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am437x-vpfe: always assign bpp variable
[GitHub/exynos8895/android_kernel_samsung_universal8895.git] / kernel / sys.c
CommitLineData
1da177e4
LT		 1/*
2 * linux/kernel/sys.c
3 *
4 * Copyright (C) 1991, 1992 Linus Torvalds
5 */
6
9984de1a 7#include <linux/export.h>
1da177e4
LT		 8#include <linux/mm.h>
9#include <linux/utsname.h>
10#include <linux/mman.h>
1da177e4
LT		 11#include <linux/reboot.h>
12#include <linux/prctl.h>
1da177e4
LT		 13#include <linux/highuid.h>
14#include <linux/fs.h>
74da1ff7 15#include <linux/kmod.h>
cdd6c482 16#include <linux/perf_event.h>
3e88c553 17#include <linux/resource.h>
dc009d92 18#include <linux/kernel.h>
1da177e4 19#include <linux/workqueue.h>
c59ede7b 20#include <linux/capability.h>
1da177e4
LT		 21#include <linux/device.h>
22#include <linux/key.h>
23#include <linux/times.h>
24#include <linux/posix-timers.h>
25#include <linux/security.h>
26#include <linux/dcookies.h>
27#include <linux/suspend.h>
28#include <linux/tty.h>
7ed20e1a 29#include <linux/signal.h>
9f46080c 30#include <linux/cn_proc.h>
3cfc348b 31#include <linux/getcpu.h>
6eaeeaba 32#include <linux/task_io_accounting_ops.h>
1d9d02fe 33#include <linux/seccomp.h>
4047727e 34#include <linux/cpu.h>
e28cbf22 35#include <linux/personality.h>
e3d5a27d 36#include <linux/ptrace.h>
5ad4e53b 37#include <linux/fs_struct.h>
b32dfe37
CG		 38#include <linux/file.h>
39#include <linux/mount.h>
5a0e3ad6 40#include <linux/gfp.h>
40dc166c 41#include <linux/syscore_ops.h>
be27425d
AK		 42#include <linux/version.h>
43#include <linux/ctype.h>
586278d7
CC		 44#include <linux/mm.h>
45#include <linux/mempolicy.h>
1da177e4
LT		 46
47#include <linux/compat.h>
48#include <linux/syscalls.h>
00d7c05a 49#include <linux/kprobes.h>
acce292c 50#include <linux/user_namespace.h>
7fe5e042 51#include <linux/binfmts.h>
1da177e4 52
4a22f166
SR		 53#include <linux/sched.h>
54#include <linux/rcupdate.h>
55#include <linux/uidgid.h>
56#include <linux/cred.h>
57
04c6862c 58#include <linux/kmsg_dump.h>
be27425d
AK		 59/* Move somewhere else to avoid recompiling? */
60#include <generated/utsrelease.h>
04c6862c 61
1da177e4
LT		 62#include <asm/uaccess.h>
63#include <asm/io.h>
64#include <asm/unistd.h>
65
66#ifndef SET_UNALIGN_CTL
ec94fc3d 67# define SET_UNALIGN_CTL(a, b) (-EINVAL)
1da177e4
LT		 68#endif
69#ifndef GET_UNALIGN_CTL
ec94fc3d 70# define GET_UNALIGN_CTL(a, b) (-EINVAL)
1da177e4
LT		 71#endif
72#ifndef SET_FPEMU_CTL
ec94fc3d 73# define SET_FPEMU_CTL(a, b) (-EINVAL)
1da177e4
LT		 74#endif
75#ifndef GET_FPEMU_CTL
ec94fc3d 76# define GET_FPEMU_CTL(a, b) (-EINVAL)
1da177e4
LT		 77#endif
78#ifndef SET_FPEXC_CTL
ec94fc3d 79# define SET_FPEXC_CTL(a, b) (-EINVAL)
1da177e4
LT		 80#endif
81#ifndef GET_FPEXC_CTL
ec94fc3d 82# define GET_FPEXC_CTL(a, b) (-EINVAL)
1da177e4 83#endif
651d765d 84#ifndef GET_ENDIAN
ec94fc3d 85# define GET_ENDIAN(a, b) (-EINVAL)
651d765d
AB		 86#endif
87#ifndef SET_ENDIAN
ec94fc3d 88# define SET_ENDIAN(a, b) (-EINVAL)
651d765d 89#endif
8fb402bc
EB		 90#ifndef GET_TSC_CTL
91# define GET_TSC_CTL(a) (-EINVAL)
92#endif
93#ifndef SET_TSC_CTL
94# define SET_TSC_CTL(a) (-EINVAL)
95#endif
fe3d197f 96#ifndef MPX_ENABLE_MANAGEMENT
46a6e0cf 97# define MPX_ENABLE_MANAGEMENT() (-EINVAL)
fe3d197f
DH		 98#endif
99#ifndef MPX_DISABLE_MANAGEMENT
46a6e0cf 100# define MPX_DISABLE_MANAGEMENT() (-EINVAL)
fe3d197f 101#endif
9791554b
PB		 102#ifndef GET_FP_MODE
103# define GET_FP_MODE(a) (-EINVAL)
104#endif
105#ifndef SET_FP_MODE
106# define SET_FP_MODE(a,b) (-EINVAL)
107#endif
1da177e4
LT		 108
109/*
110 * this is where the system-wide overflow UID and GID are defined, for
111 * architectures that now have 32-bit UID/GID but didn't in the past
112 */
113
114int overflowuid = DEFAULT_OVERFLOWUID;
115int overflowgid = DEFAULT_OVERFLOWGID;
116
1da177e4
LT		 117EXPORT_SYMBOL(overflowuid);
118EXPORT_SYMBOL(overflowgid);
1da177e4
LT		 119
120/*
121 * the same as above, but for filesystems which can only store a 16-bit
122 * UID and GID. as such, this is needed on all architectures
123 */
124
125int fs_overflowuid = DEFAULT_FS_OVERFLOWUID;
126int fs_overflowgid = DEFAULT_FS_OVERFLOWUID;
127
128EXPORT_SYMBOL(fs_overflowuid);
129EXPORT_SYMBOL(fs_overflowgid);
130
fc832ad3
SH		 131/*
132 * Returns true if current's euid is same as p's uid or euid,
133 * or has CAP_SYS_NICE to p's user_ns.
134 *
135 * Called with rcu_read_lock, creds are safe
136 */
137static bool set_one_prio_perm(struct task_struct *p)
138{
139 const struct cred *cred = current_cred(), *pcred = __task_cred(p);
140
5af66203
EB		 141 if (uid_eq(pcred->uid, cred->euid) ||
142 uid_eq(pcred->euid, cred->euid))
fc832ad3 143 return true;
c4a4d603 144 if (ns_capable(pcred->user_ns, CAP_SYS_NICE))
fc832ad3
SH		 145 return true;
146 return false;
147}
148
c69e8d9c
DH		 149/*
150 * set the priority of a task
151 * - the caller must hold the RCU read lock
152 */
1da177e4
LT		 153static int set_one_prio(struct task_struct *p, int niceval, int error)
154{
155 int no_nice;
156
fc832ad3 157 if (!set_one_prio_perm(p)) {
1da177e4
LT		 158 error = -EPERM;
159 goto out;
160 }
e43379f1 161 if (niceval < task_nice(p) && !can_nice(p, niceval)) {
1da177e4
LT		 162 error = -EACCES;
163 goto out;
164 }
165 no_nice = security_task_setnice(p, niceval);
166 if (no_nice) {
167 error = no_nice;
168 goto out;
169 }
170 if (error == -ESRCH)
171 error = 0;
172 set_user_nice(p, niceval);
173out:
174 return error;
175}
176
754fe8d2 177SYSCALL_DEFINE3(setpriority, int, which, int, who, int, niceval)
1da177e4
LT		 178{
179 struct task_struct *g, *p;
180 struct user_struct *user;
86a264ab 181 const struct cred *cred = current_cred();
1da177e4 182 int error = -EINVAL;
41487c65 183 struct pid *pgrp;
7b44ab97 184 kuid_t uid;
1da177e4 185
3e88c553 186 if (which > PRIO_USER || which < PRIO_PROCESS)
1da177e4
LT		 187 goto out;
188
189 /* normalize: avoid signed division (rounding problems) */
190 error = -ESRCH;
c4a4d2f4
DY		 191 if (niceval < MIN_NICE)
192 niceval = MIN_NICE;
193 if (niceval > MAX_NICE)
194 niceval = MAX_NICE;
1da177e4 195
d4581a23 196 rcu_read_lock();
1da177e4
LT		 197 read_lock(&tasklist_lock);
198 switch (which) {
ec94fc3d 199 case PRIO_PROCESS:
200 if (who)
201 p = find_task_by_vpid(who);
202 else
203 p = current;
204 if (p)
205 error = set_one_prio(p, niceval, error);
206 break;
207 case PRIO_PGRP:
208 if (who)
209 pgrp = find_vpid(who);
210 else
211 pgrp = task_pgrp(current);
212 do_each_pid_thread(pgrp, PIDTYPE_PGID, p) {
213 error = set_one_prio(p, niceval, error);
214 } while_each_pid_thread(pgrp, PIDTYPE_PGID, p);
215 break;
216 case PRIO_USER:
217 uid = make_kuid(cred->user_ns, who);
218 user = cred->user;
219 if (!who)
220 uid = cred->uid;
221 else if (!uid_eq(uid, cred->uid)) {
222 user = find_user(uid);
223 if (!user)
86a264ab 224 goto out_unlock; /* No processes for this user */
ec94fc3d 225 }
226 do_each_thread(g, p) {
8639b461 227 if (uid_eq(task_uid(p), uid) && task_pid_vnr(p))
ec94fc3d 228 error = set_one_prio(p, niceval, error);
229 } while_each_thread(g, p);
230 if (!uid_eq(uid, cred->uid))
231 free_uid(user); /* For find_user() */
232 break;
1da177e4
LT		 233 }
234out_unlock:
235 read_unlock(&tasklist_lock);
d4581a23 236 rcu_read_unlock();
1da177e4
LT		 237out:
238 return error;
239}
240
241/*
242 * Ugh. To avoid negative return values, "getpriority()" will
243 * not return the normal nice-value, but a negated value that
244 * has been offset by 20 (ie it returns 40..1 instead of -20..19)
245 * to stay compatible.
246 */
754fe8d2 247SYSCALL_DEFINE2(getpriority, int, which, int, who)
1da177e4
LT		 248{
249 struct task_struct *g, *p;
250 struct user_struct *user;
86a264ab 251 const struct cred *cred = current_cred();
1da177e4 252 long niceval, retval = -ESRCH;
41487c65 253 struct pid *pgrp;
7b44ab97 254 kuid_t uid;
1da177e4 255
3e88c553 256 if (which > PRIO_USER || which < PRIO_PROCESS)
1da177e4
LT		 257 return -EINVAL;
258
70118837 259 rcu_read_lock();
1da177e4
LT		 260 read_lock(&tasklist_lock);
261 switch (which) {
ec94fc3d 262 case PRIO_PROCESS:
263 if (who)
264 p = find_task_by_vpid(who);
265 else
266 p = current;
267 if (p) {
268 niceval = nice_to_rlimit(task_nice(p));
269 if (niceval > retval)
270 retval = niceval;
271 }
272 break;
273 case PRIO_PGRP:
274 if (who)
275 pgrp = find_vpid(who);
276 else
277 pgrp = task_pgrp(current);
278 do_each_pid_thread(pgrp, PIDTYPE_PGID, p) {
279 niceval = nice_to_rlimit(task_nice(p));
280 if (niceval > retval)
281 retval = niceval;
282 } while_each_pid_thread(pgrp, PIDTYPE_PGID, p);
283 break;
284 case PRIO_USER:
285 uid = make_kuid(cred->user_ns, who);
286 user = cred->user;
287 if (!who)
288 uid = cred->uid;
289 else if (!uid_eq(uid, cred->uid)) {
290 user = find_user(uid);
291 if (!user)
292 goto out_unlock; /* No processes for this user */
293 }
294 do_each_thread(g, p) {
8639b461 295 if (uid_eq(task_uid(p), uid) && task_pid_vnr(p)) {
7aa2c016 296 niceval = nice_to_rlimit(task_nice(p));
1da177e4
LT		 297 if (niceval > retval)
298 retval = niceval;
299 }
ec94fc3d 300 } while_each_thread(g, p);
301 if (!uid_eq(uid, cred->uid))
302 free_uid(user); /* for find_user() */
303 break;
1da177e4
LT		 304 }
305out_unlock:
306 read_unlock(&tasklist_lock);
70118837 307 rcu_read_unlock();
1da177e4
LT		 308
309 return retval;
310}
311
1da177e4
LT		 312/*
313 * Unprivileged users may change the real gid to the effective gid
314 * or vice versa. (BSD-style)
315 *
316 * If you set the real gid at all, or set the effective gid to a value not
317 * equal to the real gid, then the saved gid is set to the new effective gid.
318 *
319 * This makes it possible for a setgid program to completely drop its
320 * privileges, which is often a useful assertion to make when you are doing
321 * a security audit over a program.
322 *
323 * The general idea is that a program which uses just setregid() will be
324 * 100% compatible with BSD. A program which uses just setgid() will be
ec94fc3d 325 * 100% compatible with POSIX with saved IDs.
