ff7 | 15 | #include <linux/kmod.h> |
cdd6c482 | 16 | #include <linux/perf_event.h> |
3e88c553 | 17 | #include <linux/resource.h> |
dc009d92 | 18 | #include <linux/kernel.h> |
1da177e4 | 19 | #include <linux/workqueue.h> |
c59ede7b | 20 | #include <linux/capability.h> |
1da177e4 LT |
21 | #include <linux/device.h> |
22 | #include <linux/key.h> | |
23 | #include <linux/times.h> | |
24 | #include <linux/posix-timers.h> | |
25 | #include <linux/security.h> | |
26 | #include <linux/dcookies.h> | |
27 | #include <linux/suspend.h> | |
28 | #include <linux/tty.h> | |
7ed20e1a | 29 | #include <linux/signal.h> |
9f46080c | 30 | #include <linux/cn_proc.h> |
3cfc348b | 31 | #include <linux/getcpu.h> |
6eaeeaba | 32 | #include <linux/task_io_accounting_ops.h> |
1d9d02fe | 33 | #include <linux/seccomp.h> |
4047727e | 34 | #include <linux/cpu.h> |
e28cbf22 | 35 | #include <linux/personality.h> |
e3d5a27d | 36 | #include <linux/ptrace.h> |
5ad4e53b | 37 | #include <linux/fs_struct.h> |
b32dfe37 CG |
38 | #include <linux/file.h> |
39 | #include <linux/mount.h> | |
5a0e3ad6 | 40 | #include <linux/gfp.h> |
40dc166c | 41 | #include <linux/syscore_ops.h> |
be27425d AK |
42 | #include <linux/version.h> |
43 | #include <linux/ctype.h> | |
1da177e4 LT |
44 | |
45 | #include <linux/compat.h> | |
46 | #include <linux/syscalls.h> | |
00d7c05a | 47 | #include <linux/kprobes.h> |
acce292c | 48 | #include <linux/user_namespace.h> |
7fe5e042 | 49 | #include <linux/binfmts.h> |
1da177e4 | 50 | |
4a22f166 | 51 | #include <linux/sched.h> |
4eb5aaa3 | 52 | #include <linux/sched/autogroup.h> |
4f17722c | 53 | #include <linux/sched/loadavg.h> |
03441a34 | 54 | #include <linux/sched/stat.h> |
6e84f315 | 55 | #include <linux/sched/mm.h> |
f7ccbae4 | 56 | #include <linux/sched/coredump.h> |
29930025 | 57 | #include <linux/sched/task.h> |
32ef5517 | 58 | #include <linux/sched/cputime.h> |
4a22f166 SR |
59 | #include <linux/rcupdate.h> |
60 | #include <linux/uidgid.h> | |
61 | #include <linux/cred.h> | |
62 | ||
04c6862c | 63 | #include <linux/kmsg_dump.h> |
be27425d AK |
64 | /* Move somewhere else to avoid recompiling? */ |
65 | #include <generated/utsrelease.h> | |
04c6862c | 66 | |
7c0f6ba6 | 67 | #include <linux/uaccess.h> |
1da177e4 LT |
68 | #include <asm/io.h> |
69 | #include <asm/unistd.h> | |
70 | ||
71 | #ifndef SET_UNALIGN_CTL | |
ec94fc3d | 72 | # define SET_UNALIGN_CTL(a, b) (-EINVAL) |
1da177e4 LT |
73 | #endif |
74 | #ifndef GET_UNALIGN_CTL | |
ec94fc3d | 75 | # define GET_UNALIGN_CTL(a, b) (-EINVAL) |
1da177e4 LT |
76 | #endif |
77 | #ifndef SET_FPEMU_CTL | |
ec94fc3d | 78 | # define SET_FPEMU_CTL(a, b) (-EINVAL) |
1da177e4 LT |
79 | #endif |
80 | #ifndef GET_FPEMU_CTL | |
ec94fc3d | 81 | # define GET_FPEMU_CTL(a, b) (-EINVAL) |
1da177e4 LT |
82 | #endif |
83 | #ifndef SET_FPEXC_CTL | |
ec94fc3d | 84 | # define SET_FPEXC_CTL(a, b) (-EINVAL) |
1da177e4 LT |
85 | #endif |
86 | #ifndef GET_FPEXC_CTL | |
ec94fc3d | 87 | # define GET_FPEXC_CTL(a, b) (-EINVAL) |
1da177e4 | 88 | #endif |
651d765d | 89 | #ifndef GET_ENDIAN |
ec94fc3d | 90 | # define GET_ENDIAN(a, b) (-EINVAL) |
651d765d AB |
91 | #endif |
92 | #ifndef SET_ENDIAN | |
ec94fc3d | 93 | # define SET_ENDIAN(a, b) (-EINVAL) |
651d765d | 94 | #endif |
8fb402bc EB |
95 | #ifndef GET_TSC_CTL |
96 | # define GET_TSC_CTL(a) (-EINVAL) | |
97 | #endif | |
98 | #ifndef SET_TSC_CTL | |
99 | # define SET_TSC_CTL(a) (-EINVAL) | |
100 | #endif | |
fe3d197f | 101 | #ifndef MPX_ENABLE_MANAGEMENT |
46a6e0cf | 102 | # define MPX_ENABLE_MANAGEMENT() (-EINVAL) |
fe3d197f DH |
103 | #endif |
104 | #ifndef MPX_DISABLE_MANAGEMENT | |
46a6e0cf | 105 | # define MPX_DISABLE_MANAGEMENT() (-EINVAL) |
fe3d197f | 106 | #endif |
9791554b PB |
107 | #ifndef GET_FP_MODE |
108 | # define GET_FP_MODE(a) (-EINVAL) | |
109 | #endif | |
110 | #ifndef SET_FP_MODE | |
111 | # define SET_FP_MODE(a,b) (-EINVAL) | |
112 | #endif | |
1da177e4 LT |
113 | |
114 | /* | |
115 | * this is where the system-wide overflow UID and GID are defined, for | |
116 | * architectures that now have 32-bit UID/GID but didn't in the past | |
117 | */ | |
118 | ||
119 | int overflowuid = DEFAULT_OVERFLOWUID; | |
120 | int overflowgid = DEFAULT_OVERFLOWGID; | |
121 | ||
1da177e4 LT |
122 | EXPORT_SYMBOL(overflowuid); |
123 | EXPORT_SYMBOL(overflowgid); | |
1da177e4 LT |
124 | |
125 | /* | |
126 | * the same as above, but for filesystems which can only store a 16-bit | |
127 | * UID and GID. as such, this is needed on all architectures | |
128 | */ | |
129 | ||
130 | int fs_overflowuid = DEFAULT_FS_OVERFLOWUID; | |
131 | int fs_overflowgid = DEFAULT_FS_OVERFLOWUID; | |
132 | ||
133 | EXPORT_SYMBOL(fs_overflowuid); | |
134 | EXPORT_SYMBOL(fs_overflowgid); | |
135 | ||
fc832ad3 SH |
136 | /* |
137 | * Returns true if current's euid is same as p's uid or euid, | |
138 | * or has CAP_SYS_NICE to p's user_ns. | |
139 | * | |
140 | * Called with rcu_read_lock, creds are safe | |
141 | */ | |
142 | static bool set_one_prio_perm(struct task_struct *p) | |
143 | { | |
144 | const struct cred *cred = current_cred(), *pcred = __task_cred(p); | |
145 | ||
5af66203 EB |
146 | if (uid_eq(pcred->uid, cred->euid) || |
147 | uid_eq(pcred->euid, cred->euid)) | |
fc832ad3 | 148 | return true; |
c4a4d603 | 149 | if (ns_capable(pcred->user_ns, CAP_SYS_NICE)) |
fc832ad3 SH |
150 | return true; |
151 | return false; | |
152 | } | |
153 | ||
c69e8d9c DH |
154 | /* |
155 | * set the priority of a task | |
156 | * - the caller must hold the RCU read lock | |
157 | */ | |
1da177e4 LT |
158 | static int set_one_prio(struct task_struct *p, int niceval, int error) |
159 | { | |
160 | int no_nice; | |
161 | ||
fc832ad3 | 162 | if (!set_one_prio_perm(p)) { |
1da177e4 LT |
163 | error = -EPERM; |
164 | goto out; | |
165 | } | |
e43379f1 | 166 | if (niceval < task_nice(p) && !can_nice(p, niceval)) { |
1da177e4 LT |
167 | error = -EACCES; |
168 | goto out; | |
169 | } | |
170 | no_nice = security_task_setnice(p, niceval); | |
171 | if (no_nice) { | |
172 | error = no_nice; | |
173 | goto out; | |
174 | } | |
175 | if (error == -ESRCH) | |
176 | error = 0; | |
177 | set_user_nice(p, niceval); | |
178 | out: | |
179 | return error; | |
180 | } | |
181 | ||
754fe8d2 | 182 | SYSCALL_DEFINE3(setpriority, int, which, int, who, int, niceval) |
1da177e4 LT |
183 | { |
184 | struct task_struct *g, *p; | |
185 | struct user_struct *user; | |
86a264ab | 186 | const struct cred *cred = current_cred(); |
1da177e4 | 187 | int error = -EINVAL; |
41487c65 | 188 | struct pid *pgrp; |
7b44ab97 | 189 | kuid_t uid; |
1da177e4 | 190 | |
3e88c553 | 191 | if (which > PRIO_USER || which < PRIO_PROCESS) |
1da177e4 LT |
192 | goto out; |
193 | ||
194 | /* normalize: avoid signed division (rounding problems) */ | |
195 | error = -ESRCH; | |
c4a4d2f4 DY |
196 | if (niceval < MIN_NICE) |
197 | niceval = MIN_NICE; | |
198 | if (niceval > MAX_NICE) | |
199 | niceval = MAX_NICE; | |
1da177e4 | 200 | |
d4581a23 | 201 | rcu_read_lock(); |
1da177e4 LT |
202 | read_lock(&tasklist_lock); |
203 | switch (which) { | |
ec94fc3d | 204 | case PRIO_PROCESS: |
205 | if (who) | |
206 | p = find_task_by_vpid(who); | |
207 | else | |
208 | p = current; | |
209 | if (p) | |
210 | error = set_one_prio(p, niceval, error); | |
211 | break; | |
212 | case PRIO_PGRP: | |
213 | if (who) | |
214 | pgrp = find_vpid(who); | |
215 | else | |
216 | pgrp = task_pgrp(current); | |
217 | do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { | |
218 | error = set_one_prio(p, niceval, error); | |
219 | } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); | |
220 | break; | |
221 | case PRIO_USER: | |
222 | uid = make_kuid(cred->user_ns, who); | |
223 | user = cred->user; | |
224 | if (!who) | |
225 | uid = cred->uid; | |
226 | else if (!uid_eq(uid, cred->uid)) { | |
227 | user = find_user(uid); | |
228 | if (!user) | |
86a264ab | 229 | goto out_unlock; /* No processes for this user */ |
ec94fc3d | 230 | } |
231 | do_each_thread(g, p) { | |
8639b461 | 232 | if (uid_eq(task_uid(p), uid) && task_pid_vnr(p)) |
ec94fc3d | 233 | error = set_one_prio(p, niceval, error); |
234 | } while_each_thread(g, p); | |
235 | if (!uid_eq(uid, cred->uid)) | |
236 | free_uid(user); /* For find_user() */ | |
237 | break; | |
1da177e4 LT |
238 | } |
239 | out_unlock: | |
240 | read_unlock(&tasklist_lock); | |
d4581a23 | 241 | rcu_read_unlock(); |
1da177e4 LT |
242 | out: |
243 | return error; | |
244 | } | |
245 | ||
246 | /* | |
247 | * Ugh. To avoid negative return values, "getpriority()" will | |
248 | * not return the normal nice-value, but a negated value that | |
249 | * has been offset by 20 (ie it returns 40..1 instead of -20..19) | |
250 | * to stay compatible. | |
251 | */ | |
754fe8d2 | 252 | SYSCALL_DEFINE2(getpriority, int, which, int, who) |
1da177e4 LT |
253 | { |
254 | struct task_struct *g, *p; | |
255 | struct user_struct *user; | |
86a264ab | 256 | const struct cred *cred = current_cred(); |
1da177e4 | 257 | long niceval, retval = -ESRCH; |
41487c65 | 258 | struct pid *pgrp; |
7b44ab97 | 259 | kuid_t uid; |
1da177e4 | 260 | |
3e88c553 | 261 | if (which > PRIO_USER || which < PRIO_PROCESS) |
1da177e4 LT |
262 | return -EINVAL; |
263 | ||
70118837 | 264 | rcu_read_lock(); |
1da177e4 LT |
265 | read_lock(&tasklist_lock); |
266 | switch (which) { | |
ec94fc3d | 267 | case PRIO_PROCESS: |
268 | if (who) | |
269 | p = find_task_by_vpid(who); | |
270 | else | |
271 | p = current; | |
272 | if (p) { | |
273 | niceval = nice_to_rlimit(task_nice(p)); | |
274 | if (niceval > retval) | |
275 | retval = niceval; | |
276 | } | |
277 | break; | |
278 | case PRIO_PGRP: | |
279 | if (who) | |
280 | pgrp = find_vpid(who); | |
281 | else | |
282 | pgrp = task_pgrp(current); | |
283 | do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { | |
284 | niceval = nice_to_rlimit(task_nice(p)); | |
285 | if (niceval > retval) | |
286 | retval = niceval; | |
287 | } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); | |
288 | break; | |
289 | case PRIO_USER: | |
290 | uid = make_kuid(cred->user_ns, who); | |
291 | user = cred->user; | |
292 | if (!who) | |
293 | uid = cred->uid; | |
294 | else if (!uid_eq(uid, cred->uid)) { | |
295 | user = find_user(uid); | |
296 | if (!user) | |
297 | goto out_unlock; /* No processes for this user */ | |
298 | } | |
299 | do_each_thread(g, p) { | |
8639b461 | 300 | if (uid_eq(task_uid(p), uid) && task_pid_vnr(p)) { |
7aa2c016 | 301 | niceval = nice_to_rlimit(task_nice(p)); |
1da177e4 LT |
302 | if (niceval > retval) |
303 | retval = niceval; | |
304 | } | |
ec94fc3d | 305 | } while_each_thread(g, p); |
306 | if (!uid_eq(uid, cred->uid)) | |
307 | free_uid(user); /* for find_user() */ | |
308 | break; | |
1da177e4 LT |
309 | } |
310 | out_unlock: | |
311 | read_unlock(&tasklist_lock); | |
70118837 | 312 | rcu_read_unlock(); |
1da177e4 LT |
313 | |
314 | return retval; | |
315 | } | |
316 | ||
1da177e4 LT |
317 | /* |
318 | * Unprivileged users may change the real gid to the effective gid | |
319 | * or vice versa. (BSD-style) | |
320 | * | |
321 | * If you set the real gid at all, or set the effective gid to a value not | |
