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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>
1da177e4
LT		 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>
1446e1df 44#include <linux/syscall_user_dispatch.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>
ecc421e0 50#include <linux/time_namespace.h>
7fe5e042 51#include <linux/binfmts.h>
1da177e4 52
4a22f166 53#include <linux/sched.h>
4eb5aaa3 54#include <linux/sched/autogroup.h>
4f17722c 55#include <linux/sched/loadavg.h>
03441a34 56#include <linux/sched/stat.h>
6e84f315 57#include <linux/sched/mm.h>
f7ccbae4 58#include <linux/sched/coredump.h>
29930025 59#include <linux/sched/task.h>
32ef5517 60#include <linux/sched/cputime.h>
4a22f166
SR		 61#include <linux/rcupdate.h>
62#include <linux/uidgid.h>
63#include <linux/cred.h>
64
b617cfc8
TG		 65#include <linux/nospec.h>
66
04c6862c 67#include <linux/kmsg_dump.h>
be27425d
AK		 68/* Move somewhere else to avoid recompiling? */
69#include <generated/utsrelease.h>
04c6862c 70
7c0f6ba6 71#include <linux/uaccess.h>
1da177e4
LT		 72#include <asm/io.h>
73#include <asm/unistd.h>
74
e530dca5
DB		 75#include "uid16.h"
76
1da177e4 77#ifndef SET_UNALIGN_CTL
ec94fc3d 78# define SET_UNALIGN_CTL(a, b) (-EINVAL)
1da177e4
LT		 79#endif
80#ifndef GET_UNALIGN_CTL
ec94fc3d 81# define GET_UNALIGN_CTL(a, b) (-EINVAL)
1da177e4
LT		 82#endif
83#ifndef SET_FPEMU_CTL
ec94fc3d 84# define SET_FPEMU_CTL(a, b) (-EINVAL)
1da177e4
LT		 85#endif
86#ifndef GET_FPEMU_CTL
ec94fc3d 87# define GET_FPEMU_CTL(a, b) (-EINVAL)
1da177e4
LT		 88#endif
89#ifndef SET_FPEXC_CTL
ec94fc3d 90# define SET_FPEXC_CTL(a, b) (-EINVAL)
1da177e4
LT		 91#endif
92#ifndef GET_FPEXC_CTL
ec94fc3d 93# define GET_FPEXC_CTL(a, b) (-EINVAL)
1da177e4 94#endif
651d765d 95#ifndef GET_ENDIAN
ec94fc3d 96# define GET_ENDIAN(a, b) (-EINVAL)
651d765d
AB		 97#endif
98#ifndef SET_ENDIAN
ec94fc3d 99# define SET_ENDIAN(a, b) (-EINVAL)
651d765d 100#endif
8fb402bc
EB		 101#ifndef GET_TSC_CTL
102# define GET_TSC_CTL(a) (-EINVAL)
103#endif
104#ifndef SET_TSC_CTL
105# define SET_TSC_CTL(a) (-EINVAL)
106#endif
9791554b
PB		 107#ifndef GET_FP_MODE
108# define GET_FP_MODE(a) (-EINVAL)
109#endif
110#ifndef SET_FP_MODE
111# define SET_FP_MODE(a,b) (-EINVAL)
112#endif
2d2123bc
DM		 113#ifndef SVE_SET_VL
114# define SVE_SET_VL(a) (-EINVAL)
115#endif
116#ifndef SVE_GET_VL
117# define SVE_GET_VL() (-EINVAL)
118#endif
ba830885
KM		 119#ifndef PAC_RESET_KEYS
120# define PAC_RESET_KEYS(a, b) (-EINVAL)
121#endif
20169862
PC		 122#ifndef PAC_SET_ENABLED_KEYS
123# define PAC_SET_ENABLED_KEYS(a, b, c) (-EINVAL)
124#endif
125#ifndef PAC_GET_ENABLED_KEYS
126# define PAC_GET_ENABLED_KEYS(a) (-EINVAL)
127#endif
63f0c603
CM		 128#ifndef SET_TAGGED_ADDR_CTRL
129# define SET_TAGGED_ADDR_CTRL(a) (-EINVAL)
130#endif
131#ifndef GET_TAGGED_ADDR_CTRL
132# define GET_TAGGED_ADDR_CTRL() (-EINVAL)
133#endif
1da177e4
LT		 134
135/*
136 * this is where the system-wide overflow UID and GID are defined, for
137 * architectures that now have 32-bit UID/GID but didn't in the past
138 */
139
140int overflowuid = DEFAULT_OVERFLOWUID;
141int overflowgid = DEFAULT_OVERFLOWGID;
142
1da177e4
LT		 143EXPORT_SYMBOL(overflowuid);
144EXPORT_SYMBOL(overflowgid);
1da177e4
LT		 145
146/*
147 * the same as above, but for filesystems which can only store a 16-bit
148 * UID and GID. as such, this is needed on all architectures
149 */
150
151int fs_overflowuid = DEFAULT_FS_OVERFLOWUID;
8b2770a4 152int fs_overflowgid = DEFAULT_FS_OVERFLOWGID;
1da177e4
LT		 153
154EXPORT_SYMBOL(fs_overflowuid);
155EXPORT_SYMBOL(fs_overflowgid);
156
fc832ad3
SH		 157/*
158 * Returns true if current's euid is same as p's uid or euid,
159 * or has CAP_SYS_NICE to p's user_ns.
160 *
161 * Called with rcu_read_lock, creds are safe
162 */
163static bool set_one_prio_perm(struct task_struct *p)
164{
165 const struct cred *cred = current_cred(), *pcred = __task_cred(p);
166
5af66203
EB		 167 if (uid_eq(pcred->uid, cred->euid) ||
168 uid_eq(pcred->euid, cred->euid))
fc832ad3 169 return true;
c4a4d603 170 if (ns_capable(pcred->user_ns, CAP_SYS_NICE))
fc832ad3
SH		 171 return true;
172 return false;
173}
174
c69e8d9c
DH		 175/*
176 * set the priority of a task
177 * - the caller must hold the RCU read lock
178 */
1da177e4
LT		 179static int set_one_prio(struct task_struct *p, int niceval, int error)
180{
181 int no_nice;
182
fc832ad3 183 if (!set_one_prio_perm(p)) {
1da177e4
LT		 184 error = -EPERM;
185 goto out;
186 }
e43379f1 187 if (niceval < task_nice(p) && !can_nice(p, niceval)) {
1da177e4
LT		 188 error = -EACCES;
189 goto out;
190 }
191 no_nice = security_task_setnice(p, niceval);
192 if (no_nice) {
193 error = no_nice;
194 goto out;
195 }
196 if (error == -ESRCH)
197 error = 0;
198 set_user_nice(p, niceval);
199out:
200 return error;
201}
202
754fe8d2 203SYSCALL_DEFINE3(setpriority, int, which, int, who, int, niceval)
1da177e4
LT		 204{
205 struct task_struct *g, *p;
206 struct user_struct *user;
86a264ab 207 const struct cred *cred = current_cred();
1da177e4 208 int error = -EINVAL;
41487c65 209 struct pid *pgrp;
7b44ab97 210 kuid_t uid;
1da177e4 211
3e88c553 212 if (which > PRIO_USER || which < PRIO_PROCESS)
1da177e4
LT		 213 goto out;
214
215 /* normalize: avoid signed division (rounding problems) */
216 error = -ESRCH;
c4a4d2f4
DY		 217 if (niceval < MIN_NICE)
218 niceval = MIN_NICE;
219 if (niceval > MAX_NICE)
220 niceval = MAX_NICE;
1da177e4 221
d4581a23 222 rcu_read_lock();
1da177e4
LT		 223 read_lock(&tasklist_lock);
224 switch (which) {
ec94fc3d 225 case PRIO_PROCESS:
226 if (who)
227 p = find_task_by_vpid(who);
228 else
229 p = current;
230 if (p)
231 error = set_one_prio(p, niceval, error);
232 break;
233 case PRIO_PGRP:
234 if (who)
235 pgrp = find_vpid(who);
236 else
237 pgrp = task_pgrp(current);
238 do_each_pid_thread(pgrp, PIDTYPE_PGID, p) {
239 error = set_one_prio(p, niceval, error);
240 } while_each_pid_thread(pgrp, PIDTYPE_PGID, p);
241 break;
242 case PRIO_USER:
243 uid = make_kuid(cred->user_ns, who);
244 user = cred->user;
245 if (!who)
246 uid = cred->uid;
247 else if (!uid_eq(uid, cred->uid)) {
248 user = find_user(uid);
249 if (!user)
86a264ab 250 goto out_unlock; /* No processes for this user */
ec94fc3d 251 }
252 do_each_thread(g, p) {
8639b461 253 if (uid_eq(task_uid(p), uid) && task_pid_vnr(p))
ec94fc3d 254 error = set_one_prio(p, niceval, error);
255 } while_each_thread(g, p);
256 if (!uid_eq(uid, cred->uid))
257 free_uid(user); /* For find_user() */
258 break;
1da177e4
LT		 259 }
260out_unlock:
261 read_unlock(&tasklist_lock);
d4581a23 262 rcu_read_unlock();
1da177e4
LT		 263out:
264 return error;
265}
266
267/*
268 * Ugh. To avoid negative return values, "getpriority()" will
269 * not return the normal nice-value, but a negated value that
270 * has been offset by 20 (ie it returns 40..1 instead of -20..19)
271 * to stay compatible.
272 */
754fe8d2 273SYSCALL_DEFINE2(getpriority, int, which, int, who)
1da177e4
LT		 274{
275 struct task_struct *g, *p;
276 struct user_struct *user;
86a264ab 277 const struct cred *cred = current_cred();
1da177e4 278 long niceval, retval = -ESRCH;
41487c65 279 struct pid *pgrp;
7b44ab97 280 kuid_t uid;
1da177e4 281
3e88c553 282 if (which > PRIO_USER || which < PRIO_PROCESS)
1da177e4
LT		 283 return -EINVAL;
284
70118837 285 rcu_read_lock();
1da177e4
LT		 286 read_lock(&tasklist_lock);
287 switch (which) {
ec94fc3d 288 case PRIO_PROCESS:
289 if (who)
290 p = find_task_by_vpid(who);
291 else
292 p = current;
293 if (p) {
294 niceval = nice_to_rlimit(task_nice(p));
295 if (niceval > retval)
296 retval = niceval;
297 }
298 break;
299 case PRIO_PGRP:
300 if (who)
301 pgrp = find_vpid(who);
302 else
303 pgrp = task_pgrp(current);
304 do_each_pid_thread(pgrp, PIDTYPE_PGID, p) {
305 niceval = nice_to_rlimit(task_nice(p));
306 if (niceval > retval)
307 retval = niceval;
308 } while_each_pid_thread(pgrp, PIDTYPE_PGID, p);
309 break;
310 case PRIO_USER:
311 uid = make_kuid(cred->user_ns, who);
312 user = cred->user;
313 if (!who)
314 uid = cred->uid;
315 else if (!uid_eq(uid, cred->uid)) {
316 user = find_user(uid);
317 if (!user)
318 goto out_unlock; /* No processes for this user */
319 }
320 do_each_thread(g, p) {
8639b461 321 if (uid_eq(task_uid(p), uid) && task_pid_vnr(p)) {
7aa2c016 322 niceval = nice_to_rlimit(task_nice(p));
1da177e4
LT		 323 if (niceval > retval)
324 retval = niceval;
325 }
ec94fc3d 326 } while_each_thread(g, p);
327 if (!uid_eq(uid, cred->uid))
328 free_uid(user); /* for find_user() */
329 break;
1da177e4
LT		 330 }
331out_unlock:
332 read_unlock(&tasklist_lock);
70118837 333 rcu_read_unlock();
1da177e4
LT		 334
335 return retval;
336}
337
1da177e4
LT		 338/*
339 * Unprivileged users may change the real gid to the effective gid
340 * or vice versa. (BSD-style)
341 *
342 * If you set the real gid at all, or set the effective gid to a value not
343 * equal to the real gid, then the saved gid is set to the new effective gid.
344 *
345 * This makes it possible for a setgid program to completely drop its
346 * privileges, which is often a useful assertion to make when you are doing
347 * a security audit over a program.
348 *
349 * The general idea is that a program which uses just setregid() will be
350 * 100% compatible with BSD. A program which uses just setgid() will be
ec94fc3d 351 * 100% compatible with POSIX with saved IDs.
1da177e4
LT		 352 *
353 * SMP: There are not races, the GIDs are checked only by filesystem
354 * operations (as far as semantic preservation is concerned).
355 */
2813893f 356#ifdef CONFIG_MULTIUSER
e530dca5 357long __sys_setregid(gid_t rgid, gid_t egid)
1da177e4 358{
a29c33f4 359 struct user_namespace *ns = current_user_ns();
d84f4f99
DH		 360 const struct cred *old;
361 struct cred *new;
1da177e4 362 int retval;
a29c33f4
EB		 363 kgid_t krgid, kegid;
364
365 krgid = make_kgid(ns, rgid);
366 kegid = make_kgid(ns, egid);
367
368 if ((rgid != (gid_t) -1) && !gid_valid(krgid))
369 return -EINVAL;
370 if ((egid != (gid_t) -1) && !gid_valid(kegid))
371 return -EINVAL;
1da177e4 372
d84f4f99
DH		 373 new = prepare_creds();
374 if (!new)
375 return -ENOMEM;
376 old = current_cred();
377
d84f4f99 378 retval = -EPERM;
1da177e4 379 if (rgid != (gid_t) -1) {
a29c33f4
EB		 380 if (gid_eq(old->gid, krgid) ||
381 gid_eq(old->egid, krgid) ||
111767c1 382 ns_capable_setid(old->user_ns, CAP_SETGID))
a29c33f4 383 new->gid = krgid;
1da177e4 384 else
d84f4f99 385 goto error;
1da177e4
LT		 386 }
387 if (egid != (gid_t) -1) {
a29c33f4
EB		 388 if (gid_eq(old->gid, kegid) ||
389 gid_eq(old->egid, kegid) ||
390 gid_eq(old->sgid, kegid) ||
111767c1 391 ns_capable_setid(old->user_ns, CAP_SETGID))
a29c33f4 392 new->egid = kegid;
756184b7 393 else
d84f4f99 394 goto error;
1da177e4 395 }
d84f4f99 396
1da177e4 397 if (rgid != (gid_t) -1 ||
a29c33f4 398 (egid != (gid_t) -1 && !gid_eq(kegid, old->gid)))
d84f4f99
DH		 399 new->sgid = new->egid;
400 new->fsgid = new->egid;
401
39030e13
TC		 402 retval = security_task_fix_setgid(new, old, LSM_SETID_RE);
403 if (retval < 0)
404 goto error;
405
d84f4f99
DH		 406 return commit_creds(new);
407
408error:
409 abort_creds(new);
410 return retval;
1da177e4
LT		 411}
412
e530dca5
DB		 413SYSCALL_DEFINE2(setregid, gid_t, rgid, gid_t, egid)
414{
415 return __sys_setregid(rgid, egid);
416}
417
1da177e4 418/*
ec94fc3d 419 * setgid() is implemented like SysV w/ SAVED_IDS
1da177e4
LT		 420 *
421 * SMP: Same implicit races as above.
