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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * linux/kernel/sys.c | |
4 | * | |
5 | * Copyright (C) 1991, 1992 Linus Torvalds | |
6 | */ | |
7 | ||
9984de1a | 8 | #include <linux/export.h> |
1da177e4 LT |
9 | #include <linux/mm.h> |
10 | #include <linux/utsname.h> | |
11 | #include <linux/mman.h> | |
1da177e4 LT |
12 | #include <linux/reboot.h> |
13 | #include <linux/prctl.h> | |
1da177e4 LT |
14 | #include <linux/highuid.h> |
15 | #include <linux/fs.h> | |
74da1ff7 | 16 | #include <linux/kmod.h> |
cdd6c482 | 17 | #include <linux/perf_event.h> |
3e88c553 | 18 | #include <linux/resource.h> |
dc009d92 | 19 | #include <linux/kernel.h> |
1da177e4 | 20 | #include <linux/workqueue.h> |
c59ede7b | 21 | #include <linux/capability.h> |
1da177e4 LT |
22 | #include <linux/device.h> |
23 | #include <linux/key.h> | |
24 | #include <linux/times.h> | |
25 | #include <linux/posix-timers.h> | |
26 | #include <linux/security.h> | |
27 | #include <linux/dcookies.h> | |
28 | #include <linux/suspend.h> | |
29 | #include <linux/tty.h> | |
7ed20e1a | 30 | #include <linux/signal.h> |
9f46080c | 31 | #include <linux/cn_proc.h> |
3cfc348b | 32 | #include <linux/getcpu.h> |
6eaeeaba | 33 | #include <linux/task_io_accounting_ops.h> |
1d9d02fe | 34 | #include <linux/seccomp.h> |
4047727e | 35 | #include <linux/cpu.h> |
e28cbf22 | 36 | #include <linux/personality.h> |
e3d5a27d | 37 | #include <linux/ptrace.h> |
5ad4e53b | 38 | #include <linux/fs_struct.h> |
b32dfe37 CG |
39 | #include <linux/file.h> |
40 | #include <linux/mount.h> | |
5a0e3ad6 | 41 | #include <linux/gfp.h> |
40dc166c | 42 | #include <linux/syscore_ops.h> |
be27425d AK |
43 | #include <linux/version.h> |
44 | #include <linux/ctype.h> | |
1da177e4 LT |
45 | |
46 | #include <linux/compat.h> | |
47 | #include <linux/syscalls.h> | |
00d7c05a | 48 | #include <linux/kprobes.h> |
acce292c | 49 | #include <linux/user_namespace.h> |
7fe5e042 | 50 | #include <linux/binfmts.h> |
1da177e4 | 51 | |
4a22f166 | 52 | #include <linux/sched.h> |
4eb5aaa3 | 53 | #include <linux/sched/autogroup.h> |
4f17722c | 54 | #include <linux/sched/loadavg.h> |
03441a34 | 55 | #include <linux/sched/stat.h> |
6e84f315 | 56 | #include <linux/sched/mm.h> |
f7ccbae4 | 57 | #include <linux/sched/coredump.h> |
29930025 | 58 | #include <linux/sched/task.h> |
32ef5517 | 59 | #include <linux/sched/cputime.h> |
4a22f166 SR |
60 | #include <linux/rcupdate.h> |
61 | #include <linux/uidgid.h> | |
62 | #include <linux/cred.h> | |
63 | ||
d34cff3e TG |
64 | #include <linux/nospec.h> |
65 | ||
04c6862c | 66 | #include <linux/kmsg_dump.h> |
be27425d AK |
67 | /* Move somewhere else to avoid recompiling? */ |
68 | #include <generated/utsrelease.h> | |
04c6862c | 69 | |
7c0f6ba6 | 70 | #include <linux/uaccess.h> |
1da177e4 LT |
71 | #include <asm/io.h> |
72 | #include <asm/unistd.h> | |
73 | ||
74 | #ifndef SET_UNALIGN_CTL | |
ec94fc3d | 75 | # define SET_UNALIGN_CTL(a, b) (-EINVAL) |
1da177e4 LT |
76 | #endif |
77 | #ifndef GET_UNALIGN_CTL | |
ec94fc3d | 78 | # define GET_UNALIGN_CTL(a, b) (-EINVAL) |
1da177e4 LT |
79 | #endif |
80 | #ifndef SET_FPEMU_CTL | |
ec94fc3d | 81 | # define SET_FPEMU_CTL(a, b) (-EINVAL) |
1da177e4 LT |
82 | #endif |
83 | #ifndef GET_FPEMU_CTL | |
ec94fc3d | 84 | # define GET_FPEMU_CTL(a, b) (-EINVAL) |
1da177e4 LT |
85 | #endif |
86 | #ifndef SET_FPEXC_CTL | |
ec94fc3d | 87 | # define SET_FPEXC_CTL(a, b) (-EINVAL) |
1da177e4 LT |
88 | #endif |
89 | #ifndef GET_FPEXC_CTL | |
ec94fc3d | 90 | # define GET_FPEXC_CTL(a, b) (-EINVAL) |
1da177e4 | 91 | #endif |
651d765d | 92 | #ifndef GET_ENDIAN |
ec94fc3d | 93 | # define GET_ENDIAN(a, b) (-EINVAL) |
651d765d AB |
94 | #endif |
95 | #ifndef SET_ENDIAN | |
ec94fc3d | 96 | # define SET_ENDIAN(a, b) (-EINVAL) |
651d765d | 97 | #endif |
8fb402bc EB |
98 | #ifndef GET_TSC_CTL |
99 | # define GET_TSC_CTL(a) (-EINVAL) | |
100 | #endif | |
101 | #ifndef SET_TSC_CTL | |
102 | # define SET_TSC_CTL(a) (-EINVAL) | |
103 | #endif | |
fe3d197f | 104 | #ifndef MPX_ENABLE_MANAGEMENT |
46a6e0cf | 105 | # define MPX_ENABLE_MANAGEMENT() (-EINVAL) |
fe3d197f DH |
106 | #endif |
107 | #ifndef MPX_DISABLE_MANAGEMENT | |
46a6e0cf | 108 | # define MPX_DISABLE_MANAGEMENT() (-EINVAL) |
fe3d197f | 109 | #endif |
9791554b PB |
110 | #ifndef GET_FP_MODE |
111 | # define GET_FP_MODE(a) (-EINVAL) | |
112 | #endif | |
113 | #ifndef SET_FP_MODE | |
114 | # define SET_FP_MODE(a,b) (-EINVAL) | |
115 | #endif | |
2d2123bc DM |
116 | #ifndef SVE_SET_VL |
117 | # define SVE_SET_VL(a) (-EINVAL) | |
118 | #endif | |
119 | #ifndef SVE_GET_VL | |
120 | # define SVE_GET_VL() (-EINVAL) | |
121 | #endif | |
1da177e4 LT |
122 | |
123 | /* | |
124 | * this is where the system-wide overflow UID and GID are defined, for | |
125 | * architectures that now have 32-bit UID/GID but didn't in the past | |
126 | */ | |
127 | ||
128 | int overflowuid = DEFAULT_OVERFLOWUID; | |
129 | int overflowgid = DEFAULT_OVERFLOWGID; | |
130 | ||
1da177e4 LT |
131 | EXPORT_SYMBOL(overflowuid); |
132 | EXPORT_SYMBOL(overflowgid); | |
1da177e4 LT |
133 | |
134 | /* | |
135 | * the same as above, but for filesystems which can only store a 16-bit | |
136 | * UID and GID. as such, this is needed on all architectures | |
137 | */ | |
138 | ||
139 | int fs_overflowuid = DEFAULT_FS_OVERFLOWUID; | |
140 | int fs_overflowgid = DEFAULT_FS_OVERFLOWUID; | |
141 | ||
142 | EXPORT_SYMBOL(fs_overflowuid); | |
143 | EXPORT_SYMBOL(fs_overflowgid); | |
144 | ||
fc832ad3 SH |
145 | /* |
146 | * Returns true if current's euid is same as p's uid or euid, | |
147 | * or has CAP_SYS_NICE to p's user_ns. | |
148 | * | |
149 | * Called with rcu_read_lock, creds are safe | |
150 | */ | |
151 | static bool set_one_prio_perm(struct task_struct *p) | |
152 | { | |
153 | const struct cred *cred = current_cred(), *pcred = __task_cred(p); | |
154 | ||
5af66203 EB |
155 | if (uid_eq(pcred->uid, cred->euid) || |
156 | uid_eq(pcred->euid, cred->euid)) | |
fc832ad3 | 157 | return true; |
c4a4d603 | 158 | if (ns_capable(pcred->user_ns, CAP_SYS_NICE)) |
fc832ad3 SH |
159 | return true; |
160 | return false; | |
161 | } | |
162 | ||
c69e8d9c DH |
163 | /* |
164 | * set the priority of a task | |
165 | * - the caller must hold the RCU read lock | |
166 | */ | |
1da177e4 LT |
167 | static int set_one_prio(struct task_struct *p, int niceval, int error) |
168 | { | |
169 | int no_nice; | |
170 | ||
fc832ad3 | 171 | if (!set_one_prio_perm(p)) { |
1da177e4 LT |
172 | error = -EPERM; |
173 | goto out; | |
174 | } | |
e43379f1 | 175 | if (niceval < task_nice(p) && !can_nice(p, niceval)) { |
1da177e4 LT |
176 | error = -EACCES; |
177 | goto out; | |
178 | } | |
179 | no_nice = security_task_setnice(p, niceval); | |
180 | if (no_nice) { | |
181 | error = no_nice; | |
182 | goto out; | |
183 | } | |
184 | if (error == -ESRCH) | |
185 | error = 0; | |
186 | set_user_nice(p, niceval); | |
187 | out: | |
188 | return error; | |
189 | } | |
190 | ||
754fe8d2 | 191 | SYSCALL_DEFINE3(setpriority, int, which, int, who, int, niceval) |
1da177e4 LT |
192 | { |
193 | struct task_struct *g, *p; | |
194 | struct user_struct *user; | |
86a264ab | 195 | const struct cred *cred = current_cred(); |
1da177e4 | 196 | int error = -EINVAL; |
41487c65 | 197 | struct pid *pgrp; |
7b44ab97 | 198 | kuid_t uid; |
1da177e4 | 199 | |
3e88c553 | 200 | if (which > PRIO_USER || which < PRIO_PROCESS) |
1da177e4 LT |
201 | goto out; |
202 | ||
203 | /* normalize: avoid signed division (rounding problems) */ | |
204 | error = -ESRCH; | |
c4a4d2f4 DY |
205 | if (niceval < MIN_NICE) |
206 | niceval = MIN_NICE; | |
207 | if (niceval > MAX_NICE) | |
208 | niceval = MAX_NICE; | |
1da177e4 | 209 | |
d4581a23 | 210 | rcu_read_lock(); |
1da177e4 LT |
211 | read_lock(&tasklist_lock); |
212 | switch (which) { | |
ec94fc3d | 213 | case PRIO_PROCESS: |
214 | if (who) | |
215 | p = find_task_by_vpid(who); | |
216 | else | |
217 | p = current; | |
218 | if (p) | |
219 | error = set_one_prio(p, niceval, error); | |
220 | break; | |
221 | case PRIO_PGRP: | |
222 | if (who) | |
223 | pgrp = find_vpid(who); | |
224 | else | |
225 | pgrp = task_pgrp(current); | |
226 | do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { | |
227 | error = set_one_prio(p, niceval, error); | |
228 | } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); | |
229 | break; | |
230 | case PRIO_USER: | |
231 | uid = make_kuid(cred->user_ns, who); | |
232 | user = cred->user; | |
233 | if (!who) | |
234 | uid = cred->uid; | |
235 | else if (!uid_eq(uid, cred->uid)) { | |
236 | user = find_user(uid); | |
237 | if (!user) | |
86a264ab | 238 | goto out_unlock; /* No processes for this user */ |
ec94fc3d | 239 | } |
240 | do_each_thread(g, p) { | |
8639b461 | 241 | if (uid_eq(task_uid(p), uid) && task_pid_vnr(p)) |
ec94fc3d | 242 | error = set_one_prio(p, niceval, error); |
243 | } while_each_thread(g, p); | |
244 | if (!uid_eq(uid, cred->uid)) | |
245 | free_uid(user); /* For find_user() */ | |
246 | break; | |
1da177e4 LT |
247 | } |
248 | out_unlock: | |
249 | read_unlock(&tasklist_lock); | |
d4581a23 | 250 | rcu_read_unlock(); |
1da177e4 LT |
251 | out: |
252 | return error; | |
253 | } | |
254 | ||
255 | /* | |
256 | * Ugh. To avoid negative return values, "getpriority()" will | |
257 | * not return the normal nice-value, but a negated value that | |
258 | * has been offset by 20 (ie it returns 40..1 instead of -20..19) | |
259 | * to stay compatible. | |
260 | */ | |
754fe8d2 | 261 | SYSCALL_DEFINE2(getpriority, int, which, int, who) |
1da177e4 LT |
262 | { |
263 | struct task_struct *g, *p; | |
264 | struct user_struct *user; | |
86a264ab | 265 | const struct cred *cred = current_cred(); |
1da177e4 | 266 | long niceval, retval = -ESRCH; |
41487c65 | 267 | struct pid *pgrp; |
7b44ab97 | 268 | kuid_t uid; |
1da177e4 | 269 | |
3e88c553 | 270 | if (which > PRIO_USER || which < PRIO_PROCESS) |
1da177e4 LT |
271 | return -EINVAL; |
272 | ||
70118837 | 273 | rcu_read_lock(); |
1da177e4 LT |
274 | read_lock(&tasklist_lock); |
275 | switch (which) { | |
ec94fc3d | 276 | case PRIO_PROCESS: |
277 | if (who) | |
278 | p = find_task_by_vpid(who); | |
279 | else | |
280 | p = current; | |
281 | if (p) { | |
282 | niceval = nice_to_rlimit(task_nice(p)); | |
283 | if (niceval > retval) | |
284 | retval = niceval; | |
285 | } | |
286 | break; | |
287 | case PRIO_PGRP: | |
288 | if (who) | |
289 | pgrp = find_vpid(who); | |
290 | else | |
291 | pgrp = task_pgrp(current); | |
292 | do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { | |
293 | niceval = nice_to_rlimit(task_nice(p)); | |
294 | if (niceval > retval) | |
295 | retval = niceval; | |
296 | } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); | |
297 | break; | |
298 | case PRIO_USER: | |
299 | uid = make_kuid(cred->user_ns, who); | |
300 | user = cred->user; | |
301 | if (!who) | |
302 | uid = cred->uid; | |
303 | else if (!uid_eq(uid, cred->uid)) { | |
304 | user = find_user(uid); | |
305 | if (!user) | |
306 | goto out_unlock; /* No processes for this user */ | |
307 | } | |
308 | do_each_thread(g, p) { | |
8639b461 | 309 | if (uid_eq(task_uid(p), uid) && task_pid_vnr(p)) { |
7aa2c016 | 310 | niceval = nice_to_rlimit(task_nice(p)); |
1da177e4 LT |
311 | if (niceval > retval) |
312 | retval = niceval; | |
313 | } | |
ec94fc3d | 314 | } while_each_thread(g, p); |
315 | if (!uid_eq(uid, cred->uid)) | |
316 | free_uid(user); /* for find_user() */ | |
317 | break; | |
1da177e4 LT |
318 | } |
319 | out_unlock: | |
320 | read_unlock(&tasklist_lock); | |
70118837 | 321 | rcu_read_unlock(); |
1da177e4 LT |
322 | |
323 | return retval; | |
324 | } | |
325 | ||
1da177e4 LT |
326 | /* |
327 | * Unprivileged users may change the real gid to the effective gid | |
328 | * or vice versa. (BSD-style) | |
329 | * | |
330 | * If you set the real gid at all, or set the effective gid to a value not | |