322 | * equal to the real gid, then the saved gid is set to the new effective gid. | |
323 | * | |
324 | * This makes it possible for a setgid program to completely drop its | |
325 | * privileges, which is often a useful assertion to make when you are doing | |
326 | * a security audit over a program. | |
327 | * | |
328 | * The general idea is that a program which uses just setregid() will be | |
329 | * 100% compatible with BSD. A program which uses just setgid() will be | |
ec94fc3d | 330 | * 100% compatible with POSIX with saved IDs. |
1da177e4 LT |
331 | * |
332 | * SMP: There are not races, the GIDs are checked only by filesystem | |
333 | * operations (as far as semantic preservation is concerned). | |
334 | */ | |
2813893f | 335 | #ifdef CONFIG_MULTIUSER |
ae1251ab | 336 | SYSCALL_DEFINE2(setregid, gid_t, rgid, gid_t, egid) |
1da177e4 | 337 | { |
a29c33f4 | 338 | struct user_namespace *ns = current_user_ns(); |
d84f4f99 DH |
339 | const struct cred *old; |
340 | struct cred *new; | |
1da177e4 | 341 | int retval; |
a29c33f4 EB |
342 | kgid_t krgid, kegid; |
343 | ||
344 | krgid = make_kgid(ns, rgid); | |
345 | kegid = make_kgid(ns, egid); | |
346 | ||
347 | if ((rgid != (gid_t) -1) && !gid_valid(krgid)) | |
348 | return -EINVAL; | |
349 | if ((egid != (gid_t) -1) && !gid_valid(kegid)) | |
350 | return -EINVAL; | |
1da177e4 | 351 | |
d84f4f99 DH |
352 | new = prepare_creds(); |
353 | if (!new) | |
354 | return -ENOMEM; | |
355 | old = current_cred(); | |
356 | ||
d84f4f99 | 357 | retval = -EPERM; |
1da177e4 | 358 | if (rgid != (gid_t) -1) { |
a29c33f4 EB |
359 | if (gid_eq(old->gid, krgid) || |
360 | gid_eq(old->egid, krgid) || | |
c7b96acf | 361 | ns_capable(old->user_ns, CAP_SETGID)) |
a29c33f4 | 362 | new->gid = krgid; |
1da177e4 | 363 | else |
d84f4f99 | 364 | goto error; |
1da177e4 LT |
365 | } |
366 | if (egid != (gid_t) -1) { | |
a29c33f4 EB |
367 | if (gid_eq(old->gid, kegid) || |
368 | gid_eq(old->egid, kegid) || | |
369 | gid_eq(old->sgid, kegid) || | |
c7b96acf | 370 | ns_capable(old->user_ns, CAP_SETGID)) |
a29c33f4 | 371 | new->egid = kegid; |
756184b7 | 372 | else |
d84f4f99 | 373 | goto error; |
1da177e4 | 374 | } |
d84f4f99 | 375 | |
1da177e4 | 376 | if (rgid != (gid_t) -1 || |
a29c33f4 | 377 | (egid != (gid_t) -1 && !gid_eq(kegid, old->gid))) |
d84f4f99 DH |
378 | new->sgid = new->egid; |
379 | new->fsgid = new->egid; | |
380 | ||
381 | return commit_creds(new); | |
382 | ||
383 | error: | |
384 | abort_creds(new); | |
385 | return retval; | |
1da177e4 LT |
386 | } |
387 | ||
388 | /* | |
ec94fc3d | 389 | * setgid() is implemented like SysV w/ SAVED_IDS |
1da177e4 LT |
390 | * |
391 | * SMP: Same implicit races as above. | |
392 | */ | |
ae1251ab | 393 | SYSCALL_DEFINE1(setgid, gid_t, gid) |
1da177e4 | 394 | { |
a29c33f4 | 395 | struct user_namespace *ns = current_user_ns(); |
d84f4f99 DH |
396 | const struct cred *old; |
397 | struct cred *new; | |
1da177e4 | 398 | int retval; |
a29c33f4 EB |
399 | kgid_t kgid; |
400 | ||
401 | kgid = make_kgid(ns, gid); | |
402 | if (!gid_valid(kgid)) | |
403 | return -EINVAL; | |
1da177e4 | 404 | |
d84f4f99 DH |
405 | new = prepare_creds(); |
406 | if (!new) | |
407 | return -ENOMEM; | |
408 | old = current_cred(); | |
409 | ||
d84f4f99 | 410 | retval = -EPERM; |
c7b96acf | 411 | if (ns_capable(old->user_ns, CAP_SETGID)) |
a29c33f4 EB |
412 | new->gid = new->egid = new->sgid = new->fsgid = kgid; |
413 | else if (gid_eq(kgid, old->gid) || gid_eq(kgid, old->sgid)) | |
414 | new->egid = new->fsgid = kgid; | |
1da177e4 | 415 | else |
d84f4f99 | 416 | goto error; |
1da177e4 | 417 | |
d84f4f99 DH |
418 | return commit_creds(new); |
419 | ||
420 | error: | |
421 | abort_creds(new); | |
422 | return retval; | |
1da177e4 | 423 | } |
54e99124 | 424 | |
d84f4f99 DH |
425 | /* |
426 | * change the user struct in a credentials set to match the new UID | |
427 | */ | |
428 | static int set_user(struct cred *new) | |
1da177e4 LT |
429 | { |
430 | struct user_struct *new_user; | |
431 | ||
078de5f7 | 432 | new_user = alloc_uid(new->uid); |
1da177e4 LT |
433 | if (!new_user) |
434 | return -EAGAIN; | |
435 | ||
72fa5997 VK |
436 | /* |
437 | * We don't fail in case of NPROC limit excess here because too many | |
438 | * poorly written programs don't check set*uid() return code, assuming | |
439 | * it never fails if called by root. We may still enforce NPROC limit | |
440 | * for programs doing set*uid()+execve() by harmlessly deferring the | |
441 | * failure to the execve() stage. | |
442 | */ | |
78d7d407 | 443 | if (atomic_read(&new_user->processes) >= rlimit(RLIMIT_NPROC) && |
72fa5997 VK |
444 | new_user != INIT_USER) |
445 | current->flags |= PF_NPROC_EXCEEDED; | |
446 | else | |
447 | current->flags &= ~PF_NPROC_EXCEEDED; | |
1da177e4 | 448 | |
d84f4f99 DH |
449 | free_uid(new->user); |
450 | new->user = new_user; | |
1da177e4 LT |
451 | return 0; |
452 | } | |
453 | ||
454 | /* | |
455 | * Unprivileged users may change the real uid to the effective uid | |
456 | * or vice versa. (BSD-style) | |
457 | * | |
458 | * If you set the real uid at all, or set the effective uid to a value not | |
459 | * equal to the real uid, then the saved uid is set to the new effective uid. | |
460 | * | |
461 | * This makes it possible for a setuid program to completely drop its | |
462 | * privileges, which is often a useful assertion to make when you are doing | |
463 | * a security audit over a program. | |
464 | * | |
465 | * The general idea is that a program which uses just setreuid() will be | |
466 | * 100% compatible with BSD. A program which uses just setuid() will be | |
ec94fc3d | 467 | * 100% compatible with POSIX with saved IDs. |
1da177e4 | 468 | */ |
ae1251ab | 469 | SYSCALL_DEFINE2(setreuid, uid_t, ruid, uid_t, euid) |
1da177e4 | 470 | { |
a29c33f4 | 471 | struct user_namespace *ns = current_user_ns(); |
d84f4f99 DH |
472 | const struct cred *old; |
473 | struct cred *new; | |
1da177e4 | 474 | int retval; |
a29c33f4 EB |
475 | kuid_t kruid, keuid; |
476 | ||
477 | kruid = make_kuid(ns, ruid); | |
478 | keuid = make_kuid(ns, euid); | |
479 | ||
480 | if ((ruid != (uid_t) -1) && !uid_valid(kruid)) | |
481 | return -EINVAL; | |
482 | if ((euid != (uid_t) -1) && !uid_valid(keuid)) | |
483 | return -EINVAL; | |
1da177e4 | 484 | |
d84f4f99 DH |
485 | new = prepare_creds(); |
486 | if (!new) | |
487 | return -ENOMEM; | |
488 | old = current_cred(); | |
489 | ||
d84f4f99 | 490 | retval = -EPERM; |
1da177e4 | 491 | if (ruid != (uid_t) -1) { |
a29c33f4 EB |
492 | new->uid = kruid; |
493 | if (!uid_eq(old->uid, kruid) && | |
494 | !uid_eq(old->euid, kruid) && | |
c7b96acf | 495 | !ns_capable(old->user_ns, CAP_SETUID)) |
d84f4f99 | 496 | goto error; |
1da177e4 LT |
497 | } |
498 | ||
499 | if (euid != (uid_t) -1) { | |
a29c33f4 EB |
500 | new->euid = keuid; |
501 | if (!uid_eq(old->uid, keuid) && | |
502 | !uid_eq(old->euid, keuid) && | |
503 | !uid_eq(old->suid, keuid) && | |
c7b96acf | 504 | !ns_capable(old->user_ns, CAP_SETUID)) |
d84f4f99 | 505 | goto error; |
1da177e4 LT |
506 | } |
507 | ||
a29c33f4 | 508 | if (!uid_eq(new->uid, old->uid)) { |
54e99124 DG |
509 | retval = set_user(new); |
510 | if (retval < 0) | |
511 | goto error; | |
512 | } | |
1da177e4 | 513 | if (ruid != (uid_t) -1 || |
a29c33f4 | 514 | (euid != (uid_t) -1 && !uid_eq(keuid, old->uid))) |
d84f4f99 DH |
515 | new->suid = new->euid; |
516 | new->fsuid = new->euid; | |
1da177e4 | 517 | |
d84f4f99 DH |
518 | retval = security_task_fix_setuid(new, old, LSM_SETID_RE); |
519 | if (retval < 0) | |
520 | goto error; | |
1da177e4 | 521 | |
d84f4f99 | 522 | return commit_creds(new); |
1da177e4 | 523 | |
d84f4f99 DH |
524 | error: |
525 | abort_creds(new); | |
526 | return retval; | |
527 | } | |
ec94fc3d | 528 | |
1da177e4 | 529 | /* |
ec94fc3d | 530 | * setuid() is implemented like SysV with SAVED_IDS |
531 | * | |
1da177e4 | 532 | * Note that SAVED_ID's is deficient in that a setuid root program |
ec94fc3d | 533 | * like sendmail, for example, cannot set its uid to be a normal |
1da177e4 LT |
534 | * user and then switch back, because if you're root, setuid() sets |
535 | * the saved uid too. If you don't like this, blame the bright people | |
536 | * in the POSIX committee and/or USG. Note that the BSD-style setreuid() | |
537 | * will allow a root program to temporarily drop privileges and be able to | |
ec94fc3d | 538 | * regain them by swapping the real and effective uid. |
1da177e4 | 539 | */ |
ae1251ab | 540 | SYSCALL_DEFINE1(setuid, uid_t, uid) |
1da177e4 | 541 | { |
a29c33f4 | 542 | struct user_namespace *ns = current_user_ns(); |
d84f4f99 DH |
543 | const struct cred *old; |
544 | struct cred *new; | |
1da177e4 | 545 | int retval; |
a29c33f4 EB |
546 | kuid_t kuid; |
547 | ||
548 | kuid = make_kuid(ns, uid); | |
549 | if (!uid_valid(kuid)) | |
550 | return -EINVAL; | |
1da177e4 | 551 | |
d84f4f99 DH |
552 | new = prepare_creds(); |
553 | if (!new) | |
554 | return -ENOMEM; | |
555 | old = current_cred(); | |
556 | ||
d84f4f99 | 557 | retval = -EPERM; |
c7b96acf | 558 | if (ns_capable(old->user_ns, CAP_SETUID)) { |
a29c33f4 EB |
559 | new->suid = new->uid = kuid; |
560 | if (!uid_eq(kuid, old->uid)) { | |
54e99124 DG |
561 | retval = set_user(new); |
562 | if (retval < 0) | |
563 | goto error; | |
d84f4f99 | 564 | } |
a29c33f4 | 565 | } else if (!uid_eq(kuid, old->uid) && !uid_eq(kuid, new->suid)) { |
d84f4f99 | 566 | goto error; |
1da177e4 | 567 | } |
1da177e4 | 568 | |
a29c33f4 | 569 | new->fsuid = new->euid = kuid; |
d84f4f99 DH |
570 | |
571 | retval = security_task_fix_setuid(new, old, LSM_SETID_ID); | |
572 | if (retval < 0) | |
573 | goto error; | |
1da177e4 | 574 | |
d84f4f99 | 575 | return commit_creds(new); |
1da177e4 | 576 | |
d84f4f99 DH |
577 | error: |
578 | abort_creds(new); | |
579 | return retval; | |
1da177e4 LT |
580 | } |
581 | ||
582 | ||
583 | /* | |
584 | * This function implements a generic ability to update ruid, euid, | |
585 | * and suid. This allows you to implement the 4.4 compatible seteuid(). | |
586 | */ | |
ae1251ab | 587 | SYSCALL_DEFINE3(setresuid, uid_t, ruid, uid_t, euid, uid_t, suid) |
1da177e4 | 588 | { |
a29c33f4 | 589 | struct user_namespace *ns = current_user_ns(); |
d84f4f99 DH |
590 | const struct cred *old; |
591 | struct cred *new; | |
1da177e4 | 592 | int retval; |
a29c33f4 EB |
593 | kuid_t kruid, keuid, ksuid; |
594 | ||
595 | kruid = make_kuid(ns, ruid); | |
596 | keuid = make_kuid(ns, euid); | |
597 | ksuid = make_kuid(ns, suid); | |
598 | ||
599 | if ((ruid != (uid_t) -1) && !uid_valid(kruid)) | |
600 | return -EINVAL; | |
601 | ||
602 | if ((euid != (uid_t) -1) && !uid_valid(keuid)) | |
603 | return -EINVAL; | |
604 | ||
605 | if ((suid != (uid_t) -1) && !uid_valid(ksuid)) | |
606 | return -EINVAL; | |
1da177e4 | 607 | |
d84f4f99 DH |
608 | new = prepare_creds(); |
609 | if (!new) | |
610 | return -ENOMEM; | |
611 | ||
d84f4f99 | 612 | old = current_cred(); |
1da177e4 | 613 | |
d84f4f99 | 614 | retval = -EPERM; |
c7b96acf | 615 | if (!ns_capable(old->user_ns, CAP_SETUID)) { |
a29c33f4 EB |
616 | if (ruid != (uid_t) -1 && !uid_eq(kruid, old->uid) && |