422 */
e530dca5 423long __sys_setgid(gid_t gid)
1da177e4 424{
a29c33f4 425 struct user_namespace *ns = current_user_ns();
d84f4f99
DH		 426 const struct cred *old;
427 struct cred *new;
1da177e4 428 int retval;
a29c33f4
EB		 429 kgid_t kgid;
430
431 kgid = make_kgid(ns, gid);
432 if (!gid_valid(kgid))
433 return -EINVAL;
1da177e4 434
d84f4f99
DH		 435 new = prepare_creds();
436 if (!new)
437 return -ENOMEM;
438 old = current_cred();
439
d84f4f99 440 retval = -EPERM;
111767c1 441 if (ns_capable_setid(old->user_ns, CAP_SETGID))
a29c33f4
EB		 442 new->gid = new->egid = new->sgid = new->fsgid = kgid;
443 else if (gid_eq(kgid, old->gid) || gid_eq(kgid, old->sgid))
444 new->egid = new->fsgid = kgid;
1da177e4 445 else
d84f4f99 446 goto error;
1da177e4 447
39030e13
TC		 448 retval = security_task_fix_setgid(new, old, LSM_SETID_ID);
449 if (retval < 0)
450 goto error;
451
d84f4f99
DH		 452 return commit_creds(new);
453
454error:
455 abort_creds(new);
456 return retval;
1da177e4 457}
54e99124 458
e530dca5
DB		 459SYSCALL_DEFINE1(setgid, gid_t, gid)
460{
461 return __sys_setgid(gid);
462}
463
d84f4f99
DH		 464/*
465 * change the user struct in a credentials set to match the new UID
466 */
467static int set_user(struct cred *new)
1da177e4
LT		 468{
469 struct user_struct *new_user;
470
078de5f7 471 new_user = alloc_uid(new->uid);
1da177e4
LT		 472 if (!new_user)
473 return -EAGAIN;
474
72fa5997
VK		 475 /*
476 * We don't fail in case of NPROC limit excess here because too many
477 * poorly written programs don't check set*uid() return code, assuming
478 * it never fails if called by root. We may still enforce NPROC limit
479 * for programs doing set*uid()+execve() by harmlessly deferring the
480 * failure to the execve() stage.
481 */
21d1c5e3 482 if (is_ucounts_overlimit(new->ucounts, UCOUNT_RLIMIT_NPROC, rlimit(RLIMIT_NPROC)) &&
2863643f
RX		 483 new_user != INIT_USER &&
484 !capable(CAP_SYS_RESOURCE) && !capable(CAP_SYS_ADMIN))
72fa5997
VK		 485 current->flags |= PF_NPROC_EXCEEDED;
486 else
487 current->flags &= ~PF_NPROC_EXCEEDED;
1da177e4 488
d84f4f99
DH		 489 free_uid(new->user);
490 new->user = new_user;
1da177e4
LT		 491 return 0;
492}
493
494/*
495 * Unprivileged users may change the real uid to the effective uid
496 * or vice versa. (BSD-style)
497 *
498 * If you set the real uid at all, or set the effective uid to a value not
499 * equal to the real uid, then the saved uid is set to the new effective uid.
500 *
501 * This makes it possible for a setuid program to completely drop its
502 * privileges, which is often a useful assertion to make when you are doing
503 * a security audit over a program.
504 *
505 * The general idea is that a program which uses just setreuid() will be
506 * 100% compatible with BSD. A program which uses just setuid() will be
ec94fc3d 507 * 100% compatible with POSIX with saved IDs.
1da177e4 508 */
e530dca5 509long __sys_setreuid(uid_t ruid, uid_t euid)
1da177e4 510{
a29c33f4 511 struct user_namespace *ns = current_user_ns();
d84f4f99
DH		 512 const struct cred *old;
513 struct cred *new;
1da177e4 514 int retval;
a29c33f4
EB		 515 kuid_t kruid, keuid;
516
517 kruid = make_kuid(ns, ruid);
518 keuid = make_kuid(ns, euid);
519
520 if ((ruid != (uid_t) -1) && !uid_valid(kruid))
521 return -EINVAL;
522 if ((euid != (uid_t) -1) && !uid_valid(keuid))
523 return -EINVAL;
1da177e4 524
d84f4f99
DH		 525 new = prepare_creds();
526 if (!new)
527 return -ENOMEM;
528 old = current_cred();
529
d84f4f99 530 retval = -EPERM;
1da177e4 531 if (ruid != (uid_t) -1) {
a29c33f4
EB		 532 new->uid = kruid;
533 if (!uid_eq(old->uid, kruid) &&
534 !uid_eq(old->euid, kruid) &&
40852275 535 !ns_capable_setid(old->user_ns, CAP_SETUID))
d84f4f99 536 goto error;
1da177e4
LT		 537 }
538
539 if (euid != (uid_t) -1) {
a29c33f4
EB		 540 new->euid = keuid;
541 if (!uid_eq(old->uid, keuid) &&
542 !uid_eq(old->euid, keuid) &&
543 !uid_eq(old->suid, keuid) &&
40852275 544 !ns_capable_setid(old->user_ns, CAP_SETUID))
d84f4f99 545 goto error;
1da177e4
LT		 546 }
547
a29c33f4 548 if (!uid_eq(new->uid, old->uid)) {
54e99124
DG		 549 retval = set_user(new);
550 if (retval < 0)
551 goto error;
552 }
1da177e4 553 if (ruid != (uid_t) -1 ||
a29c33f4 554 (euid != (uid_t) -1 && !uid_eq(keuid, old->uid)))
d84f4f99
DH		 555 new->suid = new->euid;
556 new->fsuid = new->euid;
1da177e4 557
d84f4f99
DH		 558 retval = security_task_fix_setuid(new, old, LSM_SETID_RE);
559 if (retval < 0)
560 goto error;
1da177e4 561
905ae01c
AG		 562 retval = set_cred_ucounts(new);
563 if (retval < 0)
564 goto error;
565
d84f4f99 566 return commit_creds(new);
1da177e4 567
d84f4f99
DH		 568error:
569 abort_creds(new);
570 return retval;
571}
ec94fc3d 572
e530dca5
DB		 573SYSCALL_DEFINE2(setreuid, uid_t, ruid, uid_t, euid)
574{
575 return __sys_setreuid(ruid, euid);
576}
577
1da177e4 578/*
ec94fc3d 579 * setuid() is implemented like SysV with SAVED_IDS
580 *
1da177e4 581 * Note that SAVED_ID's is deficient in that a setuid root program
ec94fc3d 582 * like sendmail, for example, cannot set its uid to be a normal
1da177e4
LT		 583 * user and then switch back, because if you're root, setuid() sets
584 * the saved uid too. If you don't like this, blame the bright people
585 * in the POSIX committee and/or USG. Note that the BSD-style setreuid()
586 * will allow a root program to temporarily drop privileges and be able to
ec94fc3d 587 * regain them by swapping the real and effective uid.
1da177e4 588 */
e530dca5 589long __sys_setuid(uid_t uid)
1da177e4 590{
a29c33f4 591 struct user_namespace *ns = current_user_ns();
d84f4f99
DH		 592 const struct cred *old;
593 struct cred *new;
1da177e4 594 int retval;
a29c33f4
EB		 595 kuid_t kuid;
596
597 kuid = make_kuid(ns, uid);
598 if (!uid_valid(kuid))
599 return -EINVAL;
1da177e4 600
d84f4f99
DH		 601 new = prepare_creds();
602 if (!new)
603 return -ENOMEM;
604 old = current_cred();
605
d84f4f99 606 retval = -EPERM;
40852275 607 if (ns_capable_setid(old->user_ns, CAP_SETUID)) {
a29c33f4
EB		 608 new->suid = new->uid = kuid;
609 if (!uid_eq(kuid, old->uid)) {
54e99124
DG		 610 retval = set_user(new);
611 if (retval < 0)
612 goto error;
d84f4f99 613 }
a29c33f4 614 } else if (!uid_eq(kuid, old->uid) && !uid_eq(kuid, new->suid)) {
d84f4f99 615 goto error;
1da177e4 616 }
1da177e4 617
a29c33f4 618 new->fsuid = new->euid = kuid;
d84f4f99
DH		 619
620 retval = security_task_fix_setuid(new, old, LSM_SETID_ID);
621 if (retval < 0)
622 goto error;
1da177e4 623
905ae01c
AG		 624 retval = set_cred_ucounts(new);
625 if (retval < 0)
626 goto error;
627
d84f4f99 628 return commit_creds(new);
1da177e4 629
d84f4f99
DH		 630error:
631 abort_creds(new);
632 return retval;
1da177e4
LT		 633}
634
e530dca5
DB		 635SYSCALL_DEFINE1(setuid, uid_t, uid)
636{
637 return __sys_setuid(uid);
638}
639
1da177e4
LT		 640
641/*
642 * This function implements a generic ability to update ruid, euid,
643 * and suid. This allows you to implement the 4.4 compatible seteuid().
644 */
e530dca5 645long __sys_setresuid(uid_t ruid, uid_t euid, uid_t suid)
1da177e4 646{
a29c33f4 647 struct user_namespace *ns = current_user_ns();
d84f4f99
DH		 648 const struct cred *old;
649 struct cred *new;
1da177e4 650 int retval;
a29c33f4
EB		 651 kuid_t kruid, keuid, ksuid;
652
653 kruid = make_kuid(ns, ruid);
654 keuid = make_kuid(ns, euid);
655 ksuid = make_kuid(ns, suid);
656
657 if ((ruid != (uid_t) -1) && !uid_valid(kruid))
658 return -EINVAL;
659
660 if ((euid != (uid_t) -1) && !uid_valid(keuid))
661 return -EINVAL;
662
663 if ((suid != (uid_t) -1) && !uid_valid(ksuid))
664 return -EINVAL;
1da177e4 665
d84f4f99
DH		 666 new = prepare_creds();
667 if (!new)
668 return -ENOMEM;
669
d84f4f99 670 old = current_cred();
1da177e4 671
d84f4f99 672 retval = -EPERM;
40852275 673 if (!ns_capable_setid(old->user_ns, CAP_SETUID)) {
a29c33f4
EB		 674 if (ruid != (uid_t) -1 && !uid_eq(kruid, old->uid) &&
675 !uid_eq(kruid, old->euid) && !uid_eq(kruid, old->suid))
d84f4f99 676 goto error;
a29c33f4
EB		 677 if (euid != (uid_t) -1 && !uid_eq(keuid, old->uid) &&
678 !uid_eq(keuid, old->euid) && !uid_eq(keuid, old->suid))
d84f4f99 679 goto error;
a29c33f4
EB		 680 if (suid != (uid_t) -1 && !uid_eq(ksuid, old->uid) &&
681 !uid_eq(ksuid, old->euid) && !uid_eq(ksuid, old->suid))
d84f4f99 682 goto error;
1da177e4 683 }
d84f4f99 684
1da177e4 685 if (ruid != (uid_t) -1) {
a29c33f4
EB		 686 new->uid = kruid;
687 if (!uid_eq(kruid, old->uid)) {
54e99124
DG		 688 retval = set_user(new);
689 if (retval < 0)
690 goto error;
691 }
1da177e4 692 }
d84f4f99 693 if (euid != (uid_t) -1)
a29c33f4 694 new->euid = keuid;
1da177e4 695 if (suid != (uid_t) -1)
a29c33f4 696 new->suid = ksuid;
d84f4f99 697 new->fsuid = new->euid;
1da177e4 698
d84f4f99
DH		 699 retval = security_task_fix_setuid(new, old, LSM_SETID_RES);
700 if (retval < 0)
701 goto error;
1da177e4 702
905ae01c
AG		 703 retval = set_cred_ucounts(new);
704 if (retval < 0)
705 goto error;
706
d84f4f99 707 return commit_creds(new);
1da177e4 708
d84f4f99
DH		 709error:
710 abort_creds(new);
711 return retval;
1da177e4
LT		 712}
713
e530dca5
DB		 714SYSCALL_DEFINE3(setresuid, uid_t, ruid, uid_t, euid, uid_t, suid)
715{
716 return __sys_setresuid(ruid, euid, suid);
717}
718
a29c33f4 719SYSCALL_DEFINE3(getresuid, uid_t __user *, ruidp, uid_t __user *, euidp, uid_t __user *, suidp)
1da177e4 720{
86a264ab 721 const struct cred *cred = current_cred();
1da177e4 722 int retval;
a29c33f4
EB		 723 uid_t ruid, euid, suid;
724
725 ruid = from_kuid_munged(cred->user_ns, cred->uid);
726 euid = from_kuid_munged(cred->user_ns, cred->euid);
727 suid = from_kuid_munged(cred->user_ns, cred->suid);
1da177e4 728
ec94fc3d 729 retval = put_user(ruid, ruidp);
730 if (!retval) {
731 retval = put_user(euid, euidp);
732 if (!retval)
733 return put_user(suid, suidp);
734 }
1da177e4
LT		 735 return retval;
736}
737
738/*
739 * Same as above, but for rgid, egid, sgid.