1da177e4
LT		 326 *
327 * SMP: There are not races, the GIDs are checked only by filesystem
328 * operations (as far as semantic preservation is concerned).
329 */
2813893f 330#ifdef CONFIG_MULTIUSER
ae1251ab 331SYSCALL_DEFINE2(setregid, gid_t, rgid, gid_t, egid)
1da177e4 332{
a29c33f4 333 struct user_namespace *ns = current_user_ns();
d84f4f99
DH		 334 const struct cred *old;
335 struct cred *new;
1da177e4 336 int retval;
a29c33f4
EB		 337 kgid_t krgid, kegid;
338
339 krgid = make_kgid(ns, rgid);
340 kegid = make_kgid(ns, egid);
341
342 if ((rgid != (gid_t) -1) && !gid_valid(krgid))
343 return -EINVAL;
344 if ((egid != (gid_t) -1) && !gid_valid(kegid))
345 return -EINVAL;
1da177e4 346
d84f4f99
DH		 347 new = prepare_creds();
348 if (!new)
349 return -ENOMEM;
350 old = current_cred();
351
d84f4f99 352 retval = -EPERM;
1da177e4 353 if (rgid != (gid_t) -1) {
a29c33f4
EB		 354 if (gid_eq(old->gid, krgid) ||
355 gid_eq(old->egid, krgid) ||
c7b96acf 356 ns_capable(old->user_ns, CAP_SETGID))
a29c33f4 357 new->gid = krgid;
1da177e4 358 else
d84f4f99 359 goto error;
1da177e4
LT		 360 }
361 if (egid != (gid_t) -1) {
a29c33f4
EB		 362 if (gid_eq(old->gid, kegid) ||
363 gid_eq(old->egid, kegid) ||
364 gid_eq(old->sgid, kegid) ||
c7b96acf 365 ns_capable(old->user_ns, CAP_SETGID))
a29c33f4 366 new->egid = kegid;
756184b7 367 else
d84f4f99 368 goto error;
1da177e4 369 }
d84f4f99 370
1da177e4 371 if (rgid != (gid_t) -1 ||
a29c33f4 372 (egid != (gid_t) -1 && !gid_eq(kegid, old->gid)))
d84f4f99
DH		 373 new->sgid = new->egid;
374 new->fsgid = new->egid;
375
376 return commit_creds(new);
377
378error:
379 abort_creds(new);
380 return retval;
1da177e4
LT		 381}
382
383/*
ec94fc3d 384 * setgid() is implemented like SysV w/ SAVED_IDS
1da177e4
LT		 385 *
386 * SMP: Same implicit races as above.
387 */
ae1251ab 388SYSCALL_DEFINE1(setgid, gid_t, gid)
1da177e4 389{
a29c33f4 390 struct user_namespace *ns = current_user_ns();
d84f4f99
DH		 391 const struct cred *old;
392 struct cred *new;
1da177e4 393 int retval;
a29c33f4
EB		 394 kgid_t kgid;
395
396 kgid = make_kgid(ns, gid);
397 if (!gid_valid(kgid))
398 return -EINVAL;
1da177e4 399
d84f4f99
DH		 400 new = prepare_creds();
401 if (!new)
402 return -ENOMEM;
403 old = current_cred();
404
d84f4f99 405 retval = -EPERM;
c7b96acf 406 if (ns_capable(old->user_ns, CAP_SETGID))
a29c33f4
EB		 407 new->gid = new->egid = new->sgid = new->fsgid = kgid;
408 else if (gid_eq(kgid, old->gid) || gid_eq(kgid, old->sgid))
409 new->egid = new->fsgid = kgid;
1da177e4 410 else
d84f4f99 411 goto error;
1da177e4 412
d84f4f99
DH		 413 return commit_creds(new);
414
415error:
416 abort_creds(new);
417 return retval;
1da177e4 418}
54e99124 419
d84f4f99
DH		 420/*
421 * change the user struct in a credentials set to match the new UID
422 */
423static int set_user(struct cred *new)
1da177e4
LT		 424{
425 struct user_struct *new_user;
426
078de5f7 427 new_user = alloc_uid(new->uid);
1da177e4
LT		 428 if (!new_user)
429 return -EAGAIN;
430
72fa5997
VK		 431 /*
432 * We don't fail in case of NPROC limit excess here because too many
433 * poorly written programs don't check set*uid() return code, assuming
434 * it never fails if called by root. We may still enforce NPROC limit
435 * for programs doing set*uid()+execve() by harmlessly deferring the
436 * failure to the execve() stage.
437 */
78d7d407 438 if (atomic_read(&new_user->processes) >= rlimit(RLIMIT_NPROC) &&
72fa5997
VK		 439 new_user != INIT_USER)
440 current->flags |= PF_NPROC_EXCEEDED;
441 else
442 current->flags &= ~PF_NPROC_EXCEEDED;
1da177e4 443
d84f4f99
DH		 444 free_uid(new->user);
445 new->user = new_user;
1da177e4
LT		 446 return 0;
447}
448
449/*
450 * Unprivileged users may change the real uid to the effective uid
451 * or vice versa. (BSD-style)
452 *
453 * If you set the real uid at all, or set the effective uid to a value not
454 * equal to the real uid, then the saved uid is set to the new effective uid.
455 *
456 * This makes it possible for a setuid program to completely drop its
457 * privileges, which is often a useful assertion to make when you are doing
458 * a security audit over a program.
459 *
460 * The general idea is that a program which uses just setreuid() will be
461 * 100% compatible with BSD. A program which uses just setuid() will be
ec94fc3d 462 * 100% compatible with POSIX with saved IDs.
1da177e4 463 */
ae1251ab 464SYSCALL_DEFINE2(setreuid, uid_t, ruid, uid_t, euid)
1da177e4 465{
a29c33f4 466 struct user_namespace *ns = current_user_ns();
d84f4f99
DH		 467 const struct cred *old;
468 struct cred *new;
1da177e4 469 int retval;
a29c33f4
EB		 470 kuid_t kruid, keuid;
471
472 kruid = make_kuid(ns, ruid);
473 keuid = make_kuid(ns, euid);
474
475 if ((ruid != (uid_t) -1) && !uid_valid(kruid))
476 return -EINVAL;
477 if ((euid != (uid_t) -1) && !uid_valid(keuid))
478 return -EINVAL;
1da177e4 479
d84f4f99
DH		 480 new = prepare_creds();
481 if (!new)
482 return -ENOMEM;
483 old = current_cred();
484
d84f4f99 485 retval = -EPERM;
1da177e4 486 if (ruid != (uid_t) -1) {
a29c33f4
EB		 487 new->uid = kruid;
488 if (!uid_eq(old->uid, kruid) &&
489 !uid_eq(old->euid, kruid) &&
c7b96acf 490 !ns_capable(old->user_ns, CAP_SETUID))
d84f4f99 491 goto error;
1da177e4
LT		 492 }
493
494 if (euid != (uid_t) -1) {
a29c33f4
EB		 495 new->euid = keuid;
496 if (!uid_eq(old->uid, keuid) &&
497 !uid_eq(old->euid, keuid) &&
498 !uid_eq(old->suid, keuid) &&
c7b96acf 499 !ns_capable(old->user_ns, CAP_SETUID))
d84f4f99 500 goto error;
1da177e4
LT		 501 }
502
a29c33f4 503 if (!uid_eq(new->uid, old->uid)) {
54e99124
DG		 504 retval = set_user(new);
505 if (retval < 0)
506 goto error;
507 }
1da177e4 508 if (ruid != (uid_t) -1 ||
a29c33f4 509 (euid != (uid_t) -1 && !uid_eq(keuid, old->uid)))
d84f4f99
DH		 510 new->suid = new->euid;
511 new->fsuid = new->euid;
1da177e4 512
d84f4f99
DH		 513 retval = security_task_fix_setuid(new, old, LSM_SETID_RE);
514 if (retval < 0)
515 goto error;
1da177e4 516
d84f4f99 517 return commit_creds(new);
1da177e4 518
d84f4f99
DH		 519error:
520 abort_creds(new);
521 return retval;
522}
ec94fc3d 523
1da177e4 524/*
ec94fc3d 525 * setuid() is implemented like SysV with SAVED_IDS
526 *
1da177e4 527 * Note that SAVED_ID's is deficient in that a setuid root program
ec94fc3d 528 * like sendmail, for example, cannot set its uid to be a normal
1da177e4
LT		 529 * user and then switch back, because if you're root, setuid() sets
530 * the saved uid too. If you don't like this, blame the bright people
531 * in the POSIX committee and/or USG. Note that the BSD-style setreuid()
532 * will allow a root program to temporarily drop privileges and be able to
ec94fc3d 533 * regain them by swapping the real and effective uid.
1da177e4 534 */
ae1251ab 535SYSCALL_DEFINE1(setuid, uid_t, uid)
1da177e4 536{
a29c33f4 537 struct user_namespace *ns = current_user_ns();
d84f4f99
DH		 538 const struct cred *old;
539 struct cred *new;
1da177e4 540 int retval;
a29c33f4
EB		 541 kuid_t kuid;
542
543 kuid = make_kuid(ns, uid);
544 if (!uid_valid(kuid))
545 return -EINVAL;
1da177e4 546
d84f4f99
DH		 547 new = prepare_creds();
548 if (!new)
549 return -ENOMEM;
550 old = current_cred();
551
d84f4f99 552 retval = -EPERM;
c7b96acf 553 if (ns_capable(old->user_ns, CAP_SETUID)) {
a29c33f4
EB		 554 new->suid = new->uid = kuid;
555 if (!uid_eq(kuid, old->uid)) {
54e99124
DG		 556 retval = set_user(new);
557 if (retval < 0)
558 goto error;
d84f4f99 559 }
a29c33f4 560 } else if (!uid_eq(kuid, old->uid) && !uid_eq(kuid, new->suid)) {
d84f4f99 561 goto error;
1da177e4 562 }
1da177e4 563
a29c33f4 564 new->fsuid = new->euid = kuid;
d84f4f99
DH		 565
566 retval = security_task_fix_setuid(new, old, LSM_SETID_ID);
567 if (retval < 0)
568 goto error;
1da177e4 569
d84f4f99 570 return commit_creds(new);
1da177e4 571
d84f4f99
DH		 572error:
573 abort_creds(new);
574 return retval;
1da177e4
LT		 575}
576
577
578/*
579 * This function implements a generic ability to update ruid, euid,
580 * and suid. This allows you to implement the 4.4 compatible seteuid().
581 */
ae1251ab 582SYSCALL_DEFINE3(setresuid, uid_t, ruid, uid_t, euid, uid_t, suid)
1da177e4 583{
a29c33f4 584 struct user_namespace *ns = current_user_ns();
d84f4f99
DH		 585 const struct cred *old;
586 struct cred *new;
1da177e4 587 int retval;
a29c33f4
EB		 588 kuid_t kruid, keuid, ksuid;
589
590 kruid = make_kuid(ns, ruid);
591 keuid = make_kuid(ns, euid);
592 ksuid = make_kuid(ns, suid);
593
594 if ((ruid != (uid_t) -1) && !uid_valid(kruid))
595 return -EINVAL;
596
597 if ((euid != (uid_t) -1) && !uid_valid(keuid))
598 return -EINVAL;
599
600 if ((suid != (uid_t) -1) && !uid_valid(ksuid))
601 return -EINVAL;
1da177e4 602
d84f4f99
DH		 603 new = prepare_creds();
604 if (!new)
605 return -ENOMEM;
606
d84f4f99 607 old = current_cred();
1da177e4 608
d84f4f99 609 retval = -EPERM;
c7b96acf 610 if (!ns_capable(old->user_ns, CAP_SETUID)) {
a29c33f4
EB		 611 if (ruid != (uid_t) -1 && !uid_eq(kruid, old->uid) &&
612 !uid_eq(kruid, old->euid) && !uid_eq(kruid, old->suid))
d84f4f99 613 goto error;
a29c33f4
EB		 614 if (euid != (uid_t) -1 && !uid_eq(keuid, old->uid) &&
615 !uid_eq(keuid, old->euid) && !uid_eq(keuid, old->suid))
d84f4f99 616 goto error;
a29c33f4
EB		 617 if (suid != (uid_t) -1 && !uid_eq(ksuid, old->uid) &&
618 !uid_eq(ksuid, old->euid) && !uid_eq(ksuid, old->suid))
d84f4f99 619 goto error;
1da177e4 620 }
d84f4f99 621
1da177e4 622 if (ruid != (uid_t) -1) {
a29c33f4
EB		 623 new->uid = kruid;
624 if (!uid_eq(kruid, old->uid)) {
54e99124
DG		 625 retval = set_user(new);
626 if (retval < 0)
627 goto error;
628 }
1da177e4 629 }
d84f4f99 630 if (euid != (uid_t) -1)
a29c33f4 631 new->euid = keuid;
1da177e4 632 if (suid != (uid_t) -1)
a29c33f4 633 new->suid = ksuid;
d84f4f99 634 new->fsuid = new->euid;
1da177e4 635
d84f4f99
DH		 636 retval = security_task_fix_setuid(new, old, LSM_SETID_RES);
637 if (retval < 0)
638 goto error;
1da177e4 639
d84f4f99 640 return commit_creds(new);
1da177e4 641
d84f4f99
DH		 642error:
643 abort_creds(new);
644 return retval;
1da177e4
LT		 645}
646
a29c33f4 647SYSCALL_DEFINE3(getresuid, uid_t __user *, ruidp, uid_t __user *, euidp, uid_t __user *, suidp)
1da177e4 648{
86a264ab 649 const struct cred *cred = current_cred();
1da177e4 650 int retval;
a29c33f4
EB		 651 uid_t ruid, euid, suid;
652
653 ruid = from_kuid_munged(cred->user_ns, cred->uid);
654 euid = from_kuid_munged(cred->user_ns, cred->euid);
655 suid = from_kuid_munged(cred->user_ns, cred->suid);
1da177e4 656
ec94fc3d 657 retval = put_user(ruid, ruidp);
658 if (!retval) {
659 retval = put_user(euid, euidp);
660 if (!retval)
661 return put_user(suid, suidp);
662 }
1da177e4
LT		 663 return retval;
664}
665
666/*
667 * Same as above, but for rgid, egid, sgid.