331 | * equal to the real gid, then the saved gid is set to the new effective gid. | |
332 | * | |
333 | * This makes it possible for a setgid program to completely drop its | |
334 | * privileges, which is often a useful assertion to make when you are doing | |
335 | * a security audit over a program. | |
336 | * | |
337 | * The general idea is that a program which uses just setregid() will be | |
338 | * 100% compatible with BSD. A program which uses just setgid() will be | |
ec94fc3d | 339 | * 100% compatible with POSIX with saved IDs. |
1da177e4 LT |
340 | * |
341 | * SMP: There are not races, the GIDs are checked only by filesystem | |
342 | * operations (as far as semantic preservation is concerned). | |
343 | */ | |
2813893f | 344 | #ifdef CONFIG_MULTIUSER |
ae1251ab | 345 | SYSCALL_DEFINE2(setregid, gid_t, rgid, gid_t, egid) |
1da177e4 | 346 | { |
a29c33f4 | 347 | struct user_namespace *ns = current_user_ns(); |
d84f4f99 DH |
348 | const struct cred *old; |
349 | struct cred *new; | |
1da177e4 | 350 | int retval; |
a29c33f4 EB |
351 | kgid_t krgid, kegid; |
352 | ||
353 | krgid = make_kgid(ns, rgid); | |
354 | kegid = make_kgid(ns, egid); | |
355 | ||
356 | if ((rgid != (gid_t) -1) && !gid_valid(krgid)) | |
357 | return -EINVAL; | |
358 | if ((egid != (gid_t) -1) && !gid_valid(kegid)) | |
359 | return -EINVAL; | |
1da177e4 | 360 | |
d84f4f99 DH |
361 | new = prepare_creds(); |
362 | if (!new) | |
363 | return -ENOMEM; | |
364 | old = current_cred(); | |
365 | ||
d84f4f99 | 366 | retval = -EPERM; |
1da177e4 | 367 | if (rgid != (gid_t) -1) { |
a29c33f4 EB |
368 | if (gid_eq(old->gid, krgid) || |
369 | gid_eq(old->egid, krgid) || | |
c7b96acf | 370 | ns_capable(old->user_ns, CAP_SETGID)) |
a29c33f4 | 371 | new->gid = krgid; |
1da177e4 | 372 | else |
d84f4f99 | 373 | goto error; |
1da177e4 LT |
374 | } |
375 | if (egid != (gid_t) -1) { | |
a29c33f4 EB |
376 | if (gid_eq(old->gid, kegid) || |
377 | gid_eq(old->egid, kegid) || | |
378 | gid_eq(old->sgid, kegid) || | |
c7b96acf | 379 | ns_capable(old->user_ns, CAP_SETGID)) |
a29c33f4 | 380 | new->egid = kegid; |
756184b7 | 381 | else |
d84f4f99 | 382 | goto error; |
1da177e4 | 383 | } |
d84f4f99 | 384 | |
1da177e4 | 385 | if (rgid != (gid_t) -1 || |
a29c33f4 | 386 | (egid != (gid_t) -1 && !gid_eq(kegid, old->gid))) |
d84f4f99 DH |
387 | new->sgid = new->egid; |
388 | new->fsgid = new->egid; | |
389 | ||
390 | return commit_creds(new); | |
391 | ||
392 | error: | |
393 | abort_creds(new); | |
394 | return retval; | |
1da177e4 LT |
395 | } |
396 | ||
397 | /* | |
ec94fc3d | 398 | * setgid() is implemented like SysV w/ SAVED_IDS |
1da177e4 LT |
399 | * |
400 | * SMP: Same implicit races as above. | |
401 | */ | |
ae1251ab | 402 | SYSCALL_DEFINE1(setgid, gid_t, gid) |
1da177e4 | 403 | { |
a29c33f4 | 404 | struct user_namespace *ns = current_user_ns(); |
d84f4f99 DH |
405 | const struct cred *old; |
406 | struct cred *new; | |
1da177e4 | 407 | int retval; |
a29c33f4 EB |
408 | kgid_t kgid; |
409 | ||
410 | kgid = make_kgid(ns, gid); | |
411 | if (!gid_valid(kgid)) | |
412 | return -EINVAL; | |
1da177e4 | 413 | |
d84f4f99 DH |
414 | new = prepare_creds(); |
415 | if (!new) | |
416 | return -ENOMEM; | |
417 | old = current_cred(); | |
418 | ||
d84f4f99 | 419 | retval = -EPERM; |
c7b96acf | 420 | if (ns_capable(old->user_ns, CAP_SETGID)) |
a29c33f4 EB |
421 | new->gid = new->egid = new->sgid = new->fsgid = kgid; |
422 | else if (gid_eq(kgid, old->gid) || gid_eq(kgid, old->sgid)) | |
423 | new->egid = new->fsgid = kgid; | |
1da177e4 | 424 | else |
d84f4f99 | 425 | goto error; |
1da177e4 | 426 | |
d84f4f99 DH |
427 | return commit_creds(new); |
428 | ||
429 | error: | |
430 | abort_creds(new); | |
431 | return retval; | |
1da177e4 | 432 | } |
54e99124 | 433 | |
d84f4f99 DH |
434 | /* |
435 | * change the user struct in a credentials set to match the new UID | |
436 | */ | |
437 | static int set_user(struct cred *new) | |
1da177e4 LT |
438 | { |
439 | struct user_struct *new_user; | |
440 | ||
078de5f7 | 441 | new_user = alloc_uid(new->uid); |
1da177e4 LT |
442 | if (!new_user) |
443 | return -EAGAIN; | |
444 | ||
72fa5997 VK |
445 | /* |
446 | * We don't fail in case of NPROC limit excess here because too many | |
447 | * poorly written programs don't check set*uid() return code, assuming | |
448 | * it never fails if called by root. We may still enforce NPROC limit | |
449 | * for programs doing set*uid()+execve() by harmlessly deferring the | |
450 | * failure to the execve() stage. | |
451 | */ | |
78d7d407 | 452 | if (atomic_read(&new_user->processes) >= rlimit(RLIMIT_NPROC) && |
72fa5997 VK |
453 | new_user != INIT_USER) |
454 | current->flags |= PF_NPROC_EXCEEDED; | |
455 | else | |
456 | current->flags &= ~PF_NPROC_EXCEEDED; | |
1da177e4 | 457 | |
d84f4f99 DH |
458 | free_uid(new->user); |
459 | new->user = new_user; | |
1da177e4 LT |
460 | return 0; |
461 | } | |
462 | ||
463 | /* | |
464 | * Unprivileged users may change the real uid to the effective uid | |
465 | * or vice versa. (BSD-style) | |
466 | * | |
467 | * If you set the real uid at all, or set the effective uid to a value not | |
468 | * equal to the real uid, then the saved uid is set to the new effective uid. | |
469 | * | |
470 | * This makes it possible for a setuid program to completely drop its | |
471 | * privileges, which is often a useful assertion to make when you are doing | |
472 | * a security audit over a program. | |
473 | * | |
474 | * The general idea is that a program which uses just setreuid() will be | |
475 | * 100% compatible with BSD. A program which uses just setuid() will be | |
ec94fc3d | 476 | * 100% compatible with POSIX with saved IDs. |
1da177e4 | 477 | */ |
ae1251ab | 478 | SYSCALL_DEFINE2(setreuid, uid_t, ruid, uid_t, euid) |
1da177e4 | 479 | { |
a29c33f4 | 480 | struct user_namespace *ns = current_user_ns(); |
d84f4f99 DH |
481 | const struct cred *old; |
482 | struct cred *new; | |
1da177e4 | 483 | int retval; |
a29c33f4 EB |
484 | kuid_t kruid, keuid; |
485 | ||
486 | kruid = make_kuid(ns, ruid); | |
487 | keuid = make_kuid(ns, euid); | |
488 | ||
489 | if ((ruid != (uid_t) -1) && !uid_valid(kruid)) | |
490 | return -EINVAL; | |
491 | if ((euid != (uid_t) -1) && !uid_valid(keuid)) | |
492 | return -EINVAL; | |
1da177e4 | 493 | |
d84f4f99 DH |
494 | new = prepare_creds(); |
495 | if (!new) | |
496 | return -ENOMEM; | |
497 | old = current_cred(); | |
498 | ||
d84f4f99 | 499 | retval = -EPERM; |
1da177e4 | 500 | if (ruid != (uid_t) -1) { |
a29c33f4 EB |
501 | new->uid = kruid; |
502 | if (!uid_eq(old->uid, kruid) && | |
503 | !uid_eq(old->euid, kruid) && | |
c7b96acf | 504 | !ns_capable(old->user_ns, CAP_SETUID)) |
d84f4f99 | 505 | goto error; |
1da177e4 LT |
506 | } |
507 | ||
508 | if (euid != (uid_t) -1) { | |
a29c33f4 EB |
509 | new->euid = keuid; |
510 | if (!uid_eq(old->uid, keuid) && | |
511 | !uid_eq(old->euid, keuid) && | |
512 | !uid_eq(old->suid, keuid) && | |
c7b96acf | 513 | !ns_capable(old->user_ns, CAP_SETUID)) |
d84f4f99 | 514 | goto error; |
1da177e4 LT |
515 | } |
516 | ||
a29c33f4 | 517 | if (!uid_eq(new->uid, old->uid)) { |
54e99124 DG |
518 | retval = set_user(new); |
519 | if (retval < 0) | |
520 | goto error; | |
521 | } | |
1da177e4 | 522 | if (ruid != (uid_t) -1 || |
a29c33f4 | 523 | (euid != (uid_t) -1 && !uid_eq(keuid, old->uid))) |
d84f4f99 DH |
524 | new->suid = new->euid; |
525 | new->fsuid = new->euid; | |
1da177e4 | 526 | |
d84f4f99 DH |
527 | retval = security_task_fix_setuid(new, old, LSM_SETID_RE); |
528 | if (retval < 0) | |
529 | goto error; | |
1da177e4 | 530 | |
d84f4f99 | 531 | return commit_creds(new); |
1da177e4 | 532 | |
d84f4f99 DH |
533 | error: |
534 | abort_creds(new); | |
535 | return retval; | |
536 | } | |
ec94fc3d | 537 | |
1da177e4 | 538 | /* |
ec94fc3d | 539 | * setuid() is implemented like SysV with SAVED_IDS |
540 | * | |
1da177e4 | 541 | * Note that SAVED_ID's is deficient in that a setuid root program |
ec94fc3d | 542 | * like sendmail, for example, cannot set its uid to be a normal |
1da177e4 LT |
543 | * user and then switch back, because if you're root, setuid() sets |
544 | * the saved uid too. If you don't like this, blame the bright people | |
545 | * in the POSIX committee and/or USG. Note that the BSD-style setreuid() | |
546 | * will allow a root program to temporarily drop privileges and be able to | |
ec94fc3d | 547 | * regain them by swapping the real and effective uid. |
1da177e4 | 548 | */ |
ae1251ab | 549 | SYSCALL_DEFINE1(setuid, uid_t, uid) |
1da177e4 | 550 | { |
a29c33f4 | 551 | struct user_namespace *ns = current_user_ns(); |
d84f4f99 DH |
552 | const struct cred *old; |
553 | struct cred *new; | |
1da177e4 | 554 | int retval; |
a29c33f4 EB |
555 | kuid_t kuid; |
556 | ||
557 | kuid = make_kuid(ns, uid); | |
558 | if (!uid_valid(kuid)) | |
559 | return -EINVAL; | |
1da177e4 | 560 | |
d84f4f99 DH |
561 | new = prepare_creds(); |
562 | if (!new) | |
563 | return -ENOMEM; | |
564 | old = current_cred(); | |
565 | ||
d84f4f99 | 566 | retval = -EPERM; |
c7b96acf | 567 | if (ns_capable(old->user_ns, CAP_SETUID)) { |
a29c33f4 EB |
568 | new->suid = new->uid = kuid; |
569 | if (!uid_eq(kuid, old->uid)) { | |
54e99124 DG |
570 | retval = set_user(new); |
571 | if (retval < 0) | |
572 | goto error; | |
d84f4f99 | 573 | } |
a29c33f4 | 574 | } else if (!uid_eq(kuid, old->uid) && !uid_eq(kuid, new->suid)) { |
d84f4f99 | 575 | goto error; |
1da177e4 | 576 | } |
1da177e4 | 577 | |
a29c33f4 | 578 | new->fsuid = new->euid = kuid; |
d84f4f99 DH |
579 | |
580 | retval = security_task_fix_setuid(new, old, LSM_SETID_ID); | |
581 | if (retval < 0) | |
582 | goto error; | |
1da177e4 | 583 | |
d84f4f99 | 584 | return commit_creds(new); |
1da177e4 | 585 | |
d84f4f99 DH |
586 | error: |
587 | abort_creds(new); | |
588 | return retval; | |
1da177e4 LT |
589 | } |
590 | ||
591 | ||
592 | /* | |
593 | * This function implements a generic ability to update ruid, euid, | |
594 | * and suid. This allows you to implement the 4.4 compatible seteuid(). | |
595 | */ | |
ae1251ab | 596 | SYSCALL_DEFINE3(setresuid, uid_t, ruid, uid_t, euid, uid_t, suid) |
1da177e4 | 597 | { |
a29c33f4 | 598 | struct user_namespace *ns = current_user_ns(); |
d84f4f99 DH |
599 | const struct cred *old; |
600 | struct cred *new; | |
1da177e4 | 601 | int retval; |
a29c33f4 EB |
602 | kuid_t kruid, keuid, ksuid; |
603 | ||
604 | kruid = make_kuid(ns, ruid); | |
605 | keuid = make_kuid(ns, euid); | |
606 | ksuid = make_kuid(ns, suid); | |
607 | ||
608 | if ((ruid != (uid_t) -1) && !uid_valid(kruid)) | |
609 | return -EINVAL; | |
610 | ||
611 | if ((euid != (uid_t) -1) && !uid_valid(keuid)) | |
612 | return -EINVAL; | |
613 | ||
614 | if ((suid != (uid_t) -1) && !uid_valid(ksuid)) | |
615 | return -EINVAL; | |
1da177e4 | 616 | |
d84f4f99 DH |
617 | new = prepare_creds(); |
618 | if (!new) | |
619 | return -ENOMEM; | |
620 | ||
d84f4f99 | 621 | old = current_cred(); |
1da177e4 | 622 | |
d84f4f99 | 623 | retval = -EPERM; |
c7b96acf | 624 | if (!ns_capable(old->user_ns, CAP_SETUID)) { |
a29c33f4 EB |
625 | if (ruid != (uid_t) -1 && !uid_eq(kruid, old->uid) && |
626 | !uid_eq(kruid, old->euid) && !uid_eq(kruid, old->suid)) | |
d84f4f99 | 627 | goto error; |
a29c33f4 EB |
628 | if (euid != (uid_t) -1 && !uid_eq(keuid, old->uid) && |
629 | !uid_eq(keuid, old->euid) && !uid_eq(keuid, old->suid)) | |
d84f4f99 | 630 | goto error; |
a29c33f4 EB |
631 | if (suid != (uid_t) -1 && !uid_eq(ksuid, old->uid) && |
632 | !uid_eq(ksuid, old->euid) && !uid_eq(ksuid, old->suid)) | |
d84f4f99 | 633 | goto error; |
1da177e4 | 634 | } |
d84f4f99 | 635 | |
1da177e4 | 636 | if (ruid != (uid_t) -1) { |
a29c33f4 EB |
637 | new->uid = kruid; |
638 | if (!uid_eq(kruid, old->uid)) { | |
54e99124 DG |
639 | retval = set_user(new); |
640 | if (retval < 0) | |
641 | goto error; | |
642 | } | |
1da177e4 | 643 | } |
d84f4f99 | 644 | if (euid != (uid_t) -1) |