617 | !uid_eq(kruid, old->euid) && !uid_eq(kruid, old->suid)) | |
d84f4f99 | 618 | goto error; |
a29c33f4 EB |
619 | if (euid != (uid_t) -1 && !uid_eq(keuid, old->uid) && |
620 | !uid_eq(keuid, old->euid) && !uid_eq(keuid, old->suid)) | |
d84f4f99 | 621 | goto error; |
a29c33f4 EB |
622 | if (suid != (uid_t) -1 && !uid_eq(ksuid, old->uid) && |
623 | !uid_eq(ksuid, old->euid) && !uid_eq(ksuid, old->suid)) | |
d84f4f99 | 624 | goto error; |
1da177e4 | 625 | } |
d84f4f99 | 626 | |
1da177e4 | 627 | if (ruid != (uid_t) -1) { |
a29c33f4 EB |
628 | new->uid = kruid; |
629 | if (!uid_eq(kruid, old->uid)) { | |
54e99124 DG |
630 | retval = set_user(new); |
631 | if (retval < 0) | |
632 | goto error; | |
633 | } | |
1da177e4 | 634 | } |
d84f4f99 | 635 | if (euid != (uid_t) -1) |
a29c33f4 | 636 | new->euid = keuid; |
1da177e4 | 637 | if (suid != (uid_t) -1) |
a29c33f4 | 638 | new->suid = ksuid; |
d84f4f99 | 639 | new->fsuid = new->euid; |
1da177e4 | 640 | |
d84f4f99 DH |
641 | retval = security_task_fix_setuid(new, old, LSM_SETID_RES); |
642 | if (retval < 0) | |
643 | goto error; | |
1da177e4 | 644 | |
d84f4f99 | 645 | return commit_creds(new); |
1da177e4 | 646 | |
d84f4f99 DH |
647 | error: |
648 | abort_creds(new); | |
649 | return retval; | |
1da177e4 LT |
650 | } |
651 | ||
a29c33f4 | 652 | SYSCALL_DEFINE3(getresuid, uid_t __user *, ruidp, uid_t __user *, euidp, uid_t __user *, suidp) |
1da177e4 | 653 | { |
86a264ab | 654 | const struct cred *cred = current_cred(); |
1da177e4 | 655 | int retval; |
a29c33f4 EB |
656 | uid_t ruid, euid, suid; |
657 | ||
658 | ruid = from_kuid_munged(cred->user_ns, cred->uid); | |
659 | euid = from_kuid_munged(cred->user_ns, cred->euid); | |
660 | suid = from_kuid_munged(cred->user_ns, cred->suid); | |
1da177e4 | 661 | |
ec94fc3d | 662 | retval = put_user(ruid, ruidp); |
663 | if (!retval) { | |
664 | retval = put_user(euid, euidp); | |
665 | if (!retval) | |
666 | return put_user(suid, suidp); | |
667 | } | |
1da177e4 LT |
668 | return retval; |
669 | } | |
670 | ||
671 | /* | |
672 | * Same as above, but for rgid, egid, sgid. | |
673 | */ | |
ae1251ab | 674 | SYSCALL_DEFINE3(setresgid, gid_t, rgid, gid_t, egid, gid_t, sgid) |
1da177e4 | 675 | { |
a29c33f4 | 676 | struct user_namespace *ns = current_user_ns(); |
d84f4f99 DH |
677 | const struct cred *old; |
678 | struct cred *new; | |
1da177e4 | 679 | int retval; |
a29c33f4 EB |
680 | kgid_t krgid, kegid, ksgid; |
681 | ||
682 | krgid = make_kgid(ns, rgid); | |
683 | kegid = make_kgid(ns, egid); | |
684 | ksgid = make_kgid(ns, sgid); | |
685 | ||
686 | if ((rgid != (gid_t) -1) && !gid_valid(krgid)) | |
687 | return -EINVAL; | |
688 | if ((egid != (gid_t) -1) && !gid_valid(kegid)) | |
689 | return -EINVAL; | |
690 | if ((sgid != (gid_t) -1) && !gid_valid(ksgid)) | |
691 | return -EINVAL; | |
1da177e4 | 692 | |
d84f4f99 DH |
693 | new = prepare_creds(); |
694 | if (!new) | |
695 | return -ENOMEM; | |
696 | old = current_cred(); | |
697 | ||
d84f4f99 | 698 | retval = -EPERM; |
c7b96acf | 699 | if (!ns_capable(old->user_ns, CAP_SETGID)) { |
a29c33f4 EB |
700 | if (rgid != (gid_t) -1 && !gid_eq(krgid, old->gid) && |
701 | !gid_eq(krgid, old->egid) && !gid_eq(krgid, old->sgid)) | |
d84f4f99 | 702 | goto error; |
a29c33f4 EB |
703 | if (egid != (gid_t) -1 && !gid_eq(kegid, old->gid) && |
704 | !gid_eq(kegid, old->egid) && !gid_eq(kegid, old->sgid)) | |
d84f4f99 | 705 | goto error; |
a29c33f4 EB |
706 | if (sgid != (gid_t) -1 && !gid_eq(ksgid, old->gid) && |
707 | !gid_eq(ksgid, old->egid) && !gid_eq(ksgid, old->sgid)) | |
d84f4f99 | 708 | goto error; |
1da177e4 | 709 | } |
d84f4f99 | 710 | |
1da177e4 | 711 | if (rgid != (gid_t) -1) |
a29c33f4 | 712 | new->gid = krgid; |
d84f4f99 | 713 | if (egid != (gid_t) -1) |
a29c33f4 | 714 | new->egid = kegid; |
1da177e4 | 715 | if (sgid != (gid_t) -1) |
a29c33f4 | 716 | new->sgid = ksgid; |
d84f4f99 | 717 | new->fsgid = new->egid; |
1da177e4 | 718 | |
d84f4f99 DH |
719 | return commit_creds(new); |
720 | ||
721 | error: | |
722 | abort_creds(new); | |
723 | return retval; | |
1da177e4 LT |
724 | } |
725 | ||
a29c33f4 | 726 | SYSCALL_DEFINE3(getresgid, gid_t __user *, rgidp, gid_t __user *, egidp, gid_t __user *, sgidp) |
1da177e4 | 727 | { |
86a264ab | 728 | const struct cred *cred = current_cred(); |
1da177e4 | 729 | int retval; |
a29c33f4 EB |
730 | gid_t rgid, egid, sgid; |
731 | ||
732 | rgid = from_kgid_munged(cred->user_ns, cred->gid); | |
733 | egid = from_kgid_munged(cred->user_ns, cred->egid); | |
734 | sgid = from_kgid_munged(cred->user_ns, cred->sgid); | |
1da177e4 | 735 | |
ec94fc3d | 736 | retval = put_user(rgid, rgidp); |
737 | if (!retval) { | |
738 | retval = put_user(egid, egidp); | |
739 | if (!retval) | |
740 | retval = put_user(sgid, sgidp); | |
741 | } | |
1da177e4 LT |
742 | |
743 | return retval; | |
744 | } | |
745 | ||
746 | ||
747 | /* | |
748 | * "setfsuid()" sets the fsuid - the uid used for filesystem checks. This | |
749 | * is used for "access()" and for the NFS daemon (letting nfsd stay at | |
750 | * whatever uid it wants to). It normally shadows "euid", except when | |
751 | * explicitly set by setfsuid() or for access.. | |
752 | */ | |
ae1251ab | 753 | SYSCALL_DEFINE1(setfsuid, uid_t, uid) |
1da177e4 | 754 | { |
d84f4f99 DH |
755 | const struct cred *old; |
756 | struct cred *new; | |
757 | uid_t old_fsuid; | |
a29c33f4 EB |
758 | kuid_t kuid; |
759 | ||
760 | old = current_cred(); | |
761 | old_fsuid = from_kuid_munged(old->user_ns, old->fsuid); | |
762 | ||
763 | kuid = make_kuid(old->user_ns, uid); | |
764 | if (!uid_valid(kuid)) | |
765 | return old_fsuid; | |
1da177e4 | 766 | |
d84f4f99 DH |
767 | new = prepare_creds(); |
768 | if (!new) | |
a29c33f4 | 769 | return old_fsuid; |
1da177e4 | 770 | |
a29c33f4 EB |
771 | if (uid_eq(kuid, old->uid) || uid_eq(kuid, old->euid) || |
772 | uid_eq(kuid, old->suid) || uid_eq(kuid, old->fsuid) || | |
c7b96acf | 773 | ns_capable(old->user_ns, CAP_SETUID)) { |
a29c33f4 EB |
774 | if (!uid_eq(kuid, old->fsuid)) { |
775 | new->fsuid = kuid; | |
d84f4f99 DH |
776 | if (security_task_fix_setuid(new, old, LSM_SETID_FS) == 0) |
777 | goto change_okay; | |
1da177e4 | 778 | } |
1da177e4 LT |
779 | } |
780 | ||
d84f4f99 DH |
781 | abort_creds(new); |
782 | return old_fsuid; | |
1da177e4 | 783 | |
d84f4f99 DH |
784 | change_okay: |
785 | commit_creds(new); | |
1da177e4 LT |
786 | return old_fsuid; |
787 | } | |
788 | ||
789 | /* | |
f42df9e6 | 790 | * Samma på svenska.. |
1da177e4 | 791 | */ |
ae1251ab | 792 | SYSCALL_DEFINE1(setfsgid, gid_t, gid) |
1da177e4 | 793 | { |
d84f4f99 DH |
794 | const struct cred *old; |
795 | struct cred *new; | |
796 | gid_t old_fsgid; | |
a29c33f4 EB |
797 | kgid_t kgid; |
798 | ||
799 | old = current_cred(); | |
800 | old_fsgid = from_kgid_munged(old->user_ns, old->fsgid); | |
801 | ||
802 | kgid = make_kgid(old->user_ns, gid); | |
803 | if (!gid_valid(kgid)) | |
804 | return old_fsgid; | |
d84f4f99 DH |
805 | |
806 | new = prepare_creds(); | |
807 | if (!new) | |
a29c33f4 | 808 | return old_fsgid; |
1da177e4 | 809 | |
a29c33f4 EB |
810 | if (gid_eq(kgid, old->gid) || gid_eq(kgid, old->egid) || |
811 | gid_eq(kgid, old->sgid) || gid_eq(kgid, old->fsgid) || | |
c7b96acf | 812 | ns_capable(old->user_ns, CAP_SETGID)) { |
a29c33f4 EB |
813 | if (!gid_eq(kgid, old->fsgid)) { |
814 | new->fsgid = kgid; | |
d84f4f99 | 815 | goto change_okay; |
1da177e4 | 816 | } |
1da177e4 | 817 | } |
d84f4f99 | 818 | |
d84f4f99 DH |
819 | abort_creds(new); |
820 | return old_fsgid; | |
821 | ||
822 | change_okay: | |
823 | commit_creds(new); | |
1da177e4 LT |
824 | return old_fsgid; |
825 | } | |
2813893f | 826 | #endif /* CONFIG_MULTIUSER */ |
1da177e4 | 827 | |
4a22f166 SR |
828 | /** |
829 | * sys_getpid - return the thread group id of the current process | |
830 | * | |
831 | * Note, despite the name, this returns the tgid not the pid. The tgid and | |
832 | * the pid are identical unless CLONE_THREAD was specified on clone() in | |
833 | * which case the tgid is the same in all threads of the same group. | |
834 | * | |
835 | * This is SMP safe as current->tgid does not change. | |
836 | */ | |
837 | SYSCALL_DEFINE0(getpid) | |
838 | { | |
839 | return task_tgid_vnr(current); | |
840 | } | |
841 | ||
842 | /* Thread ID - the internal kernel "pid" */ | |
843 | SYSCALL_DEFINE0(gettid) | |
844 | { | |
845 | return task_pid_vnr(current); | |
846 | } | |
847 | ||
848 | /* | |
849 | * Accessing ->real_parent is not SMP-safe, it could | |
850 | * change from under us. However, we can use a stale | |
851 | * value of ->real_parent under rcu_read_lock(), see | |
852 | * release_task()->call_rcu(delayed_put_task_struct). | |
853 | */ | |
854 | SYSCALL_DEFINE0(getppid) | |
855 | { | |
856 | int pid; | |
857 | ||
858 | rcu_read_lock(); | |
859 | pid = task_tgid_vnr(rcu_dereference(current->real_parent)); | |
860 | rcu_read_unlock(); | |
861 | ||
862 | return pid; | |
863 | } | |
864 | ||
865 | SYSCALL_DEFINE0(getuid) | |
866 | { | |
867 | /* Only we change this so SMP safe */ | |
868 | return from_kuid_munged(current_user_ns(), current_uid()); | |
869 | } | |
870 | ||
871 | SYSCALL_DEFINE0(geteuid) | |
872 | { | |
873 | /* Only we change this so SMP safe */ | |
874 | return from_kuid_munged(current_user_ns(), current_euid()); | |
875 | } | |
876 | ||
877 | SYSCALL_DEFINE0(getgid) | |
878 | { | |
879 | /* Only we change this so SMP safe */ | |
880 | return from_kgid_munged(current_user_ns(), current_gid()); | |
881 | } | |
882 | ||
883 | SYSCALL_DEFINE0(getegid) | |
884 | { | |
885 | /* Only we change this so SMP safe */ | |
886 | return from_kgid_munged(current_user_ns(), current_egid()); | |
887 | } | |
888 | ||
f06febc9 FM |
889 | void do_sys_times(struct tms *tms) |
890 | { | |
5613fda9 | 891 | u64 tgutime, tgstime, cutime, cstime; |
f06febc9 | 892 | |
e80d0a1a | 893 | thread_group_cputime_adjusted(current, &tgutime, &tgstime); |
f06febc9 FM |
894 | cutime = current->signal->cutime; |
895 | cstime = current->signal->cstime; | |
5613fda9 FW |
896 | tms->tms_utime = nsec_to_clock_t(tgutime); |
897 | tms->tms_stime = nsec_to_clock_t(tgstime); | |
898 | tms->tms_cutime = nsec_to_clock_t(cutime); | |
899 | tms->tms_cstime = nsec_to_clock_t(cstime); | |
f06febc9 FM |
900 | } |
901 | ||
58fd3aa2 | 902 | SYSCALL_DEFINE1(times, struct tms __user *, tbuf) |
1da177e4 | 903 | { |
1da177e4 LT |
904 | if (tbuf) { |
905 | struct tms tmp; | |
f06febc9 FM |
906 | |
907 | do_sys_times(&tmp); | |
1da177e4 LT |
908 | if (copy_to_user(tbuf, &tmp, sizeof(struct tms))) |
909 | return -EFAULT; | |
910 | } | |
e3d5a27d | 911 | force_successful_syscall_return(); |
1da177e4 LT |
912 | return (long) jiffies_64_to_clock_t(get_jiffies_64()); |
913 | } | |
914 | ||
915 | /* | |
916 | * This needs some heavy checking ... | |
917 | * I just haven't the stomach for it. I also don't fully | |
918 | * understand sessions/pgrp etc. Let somebody who does explain it. | |
919 | * | |
920 | * OK, I think I have the protection semantics right.... this is really | |
921 | * only important on a multi-user system anyway, to make sure one user | |
922 | * can't send a signal to a process owned by another. -TYT, 12/12/91 | |