668 */
ae1251ab 669SYSCALL_DEFINE3(setresgid, gid_t, rgid, gid_t, egid, gid_t, sgid)
1da177e4 670{
a29c33f4 671 struct user_namespace *ns = current_user_ns();
d84f4f99
DH		 672 const struct cred *old;
673 struct cred *new;
1da177e4 674 int retval;
a29c33f4
EB		 675 kgid_t krgid, kegid, ksgid;
676
677 krgid = make_kgid(ns, rgid);
678 kegid = make_kgid(ns, egid);
679 ksgid = make_kgid(ns, sgid);
680
681 if ((rgid != (gid_t) -1) && !gid_valid(krgid))
682 return -EINVAL;
683 if ((egid != (gid_t) -1) && !gid_valid(kegid))
684 return -EINVAL;
685 if ((sgid != (gid_t) -1) && !gid_valid(ksgid))
686 return -EINVAL;
1da177e4 687
d84f4f99
DH		 688 new = prepare_creds();
689 if (!new)
690 return -ENOMEM;
691 old = current_cred();
692
d84f4f99 693 retval = -EPERM;
c7b96acf 694 if (!ns_capable(old->user_ns, CAP_SETGID)) {
a29c33f4
EB		 695 if (rgid != (gid_t) -1 && !gid_eq(krgid, old->gid) &&
696 !gid_eq(krgid, old->egid) && !gid_eq(krgid, old->sgid))
d84f4f99 697 goto error;
a29c33f4
EB		 698 if (egid != (gid_t) -1 && !gid_eq(kegid, old->gid) &&
699 !gid_eq(kegid, old->egid) && !gid_eq(kegid, old->sgid))
d84f4f99 700 goto error;
a29c33f4
EB		 701 if (sgid != (gid_t) -1 && !gid_eq(ksgid, old->gid) &&
702 !gid_eq(ksgid, old->egid) && !gid_eq(ksgid, old->sgid))
d84f4f99 703 goto error;
1da177e4 704 }
d84f4f99 705
1da177e4 706 if (rgid != (gid_t) -1)
a29c33f4 707 new->gid = krgid;
d84f4f99 708 if (egid != (gid_t) -1)
a29c33f4 709 new->egid = kegid;
1da177e4 710 if (sgid != (gid_t) -1)
a29c33f4 711 new->sgid = ksgid;
d84f4f99 712 new->fsgid = new->egid;
1da177e4 713
d84f4f99
DH		 714 return commit_creds(new);
715
716error:
717 abort_creds(new);
718 return retval;
1da177e4
LT		 719}
720
a29c33f4 721SYSCALL_DEFINE3(getresgid, gid_t __user *, rgidp, gid_t __user *, egidp, gid_t __user *, sgidp)
1da177e4 722{
86a264ab 723 const struct cred *cred = current_cred();
1da177e4 724 int retval;
a29c33f4
EB		 725 gid_t rgid, egid, sgid;
726
727 rgid = from_kgid_munged(cred->user_ns, cred->gid);
728 egid = from_kgid_munged(cred->user_ns, cred->egid);
729 sgid = from_kgid_munged(cred->user_ns, cred->sgid);
1da177e4 730
ec94fc3d 731 retval = put_user(rgid, rgidp);
732 if (!retval) {
733 retval = put_user(egid, egidp);
734 if (!retval)
735 retval = put_user(sgid, sgidp);
736 }
1da177e4
LT		 737
738 return retval;
739}
740
741
742/*
743 * "setfsuid()" sets the fsuid - the uid used for filesystem checks. This
744 * is used for "access()" and for the NFS daemon (letting nfsd stay at
745 * whatever uid it wants to). It normally shadows "euid", except when
746 * explicitly set by setfsuid() or for access..
747 */
ae1251ab 748SYSCALL_DEFINE1(setfsuid, uid_t, uid)
1da177e4 749{
d84f4f99
DH		 750 const struct cred *old;
751 struct cred *new;
752 uid_t old_fsuid;
a29c33f4
EB		 753 kuid_t kuid;
754
755 old = current_cred();
756 old_fsuid = from_kuid_munged(old->user_ns, old->fsuid);
757
758 kuid = make_kuid(old->user_ns, uid);
759 if (!uid_valid(kuid))
760 return old_fsuid;
1da177e4 761
d84f4f99
DH		 762 new = prepare_creds();
763 if (!new)
a29c33f4 764 return old_fsuid;
1da177e4 765
a29c33f4
EB		 766 if (uid_eq(kuid, old->uid) || uid_eq(kuid, old->euid) ||
767 uid_eq(kuid, old->suid) || uid_eq(kuid, old->fsuid) ||
c7b96acf 768 ns_capable(old->user_ns, CAP_SETUID)) {
a29c33f4
EB		 769 if (!uid_eq(kuid, old->fsuid)) {
770 new->fsuid = kuid;
d84f4f99
DH		 771 if (security_task_fix_setuid(new, old, LSM_SETID_FS) == 0)
772 goto change_okay;
1da177e4 773 }
1da177e4
LT		 774 }
775
d84f4f99
DH		 776 abort_creds(new);
777 return old_fsuid;
1da177e4 778
d84f4f99
DH		 779change_okay:
780 commit_creds(new);
1da177e4
LT		 781 return old_fsuid;
782}
783
784/*
f42df9e6 785 * Samma på svenska..
1da177e4 786 */
ae1251ab 787SYSCALL_DEFINE1(setfsgid, gid_t, gid)
1da177e4 788{
d84f4f99
DH		 789 const struct cred *old;
790 struct cred *new;
791 gid_t old_fsgid;
a29c33f4
EB		 792 kgid_t kgid;
793
794 old = current_cred();
795 old_fsgid = from_kgid_munged(old->user_ns, old->fsgid);
796
797 kgid = make_kgid(old->user_ns, gid);
798 if (!gid_valid(kgid))
799 return old_fsgid;
d84f4f99
DH		 800
801 new = prepare_creds();
802 if (!new)
a29c33f4 803 return old_fsgid;
1da177e4 804
a29c33f4
EB		 805 if (gid_eq(kgid, old->gid) || gid_eq(kgid, old->egid) ||
806 gid_eq(kgid, old->sgid) || gid_eq(kgid, old->fsgid) ||
c7b96acf 807 ns_capable(old->user_ns, CAP_SETGID)) {
a29c33f4
EB		 808 if (!gid_eq(kgid, old->fsgid)) {
809 new->fsgid = kgid;
d84f4f99 810 goto change_okay;
1da177e4 811 }
1da177e4 812 }
d84f4f99 813
d84f4f99
DH		 814 abort_creds(new);
815 return old_fsgid;
816
817change_okay:
818 commit_creds(new);
1da177e4
LT		 819 return old_fsgid;
820}
2813893f 821#endif /* CONFIG_MULTIUSER */
1da177e4 822
4a22f166
SR		 823/**
824 * sys_getpid - return the thread group id of the current process
825 *
826 * Note, despite the name, this returns the tgid not the pid. The tgid and
827 * the pid are identical unless CLONE_THREAD was specified on clone() in
828 * which case the tgid is the same in all threads of the same group.
829 *
830 * This is SMP safe as current->tgid does not change.
831 */
832SYSCALL_DEFINE0(getpid)
833{
834 return task_tgid_vnr(current);
835}
836
837/* Thread ID - the internal kernel "pid" */
838SYSCALL_DEFINE0(gettid)
839{
840 return task_pid_vnr(current);
841}
842
843/*
844 * Accessing ->real_parent is not SMP-safe, it could
845 * change from under us. However, we can use a stale
846 * value of ->real_parent under rcu_read_lock(), see
847 * release_task()->call_rcu(delayed_put_task_struct).
848 */
849SYSCALL_DEFINE0(getppid)
850{
851 int pid;
852
853 rcu_read_lock();
854 pid = task_tgid_vnr(rcu_dereference(current->real_parent));
855 rcu_read_unlock();
856
857 return pid;
858}
859
860SYSCALL_DEFINE0(getuid)
861{
862 /* Only we change this so SMP safe */
863 return from_kuid_munged(current_user_ns(), current_uid());
864}
865
866SYSCALL_DEFINE0(geteuid)
867{
868 /* Only we change this so SMP safe */
869 return from_kuid_munged(current_user_ns(), current_euid());
870}
871
872SYSCALL_DEFINE0(getgid)
873{
874 /* Only we change this so SMP safe */
875 return from_kgid_munged(current_user_ns(), current_gid());
876}
877
878SYSCALL_DEFINE0(getegid)
879{
880 /* Only we change this so SMP safe */
881 return from_kgid_munged(current_user_ns(), current_egid());
882}
883
f06febc9
FM		 884void do_sys_times(struct tms *tms)
885{
0cf55e1e 886 cputime_t tgutime, tgstime, cutime, cstime;
f06febc9 887
e80d0a1a 888 thread_group_cputime_adjusted(current, &tgutime, &tgstime);
f06febc9
FM		 889 cutime = current->signal->cutime;
890 cstime = current->signal->cstime;
0cf55e1e
HS		 891 tms->tms_utime = cputime_to_clock_t(tgutime);
892 tms->tms_stime = cputime_to_clock_t(tgstime);
f06febc9
FM		 893 tms->tms_cutime = cputime_to_clock_t(cutime);
894 tms->tms_cstime = cputime_to_clock_t(cstime);
895}
896
58fd3aa2 897SYSCALL_DEFINE1(times, struct tms __user *, tbuf)
1da177e4 898{
1da177e4
LT		 899 if (tbuf) {
900 struct tms tmp;
f06febc9
FM		 901
902 do_sys_times(&tmp);
1da177e4
LT		 903 if (copy_to_user(tbuf, &tmp, sizeof(struct tms)))
904 return -EFAULT;
905 }
e3d5a27d 906 force_successful_syscall_return();
1da177e4
LT		 907 return (long) jiffies_64_to_clock_t(get_jiffies_64());
908}
909
910/*
911 * This needs some heavy checking ...
912 * I just haven't the stomach for it. I also don't fully
913 * understand sessions/pgrp etc. Let somebody who does explain it.
914 *
915 * OK, I think I have the protection semantics right.... this is really
916 * only important on a multi-user system anyway, to make sure one user
917 * can't send a signal to a process owned by another. -TYT, 12/12/91
918 *
98611e4e 919 * !PF_FORKNOEXEC check to conform completely to POSIX.