a29c33f4 | 645 | new->euid = keuid; |
1da177e4 | 646 | if (suid != (uid_t) -1) |
a29c33f4 | 647 | new->suid = ksuid; |
d84f4f99 | 648 | new->fsuid = new->euid; |
1da177e4 | 649 | |
d84f4f99 DH |
650 | retval = security_task_fix_setuid(new, old, LSM_SETID_RES); |
651 | if (retval < 0) | |
652 | goto error; | |
1da177e4 | 653 | |
d84f4f99 | 654 | return commit_creds(new); |
1da177e4 | 655 | |
d84f4f99 DH |
656 | error: |
657 | abort_creds(new); | |
658 | return retval; | |
1da177e4 LT |
659 | } |
660 | ||
a29c33f4 | 661 | SYSCALL_DEFINE3(getresuid, uid_t __user *, ruidp, uid_t __user *, euidp, uid_t __user *, suidp) |
1da177e4 | 662 | { |
86a264ab | 663 | const struct cred *cred = current_cred(); |
1da177e4 | 664 | int retval; |
a29c33f4 EB |
665 | uid_t ruid, euid, suid; |
666 | ||
667 | ruid = from_kuid_munged(cred->user_ns, cred->uid); | |
668 | euid = from_kuid_munged(cred->user_ns, cred->euid); | |
669 | suid = from_kuid_munged(cred->user_ns, cred->suid); | |
1da177e4 | 670 | |
ec94fc3d | 671 | retval = put_user(ruid, ruidp); |
672 | if (!retval) { | |
673 | retval = put_user(euid, euidp); | |
674 | if (!retval) | |
675 | return put_user(suid, suidp); | |
676 | } | |
1da177e4 LT |
677 | return retval; |
678 | } | |
679 | ||
680 | /* | |
681 | * Same as above, but for rgid, egid, sgid. | |
682 | */ | |
ae1251ab | 683 | SYSCALL_DEFINE3(setresgid, gid_t, rgid, gid_t, egid, gid_t, sgid) |
1da177e4 | 684 | { |
a29c33f4 | 685 | struct user_namespace *ns = current_user_ns(); |
d84f4f99 DH |
686 | const struct cred *old; |
687 | struct cred *new; | |
1da177e4 | 688 | int retval; |
a29c33f4 EB |
689 | kgid_t krgid, kegid, ksgid; |
690 | ||
691 | krgid = make_kgid(ns, rgid); | |
692 | kegid = make_kgid(ns, egid); | |
693 | ksgid = make_kgid(ns, sgid); | |
694 | ||
695 | if ((rgid != (gid_t) -1) && !gid_valid(krgid)) | |
696 | return -EINVAL; | |
697 | if ((egid != (gid_t) -1) && !gid_valid(kegid)) | |
698 | return -EINVAL; | |
699 | if ((sgid != (gid_t) -1) && !gid_valid(ksgid)) | |
700 | return -EINVAL; | |
1da177e4 | 701 | |
d84f4f99 DH |
702 | new = prepare_creds(); |
703 | if (!new) | |
704 | return -ENOMEM; | |
705 | old = current_cred(); | |
706 | ||
d84f4f99 | 707 | retval = -EPERM; |
c7b96acf | 708 | if (!ns_capable(old->user_ns, CAP_SETGID)) { |
a29c33f4 EB |
709 | if (rgid != (gid_t) -1 && !gid_eq(krgid, old->gid) && |
710 | !gid_eq(krgid, old->egid) && !gid_eq(krgid, old->sgid)) | |
d84f4f99 | 711 | goto error; |
a29c33f4 EB |
712 | if (egid != (gid_t) -1 && !gid_eq(kegid, old->gid) && |
713 | !gid_eq(kegid, old->egid) && !gid_eq(kegid, old->sgid)) | |
d84f4f99 | 714 | goto error; |
a29c33f4 EB |
715 | if (sgid != (gid_t) -1 && !gid_eq(ksgid, old->gid) && |
716 | !gid_eq(ksgid, old->egid) && !gid_eq(ksgid, old->sgid)) | |
d84f4f99 | 717 | goto error; |
1da177e4 | 718 | } |
d84f4f99 | 719 | |
1da177e4 | 720 | if (rgid != (gid_t) -1) |
a29c33f4 | 721 | new->gid = krgid; |
d84f4f99 | 722 | if (egid != (gid_t) -1) |
a29c33f4 | 723 | new->egid = kegid; |
1da177e4 | 724 | if (sgid != (gid_t) -1) |
a29c33f4 | 725 | new->sgid = ksgid; |
d84f4f99 | 726 | new->fsgid = new->egid; |
1da177e4 | 727 | |
d84f4f99 DH |
728 | return commit_creds(new); |
729 | ||
730 | error: | |
731 | abort_creds(new); | |
732 | return retval; | |
1da177e4 LT |
733 | } |
734 | ||
a29c33f4 | 735 | SYSCALL_DEFINE3(getresgid, gid_t __user *, rgidp, gid_t __user *, egidp, gid_t __user *, sgidp) |
1da177e4 | 736 | { |
86a264ab | 737 | const struct cred *cred = current_cred(); |
1da177e4 | 738 | int retval; |
a29c33f4 EB |
739 | gid_t rgid, egid, sgid; |
740 | ||
741 | rgid = from_kgid_munged(cred->user_ns, cred->gid); | |
742 | egid = from_kgid_munged(cred->user_ns, cred->egid); | |
743 | sgid = from_kgid_munged(cred->user_ns, cred->sgid); | |
1da177e4 | 744 | |
ec94fc3d | 745 | retval = put_user(rgid, rgidp); |
746 | if (!retval) { | |
747 | retval = put_user(egid, egidp); | |
748 | if (!retval) | |
749 | retval = put_user(sgid, sgidp); | |
750 | } | |
1da177e4 LT |
751 | |
752 | return retval; | |
753 | } | |
754 | ||
755 | ||
756 | /* | |
757 | * "setfsuid()" sets the fsuid - the uid used for filesystem checks. This | |
758 | * is used for "access()" and for the NFS daemon (letting nfsd stay at | |
759 | * whatever uid it wants to). It normally shadows "euid", except when | |
760 | * explicitly set by setfsuid() or for access.. | |
761 | */ | |
ae1251ab | 762 | SYSCALL_DEFINE1(setfsuid, uid_t, uid) |
1da177e4 | 763 | { |
d84f4f99 DH |
764 | const struct cred *old; |
765 | struct cred *new; | |
766 | uid_t old_fsuid; | |
a29c33f4 EB |
767 | kuid_t kuid; |
768 | ||
769 | old = current_cred(); | |
770 | old_fsuid = from_kuid_munged(old->user_ns, old->fsuid); | |
771 | ||
772 | kuid = make_kuid(old->user_ns, uid); | |
773 | if (!uid_valid(kuid)) | |
774 | return old_fsuid; | |
1da177e4 | 775 | |
d84f4f99 DH |
776 | new = prepare_creds(); |
777 | if (!new) | |
a29c33f4 | 778 | return old_fsuid; |
1da177e4 | 779 | |
a29c33f4 EB |
780 | if (uid_eq(kuid, old->uid) || uid_eq(kuid, old->euid) || |
781 | uid_eq(kuid, old->suid) || uid_eq(kuid, old->fsuid) || | |
c7b96acf | 782 | ns_capable(old->user_ns, CAP_SETUID)) { |
a29c33f4 EB |
783 | if (!uid_eq(kuid, old->fsuid)) { |
784 | new->fsuid = kuid; | |
d84f4f99 DH |
785 | if (security_task_fix_setuid(new, old, LSM_SETID_FS) == 0) |
786 | goto change_okay; | |
1da177e4 | 787 | } |
1da177e4 LT |
788 | } |
789 | ||
d84f4f99 DH |
790 | abort_creds(new); |
791 | return old_fsuid; | |
1da177e4 | 792 | |
d84f4f99 DH |
793 | change_okay: |
794 | commit_creds(new); | |
1da177e4 LT |
795 | return old_fsuid; |
796 | } | |
797 | ||
798 | /* | |
f42df9e6 | 799 | * Samma på svenska.. |
1da177e4 | 800 | */ |
ae1251ab | 801 | SYSCALL_DEFINE1(setfsgid, gid_t, gid) |
1da177e4 | 802 | { |
d84f4f99 DH |
803 | const struct cred *old; |
804 | struct cred *new; | |
805 | gid_t old_fsgid; | |
a29c33f4 EB |
806 | kgid_t kgid; |
807 | ||
808 | old = current_cred(); | |
809 | old_fsgid = from_kgid_munged(old->user_ns, old->fsgid); | |
810 | ||
811 | kgid = make_kgid(old->user_ns, gid); | |
812 | if (!gid_valid(kgid)) | |
813 | return old_fsgid; | |
d84f4f99 DH |
814 | |
815 | new = prepare_creds(); | |
816 | if (!new) | |
a29c33f4 | 817 | return old_fsgid; |
1da177e4 | 818 | |
a29c33f4 EB |
819 | if (gid_eq(kgid, old->gid) || gid_eq(kgid, old->egid) || |
820 | gid_eq(kgid, old->sgid) || gid_eq(kgid, old->fsgid) || | |
c7b96acf | 821 | ns_capable(old->user_ns, CAP_SETGID)) { |
a29c33f4 EB |
822 | if (!gid_eq(kgid, old->fsgid)) { |
823 | new->fsgid = kgid; | |
d84f4f99 | 824 | goto change_okay; |
1da177e4 | 825 | } |
1da177e4 | 826 | } |
d84f4f99 | 827 | |
d84f4f99 DH |
828 | abort_creds(new); |
829 | return old_fsgid; | |
830 | ||
831 | change_okay: | |
832 | commit_creds(new); | |
1da177e4 LT |
833 | return old_fsgid; |
834 | } | |
2813893f | 835 | #endif /* CONFIG_MULTIUSER */ |
1da177e4 | 836 | |
4a22f166 SR |
837 | /** |
838 | * sys_getpid - return the thread group id of the current process | |
839 | * | |
840 | * Note, despite the name, this returns the tgid not the pid. The tgid and | |
841 | * the pid are identical unless CLONE_THREAD was specified on clone() in | |
842 | * which case the tgid is the same in all threads of the same group. | |
843 | * | |
844 | * This is SMP safe as current->tgid does not change. | |
845 | */ | |
846 | SYSCALL_DEFINE0(getpid) | |
847 | { | |
848 | return task_tgid_vnr(current); | |
849 | } | |
850 | ||
851 | /* Thread ID - the internal kernel "pid" */ | |
852 | SYSCALL_DEFINE0(gettid) | |
853 | { | |
854 | return task_pid_vnr(current); | |
855 | } | |
856 | ||
857 | /* | |
858 | * Accessing ->real_parent is not SMP-safe, it could | |
859 | * change from under us. However, we can use a stale | |
860 | * value of ->real_parent under rcu_read_lock(), see | |
861 | * release_task()->call_rcu(delayed_put_task_struct). | |
862 | */ | |
863 | SYSCALL_DEFINE0(getppid) | |
864 | { | |
865 | int pid; | |
866 | ||
867 | rcu_read_lock(); | |
868 | pid = task_tgid_vnr(rcu_dereference(current->real_parent)); | |
869 | rcu_read_unlock(); | |
870 | ||
871 | return pid; | |
872 | } | |
873 | ||
874 | SYSCALL_DEFINE0(getuid) | |
875 | { | |
876 | /* Only we change this so SMP safe */ | |
877 | return from_kuid_munged(current_user_ns(), current_uid()); | |
878 | } | |
879 | ||
880 | SYSCALL_DEFINE0(geteuid) | |
881 | { | |
882 | /* Only we change this so SMP safe */ | |
883 | return from_kuid_munged(current_user_ns(), current_euid()); | |
884 | } | |
885 | ||
886 | SYSCALL_DEFINE0(getgid) | |
887 | { | |
888 | /* Only we change this so SMP safe */ | |
889 | return from_kgid_munged(current_user_ns(), current_gid()); | |
890 | } | |
891 | ||
892 | SYSCALL_DEFINE0(getegid) | |
893 | { | |
894 | /* Only we change this so SMP safe */ | |
895 | return from_kgid_munged(current_user_ns(), current_egid()); | |
896 | } | |
897 | ||
ca2406ed | 898 | static void do_sys_times(struct tms *tms) |
f06febc9 | 899 | { |
5613fda9 | 900 | u64 tgutime, tgstime, cutime, cstime; |
f06febc9 | 901 | |
e80d0a1a | 902 | thread_group_cputime_adjusted(current, &tgutime, &tgstime); |
f06febc9 FM |
903 | cutime = current->signal->cutime; |
904 | cstime = current->signal->cstime; | |
5613fda9 FW |
905 | tms->tms_utime = nsec_to_clock_t(tgutime); |
906 | tms->tms_stime = nsec_to_clock_t(tgstime); | |
907 | tms->tms_cutime = nsec_to_clock_t(cutime); | |
908 | tms->tms_cstime = nsec_to_clock_t(cstime); | |
f06febc9 FM |
909 | } |
910 | ||
58fd3aa2 | 911 | SYSCALL_DEFINE1(times, struct tms __user *, tbuf) |
1da177e4 | 912 | { |
1da177e4 LT |
913 | if (tbuf) { |
914 | struct tms tmp; | |
f06febc9 FM |
915 | |
916 | do_sys_times(&tmp); | |
1da177e4 LT |
917 | if (copy_to_user(tbuf, &tmp, sizeof(struct tms))) |
918 | return -EFAULT; | |
919 | } | |
e3d5a27d | 920 | force_successful_syscall_return(); |
1da177e4 LT |
921 | return (long) jiffies_64_to_clock_t(get_jiffies_64()); |
922 | } | |
923 | ||
ca2406ed AV |
924 | #ifdef CONFIG_COMPAT |
925 | static compat_clock_t clock_t_to_compat_clock_t(clock_t x) | |
926 | { | |
927 | return compat_jiffies_to_clock_t(clock_t_to_jiffies(x)); | |
928 | } | |
929 | ||
930 | COMPAT_SYSCALL_DEFINE1(times, struct compat_tms __user *, tbuf) | |
931 | { | |
932 | if (tbuf) { | |
933 | struct tms tms; | |
934 | struct compat_tms tmp; | |
935 | ||
936 | do_sys_times(&tms); | |
937 | /* Convert our struct tms to the compat version. */ | |
938 | tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime); | |
939 | tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime); | |
940 | tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime); | |
941 | tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime); | |
942 | if (copy_to_user(tbuf, &tmp, sizeof(tmp))) | |
943 | return -EFAULT; | |
944 | } | |
945 | force_successful_syscall_return(); | |
946 | return compat_jiffies_to_clock_t(jiffies); | |
947 | } | |
948 | #endif | |
949 | ||
1da177e4 LT |
950 | /* |
951 | * This needs some heavy checking ... | |
952 | * I just haven't the stomach for it. I also don't fully | |
953 | * understand sessions/pgrp etc. Let somebody who does explain it. | |
954 | * | |
955 | * OK, I think I have the protection semantics right.... this is really | |
956 | * only important on a multi-user system anyway, to make sure one user | |
957 | * can't send a signal to a process owned by another. -TYT, 12/12/91 | |
958 | * | |
98611e4e | 959 | * !PF_FORKNOEXEC check to conform completely to POSIX. |
1da177e4 | 960 | */ |
b290ebe2 | 961 | SYSCALL_DEFINE2(setpgid, pid_t, pid, pid_t, pgid) |
1da177e4 LT |
962 | { |
963 | struct task_struct *p; | |
ee0acf90 | 964 | struct task_struct *group_leader = current->group_leader; |
4e021306 ON |
965 | struct pid *pgrp; |
966 | int err; | |
1da177e4 LT |
967 | |
968 | if (!pid) | |
b488893a | 969 | pid = task_pid_vnr(group_leader); |
1da177e4 LT |