923 | * | |
98611e4e | 924 | * !PF_FORKNOEXEC check to conform completely to POSIX. |
1da177e4 | 925 | */ |
b290ebe2 | 926 | SYSCALL_DEFINE2(setpgid, pid_t, pid, pid_t, pgid) |
1da177e4 LT |
927 | { |
928 | struct task_struct *p; | |
ee0acf90 | 929 | struct task_struct *group_leader = current->group_leader; |
4e021306 ON |
930 | struct pid *pgrp; |
931 | int err; | |
1da177e4 LT |
932 | |
933 | if (!pid) | |
b488893a | 934 | pid = task_pid_vnr(group_leader); |
1da177e4 LT |
935 | if (!pgid) |
936 | pgid = pid; | |
937 | if (pgid < 0) | |
938 | return -EINVAL; | |
950eaaca | 939 | rcu_read_lock(); |
1da177e4 LT |
940 | |
941 | /* From this point forward we keep holding onto the tasklist lock | |
942 | * so that our parent does not change from under us. -DaveM | |
943 | */ | |
944 | write_lock_irq(&tasklist_lock); | |
945 | ||
946 | err = -ESRCH; | |
4e021306 | 947 | p = find_task_by_vpid(pid); |
1da177e4 LT |
948 | if (!p) |
949 | goto out; | |
950 | ||
951 | err = -EINVAL; | |
952 | if (!thread_group_leader(p)) | |
953 | goto out; | |
954 | ||
4e021306 | 955 | if (same_thread_group(p->real_parent, group_leader)) { |
1da177e4 | 956 | err = -EPERM; |
41487c65 | 957 | if (task_session(p) != task_session(group_leader)) |
1da177e4 LT |
958 | goto out; |
959 | err = -EACCES; | |
98611e4e | 960 | if (!(p->flags & PF_FORKNOEXEC)) |
1da177e4 LT |
961 | goto out; |
962 | } else { | |
963 | err = -ESRCH; | |
ee0acf90 | 964 | if (p != group_leader) |
1da177e4 LT |
965 | goto out; |
966 | } | |
967 | ||
968 | err = -EPERM; | |
969 | if (p->signal->leader) | |
970 | goto out; | |
971 | ||
4e021306 | 972 | pgrp = task_pid(p); |
1da177e4 | 973 | if (pgid != pid) { |
b488893a | 974 | struct task_struct *g; |
1da177e4 | 975 | |
4e021306 ON |
976 | pgrp = find_vpid(pgid); |
977 | g = pid_task(pgrp, PIDTYPE_PGID); | |
41487c65 | 978 | if (!g || task_session(g) != task_session(group_leader)) |
f020bc46 | 979 | goto out; |
1da177e4 LT |
980 | } |
981 | ||
1da177e4 LT |
982 | err = security_task_setpgid(p, pgid); |
983 | if (err) | |
984 | goto out; | |
985 | ||
1b0f7ffd | 986 | if (task_pgrp(p) != pgrp) |
83beaf3c | 987 | change_pid(p, PIDTYPE_PGID, pgrp); |
1da177e4 LT |
988 | |
989 | err = 0; | |
990 | out: | |
991 | /* All paths lead to here, thus we are safe. -DaveM */ | |
992 | write_unlock_irq(&tasklist_lock); | |
950eaaca | 993 | rcu_read_unlock(); |
1da177e4 LT |
994 | return err; |
995 | } | |
996 | ||
dbf040d9 | 997 | SYSCALL_DEFINE1(getpgid, pid_t, pid) |
1da177e4 | 998 | { |
12a3de0a ON |
999 | struct task_struct *p; |
1000 | struct pid *grp; | |
1001 | int retval; | |
1002 | ||
1003 | rcu_read_lock(); | |
756184b7 | 1004 | if (!pid) |
12a3de0a | 1005 | grp = task_pgrp(current); |
756184b7 | 1006 | else { |
1da177e4 | 1007 | retval = -ESRCH; |
12a3de0a ON |
1008 | p = find_task_by_vpid(pid); |
1009 | if (!p) | |
1010 | goto out; | |
1011 | grp = task_pgrp(p); | |
1012 | if (!grp) | |
1013 | goto out; | |
1014 | ||
1015 | retval = security_task_getpgid(p); | |
1016 | if (retval) | |
1017 | goto out; | |
1da177e4 | 1018 | } |
12a3de0a ON |
1019 | retval = pid_vnr(grp); |
1020 | out: | |
1021 | rcu_read_unlock(); | |
1022 | return retval; | |
1da177e4 LT |
1023 | } |
1024 | ||
1025 | #ifdef __ARCH_WANT_SYS_GETPGRP | |
1026 | ||
dbf040d9 | 1027 | SYSCALL_DEFINE0(getpgrp) |
1da177e4 | 1028 | { |
12a3de0a | 1029 | return sys_getpgid(0); |
1da177e4 LT |
1030 | } |
1031 | ||
1032 | #endif | |
1033 | ||
dbf040d9 | 1034 | SYSCALL_DEFINE1(getsid, pid_t, pid) |
1da177e4 | 1035 | { |
1dd768c0 ON |
1036 | struct task_struct *p; |
1037 | struct pid *sid; | |
1038 | int retval; | |
1039 | ||
1040 | rcu_read_lock(); | |
756184b7 | 1041 | if (!pid) |
1dd768c0 | 1042 | sid = task_session(current); |
756184b7 | 1043 | else { |
1da177e4 | 1044 | retval = -ESRCH; |
1dd768c0 ON |
1045 | p = find_task_by_vpid(pid); |
1046 | if (!p) | |
1047 | goto out; | |
1048 | sid = task_session(p); | |
1049 | if (!sid) | |
1050 | goto out; | |
1051 | ||
1052 | retval = security_task_getsid(p); | |
1053 | if (retval) | |
1054 | goto out; | |
1da177e4 | 1055 | } |
1dd768c0 ON |
1056 | retval = pid_vnr(sid); |
1057 | out: | |
1058 | rcu_read_unlock(); | |
1059 | return retval; | |
1da177e4 LT |
1060 | } |
1061 | ||
81dabb46 ON |
1062 | static void set_special_pids(struct pid *pid) |
1063 | { | |
1064 | struct task_struct *curr = current->group_leader; | |
1065 | ||
1066 | if (task_session(curr) != pid) | |
1067 | change_pid(curr, PIDTYPE_SID, pid); | |
1068 | ||
1069 | if (task_pgrp(curr) != pid) | |
1070 | change_pid(curr, PIDTYPE_PGID, pid); | |
1071 | } | |
1072 | ||
b290ebe2 | 1073 | SYSCALL_DEFINE0(setsid) |
1da177e4 | 1074 | { |
e19f247a | 1075 | struct task_struct *group_leader = current->group_leader; |
e4cc0a9c ON |
1076 | struct pid *sid = task_pid(group_leader); |
1077 | pid_t session = pid_vnr(sid); | |
1da177e4 LT |
1078 | int err = -EPERM; |
1079 | ||
1da177e4 | 1080 | write_lock_irq(&tasklist_lock); |
390e2ff0 EB |
1081 | /* Fail if I am already a session leader */ |
1082 | if (group_leader->signal->leader) | |
1083 | goto out; | |
1084 | ||
430c6231 ON |
1085 | /* Fail if a process group id already exists that equals the |
1086 | * proposed session id. | |
390e2ff0 | 1087 | */ |
6806aac6 | 1088 | if (pid_task(sid, PIDTYPE_PGID)) |
1da177e4 LT |
1089 | goto out; |
1090 | ||
e19f247a | 1091 | group_leader->signal->leader = 1; |
81dabb46 | 1092 | set_special_pids(sid); |
24ec839c | 1093 | |
9c9f4ded | 1094 | proc_clear_tty(group_leader); |
24ec839c | 1095 | |
e4cc0a9c | 1096 | err = session; |
1da177e4 LT |
1097 | out: |
1098 | write_unlock_irq(&tasklist_lock); | |
5091faa4 | 1099 | if (err > 0) { |
0d0df599 | 1100 | proc_sid_connector(group_leader); |
5091faa4 MG |
1101 | sched_autogroup_create_attach(group_leader); |
1102 | } | |
1da177e4 LT |
1103 | return err; |
1104 | } | |
1105 | ||
1da177e4 LT |
1106 | DECLARE_RWSEM(uts_sem); |
1107 | ||
e28cbf22 CH |
1108 | #ifdef COMPAT_UTS_MACHINE |
1109 | #define override_architecture(name) \ | |
46da2766 | 1110 | (personality(current->personality) == PER_LINUX32 && \ |
e28cbf22 CH |
1111 | copy_to_user(name->machine, COMPAT_UTS_MACHINE, \ |
1112 | sizeof(COMPAT_UTS_MACHINE))) | |
1113 | #else | |
1114 | #define override_architecture(name) 0 | |
1115 | #endif | |
1116 | ||
be27425d AK |
1117 | /* |
1118 | * Work around broken programs that cannot handle "Linux 3.0". | |
1119 | * Instead we map 3.x to 2.6.40+x, so e.g. 3.0 would be 2.6.40 | |
39afb5ee | 1120 | * And we map 4.x to 2.6.60+x, so 4.0 would be 2.6.60. |
be27425d | 1121 | */ |
2702b152 | 1122 | static int override_release(char __user *release, size_t len) |
be27425d AK |
1123 | { |
1124 | int ret = 0; | |
be27425d AK |
1125 | |
1126 | if (current->personality & UNAME26) { | |
2702b152 KC |
1127 | const char *rest = UTS_RELEASE; |
1128 | char buf[65] = { 0 }; | |
be27425d AK |
1129 | int ndots = 0; |
1130 | unsigned v; | |
2702b152 | 1131 | size_t copy; |
be27425d AK |
1132 | |
1133 | while (*rest) { | |
1134 | if (*rest == '.' && ++ndots >= 3) | |
1135 | break; | |
1136 | if (!isdigit(*rest) && *rest != '.') | |
1137 | break; | |
1138 | rest++; | |
1139 | } | |
39afb5ee | 1140 | v = ((LINUX_VERSION_CODE >> 8) & 0xff) + 60; |
31fd84b9 | 1141 | copy = clamp_t(size_t, len, 1, sizeof(buf)); |
2702b152 KC |
1142 | copy = scnprintf(buf, copy, "2.6.%u%s", v, rest); |
1143 | ret = copy_to_user(release, buf, copy + 1); | |
be27425d AK |
1144 | } |
1145 | return ret; | |
1146 | } | |
1147 | ||
e48fbb69 | 1148 | SYSCALL_DEFINE1(newuname, struct new_utsname __user *, name) |
1da177e4 LT |
1149 | { |
1150 | int errno = 0; | |
1151 | ||
1152 | down_read(&uts_sem); | |
e9ff3990 | 1153 | if (copy_to_user(name, utsname(), sizeof *name)) |
1da177e4 LT |
1154 | errno = -EFAULT; |
1155 | up_read(&uts_sem); | |
e28cbf22 | 1156 | |
be27425d AK |
1157 | if (!errno && override_release(name->release, sizeof(name->release))) |
1158 | errno = -EFAULT; | |
e28cbf22 CH |
1159 | if (!errno && override_architecture(name)) |
1160 | errno = -EFAULT; | |
1da177e4 LT |
1161 | return errno; |
1162 | } | |
1163 | ||
5cacdb4a CH |
1164 | #ifdef __ARCH_WANT_SYS_OLD_UNAME |
1165 | /* | |
1166 | * Old cruft | |
1167 | */ | |
1168 | SYSCALL_DEFINE1(uname, struct old_utsname __user *, name) | |
1169 | { | |
1170 | int error = 0; | |
1171 | ||
1172 | if (!name) | |
1173 | return -EFAULT; | |
1174 | ||
1175 | down_read(&uts_sem); | |
1176 | if (copy_to_user(name, utsname(), sizeof(*name))) | |
1177 | error = -EFAULT; | |
1178 | up_read(&uts_sem); | |
1179 | ||
be27425d AK |
1180 | if (!error && override_release(name->release, sizeof(name->release))) |
1181 | error = -EFAULT; | |
5cacdb4a CH |
1182 | if (!error && override_architecture(name)) |
1183 | error = -EFAULT; | |
1184 | return error; | |
1185 | } | |
1186 | ||
1187 | SYSCALL_DEFINE1(olduname, struct oldold_utsname __user *, name) | |
1188 | { | |
1189 | int error; | |
1190 | ||
1191 | if (!name) | |
1192 | return -EFAULT; | |
1193 | if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname))) | |
1194 | return -EFAULT; | |
1195 | ||
1196 | down_read(&uts_sem); | |
1197 | error = __copy_to_user(&name->sysname, &utsname()->sysname, | |
1198 | __OLD_UTS_LEN); | |
1199 | error |= __put_user(0, name->sysname + __OLD_UTS_LEN); | |
1200 | error |= __copy_to_user(&name->nodename, &utsname()->nodename, | |
1201 | __OLD_UTS_LEN); | |
1202 | error |= __put_user(0, name->nodename + __OLD_UTS_LEN); | |
1203 | error |= __copy_to_user(&name->release, &utsname()->release, | |
1204 | __OLD_UTS_LEN); | |
1205 | error |= __put_user(0, name->release + __OLD_UTS_LEN); | |
1206 | error |= __copy_to_user(&name->version, &utsname()->version, | |
1207 | __OLD_UTS_LEN); | |
1208 | error |= __put_user(0, name->version + __OLD_UTS_LEN); | |
1209 | error |= __copy_to_user(&name->machine, &utsname()->machine, | |
1210 | __OLD_UTS_LEN); | |
1211 | error |= __put_user(0, name->machine + __OLD_UTS_LEN); | |
1212 | up_read(&uts_sem); | |
1213 | ||
1214 | if (!error && override_architecture(name)) | |
1215 | error = -EFAULT; | |
be27425d AK |
1216 | if (!error && override_release(name->release, sizeof(name->release))) |
1217 | error = -EFAULT; | |
5cacdb4a CH |
1218 | return error ? -EFAULT : 0; |
1219 | } | |
1220 | #endif | |
1221 | ||
5a8a82b1 | 1222 | SYSCALL_DEFINE2(sethostname, char __user *, name, int, len) |
1da177e4 LT |
1223 | { |
1224 | int errno; | |
1225 | char tmp[__NEW_UTS_LEN]; | |
1226 | ||
bb96a6f5 | 1227 | if (!ns_capable(current->nsproxy->uts_ns->user_ns, CAP_SYS_ADMIN)) |
1da177e4 | 1228 | return -EPERM; |
fc832ad3 | 1229 | |
1da177e4 LT |
1230 | if (len < 0 || len > __NEW_UTS_LEN) |
1231 | return -EINVAL; | |
1232 | down_write(&uts_sem); | |
1233 | errno = -EFAULT; | |
1234 | if (!copy_from_user(tmp, name, len)) { | |
9679e4dd AM |
1235 | struct new_utsname *u = utsname(); |
1236 | ||
1237 | memcpy(u->nodename, tmp, len); | |
1238 | memset(u->nodename + len, 0, sizeof(u->nodename) - len); | |
1da177e4 | 1239 | errno = 0; |
499eea6b | 1240 | uts_proc_notify(UTS_PROC_HOSTNAME); |
1da177e4 LT |
1241 | } |
1242 | up_write(&uts_sem); | |
1243 | return errno; | |