1da177e4 920 */
b290ebe2 921SYSCALL_DEFINE2(setpgid, pid_t, pid, pid_t, pgid)
1da177e4
LT		 922{
923 struct task_struct *p;
ee0acf90 924 struct task_struct *group_leader = current->group_leader;
4e021306
ON		 925 struct pid *pgrp;
926 int err;
1da177e4
LT		 927
928 if (!pid)
b488893a 929 pid = task_pid_vnr(group_leader);
1da177e4
LT		 930 if (!pgid)
931 pgid = pid;
932 if (pgid < 0)
933 return -EINVAL;
950eaaca 934 rcu_read_lock();
1da177e4
LT		 935
936 /* From this point forward we keep holding onto the tasklist lock
937 * so that our parent does not change from under us. -DaveM
938 */
939 write_lock_irq(&tasklist_lock);
940
941 err = -ESRCH;
4e021306 942 p = find_task_by_vpid(pid);
1da177e4
LT		 943 if (!p)
944 goto out;
945
946 err = -EINVAL;
947 if (!thread_group_leader(p))
948 goto out;
949
4e021306 950 if (same_thread_group(p->real_parent, group_leader)) {
1da177e4 951 err = -EPERM;
41487c65 952 if (task_session(p) != task_session(group_leader))
1da177e4
LT		 953 goto out;
954 err = -EACCES;
98611e4e 955 if (!(p->flags & PF_FORKNOEXEC))
1da177e4
LT		 956 goto out;
957 } else {
958 err = -ESRCH;
ee0acf90 959 if (p != group_leader)
1da177e4
LT		 960 goto out;
961 }
962
963 err = -EPERM;
964 if (p->signal->leader)
965 goto out;
966
4e021306 967 pgrp = task_pid(p);
1da177e4 968 if (pgid != pid) {
b488893a 969 struct task_struct *g;
1da177e4 970
4e021306
ON		 971 pgrp = find_vpid(pgid);
972 g = pid_task(pgrp, PIDTYPE_PGID);
41487c65 973 if (!g || task_session(g) != task_session(group_leader))
f020bc46 974 goto out;
1da177e4
LT		 975 }
976
1da177e4
LT		 977 err = security_task_setpgid(p, pgid);
978 if (err)
979 goto out;
980
1b0f7ffd 981 if (task_pgrp(p) != pgrp)
83beaf3c 982 change_pid(p, PIDTYPE_PGID, pgrp);
1da177e4
LT		 983
984 err = 0;
985out:
986 /* All paths lead to here, thus we are safe. -DaveM */
987 write_unlock_irq(&tasklist_lock);
950eaaca 988 rcu_read_unlock();
1da177e4
LT		 989 return err;
990}
991
dbf040d9 992SYSCALL_DEFINE1(getpgid, pid_t, pid)
1da177e4 993{
12a3de0a
ON		 994 struct task_struct *p;
995 struct pid *grp;
996 int retval;
997
998 rcu_read_lock();
756184b7 999 if (!pid)
12a3de0a 1000 grp = task_pgrp(current);
756184b7 1001 else {
1da177e4 1002 retval = -ESRCH;
12a3de0a
ON		 1003 p = find_task_by_vpid(pid);
1004 if (!p)
1005 goto out;
1006 grp = task_pgrp(p);
1007 if (!grp)
1008 goto out;
1009
1010 retval = security_task_getpgid(p);
1011 if (retval)
1012 goto out;
1da177e4 1013 }
12a3de0a
ON		 1014 retval = pid_vnr(grp);
1015out:
1016 rcu_read_unlock();
1017 return retval;
1da177e4
LT		 1018}
1019
1020#ifdef __ARCH_WANT_SYS_GETPGRP
1021
dbf040d9 1022SYSCALL_DEFINE0(getpgrp)
1da177e4 1023{
12a3de0a 1024 return sys_getpgid(0);
1da177e4
LT		 1025}
1026
1027#endif
1028
dbf040d9 1029SYSCALL_DEFINE1(getsid, pid_t, pid)
1da177e4 1030{
1dd768c0
ON		 1031 struct task_struct *p;
1032 struct pid *sid;
1033 int retval;
1034
1035 rcu_read_lock();
756184b7 1036 if (!pid)
1dd768c0 1037 sid = task_session(current);
756184b7 1038 else {
1da177e4 1039 retval = -ESRCH;
1dd768c0
ON		 1040 p = find_task_by_vpid(pid);
1041 if (!p)
1042 goto out;
1043 sid = task_session(p);
1044 if (!sid)
1045 goto out;
1046
1047 retval = security_task_getsid(p);
1048 if (retval)
1049 goto out;
1da177e4 1050 }
1dd768c0
ON		 1051 retval = pid_vnr(sid);
1052out:
1053 rcu_read_unlock();
1054 return retval;
1da177e4
LT		 1055}
1056
81dabb46
ON		 1057static void set_special_pids(struct pid *pid)
1058{
1059 struct task_struct *curr = current->group_leader;
1060
1061 if (task_session(curr) != pid)
1062 change_pid(curr, PIDTYPE_SID, pid);
1063
1064 if (task_pgrp(curr) != pid)
1065 change_pid(curr, PIDTYPE_PGID, pid);
1066}
1067
b290ebe2 1068SYSCALL_DEFINE0(setsid)
1da177e4 1069{
e19f247a 1070 struct task_struct *group_leader = current->group_leader;
e4cc0a9c
ON		 1071 struct pid *sid = task_pid(group_leader);
1072 pid_t session = pid_vnr(sid);
1da177e4
LT		 1073 int err = -EPERM;
1074
1da177e4 1075 write_lock_irq(&tasklist_lock);
390e2ff0
EB		 1076 /* Fail if I am already a session leader */
1077 if (group_leader->signal->leader)
1078 goto out;
1079
430c6231
ON		 1080 /* Fail if a process group id already exists that equals the
1081 * proposed session id.
390e2ff0 1082 */
6806aac6 1083 if (pid_task(sid, PIDTYPE_PGID))
1da177e4
LT		 1084 goto out;
1085
e19f247a 1086 group_leader->signal->leader = 1;
81dabb46 1087 set_special_pids(sid);
24ec839c 1088
9c9f4ded 1089 proc_clear_tty(group_leader);
24ec839c 1090
e4cc0a9c 1091 err = session;
1da177e4
LT		 1092out:
1093 write_unlock_irq(&tasklist_lock);
5091faa4 1094 if (err > 0) {
0d0df599 1095 proc_sid_connector(group_leader);
5091faa4
MG		 1096 sched_autogroup_create_attach(group_leader);
1097 }
1da177e4
LT		 1098 return err;
1099}
1100
1da177e4
LT		 1101DECLARE_RWSEM(uts_sem);
1102
e28cbf22
CH		 1103#ifdef COMPAT_UTS_MACHINE
1104#define override_architecture(name) \
46da2766 1105 (personality(current->personality) == PER_LINUX32 && \
e28cbf22
CH		 1106 copy_to_user(name->machine, COMPAT_UTS_MACHINE, \
1107 sizeof(COMPAT_UTS_MACHINE)))
1108#else
1109#define override_architecture(name) 0
1110#endif
1111
be27425d
AK		 1112/*
1113 * Work around broken programs that cannot handle "Linux 3.0".
1114 * Instead we map 3.x to 2.6.40+x, so e.g. 3.0 would be 2.6.40
39afb5ee 1115 * And we map 4.x to 2.6.60+x, so 4.0 would be 2.6.60.
be27425d 1116 */
2702b152 1117static int override_release(char __user *release, size_t len)
be27425d
AK		 1118{
1119 int ret = 0;
be27425d
AK		 1120
1121 if (current->personality & UNAME26) {
2702b152
KC		 1122 const char *rest = UTS_RELEASE;
1123 char buf[65] = { 0 };
be27425d
AK		 1124 int ndots = 0;
1125 unsigned v;
2702b152 1126 size_t copy;
be27425d
AK		 1127
1128 while (*rest) {
1129 if (*rest == '.' && ++ndots >= 3)
1130 break;
1131 if (!isdigit(*rest) && *rest != '.')
1132 break;
1133 rest++;
1134 }
39afb5ee 1135 v = ((LINUX_VERSION_CODE >> 8) & 0xff) + 60;
31fd84b9 1136 copy = clamp_t(size_t, len, 1, sizeof(buf));
2702b152
KC		 1137 copy = scnprintf(buf, copy, "2.6.%u%s", v, rest);
1138 ret = copy_to_user(release, buf, copy + 1);
be27425d
AK		 1139 }
1140 return ret;
1141}
1142
e48fbb69 1143SYSCALL_DEFINE1(newuname, struct new_utsname __user *, name)
1da177e4
LT		 1144{
1145 int errno = 0;
1146
1147 down_read(&uts_sem);
e9ff3990 1148 if (copy_to_user(name, utsname(), sizeof *name))
1da177e4
LT		 1149 errno = -EFAULT;
1150 up_read(&uts_sem);
e28cbf22 1151
be27425d
AK		 1152 if (!errno && override_release(name->release, sizeof(name->release)))
1153 errno = -EFAULT;
e28cbf22
CH		 1154 if (!errno && override_architecture(name))
1155 errno = -EFAULT;
1da177e4
LT		 1156 return errno;
1157}
1158
5cacdb4a
CH		 1159#ifdef __ARCH_WANT_SYS_OLD_UNAME
1160/*
1161 * Old cruft
1162 */
1163SYSCALL_DEFINE1(uname, struct old_utsname __user *, name)
1164{
1165 int error = 0;
1166
1167 if (!name)
1168 return -EFAULT;
1169
1170 down_read(&uts_sem);
1171 if (copy_to_user(name, utsname(), sizeof(*name)))
1172 error = -EFAULT;
1173 up_read(&uts_sem);
1174
be27425d
AK		 1175 if (!error && override_release(name->release, sizeof(name->release)))
1176 error = -EFAULT;
5cacdb4a
CH		 1177 if (!error && override_architecture(name))
1178 error = -EFAULT;
1179 return error;
1180}
1181
1182SYSCALL_DEFINE1(olduname, struct oldold_utsname __user *, name)
1183{
1184 int error;
1185
1186 if (!name)
1187 return -EFAULT;
1188 if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname)))
1189 return -EFAULT;
1190
1191 down_read(&uts_sem);
1192 error = __copy_to_user(&name->sysname, &utsname()->sysname,
1193 __OLD_UTS_LEN);
1194 error |= __put_user(0, name->sysname + __OLD_UTS_LEN);
1195 error |= __copy_to_user(&name->nodename, &utsname()->nodename,
1196 __OLD_UTS_LEN);
1197 error |= __put_user(0, name->nodename + __OLD_UTS_LEN);
1198 error |= __copy_to_user(&name->release, &utsname()->release,
1199 __OLD_UTS_LEN);
1200 error |= __put_user(0, name->release + __OLD_UTS_LEN);
1201 error |= __copy_to_user(&name->version, &utsname()->version,
1202 __OLD_UTS_LEN);
1203 error |= __put_user(0, name->version + __OLD_UTS_LEN);
1204 error |= __copy_to_user(&name->machine, &utsname()->machine,
1205 __OLD_UTS_LEN);
1206 error |= __put_user(0, name->machine + __OLD_UTS_LEN);
1207 up_read(&uts_sem);
1208
1209 if (!error && override_architecture(name))
1210 error = -EFAULT;
be27425d
AK		 1211 if (!error && override_release(name->release, sizeof(name->release)))
1212 error = -EFAULT;
5cacdb4a
CH		 1213 return error ? -EFAULT : 0;
1214}
1215#endif
1216
5a8a82b1 1217SYSCALL_DEFINE2(sethostname, char __user *, name, int, len)
1da177e4
LT		 1218{
1219 int errno;
1220 char tmp[__NEW_UTS_LEN];
1221
bb96a6f5 1222 if (!ns_capable(current->nsproxy->uts_ns->user_ns, CAP_SYS_ADMIN))
1da177e4 1223 return -EPERM;
fc832ad3 1224
1da177e4
LT		 1225 if (len < 0 || len > __NEW_UTS_LEN)
1226 return -EINVAL;
1227 down_write(&uts_sem);
1228 errno = -EFAULT;
1229 if (!copy_from_user(tmp, name, len)) {
9679e4dd
AM		 1230 struct new_utsname *u = utsname();
1231
1232 memcpy(u->nodename, tmp, len);
1233 memset(u->nodename + len, 0, sizeof(u->nodename) - len);
1da177e4 1234 errno = 0;
499eea6b 1235 uts_proc_notify(UTS_PROC_HOSTNAME);
1da177e4
LT		 1236 }
1237 up_write(&uts_sem);
1238 return errno;
1239}
1240
1241#ifdef __ARCH_WANT_SYS_GETHOSTNAME
1242
5a8a82b1 1243SYSCALL_DEFINE2(gethostname, char __user *, name, int, len)
1da177e4
LT		 1244{
1245 int i, errno;
9679e4dd 1246 struct new_utsname *u;
1da177e4
LT		 1247
1248 if (len < 0)
1249 return -EINVAL;
1250 down_read(&uts_sem);
9679e4dd
AM		 1251 u = utsname();
1252 i = 1 + strlen(u->nodename);
1da177e4
LT		 1253 if (i > len)
1254 i = len;
1255 errno = 0;
9679e4dd 1256 if (copy_to_user(name, u->nodename, i))
1da177e4
LT		 1257 errno = -EFAULT;
1258 up_read(&uts_sem);
1259 return errno;
1260}
1261
1262#endif
1263
1264/*
1265 * Only setdomainname; getdomainname can be implemented by calling
1266 * uname()
1267 */
5a8a82b1 1268SYSCALL_DEFINE2(setdomainname, char __user *, name, int, len)
1da177e4
LT		 1269{
1270 int errno;
1271 char tmp[__NEW_UTS_LEN];
1272
fc832ad3 1273 if (!ns_capable(current->nsproxy->uts_ns->user_ns, CAP_SYS_ADMIN))
1da177e4
LT		 1274 return -EPERM;
1275 if (len < 0 || len > __NEW_UTS_LEN)
1276 return -EINVAL;
1277
1278 down_write(&uts_sem);
1279 errno = -EFAULT;
1280 if (!copy_from_user(tmp, name, len)) {
9679e4dd
AM		 1281 struct new_utsname *u = utsname();
1282
1283 memcpy(u->domainname, tmp, len);
1284 memset(u->domainname + len, 0, sizeof(u->domainname) - len);
1da177e4 1285 errno = 0;
499eea6b 1286 uts_proc_notify(UTS_PROC_DOMAINNAME);
1da177e4
LT		 1287 }
1288 up_write(&uts_sem);
1289 return errno;
1290}
1291
e48fbb69 1292SYSCALL_DEFINE2(getrlimit, unsigned int, resource, struct rlimit __user *, rlim)
1da177e4 1293{
b9518345
JS		 1294 struct rlimit value;
1295 int ret;
1296
1297 ret = do_prlimit(current, resource, NULL, &value);
1298 if (!ret)
1299 ret = copy_to_user(rlim, &value, sizeof(*rlim)) ? -EFAULT : 0;
1300
1301 return ret;
1da177e4
LT		 1302}
1303
1304#ifdef __ARCH_WANT_SYS_OLD_GETRLIMIT
1305
1306/*
1307 * Back compatibility for getrlimit. Needed for some apps.