740 */
e530dca5 741long __sys_setresgid(gid_t rgid, gid_t egid, gid_t sgid)
1da177e4 742{
a29c33f4 743 struct user_namespace *ns = current_user_ns();
d84f4f99
DH		 744 const struct cred *old;
745 struct cred *new;
1da177e4 746 int retval;
a29c33f4
EB		 747 kgid_t krgid, kegid, ksgid;
748
749 krgid = make_kgid(ns, rgid);
750 kegid = make_kgid(ns, egid);
751 ksgid = make_kgid(ns, sgid);
752
753 if ((rgid != (gid_t) -1) && !gid_valid(krgid))
754 return -EINVAL;
755 if ((egid != (gid_t) -1) && !gid_valid(kegid))
756 return -EINVAL;
757 if ((sgid != (gid_t) -1) && !gid_valid(ksgid))
758 return -EINVAL;
1da177e4 759
d84f4f99
DH		 760 new = prepare_creds();
761 if (!new)
762 return -ENOMEM;
763 old = current_cred();
764
d84f4f99 765 retval = -EPERM;
111767c1 766 if (!ns_capable_setid(old->user_ns, CAP_SETGID)) {
a29c33f4
EB		 767 if (rgid != (gid_t) -1 && !gid_eq(krgid, old->gid) &&
768 !gid_eq(krgid, old->egid) && !gid_eq(krgid, old->sgid))
d84f4f99 769 goto error;
a29c33f4
EB		 770 if (egid != (gid_t) -1 && !gid_eq(kegid, old->gid) &&
771 !gid_eq(kegid, old->egid) && !gid_eq(kegid, old->sgid))
d84f4f99 772 goto error;
a29c33f4
EB		 773 if (sgid != (gid_t) -1 && !gid_eq(ksgid, old->gid) &&
774 !gid_eq(ksgid, old->egid) && !gid_eq(ksgid, old->sgid))
d84f4f99 775 goto error;
1da177e4 776 }
d84f4f99 777
1da177e4 778 if (rgid != (gid_t) -1)
a29c33f4 779 new->gid = krgid;
d84f4f99 780 if (egid != (gid_t) -1)
a29c33f4 781 new->egid = kegid;
1da177e4 782 if (sgid != (gid_t) -1)
a29c33f4 783 new->sgid = ksgid;
d84f4f99 784 new->fsgid = new->egid;
1da177e4 785
39030e13
TC		 786 retval = security_task_fix_setgid(new, old, LSM_SETID_RES);
787 if (retval < 0)
788 goto error;
789
d84f4f99
DH		 790 return commit_creds(new);
791
792error:
793 abort_creds(new);
794 return retval;
1da177e4
LT		 795}
796
e530dca5
DB		 797SYSCALL_DEFINE3(setresgid, gid_t, rgid, gid_t, egid, gid_t, sgid)
798{
799 return __sys_setresgid(rgid, egid, sgid);
800}
801
a29c33f4 802SYSCALL_DEFINE3(getresgid, gid_t __user *, rgidp, gid_t __user *, egidp, gid_t __user *, sgidp)
1da177e4 803{
86a264ab 804 const struct cred *cred = current_cred();
1da177e4 805 int retval;
a29c33f4
EB		 806 gid_t rgid, egid, sgid;
807
808 rgid = from_kgid_munged(cred->user_ns, cred->gid);
809 egid = from_kgid_munged(cred->user_ns, cred->egid);
810 sgid = from_kgid_munged(cred->user_ns, cred->sgid);
1da177e4 811
ec94fc3d 812 retval = put_user(rgid, rgidp);
813 if (!retval) {
814 retval = put_user(egid, egidp);
815 if (!retval)
816 retval = put_user(sgid, sgidp);
817 }
1da177e4
LT		 818
819 return retval;
820}
821
822
823/*
824 * "setfsuid()" sets the fsuid - the uid used for filesystem checks. This
825 * is used for "access()" and for the NFS daemon (letting nfsd stay at
826 * whatever uid it wants to). It normally shadows "euid", except when
827 * explicitly set by setfsuid() or for access..
828 */
e530dca5 829long __sys_setfsuid(uid_t uid)
1da177e4 830{
d84f4f99
DH		 831 const struct cred *old;
832 struct cred *new;
833 uid_t old_fsuid;
a29c33f4
EB		 834 kuid_t kuid;
835
836 old = current_cred();
837 old_fsuid = from_kuid_munged(old->user_ns, old->fsuid);
838
839 kuid = make_kuid(old->user_ns, uid);
840 if (!uid_valid(kuid))
841 return old_fsuid;
1da177e4 842
d84f4f99
DH		 843 new = prepare_creds();
844 if (!new)
a29c33f4 845 return old_fsuid;
1da177e4 846
a29c33f4
EB		 847 if (uid_eq(kuid, old->uid) || uid_eq(kuid, old->euid) ||
848 uid_eq(kuid, old->suid) || uid_eq(kuid, old->fsuid) ||
40852275 849 ns_capable_setid(old->user_ns, CAP_SETUID)) {
a29c33f4
EB		 850 if (!uid_eq(kuid, old->fsuid)) {
851 new->fsuid = kuid;
d84f4f99
DH		 852 if (security_task_fix_setuid(new, old, LSM_SETID_FS) == 0)
853 goto change_okay;
1da177e4 854 }
1da177e4
LT		 855 }
856
d84f4f99
DH		 857 abort_creds(new);
858 return old_fsuid;
1da177e4 859
d84f4f99
DH		 860change_okay:
861 commit_creds(new);
1da177e4
LT		 862 return old_fsuid;
863}
864
e530dca5
DB		 865SYSCALL_DEFINE1(setfsuid, uid_t, uid)
866{
867 return __sys_setfsuid(uid);
868}
869
1da177e4 870/*
f42df9e6 871 * Samma på svenska..
1da177e4 872 */
e530dca5 873long __sys_setfsgid(gid_t gid)
1da177e4 874{
d84f4f99
DH		 875 const struct cred *old;
876 struct cred *new;
877 gid_t old_fsgid;
a29c33f4
EB		 878 kgid_t kgid;
879
880 old = current_cred();
881 old_fsgid = from_kgid_munged(old->user_ns, old->fsgid);
882
883 kgid = make_kgid(old->user_ns, gid);
884 if (!gid_valid(kgid))
885 return old_fsgid;
d84f4f99
DH		 886
887 new = prepare_creds();
888 if (!new)
a29c33f4 889 return old_fsgid;
1da177e4 890
a29c33f4
EB		 891 if (gid_eq(kgid, old->gid) || gid_eq(kgid, old->egid) ||
892 gid_eq(kgid, old->sgid) || gid_eq(kgid, old->fsgid) ||
111767c1 893 ns_capable_setid(old->user_ns, CAP_SETGID)) {
a29c33f4
EB		 894 if (!gid_eq(kgid, old->fsgid)) {
895 new->fsgid = kgid;
39030e13
TC		 896 if (security_task_fix_setgid(new,old,LSM_SETID_FS) == 0)
897 goto change_okay;
1da177e4 898 }
1da177e4 899 }
d84f4f99 900
d84f4f99
DH		 901 abort_creds(new);
902 return old_fsgid;
903
904change_okay:
905 commit_creds(new);
1da177e4
LT		 906 return old_fsgid;
907}
e530dca5
DB		 908
909SYSCALL_DEFINE1(setfsgid, gid_t, gid)
910{
911 return __sys_setfsgid(gid);
912}
2813893f 913#endif /* CONFIG_MULTIUSER */
1da177e4 914
4a22f166
SR		 915/**
916 * sys_getpid - return the thread group id of the current process
917 *
918 * Note, despite the name, this returns the tgid not the pid. The tgid and
919 * the pid are identical unless CLONE_THREAD was specified on clone() in
920 * which case the tgid is the same in all threads of the same group.
921 *
922 * This is SMP safe as current->tgid does not change.
923 */
924SYSCALL_DEFINE0(getpid)
925{
926 return task_tgid_vnr(current);
927}
928
929/* Thread ID - the internal kernel "pid" */
930SYSCALL_DEFINE0(gettid)
931{
932 return task_pid_vnr(current);
933}
934
935/*
936 * Accessing ->real_parent is not SMP-safe, it could
937 * change from under us. However, we can use a stale
938 * value of ->real_parent under rcu_read_lock(), see
939 * release_task()->call_rcu(delayed_put_task_struct).
940 */
941SYSCALL_DEFINE0(getppid)
942{
943 int pid;
944
945 rcu_read_lock();
946 pid = task_tgid_vnr(rcu_dereference(current->real_parent));
947 rcu_read_unlock();
948
949 return pid;
950}
951
952SYSCALL_DEFINE0(getuid)
953{
954 /* Only we change this so SMP safe */
955 return from_kuid_munged(current_user_ns(), current_uid());
956}
957
958SYSCALL_DEFINE0(geteuid)
959{
960 /* Only we change this so SMP safe */
961 return from_kuid_munged(current_user_ns(), current_euid());
962}
963
964SYSCALL_DEFINE0(getgid)
965{
966 /* Only we change this so SMP safe */
967 return from_kgid_munged(current_user_ns(), current_gid());
968}
969
970SYSCALL_DEFINE0(getegid)
971{
972 /* Only we change this so SMP safe */
973 return from_kgid_munged(current_user_ns(), current_egid());
974}
975
ca2406ed 976static void do_sys_times(struct tms *tms)
f06febc9 977{
5613fda9 978 u64 tgutime, tgstime, cutime, cstime;
f06febc9 979
e80d0a1a 980 thread_group_cputime_adjusted(current, &tgutime, &tgstime);
f06febc9
FM		 981 cutime = current->signal->cutime;
982 cstime = current->signal->cstime;
5613fda9
FW		 983 tms->tms_utime = nsec_to_clock_t(tgutime);
984 tms->tms_stime = nsec_to_clock_t(tgstime);
985 tms->tms_cutime = nsec_to_clock_t(cutime);
986 tms->tms_cstime = nsec_to_clock_t(cstime);
f06febc9
FM		 987}
988
58fd3aa2 989SYSCALL_DEFINE1(times, struct tms __user *, tbuf)
1da177e4 990{
1da177e4
LT		 991 if (tbuf) {
992 struct tms tmp;
f06febc9
FM		 993
994 do_sys_times(&tmp);
1da177e4
LT		 995 if (copy_to_user(tbuf, &tmp, sizeof(struct tms)))
996 return -EFAULT;
997 }
e3d5a27d 998 force_successful_syscall_return();
1da177e4
LT		 999 return (long) jiffies_64_to_clock_t(get_jiffies_64());
1000}
1001
ca2406ed
AV		 1002#ifdef CONFIG_COMPAT
1003static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
1004{
1005 return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
1006}
1007
1008COMPAT_SYSCALL_DEFINE1(times, struct compat_tms __user *, tbuf)
1009{
1010 if (tbuf) {
1011 struct tms tms;
1012 struct compat_tms tmp;
1013
1014 do_sys_times(&tms);
1015 /* Convert our struct tms to the compat version. */
1016 tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
1017 tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
1018 tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
1019 tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
1020 if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
1021 return -EFAULT;
1022 }
1023 force_successful_syscall_return();
1024 return compat_jiffies_to_clock_t(jiffies);
1025}
1026#endif
1027
1da177e4
LT		 1028/*
1029 * This needs some heavy checking ...
1030 * I just haven't the stomach for it. I also don't fully
1031 * understand sessions/pgrp etc. Let somebody who does explain it.
1032 *
1033 * OK, I think I have the protection semantics right.... this is really
1034 * only important on a multi-user system anyway, to make sure one user
1035 * can't send a signal to a process owned by another. -TYT, 12/12/91
1036 *
98611e4e 1037 * !PF_FORKNOEXEC check to conform completely to POSIX.