970 | if (!pgid) |
971 | pgid = pid; | |
972 | if (pgid < 0) | |
973 | return -EINVAL; | |
950eaaca | 974 | rcu_read_lock(); |
1da177e4 LT |
975 | |
976 | /* From this point forward we keep holding onto the tasklist lock | |
977 | * so that our parent does not change from under us. -DaveM | |
978 | */ | |
979 | write_lock_irq(&tasklist_lock); | |
980 | ||
981 | err = -ESRCH; | |
4e021306 | 982 | p = find_task_by_vpid(pid); |
1da177e4 LT |
983 | if (!p) |
984 | goto out; | |
985 | ||
986 | err = -EINVAL; | |
987 | if (!thread_group_leader(p)) | |
988 | goto out; | |
989 | ||
4e021306 | 990 | if (same_thread_group(p->real_parent, group_leader)) { |
1da177e4 | 991 | err = -EPERM; |
41487c65 | 992 | if (task_session(p) != task_session(group_leader)) |
1da177e4 LT |
993 | goto out; |
994 | err = -EACCES; | |
98611e4e | 995 | if (!(p->flags & PF_FORKNOEXEC)) |
1da177e4 LT |
996 | goto out; |
997 | } else { | |
998 | err = -ESRCH; | |
ee0acf90 | 999 | if (p != group_leader) |
1da177e4 LT |
1000 | goto out; |
1001 | } | |
1002 | ||
1003 | err = -EPERM; | |
1004 | if (p->signal->leader) | |
1005 | goto out; | |
1006 | ||
4e021306 | 1007 | pgrp = task_pid(p); |
1da177e4 | 1008 | if (pgid != pid) { |
b488893a | 1009 | struct task_struct *g; |
1da177e4 | 1010 | |
4e021306 ON |
1011 | pgrp = find_vpid(pgid); |
1012 | g = pid_task(pgrp, PIDTYPE_PGID); | |
41487c65 | 1013 | if (!g || task_session(g) != task_session(group_leader)) |
f020bc46 | 1014 | goto out; |
1da177e4 LT |
1015 | } |
1016 | ||
1da177e4 LT |
1017 | err = security_task_setpgid(p, pgid); |
1018 | if (err) | |
1019 | goto out; | |
1020 | ||
1b0f7ffd | 1021 | if (task_pgrp(p) != pgrp) |
83beaf3c | 1022 | change_pid(p, PIDTYPE_PGID, pgrp); |
1da177e4 LT |
1023 | |
1024 | err = 0; | |
1025 | out: | |
1026 | /* All paths lead to here, thus we are safe. -DaveM */ | |
1027 | write_unlock_irq(&tasklist_lock); | |
950eaaca | 1028 | rcu_read_unlock(); |
1da177e4 LT |
1029 | return err; |
1030 | } | |
1031 | ||
dbf040d9 | 1032 | SYSCALL_DEFINE1(getpgid, pid_t, pid) |
1da177e4 | 1033 | { |
12a3de0a ON |
1034 | struct task_struct *p; |
1035 | struct pid *grp; | |
1036 | int retval; | |
1037 | ||
1038 | rcu_read_lock(); | |
756184b7 | 1039 | if (!pid) |
12a3de0a | 1040 | grp = task_pgrp(current); |
756184b7 | 1041 | else { |
1da177e4 | 1042 | retval = -ESRCH; |
12a3de0a ON |
1043 | p = find_task_by_vpid(pid); |
1044 | if (!p) | |
1045 | goto out; | |
1046 | grp = task_pgrp(p); | |
1047 | if (!grp) | |
1048 | goto out; | |
1049 | ||
1050 | retval = security_task_getpgid(p); | |
1051 | if (retval) | |
1052 | goto out; | |
1da177e4 | 1053 | } |
12a3de0a ON |
1054 | retval = pid_vnr(grp); |
1055 | out: | |
1056 | rcu_read_unlock(); | |
1057 | return retval; | |
1da177e4 LT |
1058 | } |
1059 | ||
1060 | #ifdef __ARCH_WANT_SYS_GETPGRP | |
1061 | ||
dbf040d9 | 1062 | SYSCALL_DEFINE0(getpgrp) |
1da177e4 | 1063 | { |
12a3de0a | 1064 | return sys_getpgid(0); |
1da177e4 LT |
1065 | } |
1066 | ||
1067 | #endif | |
1068 | ||
dbf040d9 | 1069 | SYSCALL_DEFINE1(getsid, pid_t, pid) |
1da177e4 | 1070 | { |
1dd768c0 ON |
1071 | struct task_struct *p; |
1072 | struct pid *sid; | |
1073 | int retval; | |
1074 | ||
1075 | rcu_read_lock(); | |
756184b7 | 1076 | if (!pid) |
1dd768c0 | 1077 | sid = task_session(current); |
756184b7 | 1078 | else { |
1da177e4 | 1079 | retval = -ESRCH; |
1dd768c0 ON |
1080 | p = find_task_by_vpid(pid); |
1081 | if (!p) | |
1082 | goto out; | |
1083 | sid = task_session(p); | |
1084 | if (!sid) | |
1085 | goto out; | |
1086 | ||
1087 | retval = security_task_getsid(p); | |
1088 | if (retval) | |
1089 | goto out; | |
1da177e4 | 1090 | } |
1dd768c0 ON |
1091 | retval = pid_vnr(sid); |
1092 | out: | |
1093 | rcu_read_unlock(); | |
1094 | return retval; | |
1da177e4 LT |
1095 | } |
1096 | ||
81dabb46 ON |
1097 | static void set_special_pids(struct pid *pid) |
1098 | { | |
1099 | struct task_struct *curr = current->group_leader; | |
1100 | ||
1101 | if (task_session(curr) != pid) | |
1102 | change_pid(curr, PIDTYPE_SID, pid); | |
1103 | ||
1104 | if (task_pgrp(curr) != pid) | |
1105 | change_pid(curr, PIDTYPE_PGID, pid); | |
1106 | } | |
1107 | ||
b290ebe2 | 1108 | SYSCALL_DEFINE0(setsid) |
1da177e4 | 1109 | { |
e19f247a | 1110 | struct task_struct *group_leader = current->group_leader; |
e4cc0a9c ON |
1111 | struct pid *sid = task_pid(group_leader); |
1112 | pid_t session = pid_vnr(sid); | |
1da177e4 LT |
1113 | int err = -EPERM; |
1114 | ||
1da177e4 | 1115 | write_lock_irq(&tasklist_lock); |
390e2ff0 EB |
1116 | /* Fail if I am already a session leader */ |
1117 | if (group_leader->signal->leader) | |
1118 | goto out; | |
1119 | ||
430c6231 ON |
1120 | /* Fail if a process group id already exists that equals the |
1121 | * proposed session id. | |
390e2ff0 | 1122 | */ |
6806aac6 | 1123 | if (pid_task(sid, PIDTYPE_PGID)) |
1da177e4 LT |
1124 | goto out; |
1125 | ||
e19f247a | 1126 | group_leader->signal->leader = 1; |
81dabb46 | 1127 | set_special_pids(sid); |
24ec839c | 1128 | |
9c9f4ded | 1129 | proc_clear_tty(group_leader); |
24ec839c | 1130 | |
e4cc0a9c | 1131 | err = session; |
1da177e4 LT |
1132 | out: |
1133 | write_unlock_irq(&tasklist_lock); | |
5091faa4 | 1134 | if (err > 0) { |
0d0df599 | 1135 | proc_sid_connector(group_leader); |
5091faa4 MG |
1136 | sched_autogroup_create_attach(group_leader); |
1137 | } | |
1da177e4 LT |
1138 | return err; |
1139 | } | |
1140 | ||
1da177e4 LT |
1141 | DECLARE_RWSEM(uts_sem); |
1142 | ||
66ddb73c AW |
1143 | #ifdef COMPAT_UTS_MACHINE |
1144 | static char compat_uts_machine[__OLD_UTS_LEN+1] = COMPAT_UTS_MACHINE; | |
1145 | ||
1146 | static int __init parse_compat_uts_machine(char *arg) | |
1147 | { | |
1148 | strncpy(compat_uts_machine, arg, __OLD_UTS_LEN); | |
1149 | compat_uts_machine[__OLD_UTS_LEN] = 0; | |
1150 | return 0; | |
1151 | } | |
1152 | early_param("compat_uts_machine", parse_compat_uts_machine); | |
1153 | ||
1154 | #undef COMPAT_UTS_MACHINE | |
1155 | #define COMPAT_UTS_MACHINE compat_uts_machine | |
1156 | #endif | |
1157 | ||
e28cbf22 CH |
1158 | #ifdef COMPAT_UTS_MACHINE |
1159 | #define override_architecture(name) \ | |
46da2766 | 1160 | (personality(current->personality) == PER_LINUX32 && \ |
e28cbf22 CH |
1161 | copy_to_user(name->machine, COMPAT_UTS_MACHINE, \ |
1162 | sizeof(COMPAT_UTS_MACHINE))) | |
1163 | #else | |
1164 | #define override_architecture(name) 0 | |
1165 | #endif | |
1166 | ||
be27425d AK |
1167 | /* |
1168 | * Work around broken programs that cannot handle "Linux 3.0". | |
1169 | * Instead we map 3.x to 2.6.40+x, so e.g. 3.0 would be 2.6.40 | |
39afb5ee | 1170 | * And we map 4.x to 2.6.60+x, so 4.0 would be 2.6.60. |
be27425d | 1171 | */ |
2702b152 | 1172 | static int override_release(char __user *release, size_t len) |
be27425d AK |
1173 | { |
1174 | int ret = 0; | |
be27425d AK |
1175 | |
1176 | if (current->personality & UNAME26) { | |
2702b152 KC |
1177 | const char *rest = UTS_RELEASE; |
1178 | char buf[65] = { 0 }; | |
be27425d AK |
1179 | int ndots = 0; |
1180 | unsigned v; | |
2702b152 | 1181 | size_t copy; |
be27425d AK |
1182 | |
1183 | while (*rest) { | |
1184 | if (*rest == '.' && ++ndots >= 3) | |
1185 | break; | |
1186 | if (!isdigit(*rest) && *rest != '.') | |
1187 | break; | |
1188 | rest++; | |
1189 | } | |
39afb5ee | 1190 | v = ((LINUX_VERSION_CODE >> 8) & 0xff) + 60; |
31fd84b9 | 1191 | copy = clamp_t(size_t, len, 1, sizeof(buf)); |
2702b152 KC |
1192 | copy = scnprintf(buf, copy, "2.6.%u%s", v, rest); |
1193 | ret = copy_to_user(release, buf, copy + 1); | |
be27425d AK |
1194 | } |
1195 | return ret; | |
1196 | } | |
1197 | ||
e48fbb69 | 1198 | SYSCALL_DEFINE1(newuname, struct new_utsname __user *, name) |
1da177e4 | 1199 | { |
ef0c8338 | 1200 | struct new_utsname tmp; |
1da177e4 LT |
1201 | |
1202 | down_read(&uts_sem); | |
ef0c8338 | 1203 | memcpy(&tmp, utsname(), sizeof(tmp)); |
1da177e4 | 1204 | up_read(&uts_sem); |
ef0c8338 JH |
1205 | if (copy_to_user(name, &tmp, sizeof(tmp))) |
1206 | return -EFAULT; | |
e28cbf22 | 1207 | |
ef0c8338 JH |
1208 | if (override_release(name->release, sizeof(name->release))) |
1209 | return -EFAULT; | |
1210 | if (override_architecture(name)) | |
1211 | return -EFAULT; | |
1212 | return 0; | |
1da177e4 LT |
1213 | } |
1214 | ||
5cacdb4a CH |
1215 | #ifdef __ARCH_WANT_SYS_OLD_UNAME |
1216 | /* | |
1217 | * Old cruft | |
1218 | */ | |
1219 | SYSCALL_DEFINE1(uname, struct old_utsname __user *, name) | |
1220 | { | |
ef0c8338 | 1221 | struct old_utsname tmp; |
5cacdb4a CH |
1222 | |
1223 | if (!name) | |
1224 | return -EFAULT; | |
1225 | ||
1226 | down_read(&uts_sem); | |
ef0c8338 | 1227 | memcpy(&tmp, utsname(), sizeof(tmp)); |
5cacdb4a | 1228 | up_read(&uts_sem); |
ef0c8338 JH |
1229 | if (copy_to_user(name, &tmp, sizeof(tmp))) |
1230 | return -EFAULT; | |
5cacdb4a | 1231 | |
ef0c8338 JH |
1232 | if (override_release(name->release, sizeof(name->release))) |
1233 | return -EFAULT; | |
1234 | if (override_architecture(name)) | |
1235 | return -EFAULT; | |
1236 | return 0; | |
5cacdb4a CH |
1237 | } |
1238 | ||
1239 | SYSCALL_DEFINE1(olduname, struct oldold_utsname __user *, name) | |
1240 | { | |
ef0c8338 | 1241 | struct oldold_utsname tmp = {}; |
5cacdb4a CH |
1242 | |
1243 | if (!name) | |
1244 | return -EFAULT; | |
5cacdb4a CH |
1245 | |
1246 | down_read(&uts_sem); | |
ef0c8338 JH |
1247 | memcpy(&tmp.sysname, &utsname()->sysname, __OLD_UTS_LEN); |
1248 | memcpy(&tmp.nodename, &utsname()->nodename, __OLD_UTS_LEN); | |
1249 | memcpy(&tmp.release, &utsname()->release, __OLD_UTS_LEN); | |
1250 | memcpy(&tmp.version, &utsname()->version, __OLD_UTS_LEN); | |
1251 | memcpy(&tmp.machine, &utsname()->machine, __OLD_UTS_LEN); | |
5cacdb4a | 1252 | up_read(&uts_sem); |
ef0c8338 JH |
1253 | if (copy_to_user(name, &tmp, sizeof(tmp))) |
1254 | return -EFAULT; | |
5cacdb4a | 1255 | |
ef0c8338 JH |
1256 | if (override_architecture(name)) |
1257 | return -EFAULT; | |
1258 | if (override_release(name->release, sizeof(name->release))) | |
1259 | return -EFAULT; | |
1260 | return 0; | |
5cacdb4a CH |
1261 | } |
1262 | #endif | |
1263 | ||
5a8a82b1 | 1264 | SYSCALL_DEFINE2(sethostname, char __user *, name, int, len) |
1da177e4 LT |
1265 | { |
1266 | int errno; | |
1267 | char tmp[__NEW_UTS_LEN]; | |
1268 | ||
bb96a6f5 | 1269 | if (!ns_capable(current->nsproxy->uts_ns->user_ns, CAP_SYS_ADMIN)) |
1da177e4 | 1270 | return -EPERM; |
fc832ad3 | 1271 | |
1da177e4 LT |
1272 | if (len < 0 || len > __NEW_UTS_LEN) |
1273 | return -EINVAL; | |
1da177e4 LT |
1274 | errno = -EFAULT; |
1275 | if (!copy_from_user(tmp, name, len)) { | |
ef0c8338 | 1276 | struct new_utsname *u; |
9679e4dd | 1277 | |
ef0c8338 JH |
1278 | down_write(&uts_sem); |
1279 | u = utsname(); | |
9679e4dd AM |
1280 | memcpy(u->nodename, tmp, len); |
1281 | memset(u->nodename + len, 0, sizeof(u->nodename) - len); | |
1da177e4 | 1282 | errno = 0; |
499eea6b | 1283 | uts_proc_notify(UTS_PROC_HOSTNAME); |
ef0c8338 | 1284 | up_write(&uts_sem); |
1da177e4 | 1285 | } |
1da177e4 LT |
1286 | return errno; |
1287 | } | |
1288 | ||
1289 | #ifdef __ARCH_WANT_SYS_GETHOSTNAME | |
1290 | ||
5a8a82b1 | 1291 | SYSCALL_DEFINE2(gethostname, char __user *, name, int, len) |
1da177e4 | 1292 | { |
ef0c8338 | 1293 | int i; |
9679e4dd | 1294 | struct new_utsname *u; |
ef0c8338 | 1295 | char tmp[__NEW_UTS_LEN + 1]; |
1da177e4 LT |
1296 | |
1297 | if (len < 0) | |
1298 | return -EINVAL; | |
1299 | down_read(&uts_sem); | |
9679e4dd AM |
1300 | u = utsname(); |
1301 | i = 1 + strlen(u->nodename); | |
1da177e4 LT |
1302 | if (i > len) |
1303 | i = len; | |
ef0c8338 | 1304 | memcpy(tmp, u->nodename, i); |
1da177e4 | 1305 | up_read(&uts_sem); |
ef0c8338 JH |
1306 | if (copy_to_user(name, tmp, i)) |
1307 | return -EFAULT; | |
1308 | return 0; | |
1da177e4 LT |
1309 | } |
1310 | ||
1311 | #endif | |
1312 | ||
1313 | /* | |
1314 | * Only setdomainname; getdomainname can be implemented by calling | |