1308 */
e48fbb69
HC		 1309SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource,
1310 struct rlimit __user *, rlim)
1da177e4
LT		 1311{
1312 struct rlimit x;
1313 if (resource >= RLIM_NLIMITS)
1314 return -EINVAL;
1315
1316 task_lock(current->group_leader);
1317 x = current->signal->rlim[resource];
1318 task_unlock(current->group_leader);
756184b7 1319 if (x.rlim_cur > 0x7FFFFFFF)
1da177e4 1320 x.rlim_cur = 0x7FFFFFFF;
756184b7 1321 if (x.rlim_max > 0x7FFFFFFF)
1da177e4 1322 x.rlim_max = 0x7FFFFFFF;
ec94fc3d 1323 return copy_to_user(rlim, &x, sizeof(x)) ? -EFAULT : 0;
1da177e4
LT		 1324}
1325
1326#endif
1327
c022a0ac
JS		 1328static inline bool rlim64_is_infinity(__u64 rlim64)
1329{
1330#if BITS_PER_LONG < 64
1331 return rlim64 >= ULONG_MAX;
1332#else
1333 return rlim64 == RLIM64_INFINITY;
1334#endif
1335}
1336
1337static void rlim_to_rlim64(const struct rlimit *rlim, struct rlimit64 *rlim64)
1338{
1339 if (rlim->rlim_cur == RLIM_INFINITY)
1340 rlim64->rlim_cur = RLIM64_INFINITY;
1341 else
1342 rlim64->rlim_cur = rlim->rlim_cur;
1343 if (rlim->rlim_max == RLIM_INFINITY)
1344 rlim64->rlim_max = RLIM64_INFINITY;
1345 else
1346 rlim64->rlim_max = rlim->rlim_max;
1347}
1348
1349static void rlim64_to_rlim(const struct rlimit64 *rlim64, struct rlimit *rlim)
1350{
1351 if (rlim64_is_infinity(rlim64->rlim_cur))
1352 rlim->rlim_cur = RLIM_INFINITY;
1353 else
1354 rlim->rlim_cur = (unsigned long)rlim64->rlim_cur;
1355 if (rlim64_is_infinity(rlim64->rlim_max))
1356 rlim->rlim_max = RLIM_INFINITY;
1357 else
1358 rlim->rlim_max = (unsigned long)rlim64->rlim_max;
1359}
1360
1c1e618d 1361/* make sure you are allowed to change @tsk limits before calling this */
5b41535a
JS		 1362int do_prlimit(struct task_struct *tsk, unsigned int resource,
1363 struct rlimit *new_rlim, struct rlimit *old_rlim)
1da177e4 1364{
5b41535a 1365 struct rlimit *rlim;
86f162f4 1366 int retval = 0;
1da177e4
LT		 1367
1368 if (resource >= RLIM_NLIMITS)
1369 return -EINVAL;
5b41535a
JS		 1370 if (new_rlim) {
1371 if (new_rlim->rlim_cur > new_rlim->rlim_max)
1372 return -EINVAL;
1373 if (resource == RLIMIT_NOFILE &&
1374 new_rlim->rlim_max > sysctl_nr_open)
1375 return -EPERM;
1376 }
1da177e4 1377
1c1e618d
JS		 1378 /* protect tsk->signal and tsk->sighand from disappearing */
1379 read_lock(&tasklist_lock);
1380 if (!tsk->sighand) {
1381 retval = -ESRCH;
1382 goto out;
1383 }
1384
5b41535a 1385 rlim = tsk->signal->rlim + resource;
86f162f4 1386 task_lock(tsk->group_leader);
5b41535a 1387 if (new_rlim) {
fc832ad3
SH		 1388 /* Keep the capable check against init_user_ns until
1389 cgroups can contain all limits */
5b41535a
JS		 1390 if (new_rlim->rlim_max > rlim->rlim_max &&
1391 !capable(CAP_SYS_RESOURCE))
1392 retval = -EPERM;
1393 if (!retval)
1394 retval = security_task_setrlimit(tsk->group_leader,
1395 resource, new_rlim);
1396 if (resource == RLIMIT_CPU && new_rlim->rlim_cur == 0) {
1397 /*
1398 * The caller is asking for an immediate RLIMIT_CPU
1399 * expiry. But we use the zero value to mean "it was
1400 * never set". So let's cheat and make it one second
1401 * instead
1402 */
1403 new_rlim->rlim_cur = 1;
1404 }
1405 }
1406 if (!retval) {
1407 if (old_rlim)
1408 *old_rlim = *rlim;
1409 if (new_rlim)
1410 *rlim = *new_rlim;
9926e4c7 1411 }
7855c35d 1412 task_unlock(tsk->group_leader);
1da177e4 1413
d3561f78
AM		 1414 /*
1415 * RLIMIT_CPU handling. Note that the kernel fails to return an error
1416 * code if it rejected the user's attempt to set RLIMIT_CPU. This is a
1417 * very long-standing error, and fixing it now risks breakage of
1418 * applications, so we live with it
1419 */
5b41535a
JS		 1420 if (!retval && new_rlim && resource == RLIMIT_CPU &&
1421 new_rlim->rlim_cur != RLIM_INFINITY)
1422 update_rlimit_cpu(tsk, new_rlim->rlim_cur);
ec9e16ba 1423out:
1c1e618d 1424 read_unlock(&tasklist_lock);
2fb9d268 1425 return retval;
1da177e4
LT		 1426}
1427
c022a0ac
JS		 1428/* rcu lock must be held */
1429static int check_prlimit_permission(struct task_struct *task)
1430{
1431 const struct cred *cred = current_cred(), *tcred;
1432
fc832ad3
SH		 1433 if (current == task)
1434 return 0;
c022a0ac 1435
fc832ad3 1436 tcred = __task_cred(task);
5af66203
EB		 1437 if (uid_eq(cred->uid, tcred->euid) &&
1438 uid_eq(cred->uid, tcred->suid) &&
1439 uid_eq(cred->uid, tcred->uid) &&
1440 gid_eq(cred->gid, tcred->egid) &&
1441 gid_eq(cred->gid, tcred->sgid) &&
1442 gid_eq(cred->gid, tcred->gid))
fc832ad3 1443 return 0;
c4a4d603 1444 if (ns_capable(tcred->user_ns, CAP_SYS_RESOURCE))
fc832ad3
SH		 1445 return 0;
1446
1447 return -EPERM;
c022a0ac
JS		 1448}
1449
1450SYSCALL_DEFINE4(prlimit64, pid_t, pid, unsigned int, resource,
1451 const struct rlimit64 __user *, new_rlim,
1452 struct rlimit64 __user *, old_rlim)
1453{
1454 struct rlimit64 old64, new64;
1455 struct rlimit old, new;
1456 struct task_struct *tsk;
1457 int ret;
1458
1459 if (new_rlim) {
1460 if (copy_from_user(&new64, new_rlim, sizeof(new64)))
1461 return -EFAULT;
1462 rlim64_to_rlim(&new64, &new);
1463 }
1464
1465 rcu_read_lock();
1466 tsk = pid ? find_task_by_vpid(pid) : current;
1467 if (!tsk) {
1468 rcu_read_unlock();
1469 return -ESRCH;
1470 }
1471 ret = check_prlimit_permission(tsk);
1472 if (ret) {
1473 rcu_read_unlock();
1474 return ret;
1475 }
1476 get_task_struct(tsk);
1477 rcu_read_unlock();
1478
1479 ret = do_prlimit(tsk, resource, new_rlim ? &new : NULL,
1480 old_rlim ? &old : NULL);
1481
1482 if (!ret && old_rlim) {
1483 rlim_to_rlim64(&old, &old64);
1484 if (copy_to_user(old_rlim, &old64, sizeof(old64)))
1485 ret = -EFAULT;
1486 }
1487
1488 put_task_struct(tsk);
1489 return ret;
1490}
1491
7855c35d
JS		 1492SYSCALL_DEFINE2(setrlimit, unsigned int, resource, struct rlimit __user *, rlim)
1493{
1494 struct rlimit new_rlim;
1495
1496 if (copy_from_user(&new_rlim, rlim, sizeof(*rlim)))
1497 return -EFAULT;
5b41535a 1498 return do_prlimit(current, resource, &new_rlim, NULL);
7855c35d
JS		 1499}
1500
1da177e4
LT		 1501/*
1502 * It would make sense to put struct rusage in the task_struct,
1503 * except that would make the task_struct be *really big*. After
1504 * task_struct gets moved into malloc'ed memory, it would
1505 * make sense to do this. It will make moving the rest of the information
1506 * a lot simpler! (Which we're not doing right now because we're not
1507 * measuring them yet).
1508 *
1da177e4
LT		 1509 * When sampling multiple threads for RUSAGE_SELF, under SMP we might have
1510 * races with threads incrementing their own counters. But since word
1511 * reads are atomic, we either get new values or old values and we don't
1512 * care which for the sums. We always take the siglock to protect reading
1513 * the c* fields from p->signal from races with exit.c updating those
1514 * fields when reaping, so a sample either gets all the additions of a
1515 * given child after it's reaped, or none so this sample is before reaping.
2dd0ebcd 1516 *
de047c1b
RT		 1517 * Locking:
1518 * We need to take the siglock for CHILDEREN, SELF and BOTH
1519 * for the cases current multithreaded, non-current single threaded
1520 * non-current multithreaded. Thread traversal is now safe with
1521 * the siglock held.
1522 * Strictly speaking, we donot need to take the siglock if we are current and
1523 * single threaded, as no one else can take our signal_struct away, no one
1524 * else can reap the children to update signal->c* counters, and no one else
1525 * can race with the signal-> fields. If we do not take any lock, the
1526 * signal-> fields could be read out of order while another thread was just
1527 * exiting. So we should place a read memory barrier when we avoid the lock.
1528 * On the writer side, write memory barrier is implied in __exit_signal
1529 * as __exit_signal releases the siglock spinlock after updating the signal->
1530 * fields. But we don't do this yet to keep things simple.
2dd0ebcd 1531 *
1da177e4
LT		 1532 */
1533
f06febc9 1534static void accumulate_thread_rusage(struct task_struct *t, struct rusage *r)
679c9cd4 1535{
679c9cd4
SK		 1536 r->ru_nvcsw += t->nvcsw;
1537 r->ru_nivcsw += t->nivcsw;
1538 r->ru_minflt += t->min_flt;
1539 r->ru_majflt += t->maj_flt;
1540 r->ru_inblock += task_io_get_inblock(t);
1541 r->ru_oublock += task_io_get_oublock(t);
1542}
1543
1da177e4
LT		 1544static void k_getrusage(struct task_struct *p, int who, struct rusage *r)
1545{
1546 struct task_struct *t;
1547 unsigned long flags;
0cf55e1e 1548 cputime_t tgutime, tgstime, utime, stime;
1f10206c 1549 unsigned long maxrss = 0;
1da177e4 1550
ec94fc3d 1551 memset((char *)r, 0, sizeof (*r));
64861634 1552 utime = stime = 0;
1da177e4 1553
679c9cd4 1554 if (who == RUSAGE_THREAD) {
e80d0a1a 1555 task_cputime_adjusted(current, &utime, &stime);
f06febc9 1556 accumulate_thread_rusage(p, r);
1f10206c 1557 maxrss = p->signal->maxrss;
679c9cd4
SK		 1558 goto out;
1559 }
1560
d6cf723a 1561 if (!lock_task_sighand(p, &flags))
de047c1b 1562 return;
0f59cc4a 1563
1da177e4 1564 switch (who) {
ec94fc3d 1565 case RUSAGE_BOTH:
1566 case RUSAGE_CHILDREN:
1567 utime = p->signal->cutime;
1568 stime = p->signal->cstime;
1569 r->ru_nvcsw = p->signal->cnvcsw;
1570 r->ru_nivcsw = p->signal->cnivcsw;
1571 r->ru_minflt = p->signal->cmin_flt;
1572 r->ru_majflt = p->signal->cmaj_flt;
1573 r->ru_inblock = p->signal->cinblock;
1574 r->ru_oublock = p->signal->coublock;
1575 maxrss = p->signal->cmaxrss;
1576
1577 if (who == RUSAGE_CHILDREN)
1da177e4 1578 break;
0f59cc4a 1579
ec94fc3d 1580 case RUSAGE_SELF:
1581 thread_group_cputime_adjusted(p, &tgutime, &tgstime);
1582 utime += tgutime;
1583 stime += tgstime;
1584 r->ru_nvcsw += p->signal->nvcsw;
1585 r->ru_nivcsw += p->signal->nivcsw;
1586 r->ru_minflt += p->signal->min_flt;
1587 r->ru_majflt += p->signal->maj_flt;
1588 r->ru_inblock += p->signal->inblock;
1589 r->ru_oublock += p->signal->oublock;
1590 if (maxrss < p->signal->maxrss)
1591 maxrss = p->signal->maxrss;
1592 t = p;
1593 do {
1594 accumulate_thread_rusage(t, r);
1595 } while_each_thread(p, t);
1596 break;
1597
1598 default:
1599 BUG();
1da177e4 1600 }
de047c1b 1601 unlock_task_sighand(p, &flags);
de047c1b 1602
679c9cd4 1603out:
0f59cc4a
ON		 1604 cputime_to_timeval(utime, &r->ru_utime);
1605 cputime_to_timeval(stime, &r->ru_stime);
1f10206c
JP		 1606
1607 if (who != RUSAGE_CHILDREN) {
1608 struct mm_struct *mm = get_task_mm(p);
ec94fc3d 1609
1f10206c
JP		 1610 if (mm) {
1611 setmax_mm_hiwater_rss(&maxrss, mm);
1612 mmput(mm);
1613 }
1614 }
1615 r->ru_maxrss = maxrss * (PAGE_SIZE / 1024); /* convert pages to KBs */
1da177e4
LT		 1616}
1617
1618int getrusage(struct task_struct *p, int who, struct rusage __user *ru)
1619{
1620 struct rusage r;
ec94fc3d 1621
1da177e4 1622 k_getrusage(p, who, &r);
1da177e4
LT		 1623 return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0;
1624}
1625
e48fbb69 1626SYSCALL_DEFINE2(getrusage, int, who, struct rusage __user *, ru)
1da177e4 1627{
679c9cd4
SK		 1628 if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN &&
1629 who != RUSAGE_THREAD)
1da177e4
LT		 1630 return -EINVAL;
1631 return getrusage(current, who, ru);
1632}
1633
8d2d5c4a
AV		 1634#ifdef CONFIG_COMPAT
1635COMPAT_SYSCALL_DEFINE2(getrusage, int, who, struct compat_rusage __user *, ru)
1636{
1637 struct rusage r;
1638
1639 if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN &&
1640 who != RUSAGE_THREAD)
1641 return -EINVAL;
1642
1643 k_getrusage(current, who, &r);
1644 return put_compat_rusage(&r, ru);
1645}
1646#endif
1647
e48fbb69 1648SYSCALL_DEFINE1(umask, int, mask)
1da177e4
LT		 1649{
1650 mask = xchg(&current->fs->umask, mask & S_IRWXUGO);
1651 return mask;
1652}
3b7391de 1653
6e399cd1 1654static int prctl_set_mm_exe_file(struct mm_struct *mm, unsigned int fd)
b32dfe37 1655{
2903ff01 1656 struct fd exe;
6e399cd1 1657 struct file *old_exe, *exe_file;
496ad9aa 1658 struct inode *inode;
2903ff01 1659 int err;
b32dfe37 1660
2903ff01
AV		 1661 exe = fdget(fd);
1662 if (!exe.file)
b32dfe37
CG		 1663 return -EBADF;
1664
496ad9aa 1665 inode = file_inode(exe.file);
b32dfe37
CG		 1666
1667 /*
1668 * Because the original mm->exe_file points to executable file, make
1669 * sure that this one is executable as well, to avoid breaking an
1670 * overall picture.