1da177e4 1038 */
b290ebe2 1039SYSCALL_DEFINE2(setpgid, pid_t, pid, pid_t, pgid)
1da177e4
LT		 1040{
1041 struct task_struct *p;
ee0acf90 1042 struct task_struct *group_leader = current->group_leader;
4e021306
ON		 1043 struct pid *pgrp;
1044 int err;
1da177e4
LT		 1045
1046 if (!pid)
b488893a 1047 pid = task_pid_vnr(group_leader);
1da177e4
LT		 1048 if (!pgid)
1049 pgid = pid;
1050 if (pgid < 0)
1051 return -EINVAL;
950eaaca 1052 rcu_read_lock();
1da177e4
LT		 1053
1054 /* From this point forward we keep holding onto the tasklist lock
1055 * so that our parent does not change from under us. -DaveM
1056 */
1057 write_lock_irq(&tasklist_lock);
1058
1059 err = -ESRCH;
4e021306 1060 p = find_task_by_vpid(pid);
1da177e4
LT		 1061 if (!p)
1062 goto out;
1063
1064 err = -EINVAL;
1065 if (!thread_group_leader(p))
1066 goto out;
1067
4e021306 1068 if (same_thread_group(p->real_parent, group_leader)) {
1da177e4 1069 err = -EPERM;
41487c65 1070 if (task_session(p) != task_session(group_leader))
1da177e4
LT		 1071 goto out;
1072 err = -EACCES;
98611e4e 1073 if (!(p->flags & PF_FORKNOEXEC))
1da177e4
LT		 1074 goto out;
1075 } else {
1076 err = -ESRCH;
ee0acf90 1077 if (p != group_leader)
1da177e4
LT		 1078 goto out;
1079 }
1080
1081 err = -EPERM;
1082 if (p->signal->leader)
1083 goto out;
1084
4e021306 1085 pgrp = task_pid(p);
1da177e4 1086 if (pgid != pid) {
b488893a 1087 struct task_struct *g;
1da177e4 1088
4e021306
ON		 1089 pgrp = find_vpid(pgid);
1090 g = pid_task(pgrp, PIDTYPE_PGID);
41487c65 1091 if (!g || task_session(g) != task_session(group_leader))
f020bc46 1092 goto out;
1da177e4
LT		 1093 }
1094
1da177e4
LT		 1095 err = security_task_setpgid(p, pgid);
1096 if (err)
1097 goto out;
1098
1b0f7ffd 1099 if (task_pgrp(p) != pgrp)
83beaf3c 1100 change_pid(p, PIDTYPE_PGID, pgrp);
1da177e4
LT		 1101
1102 err = 0;
1103out:
1104 /* All paths lead to here, thus we are safe. -DaveM */
1105 write_unlock_irq(&tasklist_lock);
950eaaca 1106 rcu_read_unlock();
1da177e4
LT		 1107 return err;
1108}
1109
192c5807 1110static int do_getpgid(pid_t pid)
1da177e4 1111{
12a3de0a
ON		 1112 struct task_struct *p;
1113 struct pid *grp;
1114 int retval;
1115
1116 rcu_read_lock();
756184b7 1117 if (!pid)
12a3de0a 1118 grp = task_pgrp(current);
756184b7 1119 else {
1da177e4 1120 retval = -ESRCH;
12a3de0a
ON		 1121 p = find_task_by_vpid(pid);
1122 if (!p)
1123 goto out;
1124 grp = task_pgrp(p);
1125 if (!grp)
1126 goto out;
1127
1128 retval = security_task_getpgid(p);
1129 if (retval)
1130 goto out;
1da177e4 1131 }
12a3de0a
ON		 1132 retval = pid_vnr(grp);
1133out:
1134 rcu_read_unlock();
1135 return retval;
1da177e4
LT		 1136}
1137
192c5807
DB		 1138SYSCALL_DEFINE1(getpgid, pid_t, pid)
1139{
1140 return do_getpgid(pid);
1141}
1142
1da177e4
LT		 1143#ifdef __ARCH_WANT_SYS_GETPGRP
1144
dbf040d9 1145SYSCALL_DEFINE0(getpgrp)
1da177e4 1146{
192c5807 1147 return do_getpgid(0);
1da177e4
LT		 1148}
1149
1150#endif
1151
dbf040d9 1152SYSCALL_DEFINE1(getsid, pid_t, pid)
1da177e4 1153{
1dd768c0
ON		 1154 struct task_struct *p;
1155 struct pid *sid;
1156 int retval;
1157
1158 rcu_read_lock();
756184b7 1159 if (!pid)
1dd768c0 1160 sid = task_session(current);
756184b7 1161 else {
1da177e4 1162 retval = -ESRCH;
1dd768c0
ON		 1163 p = find_task_by_vpid(pid);
1164 if (!p)
1165 goto out;
1166 sid = task_session(p);
1167 if (!sid)
1168 goto out;
1169
1170 retval = security_task_getsid(p);
1171 if (retval)
1172 goto out;
1da177e4 1173 }
1dd768c0
ON		 1174 retval = pid_vnr(sid);
1175out:
1176 rcu_read_unlock();
1177 return retval;
1da177e4
LT		 1178}
1179
81dabb46
ON		 1180static void set_special_pids(struct pid *pid)
1181{
1182 struct task_struct *curr = current->group_leader;
1183
1184 if (task_session(curr) != pid)
1185 change_pid(curr, PIDTYPE_SID, pid);
1186
1187 if (task_pgrp(curr) != pid)
1188 change_pid(curr, PIDTYPE_PGID, pid);
1189}
1190
e2aaa9f4 1191int ksys_setsid(void)
1da177e4 1192{
e19f247a 1193 struct task_struct *group_leader = current->group_leader;
e4cc0a9c
ON		 1194 struct pid *sid = task_pid(group_leader);
1195 pid_t session = pid_vnr(sid);
1da177e4
LT		 1196 int err = -EPERM;
1197
1da177e4 1198 write_lock_irq(&tasklist_lock);
390e2ff0
EB		 1199 /* Fail if I am already a session leader */
1200 if (group_leader->signal->leader)
1201 goto out;
1202
430c6231
ON		 1203 /* Fail if a process group id already exists that equals the
1204 * proposed session id.
390e2ff0 1205 */
6806aac6 1206 if (pid_task(sid, PIDTYPE_PGID))
1da177e4
LT		 1207 goto out;
1208
e19f247a 1209 group_leader->signal->leader = 1;
81dabb46 1210 set_special_pids(sid);
24ec839c 1211
9c9f4ded 1212 proc_clear_tty(group_leader);
24ec839c 1213
e4cc0a9c 1214 err = session;
1da177e4
LT		 1215out:
1216 write_unlock_irq(&tasklist_lock);
5091faa4 1217 if (err > 0) {
0d0df599 1218 proc_sid_connector(group_leader);
5091faa4
MG		 1219 sched_autogroup_create_attach(group_leader);
1220 }
1da177e4
LT		 1221 return err;
1222}
1223
e2aaa9f4
DB		 1224SYSCALL_DEFINE0(setsid)
1225{
1226 return ksys_setsid();
1227}
1228
1da177e4
LT		 1229DECLARE_RWSEM(uts_sem);
1230
c1da50fa
AW		 1231#ifdef COMPAT_UTS_MACHINE
1232static char compat_uts_machine[__OLD_UTS_LEN+1] = COMPAT_UTS_MACHINE;
1233
1234static int __init parse_compat_uts_machine(char *arg)
1235{
1236 strncpy(compat_uts_machine, arg, __OLD_UTS_LEN);
1237 compat_uts_machine[__OLD_UTS_LEN] = 0;
1238 return 0;
1239}
1240early_param("compat_uts_machine", parse_compat_uts_machine);
1241
1242#undef COMPAT_UTS_MACHINE
1243#define COMPAT_UTS_MACHINE compat_uts_machine
1244#endif
1245
e28cbf22
CH		 1246#ifdef COMPAT_UTS_MACHINE
1247#define override_architecture(name) \
46da2766 1248 (personality(current->personality) == PER_LINUX32 && \
e28cbf22
CH		 1249 copy_to_user(name->machine, COMPAT_UTS_MACHINE, \
1250 sizeof(COMPAT_UTS_MACHINE)))
1251#else
1252#define override_architecture(name) 0
1253#endif
1254
be27425d
AK		 1255/*
1256 * Work around broken programs that cannot handle "Linux 3.0".
1257 * Instead we map 3.x to 2.6.40+x, so e.g. 3.0 would be 2.6.40
b7285b42
JN		 1258 * And we map 4.x and later versions to 2.6.60+x, so 4.0/5.0/6.0/... would be
1259 * 2.6.60.
be27425d 1260 */
2702b152 1261static int override_release(char __user *release, size_t len)
be27425d
AK		 1262{
1263 int ret = 0;
be27425d
AK		 1264
1265 if (current->personality & UNAME26) {
2702b152
KC		 1266 const char *rest = UTS_RELEASE;
1267 char buf[65] = { 0 };
be27425d
AK		 1268 int ndots = 0;
1269 unsigned v;
2702b152 1270 size_t copy;
be27425d
AK		 1271
1272 while (*rest) {
1273 if (*rest == '.' && ++ndots >= 3)
1274 break;
1275 if (!isdigit(*rest) && *rest != '.')
1276 break;
1277 rest++;
1278 }
88a68672 1279 v = LINUX_VERSION_PATCHLEVEL + 60;
31fd84b9 1280 copy = clamp_t(size_t, len, 1, sizeof(buf));
2702b152
KC		 1281 copy = scnprintf(buf, copy, "2.6.%u%s", v, rest);
1282 ret = copy_to_user(release, buf, copy + 1);
be27425d
AK		 1283 }
1284 return ret;
1285}
1286
e48fbb69 1287SYSCALL_DEFINE1(newuname, struct new_utsname __user *, name)
1da177e4 1288{
42a0cc34 1289 struct new_utsname tmp;
1da177e4
LT		 1290
1291 down_read(&uts_sem);
42a0cc34 1292 memcpy(&tmp, utsname(), sizeof(tmp));
1da177e4 1293 up_read(&uts_sem);
42a0cc34
JH		 1294 if (copy_to_user(name, &tmp, sizeof(tmp)))
1295 return -EFAULT;
e28cbf22 1296
42a0cc34
JH		 1297 if (override_release(name->release, sizeof(name->release)))
1298 return -EFAULT;
1299 if (override_architecture(name))
1300 return -EFAULT;
1301 return 0;
1da177e4
LT		 1302}
1303
5cacdb4a
CH		 1304#ifdef __ARCH_WANT_SYS_OLD_UNAME
1305/*
1306 * Old cruft
1307 */
1308SYSCALL_DEFINE1(uname, struct old_utsname __user *, name)
1309{
42a0cc34 1310 struct old_utsname tmp;
5cacdb4a
CH		 1311
1312 if (!name)
1313 return -EFAULT;
1314
1315 down_read(&uts_sem);
42a0cc34 1316 memcpy(&tmp, utsname(), sizeof(tmp));
5cacdb4a 1317 up_read(&uts_sem);
42a0cc34
JH		 1318 if (copy_to_user(name, &tmp, sizeof(tmp)))
1319 return -EFAULT;
5cacdb4a 1320
42a0cc34
JH		 1321 if (override_release(name->release, sizeof(name->release)))
1322 return -EFAULT;
1323 if (override_architecture(name))
1324 return -EFAULT;
1325 return 0;
5cacdb4a
CH		 1326}
1327
1328SYSCALL_DEFINE1(olduname, struct oldold_utsname __user *, name)
1329{
5e1aada0 1330 struct oldold_utsname tmp;
5cacdb4a
CH		 1331
1332 if (!name)
1333 return -EFAULT;
5cacdb4a 1334
5e1aada0
JP		 1335 memset(&tmp, 0, sizeof(tmp));
1336
5cacdb4a 1337 down_read(&uts_sem);
42a0cc34
JH		 1338 memcpy(&tmp.sysname, &utsname()->sysname, __OLD_UTS_LEN);
1339 memcpy(&tmp.nodename, &utsname()->nodename, __OLD_UTS_LEN);
1340 memcpy(&tmp.release, &utsname()->release, __OLD_UTS_LEN);
1341 memcpy(&tmp.version, &utsname()->version, __OLD_UTS_LEN);
1342 memcpy(&tmp.machine, &utsname()->machine, __OLD_UTS_LEN);
5cacdb4a 1343 up_read(&uts_sem);
42a0cc34
JH		 1344 if (copy_to_user(name, &tmp, sizeof(tmp)))
1345 return -EFAULT;
5cacdb4a 1346
42a0cc34
JH		 1347 if (override_architecture(name))
1348 return -EFAULT;
1349 if (override_release(name->release, sizeof(name->release)))
1350 return -EFAULT;
1351 return 0;
5cacdb4a
CH		 1352}
1353#endif
1354
5a8a82b1 1355SYSCALL_DEFINE2(sethostname, char __user *, name, int, len)
1da177e4
LT		 1356{
1357 int errno;
1358 char tmp[__NEW_UTS_LEN];
1359
bb96a6f5 1360 if (!ns_capable(current->nsproxy->uts_ns->user_ns, CAP_SYS_ADMIN))
1da177e4 1361 return -EPERM;
fc832ad3 1362
1da177e4
LT		 1363 if (len < 0 || len > __NEW_UTS_LEN)
1364 return -EINVAL;
1da177e4
LT		 1365 errno = -EFAULT;
1366 if (!copy_from_user(tmp, name, len)) {
42a0cc34 1367 struct new_utsname *u;
9679e4dd 1368
42a0cc34
JH		 1369 down_write(&uts_sem);
1370 u = utsname();
9679e4dd
AM		 1371 memcpy(u->nodename, tmp, len);
1372 memset(u->nodename + len, 0, sizeof(u->nodename) - len);
1da177e4 1373 errno = 0;
499eea6b 1374 uts_proc_notify(UTS_PROC_HOSTNAME);
42a0cc34 1375 up_write(&uts_sem);
1da177e4 1376 }
1da177e4
LT		 1377 return errno;
1378}
1379
1380#ifdef __ARCH_WANT_SYS_GETHOSTNAME
1381
5a8a82b1 1382SYSCALL_DEFINE2(gethostname, char __user *, name, int, len)
1da177e4 1383{
42a0cc34 1384 int i;
9679e4dd 1385 struct new_utsname *u;
42a0cc34 1386 char tmp[__NEW_UTS_LEN + 1];
1da177e4
LT		 1387
1388 if (len < 0)
1389 return -EINVAL;
1390 down_read(&uts_sem);
9679e4dd
AM		 1391 u = utsname();
1392 i = 1 + strlen(u->nodename);
1da177e4
LT		 1393 if (i > len)
1394 i = len;
42a0cc34 1395 memcpy(tmp, u->nodename, i);
1da177e4 1396 up_read(&uts_sem);
42a0cc34
JH		 1397 if (copy_to_user(name, tmp, i))
1398 return -EFAULT;
1399 return 0;
1da177e4
LT		 1400}
1401
1402#endif
1403
1404/*
1405 * Only setdomainname; getdomainname can be implemented by calling
1406 * uname()
1407 */
5a8a82b1 1408SYSCALL_DEFINE2(setdomainname, char __user *, name, int, len)
1da177e4
LT		 1409{
1410 int errno;
1411 char tmp[__NEW_UTS_LEN];
1412
fc832ad3 1413 if (!ns_capable(current->nsproxy->uts_ns->user_ns, CAP_SYS_ADMIN))
1da177e4
LT		 1414 return -EPERM;
1415 if (len < 0 || len > __NEW_UTS_LEN)
1416 return -EINVAL;
1417
1da177e4
LT		 1418 errno = -EFAULT;
1419 if (!copy_from_user(tmp, name, len)) {
42a0cc34 1420 struct new_utsname *u;
9679e4dd 1421
42a0cc34
JH		 1422 down_write(&uts_sem);
1423 u = utsname();
9679e4dd
AM		 1424 memcpy(u->domainname, tmp, len);
1425 memset(u->domainname + len, 0, sizeof(u->domainname) - len);
1da177e4 1426 errno = 0;
499eea6b 1427 uts_proc_notify(UTS_PROC_DOMAINNAME);
42a0cc34 1428 up_write(&uts_sem);
1da177e4 1429 }
1da177e4
LT		 1430 return errno;
1431}
1432
e48fbb69 1433SYSCALL_DEFINE2(getrlimit, unsigned int, resource, struct rlimit __user *, rlim)
1da177e4 1434{
b9518345
JS		 1435 struct rlimit value;
1436 int ret;
1437
1438 ret = do_prlimit(current, resource, NULL, &value);
1439 if (!ret)
1440 ret = copy_to_user(rlim, &value, sizeof(*rlim)) ? -EFAULT : 0;
1441
1442 return ret;
1da177e4
LT		 1443}
1444
d9e968cb
AV		 1445#ifdef CONFIG_COMPAT
1446
1447COMPAT_SYSCALL_DEFINE2(setrlimit, unsigned int, resource,
1448 struct compat_rlimit __user *, rlim)
1449{
1450 struct rlimit r;
1451 struct compat_rlimit r32;
1452
1453 if (copy_from_user(&r32, rlim, sizeof(struct compat_rlimit)))
1454 return -EFAULT;
1455
1456 if (r32.rlim_cur == COMPAT_RLIM_INFINITY)
1457 r.rlim_cur = RLIM_INFINITY;
1458 else
1459 r.rlim_cur = r32.rlim_cur;
1460 if (r32.rlim_max == COMPAT_RLIM_INFINITY)
1461 r.rlim_max = RLIM_INFINITY;
1462 else
1463 r.rlim_max = r32.rlim_max;
1464 return do_prlimit(current, resource, &r, NULL);
1465}
1466
1467COMPAT_SYSCALL_DEFINE2(getrlimit, unsigned int, resource,
1468 struct compat_rlimit __user *, rlim)
1469{
1470 struct rlimit r;
1471 int ret;
1472
1473 ret = do_prlimit(current, resource, NULL, &r);
1474 if (!ret) {
58c7ffc0 1475 struct compat_rlimit r32;
d9e968cb
AV		 1476 if (r.rlim_cur > COMPAT_RLIM_INFINITY)
1477 r32.rlim_cur = COMPAT_RLIM_INFINITY;
1478 else
1479 r32.rlim_cur = r.rlim_cur;
1480 if (r.rlim_max > COMPAT_RLIM_INFINITY)
1481 r32.rlim_max = COMPAT_RLIM_INFINITY;
1482 else
1483 r32.rlim_max = r.rlim_max;
1484
1485 if (copy_to_user(rlim, &r32, sizeof(struct compat_rlimit)))
1486 return -EFAULT;
1487 }
1488 return ret;
1489}
1490
1491#endif
1492
1da177e4
LT		 1493#ifdef __ARCH_WANT_SYS_OLD_GETRLIMIT
1494
1495/*
1496 * Back compatibility for getrlimit. Needed for some apps.