1244 | } | |
1245 | ||
1246 | #ifdef __ARCH_WANT_SYS_GETHOSTNAME | |
1247 | ||
5a8a82b1 | 1248 | SYSCALL_DEFINE2(gethostname, char __user *, name, int, len) |
1da177e4 LT |
1249 | { |
1250 | int i, errno; | |
9679e4dd | 1251 | struct new_utsname *u; |
1da177e4 LT |
1252 | |
1253 | if (len < 0) | |
1254 | return -EINVAL; | |
1255 | down_read(&uts_sem); | |
9679e4dd AM |
1256 | u = utsname(); |
1257 | i = 1 + strlen(u->nodename); | |
1da177e4 LT |
1258 | if (i > len) |
1259 | i = len; | |
1260 | errno = 0; | |
9679e4dd | 1261 | if (copy_to_user(name, u->nodename, i)) |
1da177e4 LT |
1262 | errno = -EFAULT; |
1263 | up_read(&uts_sem); | |
1264 | return errno; | |
1265 | } | |
1266 | ||
1267 | #endif | |
1268 | ||
1269 | /* | |
1270 | * Only setdomainname; getdomainname can be implemented by calling | |
1271 | * uname() | |
1272 | */ | |
5a8a82b1 | 1273 | SYSCALL_DEFINE2(setdomainname, char __user *, name, int, len) |
1da177e4 LT |
1274 | { |
1275 | int errno; | |
1276 | char tmp[__NEW_UTS_LEN]; | |
1277 | ||
fc832ad3 | 1278 | if (!ns_capable(current->nsproxy->uts_ns->user_ns, CAP_SYS_ADMIN)) |
1da177e4 LT |
1279 | return -EPERM; |
1280 | if (len < 0 || len > __NEW_UTS_LEN) | |
1281 | return -EINVAL; | |
1282 | ||
1283 | down_write(&uts_sem); | |
1284 | errno = -EFAULT; | |
1285 | if (!copy_from_user(tmp, name, len)) { | |
9679e4dd AM |
1286 | struct new_utsname *u = utsname(); |
1287 | ||
1288 | memcpy(u->domainname, tmp, len); | |
1289 | memset(u->domainname + len, 0, sizeof(u->domainname) - len); | |
1da177e4 | 1290 | errno = 0; |
499eea6b | 1291 | uts_proc_notify(UTS_PROC_DOMAINNAME); |
1da177e4 LT |
1292 | } |
1293 | up_write(&uts_sem); | |
1294 | return errno; | |
1295 | } | |
1296 | ||
e48fbb69 | 1297 | SYSCALL_DEFINE2(getrlimit, unsigned int, resource, struct rlimit __user *, rlim) |
1da177e4 | 1298 | { |
b9518345 JS |
1299 | struct rlimit value; |
1300 | int ret; | |
1301 | ||
1302 | ret = do_prlimit(current, resource, NULL, &value); | |
1303 | if (!ret) | |
1304 | ret = copy_to_user(rlim, &value, sizeof(*rlim)) ? -EFAULT : 0; | |
1305 | ||
1306 | return ret; | |
1da177e4 LT |
1307 | } |
1308 | ||
1309 | #ifdef __ARCH_WANT_SYS_OLD_GETRLIMIT | |
1310 | ||
1311 | /* | |
1312 | * Back compatibility for getrlimit. Needed for some apps. | |
1313 | */ | |
e48fbb69 HC |
1314 | SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource, |
1315 | struct rlimit __user *, rlim) | |
1da177e4 LT |
1316 | { |
1317 | struct rlimit x; | |
1318 | if (resource >= RLIM_NLIMITS) | |
1319 | return -EINVAL; | |
1320 | ||
1321 | task_lock(current->group_leader); | |
1322 | x = current->signal->rlim[resource]; | |
1323 | task_unlock(current->group_leader); | |
756184b7 | 1324 | if (x.rlim_cur > 0x7FFFFFFF) |
1da177e4 | 1325 | x.rlim_cur = 0x7FFFFFFF; |
756184b7 | 1326 | if (x.rlim_max > 0x7FFFFFFF) |
1da177e4 | 1327 | x.rlim_max = 0x7FFFFFFF; |
ec94fc3d | 1328 | return copy_to_user(rlim, &x, sizeof(x)) ? -EFAULT : 0; |
1da177e4 LT |
1329 | } |
1330 | ||
1331 | #endif | |
1332 | ||
c022a0ac JS |
1333 | static inline bool rlim64_is_infinity(__u64 rlim64) |
1334 | { | |
1335 | #if BITS_PER_LONG < 64 | |
1336 | return rlim64 >= ULONG_MAX; | |
1337 | #else | |
1338 | return rlim64 == RLIM64_INFINITY; | |
1339 | #endif | |
1340 | } | |
1341 | ||
1342 | static void rlim_to_rlim64(const struct rlimit *rlim, struct rlimit64 *rlim64) | |
1343 | { | |
1344 | if (rlim->rlim_cur == RLIM_INFINITY) | |
1345 | rlim64->rlim_cur = RLIM64_INFINITY; | |
1346 | else | |
1347 | rlim64->rlim_cur = rlim->rlim_cur; | |
1348 | if (rlim->rlim_max == RLIM_INFINITY) | |
1349 | rlim64->rlim_max = RLIM64_INFINITY; | |
1350 | else | |
1351 | rlim64->rlim_max = rlim->rlim_max; | |
1352 | } | |
1353 | ||
1354 | static void rlim64_to_rlim(const struct rlimit64 *rlim64, struct rlimit *rlim) | |
1355 | { | |
1356 | if (rlim64_is_infinity(rlim64->rlim_cur)) | |
1357 | rlim->rlim_cur = RLIM_INFINITY; | |
1358 | else | |
1359 | rlim->rlim_cur = (unsigned long)rlim64->rlim_cur; | |
1360 | if (rlim64_is_infinity(rlim64->rlim_max)) | |
1361 | rlim->rlim_max = RLIM_INFINITY; | |
1362 | else | |
1363 | rlim->rlim_max = (unsigned long)rlim64->rlim_max; | |
1364 | } | |
1365 | ||
1c1e618d | 1366 | /* make sure you are allowed to change @tsk limits before calling this */ |
5b41535a JS |
1367 | int do_prlimit(struct task_struct *tsk, unsigned int resource, |
1368 | struct rlimit *new_rlim, struct rlimit *old_rlim) | |
1da177e4 | 1369 | { |
5b41535a | 1370 | struct rlimit *rlim; |
86f162f4 | 1371 | int retval = 0; |
1da177e4 LT |
1372 | |
1373 | if (resource >= RLIM_NLIMITS) | |
1374 | return -EINVAL; | |
5b41535a JS |
1375 | if (new_rlim) { |
1376 | if (new_rlim->rlim_cur > new_rlim->rlim_max) | |
1377 | return -EINVAL; | |
1378 | if (resource == RLIMIT_NOFILE && | |
1379 | new_rlim->rlim_max > sysctl_nr_open) | |
1380 | return -EPERM; | |
1381 | } | |
1da177e4 | 1382 | |
1c1e618d JS |
1383 | /* protect tsk->signal and tsk->sighand from disappearing */ |
1384 | read_lock(&tasklist_lock); | |
1385 | if (!tsk->sighand) { | |
1386 | retval = -ESRCH; | |
1387 | goto out; | |
1388 | } | |
1389 | ||
5b41535a | 1390 | rlim = tsk->signal->rlim + resource; |
86f162f4 | 1391 | task_lock(tsk->group_leader); |
5b41535a | 1392 | if (new_rlim) { |
fc832ad3 SH |
1393 | /* Keep the capable check against init_user_ns until |
1394 | cgroups can contain all limits */ | |
5b41535a JS |
1395 | if (new_rlim->rlim_max > rlim->rlim_max && |
1396 | !capable(CAP_SYS_RESOURCE)) | |
1397 | retval = -EPERM; | |
1398 | if (!retval) | |
1399 | retval = security_task_setrlimit(tsk->group_leader, | |
1400 | resource, new_rlim); | |
1401 | if (resource == RLIMIT_CPU && new_rlim->rlim_cur == 0) { | |
1402 | /* | |
1403 | * The caller is asking for an immediate RLIMIT_CPU | |
1404 | * expiry. But we use the zero value to mean "it was | |
1405 | * never set". So let's cheat and make it one second | |
1406 | * instead | |
1407 | */ | |
1408 | new_rlim->rlim_cur = 1; | |
1409 | } | |
1410 | } | |
1411 | if (!retval) { | |
1412 | if (old_rlim) | |
1413 | *old_rlim = *rlim; | |
1414 | if (new_rlim) | |
1415 | *rlim = *new_rlim; | |
9926e4c7 | 1416 | } |
7855c35d | 1417 | task_unlock(tsk->group_leader); |
1da177e4 | 1418 | |
d3561f78 AM |
1419 | /* |
1420 | * RLIMIT_CPU handling. Note that the kernel fails to return an error | |
1421 | * code if it rejected the user's attempt to set RLIMIT_CPU. This is a | |
1422 | * very long-standing error, and fixing it now risks breakage of | |
1423 | * applications, so we live with it | |
1424 | */ | |
5b41535a | 1425 | if (!retval && new_rlim && resource == RLIMIT_CPU && |
baa73d9e NP |
1426 | new_rlim->rlim_cur != RLIM_INFINITY && |
1427 | IS_ENABLED(CONFIG_POSIX_TIMERS)) | |
5b41535a | 1428 | update_rlimit_cpu(tsk, new_rlim->rlim_cur); |
ec9e16ba | 1429 | out: |
1c1e618d | 1430 | read_unlock(&tasklist_lock); |
2fb9d268 | 1431 | return retval; |
1da177e4 LT |
1432 | } |
1433 | ||
c022a0ac JS |
1434 | /* rcu lock must be held */ |
1435 | static int check_prlimit_permission(struct task_struct *task) | |
1436 | { | |
1437 | const struct cred *cred = current_cred(), *tcred; | |
1438 | ||
fc832ad3 SH |
1439 | if (current == task) |
1440 | return 0; | |
c022a0ac | 1441 | |
fc832ad3 | 1442 | tcred = __task_cred(task); |
5af66203 EB |
1443 | if (uid_eq(cred->uid, tcred->euid) && |
1444 | uid_eq(cred->uid, tcred->suid) && | |
1445 | uid_eq(cred->uid, tcred->uid) && | |
1446 | gid_eq(cred->gid, tcred->egid) && | |
1447 | gid_eq(cred->gid, tcred->sgid) && | |
1448 | gid_eq(cred->gid, tcred->gid)) | |
fc832ad3 | 1449 | return 0; |
c4a4d603 | 1450 | if (ns_capable(tcred->user_ns, CAP_SYS_RESOURCE)) |
fc832ad3 SH |
1451 | return 0; |
1452 | ||
1453 | return -EPERM; | |
c022a0ac JS |
1454 | } |
1455 | ||
1456 | SYSCALL_DEFINE4(prlimit64, pid_t, pid, unsigned int, resource, | |
1457 | const struct rlimit64 __user *, new_rlim, | |
1458 | struct rlimit64 __user *, old_rlim) | |
1459 | { | |
1460 | struct rlimit64 old64, new64; | |
1461 | struct rlimit old, new; | |
1462 | struct task_struct *tsk; | |
1463 | int ret; | |
1464 | ||
1465 | if (new_rlim) { | |
1466 | if (copy_from_user(&new64, new_rlim, sizeof(new64))) | |
1467 | return -EFAULT; | |
1468 | rlim64_to_rlim(&new64, &new); | |
1469 | } | |
1470 | ||
1471 | rcu_read_lock(); | |
1472 | tsk = pid ? find_task_by_vpid(pid) : current; | |
1473 | if (!tsk) { | |
1474 | rcu_read_unlock(); | |
1475 | return -ESRCH; | |
1476 | } | |
1477 | ret = check_prlimit_permission(tsk); | |
1478 | if (ret) { | |
1479 | rcu_read_unlock(); | |
1480 | return ret; | |
1481 | } | |
1482 | get_task_struct(tsk); | |
1483 | rcu_read_unlock(); | |
1484 | ||
1485 | ret = do_prlimit(tsk, resource, new_rlim ? &new : NULL, | |
1486 | old_rlim ? &old : NULL); | |
1487 | ||
1488 | if (!ret && old_rlim) { | |
1489 | rlim_to_rlim64(&old, &old64); | |
1490 | if (copy_to_user(old_rlim, &old64, sizeof(old64))) | |
1491 | ret = -EFAULT; | |
1492 | } | |
1493 | ||
1494 | put_task_struct(tsk); | |
1495 | return ret; | |
1496 | } | |
1497 | ||
7855c35d JS |
1498 | SYSCALL_DEFINE2(setrlimit, unsigned int, resource, struct rlimit __user *, rlim) |
1499 | { | |
1500 | struct rlimit new_rlim; | |
1501 | ||
1502 | if (copy_from_user(&new_rlim, rlim, sizeof(*rlim))) | |
1503 | return -EFAULT; | |
5b41535a | 1504 | return do_prlimit(current, resource, &new_rlim, NULL); |
7855c35d JS |
1505 | } |
1506 | ||
1da177e4 LT |
1507 | /* |
1508 | * It would make sense to put struct rusage in the task_struct, | |
1509 | * except that would make the task_struct be *really big*. After | |
1510 | * task_struct gets moved into malloc'ed memory, it would | |
1511 | * make sense to do this. It will make moving the rest of the information | |
1512 | * a lot simpler! (Which we're not doing right now because we're not | |
1513 | * measuring them yet). | |
1514 | * | |
1da177e4 LT |
1515 | * When sampling multiple threads for RUSAGE_SELF, under SMP we might have |
1516 | * races with threads incrementing their own counters. But since word | |
1517 | * reads are atomic, we either get new values or old values and we don't | |
1518 | * care which for the sums. We always take the siglock to protect reading | |
1519 | * the c* fields from p->signal from races with exit.c updating those | |
1520 | * fields when reaping, so a sample either gets all the additions of a | |
1521 | * given child after it's reaped, or none so this sample is before reaping. | |
2dd0ebcd | 1522 | * |
de047c1b RT |
1523 | * Locking: |
1524 | * We need to take the siglock for CHILDEREN, SELF and BOTH | |
1525 | * for the cases current multithreaded, non-current single threaded | |
1526 | * non-current multithreaded. Thread traversal is now safe with | |
1527 | * the siglock held. | |
1528 | * Strictly speaking, we donot need to take the siglock if we are current and | |
1529 | * single threaded, as no one else can take our signal_struct away, no one | |
1530 | * else can reap the children to update signal->c* counters, and no one else | |
1531 | * can race with the signal-> fields. If we do not take any lock, the | |