1671 */
1672 err = -EACCES;
90f8572b 1673 if (!S_ISREG(inode->i_mode) || path_noexec(&exe.file->f_path))
b32dfe37
CG		 1674 goto exit;
1675
496ad9aa 1676 err = inode_permission(inode, MAY_EXEC);
b32dfe37
CG		 1677 if (err)
1678 goto exit;
1679
bafb282d 1680 /*
4229fb1d 1681 * Forbid mm->exe_file change if old file still mapped.
bafb282d 1682 */
6e399cd1 1683 exe_file = get_mm_exe_file(mm);
bafb282d 1684 err = -EBUSY;
6e399cd1 1685 if (exe_file) {
4229fb1d
KK		 1686 struct vm_area_struct *vma;
1687
6e399cd1
DB		 1688 down_read(&mm->mmap_sem);
1689 for (vma = mm->mmap; vma; vma = vma->vm_next) {
1690 if (!vma->vm_file)
1691 continue;
1692 if (path_equal(&vma->vm_file->f_path,
1693 &exe_file->f_path))
1694 goto exit_err;
1695 }
1696
1697 up_read(&mm->mmap_sem);
1698 fput(exe_file);
bafb282d
KK		 1699 }
1700
b32dfe37
CG		 1701 /*
1702 * The symlink can be changed only once, just to disallow arbitrary
1703 * transitions malicious software might bring in. This means one
1704 * could make a snapshot over all processes running and monitor
1705 * /proc/pid/exe changes to notice unusual activity if needed.
1706 */
bafb282d
KK		 1707 err = -EPERM;
1708 if (test_and_set_bit(MMF_EXE_FILE_CHANGED, &mm->flags))
71fe97e1 1709 goto exit;
bafb282d 1710
4229fb1d 1711 err = 0;
6e399cd1
DB		 1712 /* set the new file, lockless */
1713 get_file(exe.file);
1714 old_exe = xchg(&mm->exe_file, exe.file);
1715 if (old_exe)
1716 fput(old_exe);
b32dfe37 1717exit:
2903ff01 1718 fdput(exe);
b32dfe37 1719 return err;
6e399cd1
DB		 1720exit_err:
1721 up_read(&mm->mmap_sem);
1722 fput(exe_file);
1723 goto exit;
b32dfe37
CG		 1724}
1725
f606b77f
CG		 1726/*
1727 * WARNING: we don't require any capability here so be very careful
1728 * in what is allowed for modification from userspace.
1729 */
1730static int validate_prctl_map(struct prctl_mm_map *prctl_map)
1731{
1732 unsigned long mmap_max_addr = TASK_SIZE;
1733 struct mm_struct *mm = current->mm;
1734 int error = -EINVAL, i;
1735
1736 static const unsigned char offsets[] = {
1737 offsetof(struct prctl_mm_map, start_code),
1738 offsetof(struct prctl_mm_map, end_code),
1739 offsetof(struct prctl_mm_map, start_data),
1740 offsetof(struct prctl_mm_map, end_data),
1741 offsetof(struct prctl_mm_map, start_brk),
1742 offsetof(struct prctl_mm_map, brk),
1743 offsetof(struct prctl_mm_map, start_stack),
1744 offsetof(struct prctl_mm_map, arg_start),
1745 offsetof(struct prctl_mm_map, arg_end),
1746 offsetof(struct prctl_mm_map, env_start),
1747 offsetof(struct prctl_mm_map, env_end),
1748 };
1749
1750 /*
1751 * Make sure the members are not somewhere outside
1752 * of allowed address space.
1753 */
1754 for (i = 0; i < ARRAY_SIZE(offsets); i++) {
1755 u64 val = *(u64 *)((char *)prctl_map + offsets[i]);
1756
1757 if ((unsigned long)val >= mmap_max_addr ||
1758 (unsigned long)val < mmap_min_addr)
1759 goto out;
1760 }
1761
1762 /*
1763 * Make sure the pairs are ordered.
1764 */
1765#define __prctl_check_order(__m1, __op, __m2) \
1766 ((unsigned long)prctl_map->__m1 __op \
1767 (unsigned long)prctl_map->__m2) ? 0 : -EINVAL
1768 error = __prctl_check_order(start_code, <, end_code);
1769 error |= __prctl_check_order(start_data, <, end_data);
1770 error |= __prctl_check_order(start_brk, <=, brk);
1771 error |= __prctl_check_order(arg_start, <=, arg_end);
1772 error |= __prctl_check_order(env_start, <=, env_end);
1773 if (error)
1774 goto out;
1775#undef __prctl_check_order
1776
1777 error = -EINVAL;
1778
1779 /*
1780 * @brk should be after @end_data in traditional maps.
1781 */
1782 if (prctl_map->start_brk <= prctl_map->end_data ||
1783 prctl_map->brk <= prctl_map->end_data)
1784 goto out;
1785
1786 /*
1787 * Neither we should allow to override limits if they set.
1788 */
1789 if (check_data_rlimit(rlimit(RLIMIT_DATA), prctl_map->brk,
1790 prctl_map->start_brk, prctl_map->end_data,
1791 prctl_map->start_data))
1792 goto out;
1793
1794 /*
1795 * Someone is trying to cheat the auxv vector.
1796 */
1797 if (prctl_map->auxv_size) {
1798 if (!prctl_map->auxv || prctl_map->auxv_size > sizeof(mm->saved_auxv))
1799 goto out;
1800 }
1801
1802 /*
1803 * Finally, make sure the caller has the rights to
1804 * change /proc/pid/exe link: only local root should
1805 * be allowed to.
1806 */
1807 if (prctl_map->exe_fd != (u32)-1) {
1808 struct user_namespace *ns = current_user_ns();
1809 const struct cred *cred = current_cred();
1810
1811 if (!uid_eq(cred->uid, make_kuid(ns, 0)) ||
1812 !gid_eq(cred->gid, make_kgid(ns, 0)))
1813 goto out;
1814 }
1815
1816 error = 0;
1817out:
1818 return error;
1819}
1820
4a00e9df 1821#ifdef CONFIG_CHECKPOINT_RESTORE
f606b77f
CG		 1822static int prctl_set_mm_map(int opt, const void __user *addr, unsigned long data_size)
1823{
1824 struct prctl_mm_map prctl_map = { .exe_fd = (u32)-1, };
1825 unsigned long user_auxv[AT_VECTOR_SIZE];
1826 struct mm_struct *mm = current->mm;
1827 int error;
1828
1829 BUILD_BUG_ON(sizeof(user_auxv) != sizeof(mm->saved_auxv));
1830 BUILD_BUG_ON(sizeof(struct prctl_mm_map) > 256);
1831
1832 if (opt == PR_SET_MM_MAP_SIZE)
1833 return put_user((unsigned int)sizeof(prctl_map),
1834 (unsigned int __user *)addr);
1835
1836 if (data_size != sizeof(prctl_map))
1837 return -EINVAL;
1838
1839 if (copy_from_user(&prctl_map, addr, sizeof(prctl_map)))
1840 return -EFAULT;
1841
1842 error = validate_prctl_map(&prctl_map);
1843 if (error)
1844 return error;
1845
1846 if (prctl_map.auxv_size) {
1847 memset(user_auxv, 0, sizeof(user_auxv));
1848 if (copy_from_user(user_auxv,
1849 (const void __user *)prctl_map.auxv,
1850 prctl_map.auxv_size))
1851 return -EFAULT;
1852
1853 /* Last entry must be AT_NULL as specification requires */
1854 user_auxv[AT_VECTOR_SIZE - 2] = AT_NULL;
1855 user_auxv[AT_VECTOR_SIZE - 1] = AT_NULL;
1856 }
1857
e5e99792 1858 if (prctl_map.exe_fd != (u32)-1) {
6e399cd1 1859 error = prctl_set_mm_exe_file(mm, prctl_map.exe_fd);
e5e99792
MG		 1860 if (error)
1861 return error;
1862 }
1863
1864 down_write(&mm->mmap_sem);
f606b77f
CG		 1865
1866 /*
1867 * We don't validate if these members are pointing to
1868 * real present VMAs because application may have correspond
1869 * VMAs already unmapped and kernel uses these members for statistics
1870 * output in procfs mostly, except
1871 *
1872 * - @start_brk/@brk which are used in do_brk but kernel lookups
1873 * for VMAs when updating these memvers so anything wrong written
1874 * here cause kernel to swear at userspace program but won't lead
1875 * to any problem in kernel itself
1876 */
1877
1878 mm->start_code = prctl_map.start_code;
1879 mm->end_code = prctl_map.end_code;
1880 mm->start_data = prctl_map.start_data;
1881 mm->end_data = prctl_map.end_data;
1882 mm->start_brk = prctl_map.start_brk;
1883 mm->brk = prctl_map.brk;
1884 mm->start_stack = prctl_map.start_stack;
1885 mm->arg_start = prctl_map.arg_start;
1886 mm->arg_end = prctl_map.arg_end;
1887 mm->env_start = prctl_map.env_start;
1888 mm->env_end = prctl_map.env_end;
1889
1890 /*
1891 * Note this update of @saved_auxv is lockless thus
1892 * if someone reads this member in procfs while we're
1893 * updating -- it may get partly updated results. It's
1894 * known and acceptable trade off: we leave it as is to
1895 * not introduce additional locks here making the kernel
1896 * more complex.
1897 */
1898 if (prctl_map.auxv_size)
1899 memcpy(mm->saved_auxv, user_auxv, sizeof(user_auxv));
1900
e5e99792
MG		 1901 up_write(&mm->mmap_sem);
1902 return 0;
f606b77f
CG		 1903}
1904#endif /* CONFIG_CHECKPOINT_RESTORE */
1905
4a00e9df
AD		 1906static int prctl_set_auxv(struct mm_struct *mm, unsigned long addr,
1907 unsigned long len)
1908{
1909 /*
1910 * This doesn't move the auxiliary vector itself since it's pinned to
1911 * mm_struct, but it permits filling the vector with new values. It's
1912 * up to the caller to provide sane values here, otherwise userspace
1913 * tools which use this vector might be unhappy.