1315 | * uname() | |
1316 | */ | |
5a8a82b1 | 1317 | SYSCALL_DEFINE2(setdomainname, char __user *, name, int, len) |
1da177e4 LT |
1318 | { |
1319 | int errno; | |
1320 | char tmp[__NEW_UTS_LEN]; | |
1321 | ||
fc832ad3 | 1322 | if (!ns_capable(current->nsproxy->uts_ns->user_ns, CAP_SYS_ADMIN)) |
1da177e4 LT |
1323 | return -EPERM; |
1324 | if (len < 0 || len > __NEW_UTS_LEN) | |
1325 | return -EINVAL; | |
1326 | ||
1da177e4 LT |
1327 | errno = -EFAULT; |
1328 | if (!copy_from_user(tmp, name, len)) { | |
ef0c8338 | 1329 | struct new_utsname *u; |
9679e4dd | 1330 | |
ef0c8338 JH |
1331 | down_write(&uts_sem); |
1332 | u = utsname(); | |
9679e4dd AM |
1333 | memcpy(u->domainname, tmp, len); |
1334 | memset(u->domainname + len, 0, sizeof(u->domainname) - len); | |
1da177e4 | 1335 | errno = 0; |
499eea6b | 1336 | uts_proc_notify(UTS_PROC_DOMAINNAME); |
ef0c8338 | 1337 | up_write(&uts_sem); |
1da177e4 | 1338 | } |
1da177e4 LT |
1339 | return errno; |
1340 | } | |
1341 | ||
e48fbb69 | 1342 | SYSCALL_DEFINE2(getrlimit, unsigned int, resource, struct rlimit __user *, rlim) |
1da177e4 | 1343 | { |
b9518345 JS |
1344 | struct rlimit value; |
1345 | int ret; | |
1346 | ||
1347 | ret = do_prlimit(current, resource, NULL, &value); | |
1348 | if (!ret) | |
1349 | ret = copy_to_user(rlim, &value, sizeof(*rlim)) ? -EFAULT : 0; | |
1350 | ||
1351 | return ret; | |
1da177e4 LT |
1352 | } |
1353 | ||
d9e968cb AV |
1354 | #ifdef CONFIG_COMPAT |
1355 | ||
1356 | COMPAT_SYSCALL_DEFINE2(setrlimit, unsigned int, resource, | |
1357 | struct compat_rlimit __user *, rlim) | |
1358 | { | |
1359 | struct rlimit r; | |
1360 | struct compat_rlimit r32; | |
1361 | ||
1362 | if (copy_from_user(&r32, rlim, sizeof(struct compat_rlimit))) | |
1363 | return -EFAULT; | |
1364 | ||
1365 | if (r32.rlim_cur == COMPAT_RLIM_INFINITY) | |
1366 | r.rlim_cur = RLIM_INFINITY; | |
1367 | else | |
1368 | r.rlim_cur = r32.rlim_cur; | |
1369 | if (r32.rlim_max == COMPAT_RLIM_INFINITY) | |
1370 | r.rlim_max = RLIM_INFINITY; | |
1371 | else | |
1372 | r.rlim_max = r32.rlim_max; | |
1373 | return do_prlimit(current, resource, &r, NULL); | |
1374 | } | |
1375 | ||
1376 | COMPAT_SYSCALL_DEFINE2(getrlimit, unsigned int, resource, | |
1377 | struct compat_rlimit __user *, rlim) | |
1378 | { | |
1379 | struct rlimit r; | |
1380 | int ret; | |
1381 | ||
1382 | ret = do_prlimit(current, resource, NULL, &r); | |
1383 | if (!ret) { | |
58c7ffc0 | 1384 | struct compat_rlimit r32; |
d9e968cb AV |
1385 | if (r.rlim_cur > COMPAT_RLIM_INFINITY) |
1386 | r32.rlim_cur = COMPAT_RLIM_INFINITY; | |
1387 | else | |
1388 | r32.rlim_cur = r.rlim_cur; | |
1389 | if (r.rlim_max > COMPAT_RLIM_INFINITY) | |
1390 | r32.rlim_max = COMPAT_RLIM_INFINITY; | |
1391 | else | |
1392 | r32.rlim_max = r.rlim_max; | |
1393 | ||
1394 | if (copy_to_user(rlim, &r32, sizeof(struct compat_rlimit))) | |
1395 | return -EFAULT; | |
1396 | } | |
1397 | return ret; | |
1398 | } | |
1399 | ||
1400 | #endif | |
1401 | ||
1da177e4 LT |
1402 | #ifdef __ARCH_WANT_SYS_OLD_GETRLIMIT |
1403 | ||
1404 | /* | |
1405 | * Back compatibility for getrlimit. Needed for some apps. | |
1406 | */ | |
e48fbb69 HC |
1407 | SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource, |
1408 | struct rlimit __user *, rlim) | |
1da177e4 LT |
1409 | { |
1410 | struct rlimit x; | |
1411 | if (resource >= RLIM_NLIMITS) | |
1412 | return -EINVAL; | |
1413 | ||
fc2e448d | 1414 | resource = array_index_nospec(resource, RLIM_NLIMITS); |
1da177e4 LT |
1415 | task_lock(current->group_leader); |
1416 | x = current->signal->rlim[resource]; | |
1417 | task_unlock(current->group_leader); | |
756184b7 | 1418 | if (x.rlim_cur > 0x7FFFFFFF) |
1da177e4 | 1419 | x.rlim_cur = 0x7FFFFFFF; |
756184b7 | 1420 | if (x.rlim_max > 0x7FFFFFFF) |
1da177e4 | 1421 | x.rlim_max = 0x7FFFFFFF; |
ec94fc3d | 1422 | return copy_to_user(rlim, &x, sizeof(x)) ? -EFAULT : 0; |
1da177e4 LT |
1423 | } |
1424 | ||
613763a1 AV |
1425 | #ifdef CONFIG_COMPAT |
1426 | COMPAT_SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource, | |
1427 | struct compat_rlimit __user *, rlim) | |
1428 | { | |
1429 | struct rlimit r; | |
1430 | ||
1431 | if (resource >= RLIM_NLIMITS) | |
1432 | return -EINVAL; | |
1433 | ||
fc2e448d | 1434 | resource = array_index_nospec(resource, RLIM_NLIMITS); |
613763a1 AV |
1435 | task_lock(current->group_leader); |
1436 | r = current->signal->rlim[resource]; | |
1437 | task_unlock(current->group_leader); | |
1438 | if (r.rlim_cur > 0x7FFFFFFF) | |
1439 | r.rlim_cur = 0x7FFFFFFF; | |
1440 | if (r.rlim_max > 0x7FFFFFFF) | |
1441 | r.rlim_max = 0x7FFFFFFF; | |
1442 | ||
1443 | if (put_user(r.rlim_cur, &rlim->rlim_cur) || | |
1444 | put_user(r.rlim_max, &rlim->rlim_max)) | |
1445 | return -EFAULT; | |
1446 | return 0; | |
1447 | } | |
1448 | #endif | |
1449 | ||
1da177e4 LT |
1450 | #endif |
1451 | ||
c022a0ac JS |
1452 | static inline bool rlim64_is_infinity(__u64 rlim64) |
1453 | { | |
1454 | #if BITS_PER_LONG < 64 | |
1455 | return rlim64 >= ULONG_MAX; | |
1456 | #else | |
1457 | return rlim64 == RLIM64_INFINITY; | |
1458 | #endif | |
1459 | } | |
1460 | ||
1461 | static void rlim_to_rlim64(const struct rlimit *rlim, struct rlimit64 *rlim64) | |
1462 | { | |
1463 | if (rlim->rlim_cur == RLIM_INFINITY) | |
1464 | rlim64->rlim_cur = RLIM64_INFINITY; | |
1465 | else | |
1466 | rlim64->rlim_cur = rlim->rlim_cur; | |
1467 | if (rlim->rlim_max == RLIM_INFINITY) | |
1468 | rlim64->rlim_max = RLIM64_INFINITY; | |
1469 | else | |
1470 | rlim64->rlim_max = rlim->rlim_max; | |
1471 | } | |
1472 | ||
1473 | static void rlim64_to_rlim(const struct rlimit64 *rlim64, struct rlimit *rlim) | |
1474 | { | |
1475 | if (rlim64_is_infinity(rlim64->rlim_cur)) | |
1476 | rlim->rlim_cur = RLIM_INFINITY; | |
1477 | else | |
1478 | rlim->rlim_cur = (unsigned long)rlim64->rlim_cur; | |
1479 | if (rlim64_is_infinity(rlim64->rlim_max)) | |
1480 | rlim->rlim_max = RLIM_INFINITY; | |
1481 | else | |
1482 | rlim->rlim_max = (unsigned long)rlim64->rlim_max; | |
1483 | } | |
1484 | ||
1c1e618d | 1485 | /* make sure you are allowed to change @tsk limits before calling this */ |
5b41535a JS |
1486 | int do_prlimit(struct task_struct *tsk, unsigned int resource, |
1487 | struct rlimit *new_rlim, struct rlimit *old_rlim) | |
1da177e4 | 1488 | { |
5b41535a | 1489 | struct rlimit *rlim; |
86f162f4 | 1490 | int retval = 0; |
1da177e4 LT |
1491 | |
1492 | if (resource >= RLIM_NLIMITS) | |
1493 | return -EINVAL; | |
5b41535a JS |
1494 | if (new_rlim) { |
1495 | if (new_rlim->rlim_cur > new_rlim->rlim_max) | |
1496 | return -EINVAL; | |
1497 | if (resource == RLIMIT_NOFILE && | |
1498 | new_rlim->rlim_max > sysctl_nr_open) | |
1499 | return -EPERM; | |
1500 | } | |
1da177e4 | 1501 | |
1c1e618d JS |
1502 | /* protect tsk->signal and tsk->sighand from disappearing */ |
1503 | read_lock(&tasklist_lock); | |
1504 | if (!tsk->sighand) { | |
1505 | retval = -ESRCH; | |
1506 | goto out; | |
1507 | } | |
1508 | ||
5b41535a | 1509 | rlim = tsk->signal->rlim + resource; |
86f162f4 | 1510 | task_lock(tsk->group_leader); |
5b41535a | 1511 | if (new_rlim) { |
fc832ad3 SH |
1512 | /* Keep the capable check against init_user_ns until |
1513 | cgroups can contain all limits */ | |
5b41535a JS |
1514 | if (new_rlim->rlim_max > rlim->rlim_max && |
1515 | !capable(CAP_SYS_RESOURCE)) | |
1516 | retval = -EPERM; | |
1517 | if (!retval) | |
cad4ea54 | 1518 | retval = security_task_setrlimit(tsk, resource, new_rlim); |
5b41535a JS |
1519 | if (resource == RLIMIT_CPU && new_rlim->rlim_cur == 0) { |
1520 | /* | |
1521 | * The caller is asking for an immediate RLIMIT_CPU | |
1522 | * expiry. But we use the zero value to mean "it was | |
1523 | * never set". So let's cheat and make it one second | |
1524 | * instead | |
1525 | */ | |
1526 | new_rlim->rlim_cur = 1; | |
1527 | } | |
1528 | } | |
1529 | if (!retval) { | |
1530 | if (old_rlim) | |
1531 | *old_rlim = *rlim; | |
1532 | if (new_rlim) | |
1533 | *rlim = *new_rlim; | |
9926e4c7 | 1534 | } |
7855c35d | 1535 | task_unlock(tsk->group_leader); |
1da177e4 | 1536 | |
d3561f78 AM |
1537 | /* |
1538 | * RLIMIT_CPU handling. Note that the kernel fails to return an error | |
1539 | * code if it rejected the user's attempt to set RLIMIT_CPU. This is a | |
1540 | * very long-standing error, and fixing it now risks breakage of | |
1541 | * applications, so we live with it | |
1542 | */ | |
5b41535a | 1543 | if (!retval && new_rlim && resource == RLIMIT_CPU && |
baa73d9e NP |
1544 | new_rlim->rlim_cur != RLIM_INFINITY && |
1545 | IS_ENABLED(CONFIG_POSIX_TIMERS)) | |
5b41535a | 1546 | update_rlimit_cpu(tsk, new_rlim->rlim_cur); |
ec9e16ba | 1547 | out: |
1c1e618d | 1548 | read_unlock(&tasklist_lock); |
2fb9d268 | 1549 | return retval; |
1da177e4 LT |
1550 | } |
1551 | ||
c022a0ac | 1552 | /* rcu lock must be held */ |
791ec491 SS |
1553 | static int check_prlimit_permission(struct task_struct *task, |
1554 | unsigned int flags) | |
c022a0ac JS |
1555 | { |
1556 | const struct cred *cred = current_cred(), *tcred; | |
791ec491 | 1557 | bool id_match; |
c022a0ac | 1558 | |
fc832ad3 SH |
1559 | if (current == task) |
1560 | return 0; | |
c022a0ac | 1561 | |
fc832ad3 | 1562 | tcred = __task_cred(task); |
791ec491 SS |
1563 | id_match = (uid_eq(cred->uid, tcred->euid) && |
1564 | uid_eq(cred->uid, tcred->suid) && | |
1565 | uid_eq(cred->uid, tcred->uid) && | |
1566 | gid_eq(cred->gid, tcred->egid) && | |
1567 | gid_eq(cred->gid, tcred->sgid) && | |
1568 | gid_eq(cred->gid, tcred->gid)); | |
1569 | if (!id_match && !ns_capable(tcred->user_ns, CAP_SYS_RESOURCE)) | |
1570 | return -EPERM; | |
fc832ad3 | 1571 | |
791ec491 | 1572 | return security_task_prlimit(cred, tcred, flags); |
c022a0ac JS |
1573 | } |
1574 | ||
1575 | SYSCALL_DEFINE4(prlimit64, pid_t, pid, unsigned int, resource, | |
1576 | const struct rlimit64 __user *, new_rlim, | |
1577 | struct rlimit64 __user *, old_rlim) | |
1578 | { | |
1579 | struct rlimit64 old64, new64; | |
1580 | struct rlimit old, new; | |
1581 | struct task_struct *tsk; | |
791ec491 | 1582 | unsigned int checkflags = 0; |
c022a0ac JS |
1583 | int ret; |
1584 | ||
791ec491 SS |
1585 | if (old_rlim) |
1586 | checkflags |= LSM_PRLIMIT_READ; | |
1587 | ||
c022a0ac JS |
1588 | if (new_rlim) { |
1589 | if (copy_from_user(&new64, new_rlim, sizeof(new64))) | |
1590 | return -EFAULT; | |
1591 | rlim64_to_rlim(&new64, &new); | |
791ec491 | 1592 | checkflags |= LSM_PRLIMIT_WRITE; |
c022a0ac JS |
1593 | } |
1594 | ||
1595 | rcu_read_lock(); | |
1596 | tsk = pid ? find_task_by_vpid(pid) : current; | |
1597 | if (!tsk) { | |
1598 | rcu_read_unlock(); | |
1599 | return -ESRCH; | |
1600 | } | |
791ec491 | 1601 | ret = check_prlimit_permission(tsk, checkflags); |
c022a0ac JS |
1602 | if (ret) { |
1603 | rcu_read_unlock(); | |
1604 | return ret; | |
1605 | } | |
1606 | get_task_struct(tsk); | |
1607 | rcu_read_unlock(); | |
1608 | ||
1609 | ret = do_prlimit(tsk, resource, new_rlim ? &new : NULL, | |
1610 | old_rlim ? &old : NULL); | |
1611 | ||
1612 | if (!ret && old_rlim) { | |
1613 | rlim_to_rlim64(&old, &old64); | |
1614 | if (copy_to_user(old_rlim, &old64, sizeof(old64))) | |
1615 | ret = -EFAULT; | |
1616 | } | |
1617 | ||
1618 | put_task_struct(tsk); | |
1619 | return ret; | |
1620 | } | |
1621 | ||
7855c35d JS |
1622 | SYSCALL_DEFINE2(setrlimit, unsigned int, resource, struct rlimit __user *, rlim) |
1623 | { | |
1624 | struct rlimit new_rlim; | |
1625 | ||
1626 | if (copy_from_user(&new_rlim, rlim, sizeof(*rlim))) | |
1627 | return -EFAULT; | |
5b41535a | 1628 | return do_prlimit(current, resource, &new_rlim, NULL); |
7855c35d JS |
1629 | } |
1630 | ||
1da177e4 LT |
1631 | /* |
1632 | * It would make sense to put struct rusage in the task_struct, | |
1633 | * except that would make the task_struct be *really big*. After | |
1634 | * task_struct gets moved into malloc'ed memory, it would | |