1497 */
e48fbb69
HC		 1498SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource,
1499 struct rlimit __user *, rlim)
1da177e4
LT		 1500{
1501 struct rlimit x;
1502 if (resource >= RLIM_NLIMITS)
1503 return -EINVAL;
1504
23d6aef7 1505 resource = array_index_nospec(resource, RLIM_NLIMITS);
1da177e4
LT		 1506 task_lock(current->group_leader);
1507 x = current->signal->rlim[resource];
1508 task_unlock(current->group_leader);
756184b7 1509 if (x.rlim_cur > 0x7FFFFFFF)
1da177e4 1510 x.rlim_cur = 0x7FFFFFFF;
756184b7 1511 if (x.rlim_max > 0x7FFFFFFF)
1da177e4 1512 x.rlim_max = 0x7FFFFFFF;
ec94fc3d 1513 return copy_to_user(rlim, &x, sizeof(x)) ? -EFAULT : 0;
1da177e4
LT		 1514}
1515
613763a1
AV		 1516#ifdef CONFIG_COMPAT
1517COMPAT_SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource,
1518 struct compat_rlimit __user *, rlim)
1519{
1520 struct rlimit r;
1521
1522 if (resource >= RLIM_NLIMITS)
1523 return -EINVAL;
1524
23d6aef7 1525 resource = array_index_nospec(resource, RLIM_NLIMITS);
613763a1
AV		 1526 task_lock(current->group_leader);
1527 r = current->signal->rlim[resource];
1528 task_unlock(current->group_leader);
1529 if (r.rlim_cur > 0x7FFFFFFF)
1530 r.rlim_cur = 0x7FFFFFFF;
1531 if (r.rlim_max > 0x7FFFFFFF)
1532 r.rlim_max = 0x7FFFFFFF;
1533
1534 if (put_user(r.rlim_cur, &rlim->rlim_cur) ||
1535 put_user(r.rlim_max, &rlim->rlim_max))
1536 return -EFAULT;
1537 return 0;
1538}
1539#endif
1540
1da177e4
LT		 1541#endif
1542
c022a0ac
JS		 1543static inline bool rlim64_is_infinity(__u64 rlim64)
1544{
1545#if BITS_PER_LONG < 64
1546 return rlim64 >= ULONG_MAX;
1547#else
1548 return rlim64 == RLIM64_INFINITY;
1549#endif
1550}
1551
1552static void rlim_to_rlim64(const struct rlimit *rlim, struct rlimit64 *rlim64)
1553{
1554 if (rlim->rlim_cur == RLIM_INFINITY)
1555 rlim64->rlim_cur = RLIM64_INFINITY;
1556 else
1557 rlim64->rlim_cur = rlim->rlim_cur;
1558 if (rlim->rlim_max == RLIM_INFINITY)
1559 rlim64->rlim_max = RLIM64_INFINITY;
1560 else
1561 rlim64->rlim_max = rlim->rlim_max;
1562}
1563
1564static void rlim64_to_rlim(const struct rlimit64 *rlim64, struct rlimit *rlim)
1565{
1566 if (rlim64_is_infinity(rlim64->rlim_cur))
1567 rlim->rlim_cur = RLIM_INFINITY;
1568 else
1569 rlim->rlim_cur = (unsigned long)rlim64->rlim_cur;
1570 if (rlim64_is_infinity(rlim64->rlim_max))
1571 rlim->rlim_max = RLIM_INFINITY;
1572 else
1573 rlim->rlim_max = (unsigned long)rlim64->rlim_max;
1574}
1575
1c1e618d 1576/* make sure you are allowed to change @tsk limits before calling this */
5b41535a
JS		 1577int do_prlimit(struct task_struct *tsk, unsigned int resource,
1578 struct rlimit *new_rlim, struct rlimit *old_rlim)
1da177e4 1579{
5b41535a 1580 struct rlimit *rlim;
86f162f4 1581 int retval = 0;
1da177e4
LT		 1582
1583 if (resource >= RLIM_NLIMITS)
1584 return -EINVAL;
5b41535a
JS		 1585 if (new_rlim) {
1586 if (new_rlim->rlim_cur > new_rlim->rlim_max)
1587 return -EINVAL;
1588 if (resource == RLIMIT_NOFILE &&
1589 new_rlim->rlim_max > sysctl_nr_open)
1590 return -EPERM;
1591 }
1da177e4 1592
1c1e618d
JS		 1593 /* protect tsk->signal and tsk->sighand from disappearing */
1594 read_lock(&tasklist_lock);
1595 if (!tsk->sighand) {
1596 retval = -ESRCH;
1597 goto out;
1598 }
1599
5b41535a 1600 rlim = tsk->signal->rlim + resource;
86f162f4 1601 task_lock(tsk->group_leader);
5b41535a 1602 if (new_rlim) {
fc832ad3
SH		 1603 /* Keep the capable check against init_user_ns until
1604 cgroups can contain all limits */
5b41535a
JS		 1605 if (new_rlim->rlim_max > rlim->rlim_max &&
1606 !capable(CAP_SYS_RESOURCE))
1607 retval = -EPERM;
1608 if (!retval)
cad4ea54 1609 retval = security_task_setrlimit(tsk, resource, new_rlim);
5b41535a
JS		 1610 }
1611 if (!retval) {
1612 if (old_rlim)
1613 *old_rlim = *rlim;
1614 if (new_rlim)
1615 *rlim = *new_rlim;
9926e4c7 1616 }
7855c35d 1617 task_unlock(tsk->group_leader);
1da177e4 1618
d3561f78 1619 /*
24db4dd9 1620 * RLIMIT_CPU handling. Arm the posix CPU timer if the limit is not
5afe69c2 1621 * infinite. In case of RLIM_INFINITY the posix CPU timer code
24db4dd9 1622 * ignores the rlimit.
d3561f78 1623 */
5b41535a 1624 if (!retval && new_rlim && resource == RLIMIT_CPU &&
baa73d9e
NP		 1625 new_rlim->rlim_cur != RLIM_INFINITY &&
1626 IS_ENABLED(CONFIG_POSIX_TIMERS))
5b41535a 1627 update_rlimit_cpu(tsk, new_rlim->rlim_cur);
ec9e16ba 1628out:
1c1e618d 1629 read_unlock(&tasklist_lock);
2fb9d268 1630 return retval;
1da177e4
LT		 1631}
1632
c022a0ac 1633/* rcu lock must be held */
791ec491
SS		 1634static int check_prlimit_permission(struct task_struct *task,
1635 unsigned int flags)
c022a0ac
JS		 1636{
1637 const struct cred *cred = current_cred(), *tcred;
791ec491 1638 bool id_match;
c022a0ac 1639
fc832ad3
SH		 1640 if (current == task)
1641 return 0;
c022a0ac 1642
fc832ad3 1643 tcred = __task_cred(task);
791ec491
SS		 1644 id_match = (uid_eq(cred->uid, tcred->euid) &&
1645 uid_eq(cred->uid, tcred->suid) &&
1646 uid_eq(cred->uid, tcred->uid) &&
1647 gid_eq(cred->gid, tcred->egid) &&
1648 gid_eq(cred->gid, tcred->sgid) &&
1649 gid_eq(cred->gid, tcred->gid));
1650 if (!id_match && !ns_capable(tcred->user_ns, CAP_SYS_RESOURCE))
1651 return -EPERM;
fc832ad3 1652
791ec491 1653 return security_task_prlimit(cred, tcred, flags);
c022a0ac
JS		 1654}
1655
1656SYSCALL_DEFINE4(prlimit64, pid_t, pid, unsigned int, resource,
1657 const struct rlimit64 __user *, new_rlim,
1658 struct rlimit64 __user *, old_rlim)
1659{
1660 struct rlimit64 old64, new64;
1661 struct rlimit old, new;
1662 struct task_struct *tsk;
791ec491 1663 unsigned int checkflags = 0;
c022a0ac
JS		 1664 int ret;
1665
791ec491
SS		 1666 if (old_rlim)
1667 checkflags |= LSM_PRLIMIT_READ;
1668
c022a0ac
JS		 1669 if (new_rlim) {
1670 if (copy_from_user(&new64, new_rlim, sizeof(new64)))
1671 return -EFAULT;
1672 rlim64_to_rlim(&new64, &new);
791ec491 1673 checkflags |= LSM_PRLIMIT_WRITE;
c022a0ac
JS		 1674 }
1675
1676 rcu_read_lock();
1677 tsk = pid ? find_task_by_vpid(pid) : current;
1678 if (!tsk) {
1679 rcu_read_unlock();
1680 return -ESRCH;
1681 }
791ec491 1682 ret = check_prlimit_permission(tsk, checkflags);
c022a0ac
JS		 1683 if (ret) {
1684 rcu_read_unlock();
1685 return ret;
1686 }
1687 get_task_struct(tsk);
1688 rcu_read_unlock();
1689
1690 ret = do_prlimit(tsk, resource, new_rlim ? &new : NULL,
1691 old_rlim ? &old : NULL);
1692
1693 if (!ret && old_rlim) {
1694 rlim_to_rlim64(&old, &old64);
1695 if (copy_to_user(old_rlim, &old64, sizeof(old64)))
1696 ret = -EFAULT;
1697 }
1698
1699 put_task_struct(tsk);
1700 return ret;
1701}
1702
7855c35d
JS		 1703SYSCALL_DEFINE2(setrlimit, unsigned int, resource, struct rlimit __user *, rlim)
1704{
1705 struct rlimit new_rlim;
1706
1707 if (copy_from_user(&new_rlim, rlim, sizeof(*rlim)))
1708 return -EFAULT;
5b41535a 1709 return do_prlimit(current, resource, &new_rlim, NULL);
7855c35d
JS		 1710}
1711
1da177e4
LT		 1712/*
1713 * It would make sense to put struct rusage in the task_struct,
1714 * except that would make the task_struct be *really big*. After
1715 * task_struct gets moved into malloc'ed memory, it would
1716 * make sense to do this. It will make moving the rest of the information
1717 * a lot simpler! (Which we're not doing right now because we're not
1718 * measuring them yet).
1719 *
1da177e4
LT		 1720 * When sampling multiple threads for RUSAGE_SELF, under SMP we might have
1721 * races with threads incrementing their own counters. But since word
1722 * reads are atomic, we either get new values or old values and we don't
1723 * care which for the sums. We always take the siglock to protect reading
1724 * the c* fields from p->signal from races with exit.c updating those
1725 * fields when reaping, so a sample either gets all the additions of a
1726 * given child after it's reaped, or none so this sample is before reaping.
2dd0ebcd 1727 *
de047c1b
RT		 1728 * Locking:
1729 * We need to take the siglock for CHILDEREN, SELF and BOTH
1730 * for the cases current multithreaded, non-current single threaded
1731 * non-current multithreaded. Thread traversal is now safe with
1732 * the siglock held.
1733 * Strictly speaking, we donot need to take the siglock if we are current and
1734 * single threaded, as no one else can take our signal_struct away, no one
1735 * else can reap the children to update signal->c* counters, and no one else
1736 * can race with the signal-> fields. If we do not take any lock, the
1737 * signal-> fields could be read out of order while another thread was just
1738 * exiting. So we should place a read memory barrier when we avoid the lock.