1914 */
1915 unsigned long user_auxv[AT_VECTOR_SIZE];
1916
1917 if (len > sizeof(user_auxv))
1918 return -EINVAL;
1919
1920 if (copy_from_user(user_auxv, (const void __user *)addr, len))
1921 return -EFAULT;
1922
1923 /* Make sure the last entry is always AT_NULL */
1924 user_auxv[AT_VECTOR_SIZE - 2] = 0;
1925 user_auxv[AT_VECTOR_SIZE - 1] = 0;
1926
1927 BUILD_BUG_ON(sizeof(user_auxv) != sizeof(mm->saved_auxv));
1928
1929 task_lock(current);
1930 memcpy(mm->saved_auxv, user_auxv, len);
1931 task_unlock(current);
1932
1933 return 0;
1934}
1935
028ee4be
CG		 1936static int prctl_set_mm(int opt, unsigned long addr,
1937 unsigned long arg4, unsigned long arg5)
1938{
028ee4be 1939 struct mm_struct *mm = current->mm;
4a00e9df 1940 struct prctl_mm_map prctl_map;
fe8c7f5c
CG		 1941 struct vm_area_struct *vma;
1942 int error;
028ee4be 1943
f606b77f
CG		 1944 if (arg5 || (arg4 && (opt != PR_SET_MM_AUXV &&
1945 opt != PR_SET_MM_MAP &&
1946 opt != PR_SET_MM_MAP_SIZE)))
028ee4be
CG		 1947 return -EINVAL;
1948
f606b77f
CG		 1949#ifdef CONFIG_CHECKPOINT_RESTORE
1950 if (opt == PR_SET_MM_MAP || opt == PR_SET_MM_MAP_SIZE)
1951 return prctl_set_mm_map(opt, (const void __user *)addr, arg4);
1952#endif
1953
79f0713d 1954 if (!capable(CAP_SYS_RESOURCE))
028ee4be
CG		 1955 return -EPERM;
1956
6e399cd1
DB		 1957 if (opt == PR_SET_MM_EXE_FILE)
1958 return prctl_set_mm_exe_file(mm, (unsigned int)addr);
b32dfe37 1959
4a00e9df
AD		 1960 if (opt == PR_SET_MM_AUXV)
1961 return prctl_set_auxv(mm, addr, arg4);
1962
1ad75b9e 1963 if (addr >= TASK_SIZE || addr < mmap_min_addr)
028ee4be
CG		 1964 return -EINVAL;
1965
fe8c7f5c
CG		 1966 error = -EINVAL;
1967
e5e99792 1968 down_write(&mm->mmap_sem);
028ee4be
CG		 1969 vma = find_vma(mm, addr);
1970
4a00e9df
AD		 1971 prctl_map.start_code = mm->start_code;
1972 prctl_map.end_code = mm->end_code;
1973 prctl_map.start_data = mm->start_data;
1974 prctl_map.end_data = mm->end_data;
1975 prctl_map.start_brk = mm->start_brk;
1976 prctl_map.brk = mm->brk;
1977 prctl_map.start_stack = mm->start_stack;
1978 prctl_map.arg_start = mm->arg_start;
1979 prctl_map.arg_end = mm->arg_end;
1980 prctl_map.env_start = mm->env_start;
1981 prctl_map.env_end = mm->env_end;
1982 prctl_map.auxv = NULL;
1983 prctl_map.auxv_size = 0;
1984 prctl_map.exe_fd = -1;
1985
028ee4be
CG		 1986 switch (opt) {
1987 case PR_SET_MM_START_CODE:
4a00e9df 1988 prctl_map.start_code = addr;
fe8c7f5c 1989 break;
028ee4be 1990 case PR_SET_MM_END_CODE:
4a00e9df 1991 prctl_map.end_code = addr;
028ee4be 1992 break;
028ee4be 1993 case PR_SET_MM_START_DATA:
4a00e9df 1994 prctl_map.start_data = addr;
028ee4be 1995 break;
fe8c7f5c 1996 case PR_SET_MM_END_DATA:
4a00e9df
AD		 1997 prctl_map.end_data = addr;
1998 break;
1999 case PR_SET_MM_START_STACK:
2000 prctl_map.start_stack = addr;
028ee4be 2001 break;
028ee4be 2002 case PR_SET_MM_START_BRK:
4a00e9df 2003 prctl_map.start_brk = addr;
028ee4be 2004 break;
028ee4be 2005 case PR_SET_MM_BRK:
4a00e9df 2006 prctl_map.brk = addr;
028ee4be 2007 break;
4a00e9df
AD		 2008 case PR_SET_MM_ARG_START:
2009 prctl_map.arg_start = addr;
2010 break;
2011 case PR_SET_MM_ARG_END:
2012 prctl_map.arg_end = addr;
2013 break;
2014 case PR_SET_MM_ENV_START:
2015 prctl_map.env_start = addr;
2016 break;
2017 case PR_SET_MM_ENV_END:
2018 prctl_map.env_end = addr;
2019 break;
2020 default:
2021 goto out;
2022 }
2023
2024 error = validate_prctl_map(&prctl_map);
2025 if (error)
2026 goto out;
028ee4be 2027
4a00e9df 2028 switch (opt) {
fe8c7f5c
CG		 2029 /*
2030 * If command line arguments and environment
2031 * are placed somewhere else on stack, we can
2032 * set them up here, ARG_START/END to setup
2033 * command line argumets and ENV_START/END
2034 * for environment.
2035 */
2036 case PR_SET_MM_START_STACK:
2037 case PR_SET_MM_ARG_START:
2038 case PR_SET_MM_ARG_END:
2039 case PR_SET_MM_ENV_START:
2040 case PR_SET_MM_ENV_END:
2041 if (!vma) {
2042 error = -EFAULT;
2043 goto out;
2044 }
028ee4be
CG		 2045 }
2046
4a00e9df
AD		 2047 mm->start_code = prctl_map.start_code;
2048 mm->end_code = prctl_map.end_code;
2049 mm->start_data = prctl_map.start_data;
2050 mm->end_data = prctl_map.end_data;
2051 mm->start_brk = prctl_map.start_brk;
2052 mm->brk = prctl_map.brk;
2053 mm->start_stack = prctl_map.start_stack;
2054 mm->arg_start = prctl_map.arg_start;
2055 mm->arg_end = prctl_map.arg_end;
2056 mm->env_start = prctl_map.env_start;
2057 mm->env_end = prctl_map.env_end;
2058
028ee4be 2059 error = 0;
028ee4be 2060out:
e5e99792 2061 up_write(&mm->mmap_sem);
028ee4be
CG		 2062 return error;
2063}
300f786b 2064
52b36941 2065#ifdef CONFIG_CHECKPOINT_RESTORE
300f786b
CG		 2066static int prctl_get_tid_address(struct task_struct *me, int __user **tid_addr)
2067{
2068 return put_user(me->clear_child_tid, tid_addr);
2069}
52b36941 2070#else
300f786b
CG		 2071static int prctl_get_tid_address(struct task_struct *me, int __user **tid_addr)
2072{
2073 return -EINVAL;
2074}
028ee4be
CG		 2075#endif
2076
586278d7
CC		 2077#ifdef CONFIG_MMU
2078static int prctl_update_vma_anon_name(struct vm_area_struct *vma,
2079 struct vm_area_struct **prev,
2080 unsigned long start, unsigned long end,
2081 const char __user *name_addr)
2082{
2083 struct mm_struct *mm = vma->vm_mm;
2084 int error = 0;
2085 pgoff_t pgoff;
2086
2087 if (name_addr == vma_get_anon_name(vma)) {
2088 *prev = vma;
2089 goto out;
2090 }
2091
2092 pgoff = vma->vm_pgoff + ((start - vma->vm_start) >> PAGE_SHIFT);
2093 *prev = vma_merge(mm, *prev, start, end, vma->vm_flags, vma->anon_vma,
2094 vma->vm_file, pgoff, vma_policy(vma),
29a4f01d 2095 vma->vm_userfaultfd_ctx, name_addr);
586278d7
CC		 2096 if (*prev) {
2097 vma = *prev;
2098 goto success;
2099 }
2100
2101 *prev = vma;
2102
2103 if (start != vma->vm_start) {
2104 error = split_vma(mm, vma, start, 1);
2105 if (error)
2106 goto out;
2107 }
2108
2109 if (end != vma->vm_end) {
2110 error = split_vma(mm, vma, end, 0);
2111 if (error)
2112 goto out;
2113 }
2114
2115success:
2116 if (!vma->vm_file)
2117 vma->anon_name = name_addr;
2118
2119out:
2120 if (error == -ENOMEM)
2121 error = -EAGAIN;
2122 return error;
2123}
2124
2125static int prctl_set_vma_anon_name(unsigned long start, unsigned long end,
2126 unsigned long arg)
2127{
2128 unsigned long tmp;
2129 struct vm_area_struct *vma, *prev;
2130 int unmapped_error = 0;
2131 int error = -EINVAL;
2132
2133 /*
2134 * If the interval [start,end) covers some unmapped address
2135 * ranges, just ignore them, but return -ENOMEM at the end.
2136 * - this matches the handling in madvise.
2137 */
2138 vma = find_vma_prev(current->mm, start, &prev);
2139 if (vma && start > vma->vm_start)
2140 prev = vma;
2141
2142 for (;;) {
2143 /* Still start < end. */
2144 error = -ENOMEM;
2145 if (!vma)
2146 return error;
2147
2148 /* Here start < (end|vma->vm_end). */
2149 if (start < vma->vm_start) {
2150 unmapped_error = -ENOMEM;
2151 start = vma->vm_start;
2152 if (start >= end)
2153 return error;
2154 }
2155
2156 /* Here vma->vm_start <= start < (end|vma->vm_end) */
2157 tmp = vma->vm_end;
2158 if (end < tmp)
2159 tmp = end;
2160
2161 /* Here vma->vm_start <= start < tmp <= (end|vma->vm_end). */
2162 error = prctl_update_vma_anon_name(vma, &prev, start, tmp,
2163 (const char __user *)arg);
2164 if (error)
2165 return error;
2166 start = tmp;
2167 if (prev && start < prev->vm_end)
2168 start = prev->vm_end;
2169 error = unmapped_error;
2170 if (start >= end)
2171 return error;
2172 if (prev)
2173 vma = prev->vm_next;
2174 else /* madvise_remove dropped mmap_sem */
2175 vma = find_vma(current->mm, start);
2176 }
2177}
2178
2179static int prctl_set_vma(unsigned long opt, unsigned long start,
2180 unsigned long len_in, unsigned long arg)
2181{
2182 struct mm_struct *mm = current->mm;
2183 int error;
2184 unsigned long len;
2185 unsigned long end;
2186
2187 if (start & ~PAGE_MASK)
2188 return -EINVAL;
2189 len = (len_in + ~PAGE_MASK) & PAGE_MASK;
2190
2191 /* Check to see whether len was rounded up from small -ve to zero */
2192 if (len_in && !len)
2193 return -EINVAL;
2194
2195 end = start + len;
2196 if (end < start)
2197 return -EINVAL;
2198
2199 if (end == start)
2200 return 0;
2201
2202 down_write(&mm->mmap_sem);
2203
2204 switch (opt) {
2205 case PR_SET_VMA_ANON_NAME:
2206 error = prctl_set_vma_anon_name(start, end, arg);
2207 break;
2208 default:
2209 error = -EINVAL;
2210 }
2211
2212 up_write(&mm->mmap_sem);
2213
2214 return error;
2215}
2216#else /* CONFIG_MMU */
2217static int prctl_set_vma(unsigned long opt, unsigned long start,
2218 unsigned long len_in, unsigned long arg)
2219{
2220 return -EINVAL;
2221}
2222#endif
2223
c4ea37c2
HC		 2224SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
2225 unsigned long, arg4, unsigned long, arg5)
1da177e4 2226{
b6dff3ec 2227 struct task_struct *me = current;
f2902f90 2228 struct task_struct *tsk;
b6dff3ec
DH		 2229 unsigned char comm[sizeof(me->comm)];
2230 long error;
1da177e4 2231
d84f4f99
DH		 2232 error = security_task_prctl(option, arg2, arg3, arg4, arg5);
2233 if (error != -ENOSYS)
1da177e4
LT		 2234 return error;
2235
d84f4f99 2236 error = 0;
1da177e4 2237 switch (option) {
f3cbd435
AM		 2238 case PR_SET_PDEATHSIG:
2239 if (!valid_signal(arg2)) {
2240 error = -EINVAL;
1da177e4 2241 break;
f3cbd435
AM		 2242 }
2243 me->pdeath_signal = arg2;
2244 break;
2245 case PR_GET_PDEATHSIG:
2246 error = put_user(me->pdeath_signal, (int __user *)arg2);
2247 break;
2248 case PR_GET_DUMPABLE:
2249 error = get_dumpable(me->mm);
2250 break;
2251 case PR_SET_DUMPABLE:
2252 if (arg2 != SUID_DUMP_DISABLE && arg2 != SUID_DUMP_USER) {
2253 error = -EINVAL;
1da177e4 2254 break;
f3cbd435
AM		 2255 }
2256 set_dumpable(me->mm, arg2);
2257 break;
1da177e4 2258
f3cbd435
AM		 2259 case PR_SET_UNALIGN:
2260 error = SET_UNALIGN_CTL(me, arg2);
2261 break;
2262 case PR_GET_UNALIGN:
2263 error = GET_UNALIGN_CTL(me, arg2);
2264 break;
2265 case PR_SET_FPEMU:
2266 error = SET_FPEMU_CTL(me, arg2);
2267 break;
2268 case PR_GET_FPEMU:
2269 error = GET_FPEMU_CTL(me, arg2);
2270 break;
2271 case PR_SET_FPEXC:
2272 error = SET_FPEXC_CTL(me, arg2);
2273 break;
2274 case PR_GET_FPEXC:
2275 error = GET_FPEXC_CTL(me, arg2);
2276 break;
2277 case PR_GET_TIMING:
2278 error = PR_TIMING_STATISTICAL;
2279 break;
2280 case PR_SET_TIMING:
2281 if (arg2 != PR_TIMING_STATISTICAL)
2282 error = -EINVAL;
2283 break;
2284 case PR_SET_NAME:
2285 comm[sizeof(me->comm) - 1] = 0;
2286 if (strncpy_from_user(comm, (char __user *)arg2,
2287 sizeof(me->comm) - 1) < 0)
2288 return -EFAULT;
2289 set_task_comm(me, comm);
2290 proc_comm_connector(me);
2291 break;
2292 case PR_GET_NAME:
2293 get_task_comm(comm, me);
2294 if (copy_to_user((char __user *)arg2, comm, sizeof(comm)))
2295 return -EFAULT;
2296 break;
2297 case PR_GET_ENDIAN:
2298 error = GET_ENDIAN(me, arg2);
2299 break;
2300 case PR_SET_ENDIAN:
2301 error = SET_ENDIAN(me, arg2);
2302 break;
2303 case PR_GET_SECCOMP:
2304 error = prctl_get_seccomp();
2305 break;
2306 case PR_SET_SECCOMP:
2307 error = prctl_set_seccomp(arg2, (char __user *)arg3);
2308 break;
2309 case PR_GET_TSC:
2310 error = GET_TSC_CTL(arg2);
2311 break;
2312 case PR_SET_TSC:
2313 error = SET_TSC_CTL(arg2);
2314 break;
2315 case PR_TASK_PERF_EVENTS_DISABLE:
2316 error = perf_event_task_disable();
2317 break;
2318 case PR_TASK_PERF_EVENTS_ENABLE:
2319 error = perf_event_task_enable();
2320 break;
2321 case PR_GET_TIMERSLACK:
286d25ba
JS		 2322 if (current->timer_slack_ns > ULONG_MAX)
2323 error = ULONG_MAX;
2324 else
2325 error = current->timer_slack_ns;
f3cbd435
AM		 2326 break;
2327 case PR_SET_TIMERSLACK:
2328 if (arg2 <= 0)
2329 current->timer_slack_ns =
6976675d 2330 current->default_timer_slack_ns;
f3cbd435
AM		 2331 else
2332 current->timer_slack_ns = arg2;
2333 break;
2334 case PR_MCE_KILL:
2335 if (arg4 | arg5)
2336 return -EINVAL;
2337 switch (arg2) {
2338 case PR_MCE_KILL_CLEAR:
2339 if (arg3 != 0)
4db96cf0 2340 return -EINVAL;
f3cbd435 2341 current->flags &= ~PF_MCE_PROCESS;
4db96cf0 2342 break;
f3cbd435
AM		 2343 case PR_MCE_KILL_SET:
2344 current->flags |= PF_MCE_PROCESS;
2345 if (arg3 == PR_MCE_KILL_EARLY)
2346 current->flags |= PF_MCE_EARLY;
2347 else if (arg3 == PR_MCE_KILL_LATE)
2348 current->flags &= ~PF_MCE_EARLY;
2349 else if (arg3 == PR_MCE_KILL_DEFAULT)
2350 current->flags &=
2351 ~(PF_MCE_EARLY|PF_MCE_PROCESS);
1087e9b4 2352 else
259e5e6c 2353 return -EINVAL;
259e5e6c 2354 break;
1da177e4 2355 default:
f3cbd435
AM		 2356 return -EINVAL;
2357 }
2358 break;
2359 case PR_MCE_KILL_GET:
2360 if (arg2 | arg3 | arg4 | arg5)
2361 return -EINVAL;
2362 if (current->flags & PF_MCE_PROCESS)
2363 error = (current->flags & PF_MCE_EARLY) ?