1532 | * signal-> fields could be read out of order while another thread was just | |
1533 | * exiting. So we should place a read memory barrier when we avoid the lock. | |
1534 | * On the writer side, write memory barrier is implied in __exit_signal | |
1535 | * as __exit_signal releases the siglock spinlock after updating the signal-> | |
1536 | * fields. But we don't do this yet to keep things simple. | |
2dd0ebcd | 1537 | * |
1da177e4 LT |
1538 | */ |
1539 | ||
f06febc9 | 1540 | static void accumulate_thread_rusage(struct task_struct *t, struct rusage *r) |
679c9cd4 | 1541 | { |
679c9cd4 SK |
1542 | r->ru_nvcsw += t->nvcsw; |
1543 | r->ru_nivcsw += t->nivcsw; | |
1544 | r->ru_minflt += t->min_flt; | |
1545 | r->ru_majflt += t->maj_flt; | |
1546 | r->ru_inblock += task_io_get_inblock(t); | |
1547 | r->ru_oublock += task_io_get_oublock(t); | |
1548 | } | |
1549 | ||
1da177e4 LT |
1550 | static void k_getrusage(struct task_struct *p, int who, struct rusage *r) |
1551 | { | |
1552 | struct task_struct *t; | |
1553 | unsigned long flags; | |
5613fda9 | 1554 | u64 tgutime, tgstime, utime, stime; |
1f10206c | 1555 | unsigned long maxrss = 0; |
1da177e4 | 1556 | |
ec94fc3d | 1557 | memset((char *)r, 0, sizeof (*r)); |
64861634 | 1558 | utime = stime = 0; |
1da177e4 | 1559 | |
679c9cd4 | 1560 | if (who == RUSAGE_THREAD) { |
e80d0a1a | 1561 | task_cputime_adjusted(current, &utime, &stime); |
f06febc9 | 1562 | accumulate_thread_rusage(p, r); |
1f10206c | 1563 | maxrss = p->signal->maxrss; |
679c9cd4 SK |
1564 | goto out; |
1565 | } | |
1566 | ||
d6cf723a | 1567 | if (!lock_task_sighand(p, &flags)) |
de047c1b | 1568 | return; |
0f59cc4a | 1569 | |
1da177e4 | 1570 | switch (who) { |
ec94fc3d | 1571 | case RUSAGE_BOTH: |
1572 | case RUSAGE_CHILDREN: | |
1573 | utime = p->signal->cutime; | |
1574 | stime = p->signal->cstime; | |
1575 | r->ru_nvcsw = p->signal->cnvcsw; | |
1576 | r->ru_nivcsw = p->signal->cnivcsw; | |
1577 | r->ru_minflt = p->signal->cmin_flt; | |
1578 | r->ru_majflt = p->signal->cmaj_flt; | |
1579 | r->ru_inblock = p->signal->cinblock; | |
1580 | r->ru_oublock = p->signal->coublock; | |
1581 | maxrss = p->signal->cmaxrss; | |
1582 | ||
1583 | if (who == RUSAGE_CHILDREN) | |
1da177e4 | 1584 | break; |
0f59cc4a | 1585 | |
ec94fc3d | 1586 | case RUSAGE_SELF: |
1587 | thread_group_cputime_adjusted(p, &tgutime, &tgstime); | |
1588 | utime += tgutime; | |
1589 | stime += tgstime; | |
1590 | r->ru_nvcsw += p->signal->nvcsw; | |
1591 | r->ru_nivcsw += p->signal->nivcsw; | |
1592 | r->ru_minflt += p->signal->min_flt; | |
1593 | r->ru_majflt += p->signal->maj_flt; | |
1594 | r->ru_inblock += p->signal->inblock; | |
1595 | r->ru_oublock += p->signal->oublock; | |
1596 | if (maxrss < p->signal->maxrss) | |
1597 | maxrss = p->signal->maxrss; | |
1598 | t = p; | |
1599 | do { | |
1600 | accumulate_thread_rusage(t, r); | |
1601 | } while_each_thread(p, t); | |
1602 | break; | |
1603 | ||
1604 | default: | |
1605 | BUG(); | |
1da177e4 | 1606 | } |
de047c1b | 1607 | unlock_task_sighand(p, &flags); |
de047c1b | 1608 | |
679c9cd4 | 1609 | out: |
5613fda9 FW |
1610 | r->ru_utime = ns_to_timeval(utime); |
1611 | r->ru_stime = ns_to_timeval(stime); | |
1f10206c JP |
1612 | |
1613 | if (who != RUSAGE_CHILDREN) { | |
1614 | struct mm_struct *mm = get_task_mm(p); | |
ec94fc3d | 1615 | |
1f10206c JP |
1616 | if (mm) { |
1617 | setmax_mm_hiwater_rss(&maxrss, mm); | |
1618 | mmput(mm); | |
1619 | } | |
1620 | } | |
1621 | r->ru_maxrss = maxrss * (PAGE_SIZE / 1024); /* convert pages to KBs */ | |
1da177e4 LT |
1622 | } |
1623 | ||
1624 | int getrusage(struct task_struct *p, int who, struct rusage __user *ru) | |
1625 | { | |
1626 | struct rusage r; | |
ec94fc3d | 1627 | |
1da177e4 | 1628 | k_getrusage(p, who, &r); |
1da177e4 LT |
1629 | return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0; |
1630 | } | |
1631 | ||
e48fbb69 | 1632 | SYSCALL_DEFINE2(getrusage, int, who, struct rusage __user *, ru) |
1da177e4 | 1633 | { |
679c9cd4 SK |
1634 | if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN && |
1635 | who != RUSAGE_THREAD) | |
1da177e4 LT |
1636 | return -EINVAL; |
1637 | return getrusage(current, who, ru); | |
1638 | } | |
1639 | ||
8d2d5c4a AV |
1640 | #ifdef CONFIG_COMPAT |
1641 | COMPAT_SYSCALL_DEFINE2(getrusage, int, who, struct compat_rusage __user *, ru) | |
1642 | { | |
1643 | struct rusage r; | |
1644 | ||
1645 | if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN && | |
1646 | who != RUSAGE_THREAD) | |
1647 | return -EINVAL; | |
1648 | ||
1649 | k_getrusage(current, who, &r); | |
1650 | return put_compat_rusage(&r, ru); | |
1651 | } | |
1652 | #endif | |
1653 | ||
e48fbb69 | 1654 | SYSCALL_DEFINE1(umask, int, mask) |
1da177e4 LT |
1655 | { |
1656 | mask = xchg(¤t->fs->umask, mask & S_IRWXUGO); | |
1657 | return mask; | |
1658 | } | |
3b7391de | 1659 | |
6e399cd1 | 1660 | static int prctl_set_mm_exe_file(struct mm_struct *mm, unsigned int fd) |
b32dfe37 | 1661 | { |
2903ff01 | 1662 | struct fd exe; |
6e399cd1 | 1663 | struct file *old_exe, *exe_file; |
496ad9aa | 1664 | struct inode *inode; |
2903ff01 | 1665 | int err; |
b32dfe37 | 1666 | |
2903ff01 AV |
1667 | exe = fdget(fd); |
1668 | if (!exe.file) | |
b32dfe37 CG |
1669 | return -EBADF; |
1670 | ||
496ad9aa | 1671 | inode = file_inode(exe.file); |
b32dfe37 CG |
1672 | |
1673 | /* | |
1674 | * Because the original mm->exe_file points to executable file, make | |
1675 | * sure that this one is executable as well, to avoid breaking an | |
1676 | * overall picture. | |
1677 | */ | |
1678 | err = -EACCES; | |
90f8572b | 1679 | if (!S_ISREG(inode->i_mode) || path_noexec(&exe.file->f_path)) |
b32dfe37 CG |
1680 | goto exit; |
1681 | ||
496ad9aa | 1682 | err = inode_permission(inode, MAY_EXEC); |
b32dfe37 CG |
1683 | if (err) |
1684 | goto exit; | |
1685 | ||
bafb282d | 1686 | /* |
4229fb1d | 1687 | * Forbid mm->exe_file change if old file still mapped. |
bafb282d | 1688 | */ |
6e399cd1 | 1689 | exe_file = get_mm_exe_file(mm); |
bafb282d | 1690 | err = -EBUSY; |
6e399cd1 | 1691 | if (exe_file) { |
4229fb1d KK |
1692 | struct vm_area_struct *vma; |
1693 | ||
6e399cd1 DB |
1694 | down_read(&mm->mmap_sem); |
1695 | for (vma = mm->mmap; vma; vma = vma->vm_next) { | |
1696 | if (!vma->vm_file) | |
1697 | continue; | |
1698 | if (path_equal(&vma->vm_file->f_path, | |
1699 | &exe_file->f_path)) | |
1700 | goto exit_err; | |
1701 | } | |
1702 | ||
1703 | up_read(&mm->mmap_sem); | |
1704 | fput(exe_file); | |
bafb282d KK |
1705 | } |
1706 | ||
4229fb1d | 1707 | err = 0; |
6e399cd1 DB |
1708 | /* set the new file, lockless */ |
1709 | get_file(exe.file); | |
1710 | old_exe = xchg(&mm->exe_file, exe.file); | |
1711 | if (old_exe) | |
1712 | fput(old_exe); | |
b32dfe37 | 1713 | exit: |
2903ff01 | 1714 | fdput(exe); |
b32dfe37 | 1715 | return err; |
6e399cd1 DB |
1716 | exit_err: |
1717 | up_read(&mm->mmap_sem); | |
1718 | fput(exe_file); | |
1719 | goto exit; | |
b32dfe37 CG |
1720 | } |
1721 | ||
f606b77f CG |
1722 | /* |
1723 | * WARNING: we don't require any capability here so be very careful | |
1724 | * in what is allowed for modification from userspace. | |
1725 | */ | |
1726 | static int validate_prctl_map(struct prctl_mm_map *prctl_map) | |
1727 | { | |
1728 | unsigned long mmap_max_addr = TASK_SIZE; | |
1729 | struct mm_struct *mm = current->mm; | |
1730 | int error = -EINVAL, i; | |
1731 | ||
1732 | static const unsigned char offsets[] = { | |
1733 | offsetof(struct prctl_mm_map, start_code), | |
1734 | offsetof(struct prctl_mm_map, end_code), | |
1735 | offsetof(struct prctl_mm_map, start_data), | |
1736 | offsetof(struct prctl_mm_map, end_data), | |
1737 | offsetof(struct prctl_mm_map, start_brk), | |
1738 | offsetof(struct prctl_mm_map, brk), | |
1739 | offsetof(struct prctl_mm_map, start_stack), | |
1740 | offsetof(struct prctl_mm_map, arg_start), | |
1741 | offsetof(struct prctl_mm_map, arg_end), | |
1742 | offsetof(struct prctl_mm_map, env_start), | |
1743 | offsetof(struct prctl_mm_map, env_end), | |
1744 | }; | |
1745 | ||
1746 | /* | |
1747 | * Make sure the members are not somewhere outside | |
1748 | * of allowed address space. | |
1749 | */ | |
1750 | for (i = 0; i < ARRAY_SIZE(offsets); i++) { | |
1751 | u64 val = *(u64 *)((char *)prctl_map + offsets[i]); | |
1752 | ||
1753 | if ((unsigned long)val >= mmap_max_addr || | |
1754 | (unsigned long)val < mmap_min_addr) | |
1755 | goto out; | |
1756 | } | |
1757 | ||
1758 | /* | |
1759 | * Make sure the pairs are ordered. | |
1760 | */ | |
1761 | #define __prctl_check_order(__m1, __op, __m2) \ | |
1762 | ((unsigned long)prctl_map->__m1 __op \ | |
1763 | (unsigned long)prctl_map->__m2) ? 0 : -EINVAL | |
1764 | error = __prctl_check_order(start_code, <, end_code); | |
1765 | error |= __prctl_check_order(start_data, <, end_data); | |
1766 | error |= __prctl_check_order(start_brk, <=, brk); | |
1767 | error |= __prctl_check_order(arg_start, <=, arg_end); | |
1768 | error |= __prctl_check_order(env_start, <=, env_end); | |
1769 | if (error) | |
1770 | goto out; | |
1771 | #undef __prctl_check_order | |
1772 | ||
1773 | error = -EINVAL; | |
1774 | ||
1775 | /* | |
1776 | * @brk should be after @end_data in traditional maps. | |
1777 | */ | |
1778 | if (prctl_map->start_brk <= prctl_map->end_data || | |
1779 | prctl_map->brk <= prctl_map->end_data) | |
1780 | goto out; | |
1781 | ||
1782 | /* | |
1783 | * Neither we should allow to override limits if they set. | |
1784 | */ | |
1785 | if (check_data_rlimit(rlimit(RLIMIT_DATA), prctl_map->brk, | |
1786 | prctl_map->start_brk, prctl_map->end_data, | |
1787 | prctl_map->start_data)) | |
1788 | goto out; | |
1789 | ||
1790 | /* | |
1791 | * Someone is trying to cheat the auxv vector. | |
1792 | */ | |
1793 | if (prctl_map->auxv_size) { | |
1794 | if (!prctl_map->auxv || prctl_map->auxv_size > sizeof(mm->saved_auxv)) | |
1795 | goto out; | |
1796 | } | |
1797 | ||
1798 | /* | |
1799 | * Finally, make sure the caller has the rights to | |
1800 | * change /proc/pid/exe link: only local root should | |
1801 | * be allowed to. | |
1802 | */ | |
1803 | if (prctl_map->exe_fd != (u32)-1) { | |
1804 | struct user_namespace *ns = current_user_ns(); | |
1805 | const struct cred *cred = current_cred(); | |
1806 | ||
1807 | if (!uid_eq(cred->uid, make_kuid(ns, 0)) || | |
1808 | !gid_eq(cred->gid, make_kgid(ns, 0))) | |
1809 | goto out; | |
1810 | } | |
1811 | ||
1812 | error = 0; | |
1813 | out: | |
1814 | return error; | |
1815 | } | |
1816 | ||
4a00e9df | 1817 | #ifdef CONFIG_CHECKPOINT_RESTORE |
f606b77f CG |
1818 | static int prctl_set_mm_map(int opt, const void __user *addr, unsigned long data_size) |
1819 | { | |
1820 | struct prctl_mm_map prctl_map = { .exe_fd = (u32)-1, }; | |
1821 | unsigned long user_auxv[AT_VECTOR_SIZE]; | |
1822 | struct mm_struct *mm = current->mm; | |
1823 | int error; | |
1824 | ||
1825 | BUILD_BUG_ON(sizeof(user_auxv) != sizeof(mm->saved_auxv)); | |
1826 | BUILD_BUG_ON(sizeof(struct prctl_mm_map) > 256); | |
1827 | ||
1828 | if (opt == PR_SET_MM_MAP_SIZE) | |
1829 | return put_user((unsigned int)sizeof(prctl_map), | |
1830 | (unsigned int __user *)addr); | |
1831 | ||
1832 | if (data_size != sizeof(prctl_map)) | |