1739 * On the writer side, write memory barrier is implied in __exit_signal
1740 * as __exit_signal releases the siglock spinlock after updating the signal->
1741 * fields. But we don't do this yet to keep things simple.
2dd0ebcd 1742 *
1da177e4
LT		 1743 */
1744
f06febc9 1745static void accumulate_thread_rusage(struct task_struct *t, struct rusage *r)
679c9cd4 1746{
679c9cd4
SK		 1747 r->ru_nvcsw += t->nvcsw;
1748 r->ru_nivcsw += t->nivcsw;
1749 r->ru_minflt += t->min_flt;
1750 r->ru_majflt += t->maj_flt;
1751 r->ru_inblock += task_io_get_inblock(t);
1752 r->ru_oublock += task_io_get_oublock(t);
1753}
1754
ce72a16f 1755void getrusage(struct task_struct *p, int who, struct rusage *r)
1da177e4
LT		 1756{
1757 struct task_struct *t;
1758 unsigned long flags;
5613fda9 1759 u64 tgutime, tgstime, utime, stime;
1f10206c 1760 unsigned long maxrss = 0;
1da177e4 1761
ec94fc3d 1762 memset((char *)r, 0, sizeof (*r));
64861634 1763 utime = stime = 0;
1da177e4 1764
679c9cd4 1765 if (who == RUSAGE_THREAD) {
e80d0a1a 1766 task_cputime_adjusted(current, &utime, &stime);
f06febc9 1767 accumulate_thread_rusage(p, r);
1f10206c 1768 maxrss = p->signal->maxrss;
679c9cd4
SK		 1769 goto out;
1770 }
1771
d6cf723a 1772 if (!lock_task_sighand(p, &flags))
de047c1b 1773 return;
0f59cc4a 1774
1da177e4 1775 switch (who) {
ec94fc3d 1776 case RUSAGE_BOTH:
1777 case RUSAGE_CHILDREN:
1778 utime = p->signal->cutime;
1779 stime = p->signal->cstime;
1780 r->ru_nvcsw = p->signal->cnvcsw;
1781 r->ru_nivcsw = p->signal->cnivcsw;
1782 r->ru_minflt = p->signal->cmin_flt;
1783 r->ru_majflt = p->signal->cmaj_flt;
1784 r->ru_inblock = p->signal->cinblock;
1785 r->ru_oublock = p->signal->coublock;
1786 maxrss = p->signal->cmaxrss;
1787
1788 if (who == RUSAGE_CHILDREN)
1da177e4 1789 break;
df561f66 1790 fallthrough;
0f59cc4a 1791
ec94fc3d 1792 case RUSAGE_SELF:
1793 thread_group_cputime_adjusted(p, &tgutime, &tgstime);
1794 utime += tgutime;
1795 stime += tgstime;
1796 r->ru_nvcsw += p->signal->nvcsw;
1797 r->ru_nivcsw += p->signal->nivcsw;
1798 r->ru_minflt += p->signal->min_flt;
1799 r->ru_majflt += p->signal->maj_flt;
1800 r->ru_inblock += p->signal->inblock;
1801 r->ru_oublock += p->signal->oublock;
1802 if (maxrss < p->signal->maxrss)
1803 maxrss = p->signal->maxrss;
1804 t = p;
1805 do {
1806 accumulate_thread_rusage(t, r);
1807 } while_each_thread(p, t);
1808 break;
1809
1810 default:
1811 BUG();
1da177e4 1812 }
de047c1b 1813 unlock_task_sighand(p, &flags);
de047c1b 1814
679c9cd4 1815out:
bdd565f8
AB		 1816 r->ru_utime = ns_to_kernel_old_timeval(utime);
1817 r->ru_stime = ns_to_kernel_old_timeval(stime);
1f10206c
JP		 1818
1819 if (who != RUSAGE_CHILDREN) {
1820 struct mm_struct *mm = get_task_mm(p);
ec94fc3d 1821
1f10206c
JP		 1822 if (mm) {
1823 setmax_mm_hiwater_rss(&maxrss, mm);
1824 mmput(mm);
1825 }
1826 }
1827 r->ru_maxrss = maxrss * (PAGE_SIZE / 1024); /* convert pages to KBs */
1da177e4
LT		 1828}
1829
ce72a16f 1830SYSCALL_DEFINE2(getrusage, int, who, struct rusage __user *, ru)
1da177e4
LT		 1831{
1832 struct rusage r;
ec94fc3d 1833
679c9cd4
SK		 1834 if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN &&
1835 who != RUSAGE_THREAD)
1da177e4 1836 return -EINVAL;
ce72a16f
AV		 1837
1838 getrusage(current, who, &r);
1839 return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0;
1da177e4
LT		 1840}
1841
8d2d5c4a
AV		 1842#ifdef CONFIG_COMPAT
1843COMPAT_SYSCALL_DEFINE2(getrusage, int, who, struct compat_rusage __user *, ru)
1844{
1845 struct rusage r;
1846
1847 if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN &&
1848 who != RUSAGE_THREAD)
1849 return -EINVAL;
1850
ce72a16f 1851 getrusage(current, who, &r);
8d2d5c4a
AV		 1852 return put_compat_rusage(&r, ru);
1853}
1854#endif
1855
e48fbb69 1856SYSCALL_DEFINE1(umask, int, mask)
1da177e4
LT		 1857{
1858 mask = xchg(&current->fs->umask, mask & S_IRWXUGO);
1859 return mask;
1860}
3b7391de 1861
6e399cd1 1862static int prctl_set_mm_exe_file(struct mm_struct *mm, unsigned int fd)
b32dfe37 1863{
2903ff01 1864 struct fd exe;
496ad9aa 1865 struct inode *inode;
2903ff01 1866 int err;
b32dfe37 1867
2903ff01
AV		 1868 exe = fdget(fd);
1869 if (!exe.file)
b32dfe37
CG		 1870 return -EBADF;
1871
496ad9aa 1872 inode = file_inode(exe.file);
b32dfe37
CG		 1873
1874 /*
1875 * Because the original mm->exe_file points to executable file, make
1876 * sure that this one is executable as well, to avoid breaking an
1877 * overall picture.
1878 */
1879 err = -EACCES;
90f8572b 1880 if (!S_ISREG(inode->i_mode) || path_noexec(&exe.file->f_path))
b32dfe37
CG		 1881 goto exit;
1882
02f92b38 1883 err = file_permission(exe.file, MAY_EXEC);
b32dfe37
CG		 1884 if (err)
1885 goto exit;
1886
35d7bdc8 1887 err = replace_mm_exe_file(mm, exe.file);
b32dfe37 1888exit:
2903ff01 1889 fdput(exe);
b32dfe37
CG		 1890 return err;
1891}
1892
f606b77f 1893/*
11bbd8b4
MK		 1894 * Check arithmetic relations of passed addresses.
1895 *
f606b77f
CG		 1896 * WARNING: we don't require any capability here so be very careful
1897 * in what is allowed for modification from userspace.
1898 */
11bbd8b4 1899static int validate_prctl_map_addr(struct prctl_mm_map *prctl_map)
f606b77f
CG		 1900{
1901 unsigned long mmap_max_addr = TASK_SIZE;
f606b77f
CG		 1902 int error = -EINVAL, i;
1903
1904 static const unsigned char offsets[] = {
1905 offsetof(struct prctl_mm_map, start_code),
1906 offsetof(struct prctl_mm_map, end_code),
1907 offsetof(struct prctl_mm_map, start_data),
1908 offsetof(struct prctl_mm_map, end_data),
1909 offsetof(struct prctl_mm_map, start_brk),
1910 offsetof(struct prctl_mm_map, brk),
1911 offsetof(struct prctl_mm_map, start_stack),
1912 offsetof(struct prctl_mm_map, arg_start),
1913 offsetof(struct prctl_mm_map, arg_end),
1914 offsetof(struct prctl_mm_map, env_start),
1915 offsetof(struct prctl_mm_map, env_end),
1916 };
1917
1918 /*
1919 * Make sure the members are not somewhere outside
1920 * of allowed address space.
1921 */
1922 for (i = 0; i < ARRAY_SIZE(offsets); i++) {
1923 u64 val = *(u64 *)((char *)prctl_map + offsets[i]);
1924
1925 if ((unsigned long)val >= mmap_max_addr ||
1926 (unsigned long)val < mmap_min_addr)
1927 goto out;
1928 }
1929
1930 /*
1931 * Make sure the pairs are ordered.
1932 */
1933#define __prctl_check_order(__m1, __op, __m2) \
1934 ((unsigned long)prctl_map->__m1 __op \
1935 (unsigned long)prctl_map->__m2) ? 0 : -EINVAL
1936 error = __prctl_check_order(start_code, <, end_code);
a9e73998 1937 error |= __prctl_check_order(start_data,<=, end_data);
f606b77f
CG		 1938 error |= __prctl_check_order(start_brk, <=, brk);
1939 error |= __prctl_check_order(arg_start, <=, arg_end);
1940 error |= __prctl_check_order(env_start, <=, env_end);
1941 if (error)
1942 goto out;
1943#undef __prctl_check_order
1944
1945 error = -EINVAL;
1946
f606b77f
CG		 1947 /*
1948 * Neither we should allow to override limits if they set.
1949 */
1950 if (check_data_rlimit(rlimit(RLIMIT_DATA), prctl_map->brk,
1951 prctl_map->start_brk, prctl_map->end_data,
1952 prctl_map->start_data))
1953 goto out;
1954
f606b77f
CG		 1955 error = 0;
1956out:
1957 return error;
1958}
1959
4a00e9df 1960#ifdef CONFIG_CHECKPOINT_RESTORE
f606b77f
CG		 1961static int prctl_set_mm_map(int opt, const void __user *addr, unsigned long data_size)
1962{
1963 struct prctl_mm_map prctl_map = { .exe_fd = (u32)-1, };
1964 unsigned long user_auxv[AT_VECTOR_SIZE];
1965 struct mm_struct *mm = current->mm;
1966 int error;
1967
1968 BUILD_BUG_ON(sizeof(user_auxv) != sizeof(mm->saved_auxv));
1969 BUILD_BUG_ON(sizeof(struct prctl_mm_map) > 256);
1970
1971 if (opt == PR_SET_MM_MAP_SIZE)
1972 return put_user((unsigned int)sizeof(prctl_map),
1973 (unsigned int __user *)addr);
1974
1975 if (data_size != sizeof(prctl_map))
1976 return -EINVAL;
1977
1978 if (copy_from_user(&prctl_map, addr, sizeof(prctl_map)))
1979 return -EFAULT;
1980
11bbd8b4 1981 error = validate_prctl_map_addr(&prctl_map);
f606b77f
CG		 1982 if (error)
1983 return error;
1984
1985 if (prctl_map.auxv_size) {
11bbd8b4
MK		 1986 /*
1987 * Someone is trying to cheat the auxv vector.
1988 */
1989 if (!prctl_map.auxv ||
1990 prctl_map.auxv_size > sizeof(mm->saved_auxv))
1991 return -EINVAL;
1992
f606b77f
CG		 1993 memset(user_auxv, 0, sizeof(user_auxv));
1994 if (copy_from_user(user_auxv,
1995 (const void __user *)prctl_map.auxv,
1996 prctl_map.auxv_size))
1997 return -EFAULT;
1998
1999 /* Last entry must be AT_NULL as specification requires */
2000 user_auxv[AT_VECTOR_SIZE - 2] = AT_NULL;
2001 user_auxv[AT_VECTOR_SIZE - 1] = AT_NULL;
2002 }
2003
ddf1d398 2004 if (prctl_map.exe_fd != (u32)-1) {
11bbd8b4 2005 /*
ebd6de68
NV		 2006 * Check if the current user is checkpoint/restore capable.
2007 * At the time of this writing, it checks for CAP_SYS_ADMIN
2008 * or CAP_CHECKPOINT_RESTORE.
2009 * Note that a user with access to ptrace can masquerade an
2010 * arbitrary program as any executable, even setuid ones.
2011 * This may have implications in the tomoyo subsystem.
11bbd8b4 2012 */
ebd6de68 2013 if (!checkpoint_restore_ns_capable(current_user_ns()))
227175b2 2014 return -EPERM;
11bbd8b4 2015
6e399cd1 2016 error = prctl_set_mm_exe_file(mm, prctl_map.exe_fd);
ddf1d398
MG		 2017 if (error)
2018 return error;
2019 }
2020
88aa7cc6 2021 /*
5afe69c2 2022 * arg_lock protects concurrent updates but we still need mmap_lock for
88aa7cc6
YS		 2023 * read to exclude races with sys_brk.
2024 */
d8ed45c5 2025 mmap_read_lock(mm);
f606b77f
CG		 2026
2027 /*
2028 * We don't validate if these members are pointing to
2029 * real present VMAs because application may have correspond
2030 * VMAs already unmapped and kernel uses these members for statistics
2031 * output in procfs mostly, except
2032 *
15ec0fcf 2033 * - @start_brk/@brk which are used in do_brk_flags but kernel lookups
5afe69c2 2034 * for VMAs when updating these members so anything wrong written
f606b77f
CG		 2035 * here cause kernel to swear at userspace program but won't lead
2036 * to any problem in kernel itself
2037 */
2038
88aa7cc6 2039 spin_lock(&mm->arg_lock);
f606b77f
CG		 2040 mm->start_code = prctl_map.start_code;
2041 mm->end_code = prctl_map.end_code;
2042 mm->start_data = prctl_map.start_data;
2043 mm->end_data = prctl_map.end_data;
2044 mm->start_brk = prctl_map.start_brk;
2045 mm->brk = prctl_map.brk;
2046 mm->start_stack = prctl_map.start_stack;
2047 mm->arg_start = prctl_map.arg_start;
2048 mm->arg_end = prctl_map.arg_end;
2049 mm->env_start = prctl_map.env_start;
2050 mm->env_end = prctl_map.env_end;
88aa7cc6 2051 spin_unlock(&mm->arg_lock);
f606b77f
CG		 2052
2053 /*
2054 * Note this update of @saved_auxv is lockless thus
2055 * if someone reads this member in procfs while we're
2056 * updating -- it may get partly updated results. It's
2057 * known and acceptable trade off: we leave it as is to
2058 * not introduce additional locks here making the kernel
2059 * more complex.