2364 PR_MCE_KILL_EARLY : PR_MCE_KILL_LATE;
2365 else
2366 error = PR_MCE_KILL_DEFAULT;
2367 break;
2368 case PR_SET_MM:
2369 error = prctl_set_mm(arg2, arg3, arg4, arg5);
2370 break;
2371 case PR_GET_TID_ADDRESS:
2372 error = prctl_get_tid_address(me, (int __user **)arg2);
2373 break;
18f42f60 2374 case PR_SET_TIMERSLACK_PID:
d4d049c5 2375 if (task_pid_vnr(current) != (pid_t)arg3 &&
18f42f60
MK		 2376 !capable(CAP_SYS_NICE))
2377 return -EPERM;
2378 rcu_read_lock();
d4d049c5 2379 tsk = find_task_by_vpid((pid_t)arg3);
18f42f60
MK		 2380 if (tsk == NULL) {
2381 rcu_read_unlock();
2382 return -EINVAL;
2383 }
2384 get_task_struct(tsk);
2385 rcu_read_unlock();
2386 if (arg2 <= 0)
2387 tsk->timer_slack_ns =
2388 tsk->default_timer_slack_ns;
2389 else
2390 tsk->timer_slack_ns = arg2;
2391 put_task_struct(tsk);
2392 error = 0;
2393 break;
f3cbd435
AM		 2394 case PR_SET_CHILD_SUBREAPER:
2395 me->signal->is_child_subreaper = !!arg2;
2396 break;
2397 case PR_GET_CHILD_SUBREAPER:
2398 error = put_user(me->signal->is_child_subreaper,
2399 (int __user *)arg2);
2400 break;
2401 case PR_SET_NO_NEW_PRIVS:
2402 if (arg2 != 1 || arg3 || arg4 || arg5)
2403 return -EINVAL;
2404
1d4457f9 2405 task_set_no_new_privs(current);
f3cbd435
AM		 2406 break;
2407 case PR_GET_NO_NEW_PRIVS:
2408 if (arg2 || arg3 || arg4 || arg5)
2409 return -EINVAL;
1d4457f9 2410 return task_no_new_privs(current) ? 1 : 0;
a0715cc2
AT		 2411 case PR_GET_THP_DISABLE:
2412 if (arg2 || arg3 || arg4 || arg5)
2413 return -EINVAL;
2414 error = !!(me->mm->def_flags & VM_NOHUGEPAGE);
2415 break;
2416 case PR_SET_THP_DISABLE:
2417 if (arg3 || arg4 || arg5)
2418 return -EINVAL;
2419 down_write(&me->mm->mmap_sem);
2420 if (arg2)
2421 me->mm->def_flags |= VM_NOHUGEPAGE;
2422 else
2423 me->mm->def_flags &= ~VM_NOHUGEPAGE;
2424 up_write(&me->mm->mmap_sem);
2425 break;
fe3d197f 2426 case PR_MPX_ENABLE_MANAGEMENT:
e9d1b4f3
DH		 2427 if (arg2 || arg3 || arg4 || arg5)
2428 return -EINVAL;
46a6e0cf 2429 error = MPX_ENABLE_MANAGEMENT();
fe3d197f
DH		 2430 break;
2431 case PR_MPX_DISABLE_MANAGEMENT:
e9d1b4f3
DH		 2432 if (arg2 || arg3 || arg4 || arg5)
2433 return -EINVAL;
46a6e0cf 2434 error = MPX_DISABLE_MANAGEMENT();
fe3d197f 2435 break;
9791554b
PB		 2436 case PR_SET_FP_MODE:
2437 error = SET_FP_MODE(me, arg2);
2438 break;
2439 case PR_GET_FP_MODE:
2440 error = GET_FP_MODE(me);
2441 break;
586278d7
CC		 2442 case PR_SET_VMA:
2443 error = prctl_set_vma(arg2, arg3, arg4, arg5);
2444 break;
f3cbd435
AM		 2445 default:
2446 error = -EINVAL;
2447 break;
1da177e4
LT		 2448 }
2449 return error;
2450}
3cfc348b 2451
836f92ad
HC		 2452SYSCALL_DEFINE3(getcpu, unsigned __user *, cpup, unsigned __user *, nodep,
2453 struct getcpu_cache __user *, unused)
3cfc348b
AK		 2454{
2455 int err = 0;
2456 int cpu = raw_smp_processor_id();
ec94fc3d 2457
3cfc348b
AK		 2458 if (cpup)
2459 err |= put_user(cpu, cpup);
2460 if (nodep)
2461 err |= put_user(cpu_to_node(cpu), nodep);
3cfc348b
AK		 2462 return err ? -EFAULT : 0;
2463}
10a0a8d4 2464
4a22f166
SR		 2465/**
2466 * do_sysinfo - fill in sysinfo struct
2467 * @info: pointer to buffer to fill
2468 */
2469static int do_sysinfo(struct sysinfo *info)
2470{
2471 unsigned long mem_total, sav_total;
2472 unsigned int mem_unit, bitcount;
2473 struct timespec tp;
2474
2475 memset(info, 0, sizeof(struct sysinfo));
2476
45c64940 2477 get_monotonic_boottime(&tp);
4a22f166
SR		 2478 info->uptime = tp.tv_sec + (tp.tv_nsec ? 1 : 0);
2479
2480 get_avenrun(info->loads, 0, SI_LOAD_SHIFT - FSHIFT);
2481
2482 info->procs = nr_threads;
2483
2484 si_meminfo(info);
2485 si_swapinfo(info);
2486
2487 /*
2488 * If the sum of all the available memory (i.e. ram + swap)
2489 * is less than can be stored in a 32 bit unsigned long then
2490 * we can be binary compatible with 2.2.x kernels. If not,
2491 * well, in that case 2.2.x was broken anyways...
2492 *
2493 * -Erik Andersen <andersee@debian.org>
2494 */
2495
2496 mem_total = info->totalram + info->totalswap;
2497 if (mem_total < info->totalram || mem_total < info->totalswap)
2498 goto out;
2499 bitcount = 0;
2500 mem_unit = info->mem_unit;
2501 while (mem_unit > 1) {
2502 bitcount++;
2503 mem_unit >>= 1;
2504 sav_total = mem_total;
2505 mem_total <<= 1;
2506 if (mem_total < sav_total)
2507 goto out;
2508 }
2509
2510 /*
2511 * If mem_total did not overflow, multiply all memory values by
2512 * info->mem_unit and set it to 1. This leaves things compatible
2513 * with 2.2.x, and also retains compatibility with earlier 2.4.x
2514 * kernels...
2515 */
2516
2517 info->mem_unit = 1;
2518 info->totalram <<= bitcount;
2519 info->freeram <<= bitcount;
2520 info->sharedram <<= bitcount;
2521 info->bufferram <<= bitcount;
2522 info->totalswap <<= bitcount;
2523 info->freeswap <<= bitcount;
2524 info->totalhigh <<= bitcount;
2525 info->freehigh <<= bitcount;
2526
2527out:
2528 return 0;
2529}
2530
2531SYSCALL_DEFINE1(sysinfo, struct sysinfo __user *, info)
2532{
2533 struct sysinfo val;
2534
2535 do_sysinfo(&val);
2536
2537 if (copy_to_user(info, &val, sizeof(struct sysinfo)))
2538 return -EFAULT;
2539
2540 return 0;
2541}
2542
2543#ifdef CONFIG_COMPAT
2544struct compat_sysinfo {
2545 s32 uptime;
2546 u32 loads[3];
2547 u32 totalram;
2548 u32 freeram;
2549 u32 sharedram;
2550 u32 bufferram;
2551 u32 totalswap;
2552 u32 freeswap;
2553 u16 procs;
2554 u16 pad;
2555 u32 totalhigh;
2556 u32 freehigh;
2557 u32 mem_unit;
2558 char _f[20-2*sizeof(u32)-sizeof(int)];
2559};
2560
2561COMPAT_SYSCALL_DEFINE1(sysinfo, struct compat_sysinfo __user *, info)
2562{
2563 struct sysinfo s;
2564
2565 do_sysinfo(&s);
2566
2567 /* Check to see if any memory value is too large for 32-bit and scale
2568 * down if needed
2569 */
0baae41e 2570 if (upper_32_bits(s.totalram) || upper_32_bits(s.totalswap)) {
4a22f166
SR		 2571 int bitcount = 0;
2572
2573 while (s.mem_unit < PAGE_SIZE) {
2574 s.mem_unit <<= 1;
2575 bitcount++;
2576 }
2577
2578 s.totalram >>= bitcount;
2579 s.freeram >>= bitcount;
2580 s.sharedram >>= bitcount;
2581 s.bufferram >>= bitcount;
2582 s.totalswap >>= bitcount;
2583 s.freeswap >>= bitcount;
2584 s.totalhigh >>= bitcount;
2585 s.freehigh >>= bitcount;
2586 }
2587
2588 if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
2589 __put_user(s.uptime, &info->uptime) ||
2590 __put_user(s.loads[0], &info->loads[0]) ||
2591 __put_user(s.loads[1], &info->loads[1]) ||
2592 __put_user(s.loads[2], &info->loads[2]) ||
2593 __put_user(s.totalram, &info->totalram) ||
2594 __put_user(s.freeram, &info->freeram) ||
2595 __put_user(s.sharedram, &info->sharedram) ||
2596 __put_user(s.bufferram, &info->bufferram) ||
2597 __put_user(s.totalswap, &info->totalswap) ||
2598 __put_user(s.freeswap, &info->freeswap) ||
2599 __put_user(s.procs, &info->procs) ||
2600 __put_user(s.totalhigh, &info->totalhigh) ||
2601 __put_user(s.freehigh, &info->freehigh) ||
2602 __put_user(s.mem_unit, &info->mem_unit))
2603 return -EFAULT;
2604
2605 return 0;
2606}
2607#endif /* CONFIG_COMPAT */