1833 | return -EINVAL; | |
1834 | ||
1835 | if (copy_from_user(&prctl_map, addr, sizeof(prctl_map))) | |
1836 | return -EFAULT; | |
1837 | ||
1838 | error = validate_prctl_map(&prctl_map); | |
1839 | if (error) | |
1840 | return error; | |
1841 | ||
1842 | if (prctl_map.auxv_size) { | |
1843 | memset(user_auxv, 0, sizeof(user_auxv)); | |
1844 | if (copy_from_user(user_auxv, | |
1845 | (const void __user *)prctl_map.auxv, | |
1846 | prctl_map.auxv_size)) | |
1847 | return -EFAULT; | |
1848 | ||
1849 | /* Last entry must be AT_NULL as specification requires */ | |
1850 | user_auxv[AT_VECTOR_SIZE - 2] = AT_NULL; | |
1851 | user_auxv[AT_VECTOR_SIZE - 1] = AT_NULL; | |
1852 | } | |
1853 | ||
ddf1d398 | 1854 | if (prctl_map.exe_fd != (u32)-1) { |
6e399cd1 | 1855 | error = prctl_set_mm_exe_file(mm, prctl_map.exe_fd); |
ddf1d398 MG |
1856 | if (error) |
1857 | return error; | |
1858 | } | |
1859 | ||
1860 | down_write(&mm->mmap_sem); | |
f606b77f CG |
1861 | |
1862 | /* | |
1863 | * We don't validate if these members are pointing to | |
1864 | * real present VMAs because application may have correspond | |
1865 | * VMAs already unmapped and kernel uses these members for statistics | |
1866 | * output in procfs mostly, except | |
1867 | * | |
1868 | * - @start_brk/@brk which are used in do_brk but kernel lookups | |
1869 | * for VMAs when updating these memvers so anything wrong written | |
1870 | * here cause kernel to swear at userspace program but won't lead | |
1871 | * to any problem in kernel itself | |
1872 | */ | |
1873 | ||
1874 | mm->start_code = prctl_map.start_code; | |
1875 | mm->end_code = prctl_map.end_code; | |
1876 | mm->start_data = prctl_map.start_data; | |
1877 | mm->end_data = prctl_map.end_data; | |
1878 | mm->start_brk = prctl_map.start_brk; | |
1879 | mm->brk = prctl_map.brk; | |
1880 | mm->start_stack = prctl_map.start_stack; | |
1881 | mm->arg_start = prctl_map.arg_start; | |
1882 | mm->arg_end = prctl_map.arg_end; | |
1883 | mm->env_start = prctl_map.env_start; | |
1884 | mm->env_end = prctl_map.env_end; | |
1885 | ||
1886 | /* | |
1887 | * Note this update of @saved_auxv is lockless thus | |
1888 | * if someone reads this member in procfs while we're | |
1889 | * updating -- it may get partly updated results. It's | |
1890 | * known and acceptable trade off: we leave it as is to | |
1891 | * not introduce additional locks here making the kernel | |
1892 | * more complex. | |
1893 | */ | |
1894 | if (prctl_map.auxv_size) | |
1895 | memcpy(mm->saved_auxv, user_auxv, sizeof(user_auxv)); | |
1896 | ||
ddf1d398 MG |
1897 | up_write(&mm->mmap_sem); |
1898 | return 0; | |
f606b77f CG |
1899 | } |
1900 | #endif /* CONFIG_CHECKPOINT_RESTORE */ | |
1901 | ||
4a00e9df AD |
1902 | static int prctl_set_auxv(struct mm_struct *mm, unsigned long addr, |
1903 | unsigned long len) | |
1904 | { | |
1905 | /* | |
1906 | * This doesn't move the auxiliary vector itself since it's pinned to | |
1907 | * mm_struct, but it permits filling the vector with new values. It's | |
1908 | * up to the caller to provide sane values here, otherwise userspace | |
1909 | * tools which use this vector might be unhappy. | |
1910 | */ | |
1911 | unsigned long user_auxv[AT_VECTOR_SIZE]; | |
1912 | ||
1913 | if (len > sizeof(user_auxv)) | |
1914 | return -EINVAL; | |
1915 | ||
1916 | if (copy_from_user(user_auxv, (const void __user *)addr, len)) | |
1917 | return -EFAULT; | |
1918 | ||
1919 | /* Make sure the last entry is always AT_NULL */ | |
1920 | user_auxv[AT_VECTOR_SIZE - 2] = 0; | |
1921 | user_auxv[AT_VECTOR_SIZE - 1] = 0; | |
1922 | ||
1923 | BUILD_BUG_ON(sizeof(user_auxv) != sizeof(mm->saved_auxv)); | |
1924 | ||
1925 | task_lock(current); | |
1926 | memcpy(mm->saved_auxv, user_auxv, len); | |
1927 | task_unlock(current); | |
1928 | ||
1929 | return 0; | |
1930 | } | |
1931 | ||
028ee4be CG |
1932 | static int prctl_set_mm(int opt, unsigned long addr, |
1933 | unsigned long arg4, unsigned long arg5) | |
1934 | { | |
028ee4be | 1935 | struct mm_struct *mm = current->mm; |
4a00e9df | 1936 | struct prctl_mm_map prctl_map; |
fe8c7f5c CG |
1937 | struct vm_area_struct *vma; |
1938 | int error; | |
028ee4be | 1939 | |
f606b77f CG |
1940 | if (arg5 || (arg4 && (opt != PR_SET_MM_AUXV && |
1941 | opt != PR_SET_MM_MAP && | |
1942 | opt != PR_SET_MM_MAP_SIZE))) | |
028ee4be CG |
1943 | return -EINVAL; |
1944 | ||
f606b77f CG |
1945 | #ifdef CONFIG_CHECKPOINT_RESTORE |
1946 | if (opt == PR_SET_MM_MAP || opt == PR_SET_MM_MAP_SIZE) | |
1947 | return prctl_set_mm_map(opt, (const void __user *)addr, arg4); | |
1948 | #endif | |
1949 | ||
79f0713d | 1950 | if (!capable(CAP_SYS_RESOURCE)) |
028ee4be CG |
1951 | return -EPERM; |
1952 | ||
6e399cd1 DB |
1953 | if (opt == PR_SET_MM_EXE_FILE) |
1954 | return prctl_set_mm_exe_file(mm, (unsigned int)addr); | |
b32dfe37 | 1955 | |
4a00e9df AD |
1956 | if (opt == PR_SET_MM_AUXV) |
1957 | return prctl_set_auxv(mm, addr, arg4); | |
1958 | ||
1ad75b9e | 1959 | if (addr >= TASK_SIZE || addr < mmap_min_addr) |
028ee4be CG |
1960 | return -EINVAL; |
1961 | ||
fe8c7f5c CG |
1962 | error = -EINVAL; |
1963 | ||
ddf1d398 | 1964 | down_write(&mm->mmap_sem); |
028ee4be CG |
1965 | vma = find_vma(mm, addr); |
1966 | ||
4a00e9df AD |
1967 | prctl_map.start_code = mm->start_code; |
1968 | prctl_map.end_code = mm->end_code; | |
1969 | prctl_map.start_data = mm->start_data; | |
1970 | prctl_map.end_data = mm->end_data; | |
1971 | prctl_map.start_brk = mm->start_brk; | |
1972 | prctl_map.brk = mm->brk; | |
1973 | prctl_map.start_stack = mm->start_stack; | |
1974 | prctl_map.arg_start = mm->arg_start; | |
1975 | prctl_map.arg_end = mm->arg_end; | |
1976 | prctl_map.env_start = mm->env_start; | |
1977 | prctl_map.env_end = mm->env_end; | |
1978 | prctl_map.auxv = NULL; | |
1979 | prctl_map.auxv_size = 0; | |
1980 | prctl_map.exe_fd = -1; | |
1981 | ||
028ee4be CG |
1982 | switch (opt) { |
1983 | case PR_SET_MM_START_CODE: | |
4a00e9df | 1984 | prctl_map.start_code = addr; |
fe8c7f5c | 1985 | break; |
028ee4be | 1986 | case PR_SET_MM_END_CODE: |
4a00e9df | 1987 | prctl_map.end_code = addr; |
028ee4be | 1988 | break; |
028ee4be | 1989 | case PR_SET_MM_START_DATA: |
4a00e9df | 1990 | prctl_map.start_data = addr; |
028ee4be | 1991 | break; |
fe8c7f5c | 1992 | case PR_SET_MM_END_DATA: |
4a00e9df AD |
1993 | prctl_map.end_data = addr; |
1994 | break; | |
1995 | case PR_SET_MM_START_STACK: | |
1996 | prctl_map.start_stack = addr; | |
028ee4be | 1997 | break; |
028ee4be | 1998 | case PR_SET_MM_START_BRK: |
4a00e9df | 1999 | prctl_map.start_brk = addr; |
028ee4be | 2000 | break; |
028ee4be | 2001 | case PR_SET_MM_BRK: |
4a00e9df | 2002 | prctl_map.brk = addr; |
028ee4be | 2003 | break; |
4a00e9df AD |
2004 | case PR_SET_MM_ARG_START: |
2005 | prctl_map.arg_start = addr; | |
2006 | break; | |
2007 | case PR_SET_MM_ARG_END: | |
2008 | prctl_map.arg_end = addr; | |
2009 | break; | |
2010 | case PR_SET_MM_ENV_START: | |
2011 | prctl_map.env_start = addr; | |
2012 | break; | |
2013 | case PR_SET_MM_ENV_END: | |
2014 | prctl_map.env_end = addr; | |
2015 | break; | |
2016 | default: | |
2017 | goto out; | |
2018 | } | |
2019 | ||
2020 | error = validate_prctl_map(&prctl_map); | |
2021 | if (error) | |
2022 | goto out; | |
028ee4be | 2023 | |
4a00e9df | 2024 | switch (opt) { |
fe8c7f5c CG |
2025 | /* |
2026 | * If command line arguments and environment | |
2027 | * are placed somewhere else on stack, we can | |
2028 | * set them up here, ARG_START/END to setup | |
2029 | * command line argumets and ENV_START/END | |
2030 | * for environment. | |
2031 | */ | |
2032 | case PR_SET_MM_START_STACK: | |
2033 | case PR_SET_MM_ARG_START: | |
2034 | case PR_SET_MM_ARG_END: | |
2035 | case PR_SET_MM_ENV_START: | |
2036 | case PR_SET_MM_ENV_END: | |
2037 | if (!vma) { | |
2038 | error = -EFAULT; | |
2039 | goto out; | |
2040 | } | |
028ee4be CG |
2041 | } |
2042 | ||
4a00e9df AD |
2043 | mm->start_code = prctl_map.start_code; |
2044 | mm->end_code = prctl_map.end_code; | |
2045 | mm->start_data = prctl_map.start_data; | |
2046 | mm->end_data = prctl_map.end_data; | |
2047 | mm->start_brk = prctl_map.start_brk; | |
2048 | mm->brk = prctl_map.brk; | |
2049 | mm->start_stack = prctl_map.start_stack; | |
2050 | mm->arg_start = prctl_map.arg_start; | |
2051 | mm->arg_end = prctl_map.arg_end; | |
2052 | mm->env_start = prctl_map.env_start; | |
2053 | mm->env_end = prctl_map.env_end; | |
2054 | ||
028ee4be | 2055 | error = 0; |
028ee4be | 2056 | out: |
ddf1d398 | 2057 | up_write(&mm->mmap_sem); |
028ee4be CG |
2058 | return error; |
2059 | } | |
300f786b | 2060 | |
52b36941 | 2061 | #ifdef CONFIG_CHECKPOINT_RESTORE |
300f786b CG |
2062 | static int prctl_get_tid_address(struct task_struct *me, int __user **tid_addr) |
2063 | { | |
2064 | return put_user(me->clear_child_tid, tid_addr); | |
2065 | } | |
52b36941 | 2066 | #else |
300f786b CG |
2067 | static int prctl_get_tid_address(struct task_struct *me, int __user **tid_addr) |
2068 | { | |
2069 | return -EINVAL; | |
2070 | } | |
028ee4be CG |
2071 | #endif |
2072 | ||
749860ce PT |
2073 | static int propagate_has_child_subreaper(struct task_struct *p, void *data) |
2074 | { | |
2075 | /* | |
2076 | * If task has has_child_subreaper - all its decendants | |
2077 | * already have these flag too and new decendants will | |
2078 | * inherit it on fork, skip them. | |
2079 | * | |
2080 | * If we've found child_reaper - skip descendants in | |
2081 | * it's subtree as they will never get out pidns. | |
2082 | */ | |
2083 | if (p->signal->has_child_subreaper || | |
2084 | is_child_reaper(task_pid(p))) | |
2085 | return 0; | |
2086 | ||
2087 | p->signal->has_child_subreaper = 1; | |
2088 | return 1; | |
2089 | } | |
2090 | ||
c4ea37c2 HC |
2091 | SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3, |
2092 | unsigned long, arg4, unsigned long, arg5) | |
1da177e4 | 2093 | { |
b6dff3ec DH |
2094 | struct task_struct *me = current; |
2095 | unsigned char comm[sizeof(me->comm)]; | |
2096 | long error; | |
1da177e4 | 2097 | |
d84f4f99 DH |
2098 | error = security_task_prctl(option, arg2, arg3, arg4, arg5); |
2099 | if (error != -ENOSYS) | |
1da177e4 LT |
2100 | return error; |
2101 | ||
d84f4f99 | 2102 | error = 0; |
1da177e4 | 2103 | switch (option) { |
f3cbd435 AM |
2104 | case PR_SET_PDEATHSIG: |
2105 | if (!valid_signal(arg2)) { | |
2106 | error = -EINVAL; | |
1da177e4 | 2107 | break; |
f3cbd435 AM |
2108 | } |
2109 | me->pdeath_signal = arg2; | |
2110 | break; | |
2111 | case PR_GET_PDEATHSIG: | |
2112 | error = put_user(me->pdeath_signal, (int __user *)arg2); | |
2113 | break; | |
2114 | case PR_GET_DUMPABLE: | |
2115 | error = get_dumpable(me->mm); | |
2116 | break; | |
2117 | case PR_SET_DUMPABLE: | |
2118 | if (arg2 != SUID_DUMP_DISABLE && arg2 != SUID_DUMP_USER) { | |
2119 | error = -EINVAL; | |
1da177e4 | 2120 | break; |
f3cbd435 AM |
2121 | } |
2122 | set_dumpable(me->mm, arg2); | |
2123 | break; | |
1da177e4 | 2124 | |
f3cbd435 AM |
2125 | case PR_SET_UNALIGN: |
2126 | error = SET_UNALIGN_CTL(me, arg2); | |
2127 | break; | |
2128 | case PR_GET_UNALIGN: | |
2129 | error = GET_UNALIGN_CTL(me, arg2); | |