2060 */
2061 if (prctl_map.auxv_size)
2062 memcpy(mm->saved_auxv, user_auxv, sizeof(user_auxv));
2063
d8ed45c5 2064 mmap_read_unlock(mm);
ddf1d398 2065 return 0;
f606b77f
CG		 2066}
2067#endif /* CONFIG_CHECKPOINT_RESTORE */
2068
4a00e9df
AD		 2069static int prctl_set_auxv(struct mm_struct *mm, unsigned long addr,
2070 unsigned long len)
2071{
2072 /*
2073 * This doesn't move the auxiliary vector itself since it's pinned to
2074 * mm_struct, but it permits filling the vector with new values. It's
2075 * up to the caller to provide sane values here, otherwise userspace
2076 * tools which use this vector might be unhappy.
2077 */
c995f12a 2078 unsigned long user_auxv[AT_VECTOR_SIZE] = {};
4a00e9df
AD		 2079
2080 if (len > sizeof(user_auxv))
2081 return -EINVAL;
2082
2083 if (copy_from_user(user_auxv, (const void __user *)addr, len))
2084 return -EFAULT;
2085
2086 /* Make sure the last entry is always AT_NULL */
2087 user_auxv[AT_VECTOR_SIZE - 2] = 0;
2088 user_auxv[AT_VECTOR_SIZE - 1] = 0;
2089
2090 BUILD_BUG_ON(sizeof(user_auxv) != sizeof(mm->saved_auxv));
2091
2092 task_lock(current);
2093 memcpy(mm->saved_auxv, user_auxv, len);
2094 task_unlock(current);
2095
2096 return 0;
2097}
2098
028ee4be
CG		 2099static int prctl_set_mm(int opt, unsigned long addr,
2100 unsigned long arg4, unsigned long arg5)
2101{
028ee4be 2102 struct mm_struct *mm = current->mm;
11bbd8b4
MK		 2103 struct prctl_mm_map prctl_map = {
2104 .auxv = NULL,
2105 .auxv_size = 0,
2106 .exe_fd = -1,
2107 };
fe8c7f5c
CG		 2108 struct vm_area_struct *vma;
2109 int error;
028ee4be 2110
f606b77f
CG		 2111 if (arg5 || (arg4 && (opt != PR_SET_MM_AUXV &&
2112 opt != PR_SET_MM_MAP &&
2113 opt != PR_SET_MM_MAP_SIZE)))
028ee4be
CG		 2114 return -EINVAL;
2115
f606b77f
CG		 2116#ifdef CONFIG_CHECKPOINT_RESTORE
2117 if (opt == PR_SET_MM_MAP || opt == PR_SET_MM_MAP_SIZE)
2118 return prctl_set_mm_map(opt, (const void __user *)addr, arg4);
2119#endif
2120
79f0713d 2121 if (!capable(CAP_SYS_RESOURCE))
028ee4be
CG		 2122 return -EPERM;
2123
6e399cd1
DB		 2124 if (opt == PR_SET_MM_EXE_FILE)
2125 return prctl_set_mm_exe_file(mm, (unsigned int)addr);
b32dfe37 2126
4a00e9df
AD		 2127 if (opt == PR_SET_MM_AUXV)
2128 return prctl_set_auxv(mm, addr, arg4);
2129
1ad75b9e 2130 if (addr >= TASK_SIZE || addr < mmap_min_addr)
028ee4be
CG		 2131 return -EINVAL;
2132
fe8c7f5c
CG		 2133 error = -EINVAL;
2134
bc81426f 2135 /*
5afe69c2 2136 * arg_lock protects concurrent updates of arg boundaries, we need
c1e8d7c6 2137 * mmap_lock for a) concurrent sys_brk, b) finding VMA for addr
bc81426f
MK		 2138 * validation.
2139 */
d8ed45c5 2140 mmap_read_lock(mm);
028ee4be
CG		 2141 vma = find_vma(mm, addr);
2142
bc81426f 2143 spin_lock(&mm->arg_lock);
4a00e9df
AD		 2144 prctl_map.start_code = mm->start_code;
2145 prctl_map.end_code = mm->end_code;
2146 prctl_map.start_data = mm->start_data;
2147 prctl_map.end_data = mm->end_data;
2148 prctl_map.start_brk = mm->start_brk;
2149 prctl_map.brk = mm->brk;
2150 prctl_map.start_stack = mm->start_stack;
2151 prctl_map.arg_start = mm->arg_start;
2152 prctl_map.arg_end = mm->arg_end;
2153 prctl_map.env_start = mm->env_start;
2154 prctl_map.env_end = mm->env_end;
4a00e9df 2155
028ee4be
CG		 2156 switch (opt) {
2157 case PR_SET_MM_START_CODE:
4a00e9df 2158 prctl_map.start_code = addr;
fe8c7f5c 2159 break;
028ee4be 2160 case PR_SET_MM_END_CODE:
4a00e9df 2161 prctl_map.end_code = addr;
028ee4be 2162 break;
028ee4be 2163 case PR_SET_MM_START_DATA:
4a00e9df 2164 prctl_map.start_data = addr;
028ee4be 2165 break;
fe8c7f5c 2166 case PR_SET_MM_END_DATA:
4a00e9df
AD		 2167 prctl_map.end_data = addr;
2168 break;
2169 case PR_SET_MM_START_STACK:
2170 prctl_map.start_stack = addr;
028ee4be 2171 break;
028ee4be 2172 case PR_SET_MM_START_BRK:
4a00e9df 2173 prctl_map.start_brk = addr;
028ee4be 2174 break;
028ee4be 2175 case PR_SET_MM_BRK:
4a00e9df 2176 prctl_map.brk = addr;
028ee4be 2177 break;
4a00e9df
AD		 2178 case PR_SET_MM_ARG_START:
2179 prctl_map.arg_start = addr;
2180 break;
2181 case PR_SET_MM_ARG_END:
2182 prctl_map.arg_end = addr;
2183 break;
2184 case PR_SET_MM_ENV_START:
2185 prctl_map.env_start = addr;
2186 break;
2187 case PR_SET_MM_ENV_END:
2188 prctl_map.env_end = addr;
2189 break;
2190 default:
2191 goto out;
2192 }
2193
11bbd8b4 2194 error = validate_prctl_map_addr(&prctl_map);
4a00e9df
AD		 2195 if (error)
2196 goto out;
028ee4be 2197
4a00e9df 2198 switch (opt) {
fe8c7f5c
CG		 2199 /*
2200 * If command line arguments and environment
2201 * are placed somewhere else on stack, we can
2202 * set them up here, ARG_START/END to setup
5afe69c2 2203 * command line arguments and ENV_START/END
fe8c7f5c
CG		 2204 * for environment.
2205 */
2206 case PR_SET_MM_START_STACK:
2207 case PR_SET_MM_ARG_START:
2208 case PR_SET_MM_ARG_END:
2209 case PR_SET_MM_ENV_START:
2210 case PR_SET_MM_ENV_END:
2211 if (!vma) {
2212 error = -EFAULT;
2213 goto out;
2214 }
028ee4be
CG		 2215 }
2216
4a00e9df
AD		 2217 mm->start_code = prctl_map.start_code;
2218 mm->end_code = prctl_map.end_code;
2219 mm->start_data = prctl_map.start_data;
2220 mm->end_data = prctl_map.end_data;
2221 mm->start_brk = prctl_map.start_brk;
2222 mm->brk = prctl_map.brk;
2223 mm->start_stack = prctl_map.start_stack;
2224 mm->arg_start = prctl_map.arg_start;
2225 mm->arg_end = prctl_map.arg_end;
2226 mm->env_start = prctl_map.env_start;
2227 mm->env_end = prctl_map.env_end;
2228
028ee4be 2229 error = 0;
028ee4be 2230out:
bc81426f 2231 spin_unlock(&mm->arg_lock);
d8ed45c5 2232 mmap_read_unlock(mm);
028ee4be
CG		 2233 return error;
2234}
300f786b 2235
52b36941 2236#ifdef CONFIG_CHECKPOINT_RESTORE
986b9eac 2237static int prctl_get_tid_address(struct task_struct *me, int __user * __user *tid_addr)
300f786b
CG		 2238{
2239 return put_user(me->clear_child_tid, tid_addr);
2240}
52b36941 2241#else
986b9eac 2242static int prctl_get_tid_address(struct task_struct *me, int __user * __user *tid_addr)
300f786b
CG		 2243{
2244 return -EINVAL;
2245}
028ee4be
CG		 2246#endif
2247
749860ce
PT		 2248static int propagate_has_child_subreaper(struct task_struct *p, void *data)
2249{
2250 /*
5afe69c2
XC		 2251 * If task has has_child_subreaper - all its descendants
2252 * already have these flag too and new descendants will
749860ce
PT		 2253 * inherit it on fork, skip them.
2254 *
2255 * If we've found child_reaper - skip descendants in
2256 * it's subtree as they will never get out pidns.
2257 */
2258 if (p->signal->has_child_subreaper ||
2259 is_child_reaper(task_pid(p)))
2260 return 0;
2261
2262 p->signal->has_child_subreaper = 1;
2263 return 1;
2264}
2265
7bbf1373 2266int __weak arch_prctl_spec_ctrl_get(struct task_struct *t, unsigned long which)
b617cfc8
TG		 2267{
2268 return -EINVAL;
2269}
2270
7bbf1373
KC		 2271int __weak arch_prctl_spec_ctrl_set(struct task_struct *t, unsigned long which,
2272 unsigned long ctrl)
b617cfc8
TG		 2273{
2274 return -EINVAL;
2275}
2276
a37b0715 2277#define PR_IO_FLUSHER (PF_MEMALLOC_NOIO | PF_LOCAL_THROTTLE)
8d19f1c8 2278
c4ea37c2
HC		 2279SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
2280 unsigned long, arg4, unsigned long, arg5)
1da177e4 2281{
b6dff3ec
DH		 2282 struct task_struct *me = current;
2283 unsigned char comm[sizeof(me->comm)];
2284 long error;
1da177e4 2285
d84f4f99
DH		 2286 error = security_task_prctl(option, arg2, arg3, arg4, arg5);
2287 if (error != -ENOSYS)
1da177e4
LT		 2288 return error;
2289
d84f4f99 2290 error = 0;
1da177e4 2291 switch (option) {
f3cbd435
AM		 2292 case PR_SET_PDEATHSIG:
2293 if (!valid_signal(arg2)) {
2294 error = -EINVAL;
1da177e4 2295 break;
f3cbd435
AM		 2296 }
2297 me->pdeath_signal = arg2;
2298 break;
2299 case PR_GET_PDEATHSIG:
2300 error = put_user(me->pdeath_signal, (int __user *)arg2);
2301 break;
2302 case PR_GET_DUMPABLE:
2303 error = get_dumpable(me->mm);
2304 break;
2305 case PR_SET_DUMPABLE:
2306 if (arg2 != SUID_DUMP_DISABLE && arg2 != SUID_DUMP_USER) {
2307 error = -EINVAL;
1da177e4 2308 break;
f3cbd435
AM		 2309 }
2310 set_dumpable(me->mm, arg2);
2311 break;
1da177e4 2312
f3cbd435
AM		 2313 case PR_SET_UNALIGN:
2314 error = SET_UNALIGN_CTL(me, arg2);
2315 break;
2316 case PR_GET_UNALIGN:
2317 error = GET_UNALIGN_CTL(me, arg2);
2318 break;
2319 case PR_SET_FPEMU:
2320 error = SET_FPEMU_CTL(me, arg2);
2321 break;
2322 case PR_GET_FPEMU:
2323 error = GET_FPEMU_CTL(me, arg2);
2324 break;
2325 case PR_SET_FPEXC:
2326 error = SET_FPEXC_CTL(me, arg2);
2327 break;
2328 case PR_GET_FPEXC:
2329 error = GET_FPEXC_CTL(me, arg2);
2330 break;
2331 case PR_GET_TIMING:
2332 error = PR_TIMING_STATISTICAL;
2333 break;
2334 case PR_SET_TIMING:
2335 if (arg2 != PR_TIMING_STATISTICAL)
2336 error = -EINVAL;
2337 break;
2338 case PR_SET_NAME:
2339 comm[sizeof(me->comm) - 1] = 0;
2340 if (strncpy_from_user(comm, (char __user *)arg2,
2341 sizeof(me->comm) - 1) < 0)
2342 return -EFAULT;
2343 set_task_comm(me, comm);
2344 proc_comm_connector(me);
2345 break;
2346 case PR_GET_NAME:
2347 get_task_comm(comm, me);
2348 if (copy_to_user((char __user *)arg2, comm, sizeof(comm)))
2349 return -EFAULT;
2350 break;
2351 case PR_GET_ENDIAN:
2352 error = GET_ENDIAN(me, arg2);
2353 break;
2354 case PR_SET_ENDIAN:
2355 error = SET_ENDIAN(me, arg2);
2356 break;
2357 case PR_GET_SECCOMP:
2358 error = prctl_get_seccomp();
2359 break;
2360 case PR_SET_SECCOMP:
2361 error = prctl_set_seccomp(arg2, (char __user *)arg3);
2362 break;
2363 case PR_GET_TSC:
2364 error = GET_TSC_CTL(arg2);
2365 break;
2366 case PR_SET_TSC:
2367 error = SET_TSC_CTL(arg2);
2368 break;
2369 case PR_TASK_PERF_EVENTS_DISABLE:
2370 error = perf_event_task_disable();
2371 break;
2372 case PR_TASK_PERF_EVENTS_ENABLE:
2373 error = perf_event_task_enable();
2374 break;
2375 case PR_GET_TIMERSLACK:
da8b44d5
JS		 2376 if (current->timer_slack_ns > ULONG_MAX)
2377 error = ULONG_MAX;
2378 else
2379 error = current->timer_slack_ns;
f3cbd435
AM		 2380 break;
2381 case PR_SET_TIMERSLACK:
2382 if (arg2 <= 0)
2383 current->timer_slack_ns =
6976675d 2384 current->default_timer_slack_ns;
f3cbd435
AM		 2385 else
2386 current->timer_slack_ns = arg2;
2387 break;
2388 case PR_MCE_KILL:
2389 if (arg4 | arg5)
2390 return -EINVAL;
2391 switch (arg2) {
2392 case PR_MCE_KILL_CLEAR:
2393 if (arg3 != 0)
4db96cf0 2394 return -EINVAL;
f3cbd435 2395 current->flags &= ~PF_MCE_PROCESS;
4db96cf0 2396 break;
f3cbd435
AM		 2397 case PR_MCE_KILL_SET:
2398 current->flags |= PF_MCE_PROCESS;
2399 if (arg3 == PR_MCE_KILL_EARLY)
2400 current->flags |= PF_MCE_EARLY;
2401 else if (arg3 == PR_MCE_KILL_LATE)
2402 current->flags &= ~PF_MCE_EARLY;
2403 else if (arg3 == PR_MCE_KILL_DEFAULT)
2404 current->flags &=
2405 ~(PF_MCE_EARLY|PF_MCE_PROCESS);
1087e9b4 2406 else
259e5e6c 2407 return -EINVAL;
259e5e6c 2408 break;
1da177e4 2409 default:
f3cbd435
AM		 2410 return -EINVAL;
2411 }
2412 break;
2413 case PR_MCE_KILL_GET:
2414 if (arg2 | arg3 | arg4 | arg5)
2415 return -EINVAL;
2416 if (current->flags & PF_MCE_PROCESS)
2417 error = (current->flags & PF_MCE_EARLY) ?