1635 | * make sense to do this. It will make moving the rest of the information | |
1636 | * a lot simpler! (Which we're not doing right now because we're not | |
1637 | * measuring them yet). | |
1638 | * | |
1da177e4 LT |
1639 | * When sampling multiple threads for RUSAGE_SELF, under SMP we might have |
1640 | * races with threads incrementing their own counters. But since word | |
1641 | * reads are atomic, we either get new values or old values and we don't | |
1642 | * care which for the sums. We always take the siglock to protect reading | |
1643 | * the c* fields from p->signal from races with exit.c updating those | |
1644 | * fields when reaping, so a sample either gets all the additions of a | |
1645 | * given child after it's reaped, or none so this sample is before reaping. | |
2dd0ebcd | 1646 | * |
de047c1b RT |
1647 | * Locking: |
1648 | * We need to take the siglock for CHILDEREN, SELF and BOTH | |
1649 | * for the cases current multithreaded, non-current single threaded | |
1650 | * non-current multithreaded. Thread traversal is now safe with | |
1651 | * the siglock held. | |
1652 | * Strictly speaking, we donot need to take the siglock if we are current and | |
1653 | * single threaded, as no one else can take our signal_struct away, no one | |
1654 | * else can reap the children to update signal->c* counters, and no one else | |
1655 | * can race with the signal-> fields. If we do not take any lock, the | |
1656 | * signal-> fields could be read out of order while another thread was just | |
1657 | * exiting. So we should place a read memory barrier when we avoid the lock. | |
1658 | * On the writer side, write memory barrier is implied in __exit_signal | |
1659 | * as __exit_signal releases the siglock spinlock after updating the signal-> | |
1660 | * fields. But we don't do this yet to keep things simple. | |
2dd0ebcd | 1661 | * |
1da177e4 LT |
1662 | */ |
1663 | ||
f06febc9 | 1664 | static void accumulate_thread_rusage(struct task_struct *t, struct rusage *r) |
679c9cd4 | 1665 | { |
679c9cd4 SK |
1666 | r->ru_nvcsw += t->nvcsw; |
1667 | r->ru_nivcsw += t->nivcsw; | |
1668 | r->ru_minflt += t->min_flt; | |
1669 | r->ru_majflt += t->maj_flt; | |
1670 | r->ru_inblock += task_io_get_inblock(t); | |
1671 | r->ru_oublock += task_io_get_oublock(t); | |
1672 | } | |
1673 | ||
ce72a16f | 1674 | void getrusage(struct task_struct *p, int who, struct rusage *r) |
1da177e4 LT |
1675 | { |
1676 | struct task_struct *t; | |
1677 | unsigned long flags; | |
5613fda9 | 1678 | u64 tgutime, tgstime, utime, stime; |
1f10206c | 1679 | unsigned long maxrss = 0; |
1da177e4 | 1680 | |
ec94fc3d | 1681 | memset((char *)r, 0, sizeof (*r)); |
64861634 | 1682 | utime = stime = 0; |
1da177e4 | 1683 | |
679c9cd4 | 1684 | if (who == RUSAGE_THREAD) { |
e80d0a1a | 1685 | task_cputime_adjusted(current, &utime, &stime); |
f06febc9 | 1686 | accumulate_thread_rusage(p, r); |
1f10206c | 1687 | maxrss = p->signal->maxrss; |
679c9cd4 SK |
1688 | goto out; |
1689 | } | |
1690 | ||
d6cf723a | 1691 | if (!lock_task_sighand(p, &flags)) |
de047c1b | 1692 | return; |
0f59cc4a | 1693 | |
1da177e4 | 1694 | switch (who) { |
ec94fc3d | 1695 | case RUSAGE_BOTH: |
1696 | case RUSAGE_CHILDREN: | |
1697 | utime = p->signal->cutime; | |
1698 | stime = p->signal->cstime; | |
1699 | r->ru_nvcsw = p->signal->cnvcsw; | |
1700 | r->ru_nivcsw = p->signal->cnivcsw; | |
1701 | r->ru_minflt = p->signal->cmin_flt; | |
1702 | r->ru_majflt = p->signal->cmaj_flt; | |
1703 | r->ru_inblock = p->signal->cinblock; | |
1704 | r->ru_oublock = p->signal->coublock; | |
1705 | maxrss = p->signal->cmaxrss; | |
1706 | ||
1707 | if (who == RUSAGE_CHILDREN) | |
1da177e4 | 1708 | break; |
0f59cc4a | 1709 | |
ec94fc3d | 1710 | case RUSAGE_SELF: |
1711 | thread_group_cputime_adjusted(p, &tgutime, &tgstime); | |
1712 | utime += tgutime; | |
1713 | stime += tgstime; | |
1714 | r->ru_nvcsw += p->signal->nvcsw; | |
1715 | r->ru_nivcsw += p->signal->nivcsw; | |
1716 | r->ru_minflt += p->signal->min_flt; | |
1717 | r->ru_majflt += p->signal->maj_flt; | |
1718 | r->ru_inblock += p->signal->inblock; | |
1719 | r->ru_oublock += p->signal->oublock; | |
1720 | if (maxrss < p->signal->maxrss) | |
1721 | maxrss = p->signal->maxrss; | |
1722 | t = p; | |
1723 | do { | |
1724 | accumulate_thread_rusage(t, r); | |
1725 | } while_each_thread(p, t); | |
1726 | break; | |
1727 | ||
1728 | default: | |
1729 | BUG(); | |
1da177e4 | 1730 | } |
de047c1b | 1731 | unlock_task_sighand(p, &flags); |
de047c1b | 1732 | |
679c9cd4 | 1733 | out: |
5613fda9 FW |
1734 | r->ru_utime = ns_to_timeval(utime); |
1735 | r->ru_stime = ns_to_timeval(stime); | |
1f10206c JP |
1736 | |
1737 | if (who != RUSAGE_CHILDREN) { | |
1738 | struct mm_struct *mm = get_task_mm(p); | |
ec94fc3d | 1739 | |
1f10206c JP |
1740 | if (mm) { |
1741 | setmax_mm_hiwater_rss(&maxrss, mm); | |
1742 | mmput(mm); | |
1743 | } | |
1744 | } | |
1745 | r->ru_maxrss = maxrss * (PAGE_SIZE / 1024); /* convert pages to KBs */ | |
1da177e4 LT |
1746 | } |
1747 | ||
ce72a16f | 1748 | SYSCALL_DEFINE2(getrusage, int, who, struct rusage __user *, ru) |
1da177e4 LT |
1749 | { |
1750 | struct rusage r; | |
ec94fc3d | 1751 | |
679c9cd4 SK |
1752 | if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN && |
1753 | who != RUSAGE_THREAD) | |
1da177e4 | 1754 | return -EINVAL; |
ce72a16f AV |
1755 | |
1756 | getrusage(current, who, &r); | |
1757 | return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0; | |
1da177e4 LT |
1758 | } |
1759 | ||
8d2d5c4a AV |
1760 | #ifdef CONFIG_COMPAT |
1761 | COMPAT_SYSCALL_DEFINE2(getrusage, int, who, struct compat_rusage __user *, ru) | |
1762 | { | |
1763 | struct rusage r; | |
1764 | ||
1765 | if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN && | |
1766 | who != RUSAGE_THREAD) | |
1767 | return -EINVAL; | |
1768 | ||
ce72a16f | 1769 | getrusage(current, who, &r); |
8d2d5c4a AV |
1770 | return put_compat_rusage(&r, ru); |
1771 | } | |
1772 | #endif | |
1773 | ||
e48fbb69 | 1774 | SYSCALL_DEFINE1(umask, int, mask) |
1da177e4 LT |
1775 | { |
1776 | mask = xchg(¤t->fs->umask, mask & S_IRWXUGO); | |
1777 | return mask; | |
1778 | } | |
3b7391de | 1779 | |
6e399cd1 | 1780 | static int prctl_set_mm_exe_file(struct mm_struct *mm, unsigned int fd) |
b32dfe37 | 1781 | { |
2903ff01 | 1782 | struct fd exe; |
6e399cd1 | 1783 | struct file *old_exe, *exe_file; |
496ad9aa | 1784 | struct inode *inode; |
2903ff01 | 1785 | int err; |
b32dfe37 | 1786 | |
2903ff01 AV |
1787 | exe = fdget(fd); |
1788 | if (!exe.file) | |
b32dfe37 CG |
1789 | return -EBADF; |
1790 | ||
496ad9aa | 1791 | inode = file_inode(exe.file); |
b32dfe37 CG |
1792 | |
1793 | /* | |
1794 | * Because the original mm->exe_file points to executable file, make | |
1795 | * sure that this one is executable as well, to avoid breaking an | |
1796 | * overall picture. | |
1797 | */ | |
1798 | err = -EACCES; | |
90f8572b | 1799 | if (!S_ISREG(inode->i_mode) || path_noexec(&exe.file->f_path)) |
b32dfe37 CG |
1800 | goto exit; |
1801 | ||
496ad9aa | 1802 | err = inode_permission(inode, MAY_EXEC); |
b32dfe37 CG |
1803 | if (err) |
1804 | goto exit; | |
1805 | ||
bafb282d | 1806 | /* |
4229fb1d | 1807 | * Forbid mm->exe_file change if old file still mapped. |
bafb282d | 1808 | */ |
6e399cd1 | 1809 | exe_file = get_mm_exe_file(mm); |
bafb282d | 1810 | err = -EBUSY; |
6e399cd1 | 1811 | if (exe_file) { |
4229fb1d KK |
1812 | struct vm_area_struct *vma; |
1813 | ||
6e399cd1 DB |
1814 | down_read(&mm->mmap_sem); |
1815 | for (vma = mm->mmap; vma; vma = vma->vm_next) { | |
1816 | if (!vma->vm_file) | |
1817 | continue; | |
1818 | if (path_equal(&vma->vm_file->f_path, | |
1819 | &exe_file->f_path)) | |
1820 | goto exit_err; | |
1821 | } | |
1822 | ||
1823 | up_read(&mm->mmap_sem); | |
1824 | fput(exe_file); | |
bafb282d KK |
1825 | } |
1826 | ||
4229fb1d | 1827 | err = 0; |
6e399cd1 DB |
1828 | /* set the new file, lockless */ |
1829 | get_file(exe.file); | |
1830 | old_exe = xchg(&mm->exe_file, exe.file); | |
1831 | if (old_exe) | |
1832 | fput(old_exe); | |
b32dfe37 | 1833 | exit: |
2903ff01 | 1834 | fdput(exe); |
b32dfe37 | 1835 | return err; |
6e399cd1 DB |
1836 | exit_err: |
1837 | up_read(&mm->mmap_sem); | |
1838 | fput(exe_file); | |
1839 | goto exit; | |
b32dfe37 CG |
1840 | } |
1841 | ||
f606b77f CG |
1842 | /* |
1843 | * WARNING: we don't require any capability here so be very careful | |
1844 | * in what is allowed for modification from userspace. | |
1845 | */ | |
1846 | static int validate_prctl_map(struct prctl_mm_map *prctl_map) | |
1847 | { | |
1848 | unsigned long mmap_max_addr = TASK_SIZE; | |
1849 | struct mm_struct *mm = current->mm; | |
1850 | int error = -EINVAL, i; | |
1851 | ||
1852 | static const unsigned char offsets[] = { | |
1853 | offsetof(struct prctl_mm_map, start_code), | |
1854 | offsetof(struct prctl_mm_map, end_code), | |
1855 | offsetof(struct prctl_mm_map, start_data), | |
1856 | offsetof(struct prctl_mm_map, end_data), | |
1857 | offsetof(struct prctl_mm_map, start_brk), | |
1858 | offsetof(struct prctl_mm_map, brk), | |
1859 | offsetof(struct prctl_mm_map, start_stack), | |
1860 | offsetof(struct prctl_mm_map, arg_start), | |
1861 | offsetof(struct prctl_mm_map, arg_end), | |
1862 | offsetof(struct prctl_mm_map, env_start), | |
1863 | offsetof(struct prctl_mm_map, env_end), | |
1864 | }; | |
1865 | ||
1866 | /* | |
1867 | * Make sure the members are not somewhere outside | |
1868 | * of allowed address space. | |
1869 | */ | |
1870 | for (i = 0; i < ARRAY_SIZE(offsets); i++) { | |
1871 | u64 val = *(u64 *)((char *)prctl_map + offsets[i]); | |
1872 | ||
1873 | if ((unsigned long)val >= mmap_max_addr || | |
1874 | (unsigned long)val < mmap_min_addr) | |
1875 | goto out; | |
1876 | } | |
1877 | ||
1878 | /* | |
1879 | * Make sure the pairs are ordered. | |
1880 | */ | |
1881 | #define __prctl_check_order(__m1, __op, __m2) \ | |
1882 | ((unsigned long)prctl_map->__m1 __op \ | |
1883 | (unsigned long)prctl_map->__m2) ? 0 : -EINVAL | |
1884 | error = __prctl_check_order(start_code, <, end_code); | |
1885 | error |= __prctl_check_order(start_data, <, end_data); | |
1886 | error |= __prctl_check_order(start_brk, <=, brk); | |
1887 | error |= __prctl_check_order(arg_start, <=, arg_end); | |
1888 | error |= __prctl_check_order(env_start, <=, env_end); | |
1889 | if (error) | |
1890 | goto out; | |
1891 | #undef __prctl_check_order | |
1892 | ||
1893 | error = -EINVAL; | |
1894 | ||
1895 | /* | |
1896 | * @brk should be after @end_data in traditional maps. | |
1897 | */ | |
1898 | if (prctl_map->start_brk <= prctl_map->end_data || | |
1899 | prctl_map->brk <= prctl_map->end_data) | |
1900 | goto out; | |
1901 | ||
1902 | /* | |
1903 | * Neither we should allow to override limits if they set. | |
1904 | */ | |
1905 | if (check_data_rlimit(rlimit(RLIMIT_DATA), prctl_map->brk, | |
1906 | prctl_map->start_brk, prctl_map->end_data, | |
1907 | prctl_map->start_data)) | |
1908 | goto out; | |
1909 | ||
1910 | /* | |
1911 | * Someone is trying to cheat the auxv vector. | |
1912 | */ | |
1913 | if (prctl_map->auxv_size) { | |
1914 | if (!prctl_map->auxv || prctl_map->auxv_size > sizeof(mm->saved_auxv)) | |
1915 | goto out; | |
1916 | } | |
1917 | ||
1918 | /* | |
1919 | * Finally, make sure the caller has the rights to | |
4d28df61 | 1920 | * change /proc/pid/exe link: only local sys admin should |
f606b77f CG |
1921 | * be allowed to. |
1922 | */ | |
1923 | if (prctl_map->exe_fd != (u32)-1) { | |
4d28df61 | 1924 | if (!ns_capable(current_user_ns(), CAP_SYS_ADMIN)) |
f606b77f CG |
1925 | goto out; |
1926 | } | |
1927 | ||
1928 | error = 0; | |
1929 | out: | |
1930 | return error; | |
1931 | } | |
1932 | ||
4a00e9df | 1933 | #ifdef CONFIG_CHECKPOINT_RESTORE |
f606b77f CG |
1934 | static int prctl_set_mm_map(int opt, const void __user *addr, unsigned long data_size) |
1935 | { | |
1936 | struct prctl_mm_map prctl_map = { .exe_fd = (u32)-1, }; | |