2130 | break; | |
2131 | case PR_SET_FPEMU: | |
2132 | error = SET_FPEMU_CTL(me, arg2); | |
2133 | break; | |
2134 | case PR_GET_FPEMU: | |
2135 | error = GET_FPEMU_CTL(me, arg2); | |
2136 | break; | |
2137 | case PR_SET_FPEXC: | |
2138 | error = SET_FPEXC_CTL(me, arg2); | |
2139 | break; | |
2140 | case PR_GET_FPEXC: | |
2141 | error = GET_FPEXC_CTL(me, arg2); | |
2142 | break; | |
2143 | case PR_GET_TIMING: | |
2144 | error = PR_TIMING_STATISTICAL; | |
2145 | break; | |
2146 | case PR_SET_TIMING: | |
2147 | if (arg2 != PR_TIMING_STATISTICAL) | |
2148 | error = -EINVAL; | |
2149 | break; | |
2150 | case PR_SET_NAME: | |
2151 | comm[sizeof(me->comm) - 1] = 0; | |
2152 | if (strncpy_from_user(comm, (char __user *)arg2, | |
2153 | sizeof(me->comm) - 1) < 0) | |
2154 | return -EFAULT; | |
2155 | set_task_comm(me, comm); | |
2156 | proc_comm_connector(me); | |
2157 | break; | |
2158 | case PR_GET_NAME: | |
2159 | get_task_comm(comm, me); | |
2160 | if (copy_to_user((char __user *)arg2, comm, sizeof(comm))) | |
2161 | return -EFAULT; | |
2162 | break; | |
2163 | case PR_GET_ENDIAN: | |
2164 | error = GET_ENDIAN(me, arg2); | |
2165 | break; | |
2166 | case PR_SET_ENDIAN: | |
2167 | error = SET_ENDIAN(me, arg2); | |
2168 | break; | |
2169 | case PR_GET_SECCOMP: | |
2170 | error = prctl_get_seccomp(); | |
2171 | break; | |
2172 | case PR_SET_SECCOMP: | |
2173 | error = prctl_set_seccomp(arg2, (char __user *)arg3); | |
2174 | break; | |
2175 | case PR_GET_TSC: | |
2176 | error = GET_TSC_CTL(arg2); | |
2177 | break; | |
2178 | case PR_SET_TSC: | |
2179 | error = SET_TSC_CTL(arg2); | |
2180 | break; | |
2181 | case PR_TASK_PERF_EVENTS_DISABLE: | |
2182 | error = perf_event_task_disable(); | |
2183 | break; | |
2184 | case PR_TASK_PERF_EVENTS_ENABLE: | |
2185 | error = perf_event_task_enable(); | |
2186 | break; | |
2187 | case PR_GET_TIMERSLACK: | |
da8b44d5 JS |
2188 | if (current->timer_slack_ns > ULONG_MAX) |
2189 | error = ULONG_MAX; | |
2190 | else | |
2191 | error = current->timer_slack_ns; | |
f3cbd435 AM |
2192 | break; |
2193 | case PR_SET_TIMERSLACK: | |
2194 | if (arg2 <= 0) | |
2195 | current->timer_slack_ns = | |
6976675d | 2196 | current->default_timer_slack_ns; |
f3cbd435 AM |
2197 | else |
2198 | current->timer_slack_ns = arg2; | |
2199 | break; | |
2200 | case PR_MCE_KILL: | |
2201 | if (arg4 | arg5) | |
2202 | return -EINVAL; | |
2203 | switch (arg2) { | |
2204 | case PR_MCE_KILL_CLEAR: | |
2205 | if (arg3 != 0) | |
4db96cf0 | 2206 | return -EINVAL; |
f3cbd435 | 2207 | current->flags &= ~PF_MCE_PROCESS; |
4db96cf0 | 2208 | break; |
f3cbd435 AM |
2209 | case PR_MCE_KILL_SET: |
2210 | current->flags |= PF_MCE_PROCESS; | |
2211 | if (arg3 == PR_MCE_KILL_EARLY) | |
2212 | current->flags |= PF_MCE_EARLY; | |
2213 | else if (arg3 == PR_MCE_KILL_LATE) | |
2214 | current->flags &= ~PF_MCE_EARLY; | |
2215 | else if (arg3 == PR_MCE_KILL_DEFAULT) | |
2216 | current->flags &= | |
2217 | ~(PF_MCE_EARLY|PF_MCE_PROCESS); | |
1087e9b4 | 2218 | else |
259e5e6c | 2219 | return -EINVAL; |
259e5e6c | 2220 | break; |
1da177e4 | 2221 | default: |
f3cbd435 AM |
2222 | return -EINVAL; |
2223 | } | |
2224 | break; | |
2225 | case PR_MCE_KILL_GET: | |
2226 | if (arg2 | arg3 | arg4 | arg5) | |
2227 | return -EINVAL; | |
2228 | if (current->flags & PF_MCE_PROCESS) | |
2229 | error = (current->flags & PF_MCE_EARLY) ? | |
2230 | PR_MCE_KILL_EARLY : PR_MCE_KILL_LATE; | |
2231 | else | |
2232 | error = PR_MCE_KILL_DEFAULT; | |
2233 | break; | |
2234 | case PR_SET_MM: | |
2235 | error = prctl_set_mm(arg2, arg3, arg4, arg5); | |
2236 | break; | |
2237 | case PR_GET_TID_ADDRESS: | |
2238 | error = prctl_get_tid_address(me, (int __user **)arg2); | |
2239 | break; | |
2240 | case PR_SET_CHILD_SUBREAPER: | |
2241 | me->signal->is_child_subreaper = !!arg2; | |
749860ce PT |
2242 | if (!arg2) |
2243 | break; | |
2244 | ||
2245 | walk_process_tree(me, propagate_has_child_subreaper, NULL); | |
f3cbd435 AM |
2246 | break; |
2247 | case PR_GET_CHILD_SUBREAPER: | |
2248 | error = put_user(me->signal->is_child_subreaper, | |
2249 | (int __user *)arg2); | |
2250 | break; | |
2251 | case PR_SET_NO_NEW_PRIVS: | |
2252 | if (arg2 != 1 || arg3 || arg4 || arg5) | |
2253 | return -EINVAL; | |
2254 | ||
1d4457f9 | 2255 | task_set_no_new_privs(current); |
f3cbd435 AM |
2256 | break; |
2257 | case PR_GET_NO_NEW_PRIVS: | |
2258 | if (arg2 || arg3 || arg4 || arg5) | |
2259 | return -EINVAL; | |
1d4457f9 | 2260 | return task_no_new_privs(current) ? 1 : 0; |
a0715cc2 AT |
2261 | case PR_GET_THP_DISABLE: |
2262 | if (arg2 || arg3 || arg4 || arg5) | |
2263 | return -EINVAL; | |
2264 | error = !!(me->mm->def_flags & VM_NOHUGEPAGE); | |
2265 | break; | |
2266 | case PR_SET_THP_DISABLE: | |
2267 | if (arg3 || arg4 || arg5) | |
2268 | return -EINVAL; | |
17b0573d MH |
2269 | if (down_write_killable(&me->mm->mmap_sem)) |
2270 | return -EINTR; | |
a0715cc2 AT |
2271 | if (arg2) |
2272 | me->mm->def_flags |= VM_NOHUGEPAGE; | |
2273 | else | |
2274 | me->mm->def_flags &= ~VM_NOHUGEPAGE; | |
2275 | up_write(&me->mm->mmap_sem); | |
2276 | break; | |
fe3d197f | 2277 | case PR_MPX_ENABLE_MANAGEMENT: |
e9d1b4f3 DH |
2278 | if (arg2 || arg3 || arg4 || arg5) |
2279 | return -EINVAL; | |
46a6e0cf | 2280 | error = MPX_ENABLE_MANAGEMENT(); |
fe3d197f DH |
2281 | break; |
2282 | case PR_MPX_DISABLE_MANAGEMENT: | |
e9d1b4f3 DH |
2283 | if (arg2 || arg3 || arg4 || arg5) |
2284 | return -EINVAL; | |
46a6e0cf | 2285 | error = MPX_DISABLE_MANAGEMENT(); |
fe3d197f | 2286 | break; |
9791554b PB |
2287 | case PR_SET_FP_MODE: |
2288 | error = SET_FP_MODE(me, arg2); | |
2289 | break; | |
2290 | case PR_GET_FP_MODE: | |
2291 | error = GET_FP_MODE(me); | |
2292 | break; | |
f3cbd435 AM |
2293 | default: |
2294 | error = -EINVAL; | |
2295 | break; | |
1da177e4 LT |
2296 | } |
2297 | return error; | |
2298 | } | |
3cfc348b | 2299 | |
836f92ad HC |
2300 | SYSCALL_DEFINE3(getcpu, unsigned __user *, cpup, unsigned __user *, nodep, |
2301 | struct getcpu_cache __user *, unused) | |
3cfc348b AK |
2302 | { |
2303 | int err = 0; | |
2304 | int cpu = raw_smp_processor_id(); | |
ec94fc3d | 2305 | |
3cfc348b AK |
2306 | if (cpup) |
2307 | err |= put_user(cpu, cpup); | |
2308 | if (nodep) | |
2309 | err |= put_user(cpu_to_node(cpu), nodep); | |
3cfc348b AK |
2310 | return err ? -EFAULT : 0; |
2311 | } | |
10a0a8d4 | 2312 | |
4a22f166 SR |
2313 | /** |
2314 | * do_sysinfo - fill in sysinfo struct | |
2315 | * @info: pointer to buffer to fill | |
2316 | */ | |
2317 | static int do_sysinfo(struct sysinfo *info) | |
2318 | { | |
2319 | unsigned long mem_total, sav_total; | |
2320 | unsigned int mem_unit, bitcount; | |
2321 | struct timespec tp; | |
2322 | ||
2323 | memset(info, 0, sizeof(struct sysinfo)); | |
2324 | ||
45c64940 | 2325 | get_monotonic_boottime(&tp); |
4a22f166 SR |
2326 | info->uptime = tp.tv_sec + (tp.tv_nsec ? 1 : 0); |
2327 | ||
2328 | get_avenrun(info->loads, 0, SI_LOAD_SHIFT - FSHIFT); | |
2329 | ||
2330 | info->procs = nr_threads; | |
2331 | ||
2332 | si_meminfo(info); | |
2333 | si_swapinfo(info); | |
2334 | ||
2335 | /* | |
2336 | * If the sum of all the available memory (i.e. ram + swap) | |
2337 | * is less than can be stored in a 32 bit unsigned long then | |
2338 | * we can be binary compatible with 2.2.x kernels. If not, | |
2339 | * well, in that case 2.2.x was broken anyways... | |
2340 | * | |
2341 | * -Erik Andersen <andersee@debian.org> | |
2342 | */ | |
2343 | ||
2344 | mem_total = info->totalram + info->totalswap; | |
2345 | if (mem_total < info->totalram || mem_total < info->totalswap) | |
2346 | goto out; | |
2347 | bitcount = 0; | |
2348 | mem_unit = info->mem_unit; | |
2349 | while (mem_unit > 1) { | |
2350 | bitcount++; | |
2351 | mem_unit >>= 1; | |
2352 | sav_total = mem_total; | |
2353 | mem_total <<= 1; | |
2354 | if (mem_total < sav_total) | |
2355 | goto out; | |
2356 | } | |
2357 | ||
2358 | /* | |
2359 | * If mem_total did not overflow, multiply all memory values by | |
2360 | * info->mem_unit and set it to 1. This leaves things compatible | |
2361 | * with 2.2.x, and also retains compatibility with earlier 2.4.x | |
2362 | * kernels... | |
2363 | */ | |
2364 | ||
2365 | info->mem_unit = 1; | |
2366 | info->totalram <<= bitcount; | |
2367 | info->freeram <<= bitcount; | |
2368 | info->sharedram <<= bitcount; | |
2369 | info->bufferram <<= bitcount; | |
2370 | info->totalswap <<= bitcount; | |
2371 | info->freeswap <<= bitcount; | |
2372 | info->totalhigh <<= bitcount; | |
2373 | info->freehigh <<= bitcount; | |
2374 | ||
2375 | out: | |
2376 | return 0; | |
2377 | } | |
2378 | ||
2379 | SYSCALL_DEFINE1(sysinfo, struct sysinfo __user *, info) | |
2380 | { | |
2381 | struct sysinfo val; | |
2382 | ||
2383 | do_sysinfo(&val); | |
2384 | ||
2385 | if (copy_to_user(info, &val, sizeof(struct sysinfo))) | |
2386 | return -EFAULT; | |
2387 | ||
2388 | return 0; | |
2389 | } | |
2390 | ||
2391 | #ifdef CONFIG_COMPAT | |
2392 | struct compat_sysinfo { | |
2393 | s32 uptime; | |
2394 | u32 loads[3]; | |
2395 | u32 totalram; | |
2396 | u32 freeram; | |
2397 | u32 sharedram; | |
2398 | u32 bufferram; | |
2399 | u32 totalswap; | |
2400 | u32 freeswap; | |
2401 | u16 procs; | |
2402 | u16 pad; | |
2403 | u32 totalhigh; | |
2404 | u32 freehigh; | |
2405 | u32 mem_unit; | |
2406 | char _f[20-2*sizeof(u32)-sizeof(int)]; | |
2407 | }; | |
2408 | ||
2409 | COMPAT_SYSCALL_DEFINE1(sysinfo, struct compat_sysinfo __user *, info) | |
2410 | { | |
2411 | struct sysinfo s; | |
2412 | ||
2413 | do_sysinfo(&s); | |
2414 | ||
2415 | /* Check to see if any memory value is too large for 32-bit and scale | |
2416 | * down if needed | |
2417 | */ | |
0baae41e | 2418 | if (upper_32_bits(s.totalram) || upper_32_bits(s.totalswap)) { |
4a22f166 SR |
2419 | int bitcount = 0; |
2420 | ||
2421 | while (s.mem_unit < PAGE_SIZE) { | |
2422 | s.mem_unit <<= 1; | |
2423 | bitcount++; | |
2424 | } | |
2425 | ||
2426 | s.totalram >>= bitcount; | |
2427 | s.freeram >>= bitcount; | |
2428 | s.sharedram >>= bitcount; | |
2429 | s.bufferram >>= bitcount; | |
2430 | s.totalswap >>= bitcount; | |
2431 | s.freeswap >>= bitcount; | |
2432 | s.totalhigh >>= bitcount; | |
2433 | s.freehigh >>= bitcount; | |
2434 | } | |
2435 | ||
2436 | if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) || | |
2437 | __put_user(s.uptime, &info->uptime) || | |
2438 | __put_user(s.loads[0], &info->loads[0]) || | |
2439 | __put_user(s.loads[1], &info->loads[1]) || | |
2440 | __put_user(s.loads[2], &info->loads[2]) || | |
2441 | __put_user(s.totalram, &info->totalram) || | |
2442 | __put_user(s.freeram, &info->freeram) || | |
2443 | __put_user(s.sharedram, &info->sharedram) || | |
2444 | __put_user(s.bufferram, &info->bufferram) || | |
2445 | __put_user(s.totalswap, &info->totalswap) || | |
2446 | __put_user(s.freeswap, &info->freeswap) || | |
2447 | __put_user(s.procs, &info->procs) || | |
2448 | __put_user(s.totalhigh, &info->totalhigh) || | |
2449 | __put_user(s.freehigh, &info->freehigh) || | |
2450 | __put_user(s.mem_unit, &info->mem_unit)) | |
2451 | return -EFAULT; | |
2452 | ||
2453 | return 0; | |
2454 | } | |
2455 | #endif /* CONFIG_COMPAT */ |