2418 PR_MCE_KILL_EARLY : PR_MCE_KILL_LATE;
2419 else
2420 error = PR_MCE_KILL_DEFAULT;
2421 break;
2422 case PR_SET_MM:
2423 error = prctl_set_mm(arg2, arg3, arg4, arg5);
2424 break;
2425 case PR_GET_TID_ADDRESS:
986b9eac 2426 error = prctl_get_tid_address(me, (int __user * __user *)arg2);
f3cbd435
AM		 2427 break;
2428 case PR_SET_CHILD_SUBREAPER:
2429 me->signal->is_child_subreaper = !!arg2;
749860ce
PT		 2430 if (!arg2)
2431 break;
2432
2433 walk_process_tree(me, propagate_has_child_subreaper, NULL);
f3cbd435
AM		 2434 break;
2435 case PR_GET_CHILD_SUBREAPER:
2436 error = put_user(me->signal->is_child_subreaper,
2437 (int __user *)arg2);
2438 break;
2439 case PR_SET_NO_NEW_PRIVS:
2440 if (arg2 != 1 || arg3 || arg4 || arg5)
2441 return -EINVAL;
2442
1d4457f9 2443 task_set_no_new_privs(current);
f3cbd435
AM		 2444 break;
2445 case PR_GET_NO_NEW_PRIVS:
2446 if (arg2 || arg3 || arg4 || arg5)
2447 return -EINVAL;
1d4457f9 2448 return task_no_new_privs(current) ? 1 : 0;
a0715cc2
AT		 2449 case PR_GET_THP_DISABLE:
2450 if (arg2 || arg3 || arg4 || arg5)
2451 return -EINVAL;
18600332 2452 error = !!test_bit(MMF_DISABLE_THP, &me->mm->flags);
a0715cc2
AT		 2453 break;
2454 case PR_SET_THP_DISABLE:
2455 if (arg3 || arg4 || arg5)
2456 return -EINVAL;
d8ed45c5 2457 if (mmap_write_lock_killable(me->mm))
17b0573d 2458 return -EINTR;
a0715cc2 2459 if (arg2)
18600332 2460 set_bit(MMF_DISABLE_THP, &me->mm->flags);
a0715cc2 2461 else
18600332 2462 clear_bit(MMF_DISABLE_THP, &me->mm->flags);
d8ed45c5 2463 mmap_write_unlock(me->mm);
a0715cc2 2464 break;
fe3d197f 2465 case PR_MPX_ENABLE_MANAGEMENT:
fe3d197f 2466 case PR_MPX_DISABLE_MANAGEMENT:
f240652b
DH		 2467 /* No longer implemented: */
2468 return -EINVAL;
9791554b
PB		 2469 case PR_SET_FP_MODE:
2470 error = SET_FP_MODE(me, arg2);
2471 break;
2472 case PR_GET_FP_MODE:
2473 error = GET_FP_MODE(me);
2474 break;
2d2123bc
DM		 2475 case PR_SVE_SET_VL:
2476 error = SVE_SET_VL(arg2);
2477 break;
2478 case PR_SVE_GET_VL:
2479 error = SVE_GET_VL();
2480 break;
b617cfc8
TG		 2481 case PR_GET_SPECULATION_CTRL:
2482 if (arg3 || arg4 || arg5)
2483 return -EINVAL;
7bbf1373 2484 error = arch_prctl_spec_ctrl_get(me, arg2);
b617cfc8
TG		 2485 break;
2486 case PR_SET_SPECULATION_CTRL:
2487 if (arg4 || arg5)
2488 return -EINVAL;
7bbf1373 2489 error = arch_prctl_spec_ctrl_set(me, arg2, arg3);
b617cfc8 2490 break;
ba830885
KM		 2491 case PR_PAC_RESET_KEYS:
2492 if (arg3 || arg4 || arg5)
2493 return -EINVAL;
2494 error = PAC_RESET_KEYS(me, arg2);
2495 break;
20169862
PC		 2496 case PR_PAC_SET_ENABLED_KEYS:
2497 if (arg4 || arg5)
2498 return -EINVAL;
2499 error = PAC_SET_ENABLED_KEYS(me, arg2, arg3);
2500 break;
2501 case PR_PAC_GET_ENABLED_KEYS:
2502 if (arg2 || arg3 || arg4 || arg5)
2503 return -EINVAL;
2504 error = PAC_GET_ENABLED_KEYS(me);
2505 break;
63f0c603 2506 case PR_SET_TAGGED_ADDR_CTRL:
3e91ec89
CM		 2507 if (arg3 || arg4 || arg5)
2508 return -EINVAL;
63f0c603
CM		 2509 error = SET_TAGGED_ADDR_CTRL(arg2);
2510 break;
2511 case PR_GET_TAGGED_ADDR_CTRL:
3e91ec89
CM		 2512 if (arg2 || arg3 || arg4 || arg5)
2513 return -EINVAL;
63f0c603
CM		 2514 error = GET_TAGGED_ADDR_CTRL();
2515 break;
8d19f1c8
MC		 2516 case PR_SET_IO_FLUSHER:
2517 if (!capable(CAP_SYS_RESOURCE))
2518 return -EPERM;
2519
2520 if (arg3 || arg4 || arg5)
2521 return -EINVAL;
2522
2523 if (arg2 == 1)
2524 current->flags |= PR_IO_FLUSHER;
2525 else if (!arg2)
2526 current->flags &= ~PR_IO_FLUSHER;
2527 else
2528 return -EINVAL;
2529 break;
2530 case PR_GET_IO_FLUSHER:
2531 if (!capable(CAP_SYS_RESOURCE))
2532 return -EPERM;
2533
2534 if (arg2 || arg3 || arg4 || arg5)
2535 return -EINVAL;
2536
2537 error = (current->flags & PR_IO_FLUSHER) == PR_IO_FLUSHER;
2538 break;
1446e1df
GKB		 2539 case PR_SET_SYSCALL_USER_DISPATCH:
2540 error = set_syscall_user_dispatch(arg2, arg3, arg4,
2541 (char __user *) arg5);
2542 break;
7ac592aa
CH		 2543#ifdef CONFIG_SCHED_CORE
2544 case PR_SCHED_CORE:
2545 error = sched_core_share_pid(arg2, arg3, arg4, arg5);
2546 break;
2547#endif
f3cbd435
AM		 2548 default:
2549 error = -EINVAL;
2550 break;
1da177e4
LT		 2551 }
2552 return error;
2553}
3cfc348b 2554
836f92ad
HC		 2555SYSCALL_DEFINE3(getcpu, unsigned __user *, cpup, unsigned __user *, nodep,
2556 struct getcpu_cache __user *, unused)
3cfc348b
AK		 2557{
2558 int err = 0;
2559 int cpu = raw_smp_processor_id();
ec94fc3d 2560
3cfc348b
AK		 2561 if (cpup)
2562 err |= put_user(cpu, cpup);
2563 if (nodep)
2564 err |= put_user(cpu_to_node(cpu), nodep);
3cfc348b
AK		 2565 return err ? -EFAULT : 0;
2566}
10a0a8d4 2567
4a22f166
SR		 2568/**
2569 * do_sysinfo - fill in sysinfo struct
2570 * @info: pointer to buffer to fill
2571 */
2572static int do_sysinfo(struct sysinfo *info)
2573{
2574 unsigned long mem_total, sav_total;
2575 unsigned int mem_unit, bitcount;
dc1b7b6c 2576 struct timespec64 tp;
4a22f166
SR		 2577
2578 memset(info, 0, sizeof(struct sysinfo));
2579
dc1b7b6c 2580 ktime_get_boottime_ts64(&tp);
ecc421e0 2581 timens_add_boottime(&tp);
4a22f166
SR		 2582 info->uptime = tp.tv_sec + (tp.tv_nsec ? 1 : 0);
2583
2584 get_avenrun(info->loads, 0, SI_LOAD_SHIFT - FSHIFT);
2585
2586 info->procs = nr_threads;
2587
2588 si_meminfo(info);
2589 si_swapinfo(info);
2590
2591 /*
2592 * If the sum of all the available memory (i.e. ram + swap)
2593 * is less than can be stored in a 32 bit unsigned long then
2594 * we can be binary compatible with 2.2.x kernels. If not,
2595 * well, in that case 2.2.x was broken anyways...
2596 *
2597 * -Erik Andersen <andersee@debian.org>
2598 */
2599
2600 mem_total = info->totalram + info->totalswap;
2601 if (mem_total < info->totalram || mem_total < info->totalswap)
2602 goto out;
2603 bitcount = 0;
2604 mem_unit = info->mem_unit;
2605 while (mem_unit > 1) {
2606 bitcount++;
2607 mem_unit >>= 1;
2608 sav_total = mem_total;
2609 mem_total <<= 1;
2610 if (mem_total < sav_total)
2611 goto out;
2612 }
2613
2614 /*
2615 * If mem_total did not overflow, multiply all memory values by
2616 * info->mem_unit and set it to 1. This leaves things compatible
2617 * with 2.2.x, and also retains compatibility with earlier 2.4.x
2618 * kernels...
2619 */
2620
2621 info->mem_unit = 1;
2622 info->totalram <<= bitcount;
2623 info->freeram <<= bitcount;
2624 info->sharedram <<= bitcount;
2625 info->bufferram <<= bitcount;
2626 info->totalswap <<= bitcount;
2627 info->freeswap <<= bitcount;
2628 info->totalhigh <<= bitcount;
2629 info->freehigh <<= bitcount;
2630
2631out:
2632 return 0;
2633}
2634
2635SYSCALL_DEFINE1(sysinfo, struct sysinfo __user *, info)
2636{
2637 struct sysinfo val;
2638
2639 do_sysinfo(&val);
2640
2641 if (copy_to_user(info, &val, sizeof(struct sysinfo)))
2642 return -EFAULT;
2643
2644 return 0;
2645}
2646
2647#ifdef CONFIG_COMPAT
2648struct compat_sysinfo {
2649 s32 uptime;
2650 u32 loads[3];
2651 u32 totalram;
2652 u32 freeram;
2653 u32 sharedram;
2654 u32 bufferram;
2655 u32 totalswap;
2656 u32 freeswap;
2657 u16 procs;
2658 u16 pad;
2659 u32 totalhigh;
2660 u32 freehigh;
2661 u32 mem_unit;
2662 char _f[20-2*sizeof(u32)-sizeof(int)];
2663};
2664
2665COMPAT_SYSCALL_DEFINE1(sysinfo, struct compat_sysinfo __user *, info)
2666{
2667 struct sysinfo s;
ce5155c4 2668 struct compat_sysinfo s_32;
4a22f166
SR		 2669
2670 do_sysinfo(&s);
2671
2672 /* Check to see if any memory value is too large for 32-bit and scale
2673 * down if needed
2674 */
0baae41e 2675 if (upper_32_bits(s.totalram) || upper_32_bits(s.totalswap)) {
4a22f166
SR		 2676 int bitcount = 0;
2677
2678 while (s.mem_unit < PAGE_SIZE) {
2679 s.mem_unit <<= 1;
2680 bitcount++;
2681 }
2682
2683 s.totalram >>= bitcount;
2684 s.freeram >>= bitcount;
2685 s.sharedram >>= bitcount;
2686 s.bufferram >>= bitcount;
2687 s.totalswap >>= bitcount;
2688 s.freeswap >>= bitcount;
2689 s.totalhigh >>= bitcount;
2690 s.freehigh >>= bitcount;
2691 }
2692
ce5155c4
AV		 2693 memset(&s_32, 0, sizeof(s_32));
2694 s_32.uptime = s.uptime;
2695 s_32.loads[0] = s.loads[0];
2696 s_32.loads[1] = s.loads[1];
2697 s_32.loads[2] = s.loads[2];
2698 s_32.totalram = s.totalram;
2699 s_32.freeram = s.freeram;
2700 s_32.sharedram = s.sharedram;
2701 s_32.bufferram = s.bufferram;
2702 s_32.totalswap = s.totalswap;
2703 s_32.freeswap = s.freeswap;
2704 s_32.procs = s.procs;
2705 s_32.totalhigh = s.totalhigh;
2706 s_32.freehigh = s.freehigh;
2707 s_32.mem_unit = s.mem_unit;
2708 if (copy_to_user(info, &s_32, sizeof(s_32)))
4a22f166 2709 return -EFAULT;
4a22f166
SR		 2710 return 0;
2711}
2712#endif /* CONFIG_COMPAT */
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