1937 | unsigned long user_auxv[AT_VECTOR_SIZE]; | |
1938 | struct mm_struct *mm = current->mm; | |
1939 | int error; | |
1940 | ||
1941 | BUILD_BUG_ON(sizeof(user_auxv) != sizeof(mm->saved_auxv)); | |
1942 | BUILD_BUG_ON(sizeof(struct prctl_mm_map) > 256); | |
1943 | ||
1944 | if (opt == PR_SET_MM_MAP_SIZE) | |
1945 | return put_user((unsigned int)sizeof(prctl_map), | |
1946 | (unsigned int __user *)addr); | |
1947 | ||
1948 | if (data_size != sizeof(prctl_map)) | |
1949 | return -EINVAL; | |
1950 | ||
1951 | if (copy_from_user(&prctl_map, addr, sizeof(prctl_map))) | |
1952 | return -EFAULT; | |
1953 | ||
1954 | error = validate_prctl_map(&prctl_map); | |
1955 | if (error) | |
1956 | return error; | |
1957 | ||
1958 | if (prctl_map.auxv_size) { | |
1959 | memset(user_auxv, 0, sizeof(user_auxv)); | |
1960 | if (copy_from_user(user_auxv, | |
1961 | (const void __user *)prctl_map.auxv, | |
1962 | prctl_map.auxv_size)) | |
1963 | return -EFAULT; | |
1964 | ||
1965 | /* Last entry must be AT_NULL as specification requires */ | |
1966 | user_auxv[AT_VECTOR_SIZE - 2] = AT_NULL; | |
1967 | user_auxv[AT_VECTOR_SIZE - 1] = AT_NULL; | |
1968 | } | |
1969 | ||
ddf1d398 | 1970 | if (prctl_map.exe_fd != (u32)-1) { |
6e399cd1 | 1971 | error = prctl_set_mm_exe_file(mm, prctl_map.exe_fd); |
ddf1d398 MG |
1972 | if (error) |
1973 | return error; | |
1974 | } | |
1975 | ||
1976 | down_write(&mm->mmap_sem); | |
f606b77f CG |
1977 | |
1978 | /* | |
1979 | * We don't validate if these members are pointing to | |
1980 | * real present VMAs because application may have correspond | |
1981 | * VMAs already unmapped and kernel uses these members for statistics | |
1982 | * output in procfs mostly, except | |
1983 | * | |
1984 | * - @start_brk/@brk which are used in do_brk but kernel lookups | |
1985 | * for VMAs when updating these memvers so anything wrong written | |
1986 | * here cause kernel to swear at userspace program but won't lead | |
1987 | * to any problem in kernel itself | |
1988 | */ | |
1989 | ||
1990 | mm->start_code = prctl_map.start_code; | |
1991 | mm->end_code = prctl_map.end_code; | |
1992 | mm->start_data = prctl_map.start_data; | |
1993 | mm->end_data = prctl_map.end_data; | |
1994 | mm->start_brk = prctl_map.start_brk; | |
1995 | mm->brk = prctl_map.brk; | |
1996 | mm->start_stack = prctl_map.start_stack; | |
1997 | mm->arg_start = prctl_map.arg_start; | |
1998 | mm->arg_end = prctl_map.arg_end; | |
1999 | mm->env_start = prctl_map.env_start; | |
2000 | mm->env_end = prctl_map.env_end; | |
2001 | ||
2002 | /* | |
2003 | * Note this update of @saved_auxv is lockless thus | |
2004 | * if someone reads this member in procfs while we're | |
2005 | * updating -- it may get partly updated results. It's | |
2006 | * known and acceptable trade off: we leave it as is to | |
2007 | * not introduce additional locks here making the kernel | |
2008 | * more complex. | |
2009 | */ | |
2010 | if (prctl_map.auxv_size) | |
2011 | memcpy(mm->saved_auxv, user_auxv, sizeof(user_auxv)); | |
2012 | ||
ddf1d398 MG |
2013 | up_write(&mm->mmap_sem); |
2014 | return 0; | |
f606b77f CG |
2015 | } |
2016 | #endif /* CONFIG_CHECKPOINT_RESTORE */ | |
2017 | ||
4a00e9df AD |
2018 | static int prctl_set_auxv(struct mm_struct *mm, unsigned long addr, |
2019 | unsigned long len) | |
2020 | { | |
2021 | /* | |
2022 | * This doesn't move the auxiliary vector itself since it's pinned to | |
2023 | * mm_struct, but it permits filling the vector with new values. It's | |
2024 | * up to the caller to provide sane values here, otherwise userspace | |
2025 | * tools which use this vector might be unhappy. | |
2026 | */ | |
2027 | unsigned long user_auxv[AT_VECTOR_SIZE]; | |
2028 | ||
2029 | if (len > sizeof(user_auxv)) | |
2030 | return -EINVAL; | |
2031 | ||
2032 | if (copy_from_user(user_auxv, (const void __user *)addr, len)) | |
2033 | return -EFAULT; | |
2034 | ||
2035 | /* Make sure the last entry is always AT_NULL */ | |
2036 | user_auxv[AT_VECTOR_SIZE - 2] = 0; | |
2037 | user_auxv[AT_VECTOR_SIZE - 1] = 0; | |
2038 | ||
2039 | BUILD_BUG_ON(sizeof(user_auxv) != sizeof(mm->saved_auxv)); | |
2040 | ||
2041 | task_lock(current); | |
2042 | memcpy(mm->saved_auxv, user_auxv, len); | |
2043 | task_unlock(current); | |
2044 | ||
2045 | return 0; | |
2046 | } | |
2047 | ||
028ee4be CG |
2048 | static int prctl_set_mm(int opt, unsigned long addr, |
2049 | unsigned long arg4, unsigned long arg5) | |
2050 | { | |
028ee4be | 2051 | struct mm_struct *mm = current->mm; |
4a00e9df | 2052 | struct prctl_mm_map prctl_map; |
fe8c7f5c CG |
2053 | struct vm_area_struct *vma; |
2054 | int error; | |
028ee4be | 2055 | |
f606b77f CG |
2056 | if (arg5 || (arg4 && (opt != PR_SET_MM_AUXV && |
2057 | opt != PR_SET_MM_MAP && | |
2058 | opt != PR_SET_MM_MAP_SIZE))) | |
028ee4be CG |
2059 | return -EINVAL; |
2060 | ||
f606b77f CG |
2061 | #ifdef CONFIG_CHECKPOINT_RESTORE |
2062 | if (opt == PR_SET_MM_MAP || opt == PR_SET_MM_MAP_SIZE) | |
2063 | return prctl_set_mm_map(opt, (const void __user *)addr, arg4); | |
2064 | #endif | |
2065 | ||
79f0713d | 2066 | if (!capable(CAP_SYS_RESOURCE)) |
028ee4be CG |
2067 | return -EPERM; |
2068 | ||
6e399cd1 DB |
2069 | if (opt == PR_SET_MM_EXE_FILE) |
2070 | return prctl_set_mm_exe_file(mm, (unsigned int)addr); | |
b32dfe37 | 2071 | |
4a00e9df AD |
2072 | if (opt == PR_SET_MM_AUXV) |
2073 | return prctl_set_auxv(mm, addr, arg4); | |
2074 | ||
1ad75b9e | 2075 | if (addr >= TASK_SIZE || addr < mmap_min_addr) |
028ee4be CG |
2076 | return -EINVAL; |
2077 | ||
fe8c7f5c CG |
2078 | error = -EINVAL; |
2079 | ||
ddf1d398 | 2080 | down_write(&mm->mmap_sem); |
028ee4be CG |
2081 | vma = find_vma(mm, addr); |
2082 | ||
4a00e9df AD |
2083 | prctl_map.start_code = mm->start_code; |
2084 | prctl_map.end_code = mm->end_code; | |
2085 | prctl_map.start_data = mm->start_data; | |
2086 | prctl_map.end_data = mm->end_data; | |
2087 | prctl_map.start_brk = mm->start_brk; | |
2088 | prctl_map.brk = mm->brk; | |
2089 | prctl_map.start_stack = mm->start_stack; | |
2090 | prctl_map.arg_start = mm->arg_start; | |
2091 | prctl_map.arg_end = mm->arg_end; | |
2092 | prctl_map.env_start = mm->env_start; | |
2093 | prctl_map.env_end = mm->env_end; | |
2094 | prctl_map.auxv = NULL; | |
2095 | prctl_map.auxv_size = 0; | |
2096 | prctl_map.exe_fd = -1; | |
2097 | ||
028ee4be CG |
2098 | switch (opt) { |
2099 | case PR_SET_MM_START_CODE: | |
4a00e9df | 2100 | prctl_map.start_code = addr; |
fe8c7f5c | 2101 | break; |
028ee4be | 2102 | case PR_SET_MM_END_CODE: |
4a00e9df | 2103 | prctl_map.end_code = addr; |
028ee4be | 2104 | break; |
028ee4be | 2105 | case PR_SET_MM_START_DATA: |
4a00e9df | 2106 | prctl_map.start_data = addr; |
028ee4be | 2107 | break; |
fe8c7f5c | 2108 | case PR_SET_MM_END_DATA: |
4a00e9df AD |
2109 | prctl_map.end_data = addr; |
2110 | break; | |
2111 | case PR_SET_MM_START_STACK: | |
2112 | prctl_map.start_stack = addr; | |
028ee4be | 2113 | break; |
028ee4be | 2114 | case PR_SET_MM_START_BRK: |
4a00e9df | 2115 | prctl_map.start_brk = addr; |
028ee4be | 2116 | break; |
028ee4be | 2117 | case PR_SET_MM_BRK: |
4a00e9df | 2118 | prctl_map.brk = addr; |
028ee4be | 2119 | break; |
4a00e9df AD |
2120 | case PR_SET_MM_ARG_START: |
2121 | prctl_map.arg_start = addr; | |
2122 | break; | |
2123 | case PR_SET_MM_ARG_END: | |
2124 | prctl_map.arg_end = addr; | |
2125 | break; | |
2126 | case PR_SET_MM_ENV_START: | |
2127 | prctl_map.env_start = addr; | |
2128 | break; | |
2129 | case PR_SET_MM_ENV_END: | |
2130 | prctl_map.env_end = addr; | |
2131 | break; | |
2132 | default: | |
2133 | goto out; | |
2134 | } | |
2135 | ||
2136 | error = validate_prctl_map(&prctl_map); | |
2137 | if (error) | |
2138 | goto out; | |
028ee4be | 2139 | |
4a00e9df | 2140 | switch (opt) { |
fe8c7f5c CG |
2141 | /* |
2142 | * If command line arguments and environment | |
2143 | * are placed somewhere else on stack, we can | |
2144 | * set them up here, ARG_START/END to setup | |
2145 | * command line argumets and ENV_START/END | |
2146 | * for environment. | |
2147 | */ | |
2148 | case PR_SET_MM_START_STACK: | |
2149 | case PR_SET_MM_ARG_START: | |
2150 | case PR_SET_MM_ARG_END: | |
2151 | case PR_SET_MM_ENV_START: | |
2152 | case PR_SET_MM_ENV_END: | |
2153 | if (!vma) { | |
2154 | error = -EFAULT; | |
2155 | goto out; | |
2156 | } | |
028ee4be CG |
2157 | } |
2158 | ||
4a00e9df AD |
2159 | mm->start_code = prctl_map.start_code; |
2160 | mm->end_code = prctl_map.end_code; | |
2161 | mm->start_data = prctl_map.start_data; | |
2162 | mm->end_data = prctl_map.end_data; | |
2163 | mm->start_brk = prctl_map.start_brk; | |
2164 | mm->brk = prctl_map.brk; | |
2165 | mm->start_stack = prctl_map.start_stack; | |
2166 | mm->arg_start = prctl_map.arg_start; | |
2167 | mm->arg_end = prctl_map.arg_end; | |
2168 | mm->env_start = prctl_map.env_start; | |
2169 | mm->env_end = prctl_map.env_end; | |
2170 | ||
028ee4be | 2171 | error = 0; |
028ee4be | 2172 | out: |
ddf1d398 | 2173 | up_write(&mm->mmap_sem); |
028ee4be CG |
2174 | return error; |
2175 | } | |
300f786b | 2176 | |
52b36941 | 2177 | #ifdef CONFIG_CHECKPOINT_RESTORE |
300f786b CG |
2178 | static int prctl_get_tid_address(struct task_struct *me, int __user **tid_addr) |
2179 | { | |
2180 | return put_user(me->clear_child_tid, tid_addr); | |
2181 | } | |
52b36941 | 2182 | #else |
300f786b CG |
2183 | static int prctl_get_tid_address(struct task_struct *me, int __user **tid_addr) |
2184 | { | |
2185 | return -EINVAL; | |
2186 | } | |
028ee4be CG |
2187 | #endif |
2188 | ||
749860ce PT |
2189 | static int propagate_has_child_subreaper(struct task_struct *p, void *data) |
2190 | { | |
2191 | /* | |
2192 | * If task has has_child_subreaper - all its decendants | |
2193 | * already have these flag too and new decendants will | |
2194 | * inherit it on fork, skip them. | |
2195 | * | |
2196 | * If we've found child_reaper - skip descendants in | |
2197 | * it's subtree as they will never get out pidns. | |
2198 | */ | |
2199 | if (p->signal->has_child_subreaper || | |
2200 | is_child_reaper(task_pid(p))) | |
2201 | return 0; | |
2202 | ||
2203 | p->signal->has_child_subreaper = 1; | |
2204 | return 1; | |
2205 | } | |
2206 | ||
199bfed2 | 2207 | int __weak arch_prctl_spec_ctrl_get(struct task_struct *t, unsigned long which) |
d34cff3e TG |
2208 | { |
2209 | return -EINVAL; | |
2210 | } | |
2211 | ||
199bfed2 KC |
2212 | int __weak arch_prctl_spec_ctrl_set(struct task_struct *t, unsigned long which, |
2213 | unsigned long ctrl) | |
d34cff3e TG |
2214 | { |
2215 | return -EINVAL; | |
2216 | } | |
2217 | ||
c4ea37c2 HC |
2218 | SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3, |
2219 | unsigned long, arg4, unsigned long, arg5) | |
1da177e4 | 2220 | { |
b6dff3ec DH |
2221 | struct task_struct *me = current; |
2222 | unsigned char comm[sizeof(me->comm)]; | |
2223 | long error; | |
1da177e4 | 2224 | |
d84f4f99 DH |
2225 | error = security_task_prctl(option, arg2, arg3, arg4, arg5); |
2226 | if (error != -ENOSYS) | |
1da177e4 LT |
2227 | return error; |
2228 | ||
d84f4f99 | 2229 | error = 0; |
1da177e4 | 2230 | switch (option) { |
f3cbd435 AM |
2231 | case PR_SET_PDEATHSIG: |
2232 | if (!valid_signal(arg2)) { | |
2233 | error = -EINVAL; | |
1da177e4 | 2234 | break; |
f3cbd435 AM |
2235 | } |
2236 | me->pdeath_signal = arg2; | |
2237 | break; | |
2238 | case PR_GET_PDEATHSIG: | |
2239 | error = put_user(me->pdeath_signal, (int __user *)arg2); | |
2240 | break; | |
2241 | case PR_GET_DUMPABLE: | |
2242 | error = get_dumpable(me->mm); | |
2243 | break; | |
2244 | case PR_SET_DUMPABLE: | |
2245 | if (arg2 != SUID_DUMP_DISABLE && arg2 != SUID_DUMP_USER) { | |
2246 | error = -EINVAL; | |
1da177e4 | 2247 | break; |
f3cbd435 AM |
2248 | } |
2249 | set_dumpable(me->mm, arg2); | |
2250 | break; | |
1da177e4 | 2251 | |
f3cbd435 AM |
2252 | case PR_SET_UNALIGN: |
2253 | error = SET_UNALIGN_CTL(me, arg2); | |
2254 | break; | |
2255 | case PR_GET_UNALIGN: | |
2256 | error = GET_UNALIGN_CTL(me, arg2); | |
2257 | break; | |
2258 | case PR_SET_FPEMU: | |
2259 | error = SET_FPEMU_CTL(me, arg2); | |
2260 | break; | |
2261 | case PR_GET_FPEMU: | |
2262 | error = GET_FPEMU_CTL(me, arg2); | |
2263 | break; | |
2264 | case PR_SET_FPEXC: | |
2265 | error = SET_FPEXC_CTL(me, arg2); | |
2266 | break; | |
2267 | case PR_GET_FPEXC: | |
2268 | error = GET_FPEXC_CTL(me, arg2); | |
2269 | break; | |
2270 | case PR_GET_TIMING: | |
2271 | error = PR_TIMING_STATISTICAL; | |
2272 | break; | |
2273 | case PR_SET_TIMING: | |
2274 | if (arg2 != PR_TIMING_STATISTICAL) | |
2275 | error = -EINVAL; | |
2276 | break; | |
2277 | case PR_SET_NAME: | |
2278 | comm[sizeof(me->comm) - 1] = 0; | |
2279 | if (strncpy_from_user(comm, (char __user *)arg2, | |
2280 | sizeof(me->comm) - 1) < 0) | |
2281 | return -EFAULT; | |
2282 | set_task_comm(me, comm); | |
2283 | proc_comm_connector(me); | |
2284 | break; | |
2285 | case PR_GET_NAME: | |
2286 | get_task_comm(comm, me); | |
2287 | if (copy_to_user((char __user *)arg2, comm, sizeof(comm))) | |
2288 | return -EFAULT; | |
2289 | break; | |
2290 | case PR_GET_ENDIAN: | |
2291 | error = GET_ENDIAN(me, arg2); | |
2292 | break; | |
2293 | case PR_SET_ENDIAN: | |
2294 | error = SET_ENDIAN(me, arg2); | |
2295 | break; | |
2296 | case PR_GET_SECCOMP: | |
2297 | error = prctl_get_seccomp(); | |
2298 | break; | |
2299 | case PR_SET_SECCOMP: | |
2300 | error = prctl_set_seccomp(arg2, (char __user *)arg3); | |
2301 | break; | |
2302 | case PR_GET_TSC: | |
2303 | error = GET_TSC_CTL(arg2); | |
2304 | break; | |
2305 | case PR_SET_TSC: | |
2306 | error = SET_TSC_CTL(arg2); | |
2307 | break; | |
2308 | case PR_TASK_PERF_EVENTS_DISABLE: | |
2309 | error = perf_event_task_disable(); | |
2310 | break; | |
2311 | case PR_TASK_PERF_EVENTS_ENABLE: | |
2312 | error = perf_event_task_enable(); | |
2313 | break; | |
2314 | case PR_GET_TIMERSLACK: | |
da8b44d5 JS |
2315 | if (current->timer_slack_ns > ULONG_MAX) |
2316 | error = ULONG_MAX; | |
2317 | else | |
2318 | error = current->timer_slack_ns; | |
f3cbd435 AM |
2319 | break; |
2320 | case PR_SET_TIMERSLACK: | |
2321 | if (arg2 <= 0) | |
2322 | current->timer_slack_ns = | |
6976675d | 2323 | current->default_timer_slack_ns; |
f3cbd435 AM |
2324 | else |
2325 | current->timer_slack_ns = arg2; | |
2326 | break; | |
2327 | case PR_MCE_KILL: | |
2328 | if (arg4 | arg5) | |
2329 | return -EINVAL; | |
2330 | switch (arg2) { | |
2331 | case PR_MCE_KILL_CLEAR: | |
2332 | if (arg3 != 0) | |
4db96cf0 | 2333 | return -EINVAL; |
f3cbd435 | 2334 | current->flags &= ~PF_MCE_PROCESS; |
4db96cf0 | 2335 | break; |
f3cbd435 AM |
2336 | case PR_MCE_KILL_SET: |
2337 | current->flags |= PF_MCE_PROCESS; | |
2338 | if (arg3 == PR_MCE_KILL_EARLY) | |
2339 | current->flags |= PF_MCE_EARLY; | |
2340 | else if (arg3 == PR_MCE_KILL_LATE) | |
2341 | current->flags &= ~PF_MCE_EARLY; | |
2342 | else if (arg3 == PR_MCE_KILL_DEFAULT) | |
2343 | current->flags &= | |
2344 | ~(PF_MCE_EARLY|PF_MCE_PROCESS); | |
1087e9b4 | 2345 | else |
259e5e6c | 2346 | return -EINVAL; |
259e5e6c | 2347 | break; |
1da177e4 | 2348 | default: |
f3cbd435 AM |
2349 | return -EINVAL; |
2350 | } | |
2351 | break; | |
2352 | case PR_MCE_KILL_GET: | |
2353 | if (arg2 | arg3 | arg4 | arg5) | |
2354 | return -EINVAL; | |
2355 | if (current->flags & PF_MCE_PROCESS) | |
2356 | error = (current->flags & PF_MCE_EARLY) ? | |
2357 | PR_MCE_KILL_EARLY : PR_MCE_KILL_LATE; | |
2358 | else | |
2359 | error = PR_MCE_KILL_DEFAULT; | |
2360 | break; | |
2361 | case PR_SET_MM: | |
2362 | error = prctl_set_mm(arg2, arg3, arg4, arg5); | |
2363 | break; | |
2364 | case PR_GET_TID_ADDRESS: | |
2365 | error = prctl_get_tid_address(me, (int __user **)arg2); | |
2366 | break; | |
2367 | case PR_SET_CHILD_SUBREAPER: | |
2368 | me->signal->is_child_subreaper = !!arg2; | |
749860ce PT |
2369 | if (!arg2) |
2370 | break; | |
2371 | ||
2372 | walk_process_tree(me, propagate_has_child_subreaper, NULL); | |
f3cbd435 AM |
2373 | break; |
2374 | case PR_GET_CHILD_SUBREAPER: | |
2375 | error = put_user(me->signal->is_child_subreaper, | |
2376 | (int __user *)arg2); | |
2377 | break; | |
2378 | case PR_SET_NO_NEW_PRIVS: | |
2379 | if (arg2 != 1 || arg3 || arg4 || arg5) | |
2380 | return -EINVAL; | |
2381 | ||
1d4457f9 | 2382 | task_set_no_new_privs(current); |
f3cbd435 AM |
2383 | break; |
2384 | case PR_GET_NO_NEW_PRIVS: | |
2385 | if (arg2 || arg3 || arg4 || arg5) | |
2386 | return -EINVAL; | |
1d4457f9 | 2387 | return task_no_new_privs(current) ? 1 : 0; |
a0715cc2 AT |
2388 | case PR_GET_THP_DISABLE: |
2389 | if (arg2 || arg3 || arg4 || arg5) | |
2390 | return -EINVAL; | |
18600332 | 2391 | error = !!test_bit(MMF_DISABLE_THP, &me->mm->flags); |
a0715cc2 AT |
2392 | break; |
2393 | case PR_SET_THP_DISABLE: | |
2394 | if (arg3 || arg4 || arg5) | |
2395 | return -EINVAL; | |
17b0573d MH |
2396 | if (down_write_killable(&me->mm->mmap_sem)) |
2397 | return -EINTR; | |
a0715cc2 | 2398 | if (arg2) |
18600332 | 2399 | set_bit(MMF_DISABLE_THP, &me->mm->flags); |
a0715cc2 | 2400 | else |
18600332 | 2401 | clear_bit(MMF_DISABLE_THP, &me->mm->flags); |
a0715cc2 AT |
2402 | up_write(&me->mm->mmap_sem); |
2403 | break; | |
fe3d197f | 2404 | case PR_MPX_ENABLE_MANAGEMENT: |
e9d1b4f3 DH |
2405 | if (arg2 || arg3 || arg4 || arg5) |
2406 | return -EINVAL; | |
46a6e0cf | 2407 | error = MPX_ENABLE_MANAGEMENT(); |
fe3d197f DH |
2408 | break; |
2409 | case PR_MPX_DISABLE_MANAGEMENT: | |
e9d1b4f3 DH |
2410 | if (arg2 || arg3 || arg4 || arg5) |
2411 | return -EINVAL; | |
46a6e0cf | 2412 | error = MPX_DISABLE_MANAGEMENT(); |
fe3d197f | 2413 | break; |
9791554b PB |
2414 | case PR_SET_FP_MODE: |
2415 | error = SET_FP_MODE(me, arg2); | |
2416 | break; | |
2417 | case PR_GET_FP_MODE: | |
2418 | error = GET_FP_MODE(me); | |
2419 | break; | |
2d2123bc DM |
2420 | case PR_SVE_SET_VL: |
2421 | error = SVE_SET_VL(arg2); | |
2422 | break; | |
2423 | case PR_SVE_GET_VL: | |
2424 | error = SVE_GET_VL(); | |
2425 | break; | |
d34cff3e TG |
2426 | case PR_GET_SPECULATION_CTRL: |
2427 | if (arg3 || arg4 || arg5) | |
2428 | return -EINVAL; | |
199bfed2 | 2429 | error = arch_prctl_spec_ctrl_get(me, arg2); |
d34cff3e TG |
2430 | break; |
2431 | case PR_SET_SPECULATION_CTRL: | |
2432 | if (arg4 || arg5) | |
2433 | return -EINVAL; | |
199bfed2 | 2434 | error = arch_prctl_spec_ctrl_set(me, arg2, arg3); |
d34cff3e | 2435 | break; |
f3cbd435 AM |
2436 | default: |
2437 | error = -EINVAL; | |
2438 | break; | |
1da177e4 LT |
2439 | } |
2440 | return error; | |
2441 | } | |
3cfc348b | 2442 | |
836f92ad HC |
2443 | SYSCALL_DEFINE3(getcpu, unsigned __user *, cpup, unsigned __user *, nodep, |
2444 | struct getcpu_cache __user *, unused) | |
3cfc348b AK |
2445 | { |
2446 | int err = 0; | |
2447 | int cpu = raw_smp_processor_id(); | |
ec94fc3d | 2448 | |
3cfc348b AK |
2449 | if (cpup) |
2450 | err |= put_user(cpu, cpup); | |
2451 | if (nodep) | |
2452 | err |= put_user(cpu_to_node(cpu), nodep); | |
3cfc348b AK |
2453 | return err ? -EFAULT : 0; |
2454 | } | |
10a0a8d4 | 2455 | |
4a22f166 SR |
2456 | /** |
2457 | * do_sysinfo - fill in sysinfo struct | |
2458 | * @info: pointer to buffer to fill | |
2459 | */ | |
2460 | static int do_sysinfo(struct sysinfo *info) | |
2461 | { | |
2462 | unsigned long mem_total, sav_total; | |
2463 | unsigned int mem_unit, bitcount; | |
2464 | struct timespec tp; | |
2465 | ||
2466 | memset(info, 0, sizeof(struct sysinfo)); | |
2467 | ||
45c64940 | 2468 | get_monotonic_boottime(&tp); |
4a22f166 SR |
2469 | info->uptime = tp.tv_sec + (tp.tv_nsec ? 1 : 0); |
2470 | ||
2471 | get_avenrun(info->loads, 0, SI_LOAD_SHIFT - FSHIFT); | |
2472 | ||
2473 | info->procs = nr_threads; | |
2474 | ||
2475 | si_meminfo(info); | |
2476 | si_swapinfo(info); | |
2477 | ||
2478 | /* | |
2479 | * If the sum of all the available memory (i.e. ram + swap) | |
2480 | * is less than can be stored in a 32 bit unsigned long then | |
2481 | * we can be binary compatible with 2.2.x kernels. If not, | |
2482 | * well, in that case 2.2.x was broken anyways... | |
2483 | * | |
2484 | * -Erik Andersen <andersee@debian.org> | |
2485 | */ | |
2486 | ||
2487 | mem_total = info->totalram + info->totalswap; | |
2488 | if (mem_total < info->totalram || mem_total < info->totalswap) | |
2489 | goto out; | |
2490 | bitcount = 0; | |
2491 | mem_unit = info->mem_unit; | |
2492 | while (mem_unit > 1) { | |
2493 | bitcount++; | |
2494 | mem_unit >>= 1; | |
2495 | sav_total = mem_total; | |
2496 | mem_total <<= 1; | |
2497 | if (mem_total < sav_total) | |
2498 | goto out; | |
2499 | } | |
2500 | ||
2501 | /* | |
2502 | * If mem_total did not overflow, multiply all memory values by | |
2503 | * info->mem_unit and set it to 1. This leaves things compatible | |
2504 | * with 2.2.x, and also retains compatibility with earlier 2.4.x | |
2505 | * kernels... | |
2506 | */ | |
2507 | ||
2508 | info->mem_unit = 1; | |
2509 | info->totalram <<= bitcount; | |
2510 | info->freeram <<= bitcount; | |
2511 | info->sharedram <<= bitcount; | |
2512 | info->bufferram <<= bitcount; | |
2513 | info->totalswap <<= bitcount; | |
2514 | info->freeswap <<= bitcount; | |
2515 | info->totalhigh <<= bitcount; | |
2516 | info->freehigh <<= bitcount; | |
2517 | ||
2518 | out: | |
2519 | return 0; | |
2520 | } | |
2521 | ||
2522 | SYSCALL_DEFINE1(sysinfo, struct sysinfo __user *, info) | |
2523 | { | |
2524 | struct sysinfo val; | |
2525 | ||
2526 | do_sysinfo(&val); | |
2527 | ||
2528 | if (copy_to_user(info, &val, sizeof(struct sysinfo))) | |
2529 | return -EFAULT; | |
2530 | ||
2531 | return 0; | |
2532 | } | |
2533 | ||
2534 | #ifdef CONFIG_COMPAT | |
2535 | struct compat_sysinfo { | |
2536 | s32 uptime; | |
2537 | u32 loads[3]; | |
2538 | u32 totalram; | |
2539 | u32 freeram; | |
2540 | u32 sharedram; | |
2541 | u32 bufferram; | |
2542 | u32 totalswap; | |
2543 | u32 freeswap; | |
2544 | u16 procs; | |
2545 | u16 pad; | |
2546 | u32 totalhigh; | |
2547 | u32 freehigh; | |
2548 | u32 mem_unit; | |
2549 | char _f[20-2*sizeof(u32)-sizeof(int)]; | |
2550 | }; | |
2551 | ||
2552 | COMPAT_SYSCALL_DEFINE1(sysinfo, struct compat_sysinfo __user *, info) | |
2553 | { | |
2554 | struct sysinfo s; | |
2555 | ||
2556 | do_sysinfo(&s); | |
2557 | ||
2558 | /* Check to see if any memory value is too large for 32-bit and scale | |
2559 | * down if needed | |
2560 | */ | |
0baae41e | 2561 | if (upper_32_bits(s.totalram) || upper_32_bits(s.totalswap)) { |
4a22f166 SR |
2562 | int bitcount = 0; |
2563 | ||
2564 | while (s.mem_unit < PAGE_SIZE) { | |
2565 | s.mem_unit <<= 1; | |
2566 | bitcount++; | |
2567 | } | |
2568 | ||
2569 | s.totalram >>= bitcount; | |
2570 | s.freeram >>= bitcount; | |
2571 | s.sharedram >>= bitcount; | |
2572 | s.bufferram >>= bitcount; | |
2573 | s.totalswap >>= bitcount; | |
2574 | s.freeswap >>= bitcount; | |
2575 | s.totalhigh >>= bitcount; | |
2576 | s.freehigh >>= bitcount; | |
2577 | } | |
2578 | ||
2579 | if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) || | |
2580 | __put_user(s.uptime, &info->uptime) || | |
2581 | __put_user(s.loads[0], &info->loads[0]) || | |
2582 | __put_user(s.loads[1], &info->loads[1]) || | |
2583 | __put_user(s.loads[2], &info->loads[2]) || | |
2584 | __put_user(s.totalram, &info->totalram) || | |
2585 | __put_user(s.freeram, &info->freeram) || | |
2586 | __put_user(s.sharedram, &info->sharedram) || | |
2587 | __put_user(s.bufferram, &info->bufferram) || | |
2588 | __put_user(s.totalswap, &info->totalswap) || | |
2589 | __put_user(s.freeswap, &info->freeswap) || | |
2590 | __put_user(s.procs, &info->procs) || | |
2591 | __put_user(s.totalhigh, &info->totalhigh) || | |
2592 | __put_user(s.freehigh, &info->freehigh) || | |
2593 | __put_user(s.mem_unit, &info->mem_unit)) | |
2594 | return -EFAULT; | |
2595 | ||
2596 | return 0; | |
2597 | } | |
2598 | #endif /* CONFIG_COMPAT */ |