Commit | Line | Data |
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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 | 9 | #include <linux/mm.h> |
5c26f6ac | 10 | #include <linux/mm_inline.h> |
1da177e4 LT |
11 | #include <linux/utsname.h> |
12 | #include <linux/mman.h> | |
1da177e4 LT |
13 | #include <linux/reboot.h> |
14 | #include <linux/prctl.h> | |
1da177e4 LT |
15 | #include <linux/highuid.h> |
16 | #include <linux/fs.h> | |
74da1ff7 | 17 | #include <linux/kmod.h> |
d7597f59 | 18 | #include <linux/ksm.h> |
cdd6c482 | 19 | #include <linux/perf_event.h> |
3e88c553 | 20 | #include <linux/resource.h> |
dc009d92 | 21 | #include <linux/kernel.h> |
1da177e4 | 22 | #include <linux/workqueue.h> |
c59ede7b | 23 | #include <linux/capability.h> |
1da177e4 LT |
24 | #include <linux/device.h> |
25 | #include <linux/key.h> | |
26 | #include <linux/times.h> | |
27 | #include <linux/posix-timers.h> | |
28 | #include <linux/security.h> | |
37608ba3 | 29 | #include <linux/random.h> |
1da177e4 LT |
30 | #include <linux/suspend.h> |
31 | #include <linux/tty.h> | |
7ed20e1a | 32 | #include <linux/signal.h> |
9f46080c | 33 | #include <linux/cn_proc.h> |
3cfc348b | 34 | #include <linux/getcpu.h> |
6eaeeaba | 35 | #include <linux/task_io_accounting_ops.h> |
1d9d02fe | 36 | #include <linux/seccomp.h> |
4047727e | 37 | #include <linux/cpu.h> |
e28cbf22 | 38 | #include <linux/personality.h> |
e3d5a27d | 39 | #include <linux/ptrace.h> |
5ad4e53b | 40 | #include <linux/fs_struct.h> |
b32dfe37 CG |
41 | #include <linux/file.h> |
42 | #include <linux/mount.h> | |
5a0e3ad6 | 43 | #include <linux/gfp.h> |
40dc166c | 44 | #include <linux/syscore_ops.h> |
be27425d AK |
45 | #include <linux/version.h> |
46 | #include <linux/ctype.h> | |
1446e1df | 47 | #include <linux/syscall_user_dispatch.h> |
1da177e4 LT |
48 | |
49 | #include <linux/compat.h> | |
50 | #include <linux/syscalls.h> | |
00d7c05a | 51 | #include <linux/kprobes.h> |
acce292c | 52 | #include <linux/user_namespace.h> |
ecc421e0 | 53 | #include <linux/time_namespace.h> |
7fe5e042 | 54 | #include <linux/binfmts.h> |
1da177e4 | 55 | |
4a22f166 | 56 | #include <linux/sched.h> |
4eb5aaa3 | 57 | #include <linux/sched/autogroup.h> |
4f17722c | 58 | #include <linux/sched/loadavg.h> |
03441a34 | 59 | #include <linux/sched/stat.h> |
6e84f315 | 60 | #include <linux/sched/mm.h> |
f7ccbae4 | 61 | #include <linux/sched/coredump.h> |
29930025 | 62 | #include <linux/sched/task.h> |
32ef5517 | 63 | #include <linux/sched/cputime.h> |
4a22f166 SR |
64 | #include <linux/rcupdate.h> |
65 | #include <linux/uidgid.h> | |
66 | #include <linux/cred.h> | |
67 | ||
b617cfc8 TG |
68 | #include <linux/nospec.h> |
69 | ||
04c6862c | 70 | #include <linux/kmsg_dump.h> |
be27425d AK |
71 | /* Move somewhere else to avoid recompiling? */ |
72 | #include <generated/utsrelease.h> | |
04c6862c | 73 | |
7c0f6ba6 | 74 | #include <linux/uaccess.h> |
1da177e4 LT |
75 | #include <asm/io.h> |
76 | #include <asm/unistd.h> | |
77 | ||
e530dca5 DB |
78 | #include "uid16.h" |
79 | ||
1da177e4 | 80 | #ifndef SET_UNALIGN_CTL |
ec94fc3d | 81 | # define SET_UNALIGN_CTL(a, b) (-EINVAL) |
1da177e4 LT |
82 | #endif |
83 | #ifndef GET_UNALIGN_CTL | |
ec94fc3d | 84 | # define GET_UNALIGN_CTL(a, b) (-EINVAL) |
1da177e4 LT |
85 | #endif |
86 | #ifndef SET_FPEMU_CTL | |
ec94fc3d | 87 | # define SET_FPEMU_CTL(a, b) (-EINVAL) |
1da177e4 LT |
88 | #endif |
89 | #ifndef GET_FPEMU_CTL | |
ec94fc3d | 90 | # define GET_FPEMU_CTL(a, b) (-EINVAL) |
1da177e4 LT |
91 | #endif |
92 | #ifndef SET_FPEXC_CTL | |
ec94fc3d | 93 | # define SET_FPEXC_CTL(a, b) (-EINVAL) |
1da177e4 LT |
94 | #endif |
95 | #ifndef GET_FPEXC_CTL | |
ec94fc3d | 96 | # define GET_FPEXC_CTL(a, b) (-EINVAL) |
1da177e4 | 97 | #endif |
651d765d | 98 | #ifndef GET_ENDIAN |
ec94fc3d | 99 | # define GET_ENDIAN(a, b) (-EINVAL) |
651d765d AB |
100 | #endif |
101 | #ifndef SET_ENDIAN | |
ec94fc3d | 102 | # define SET_ENDIAN(a, b) (-EINVAL) |
651d765d | 103 | #endif |
8fb402bc EB |
104 | #ifndef GET_TSC_CTL |
105 | # define GET_TSC_CTL(a) (-EINVAL) | |
106 | #endif | |
107 | #ifndef SET_TSC_CTL | |
108 | # define SET_TSC_CTL(a) (-EINVAL) | |
109 | #endif | |
9791554b PB |
110 | #ifndef GET_FP_MODE |
111 | # define GET_FP_MODE(a) (-EINVAL) | |
112 | #endif | |
113 | #ifndef SET_FP_MODE | |
114 | # define SET_FP_MODE(a,b) (-EINVAL) | |
115 | #endif | |
2d2123bc DM |
116 | #ifndef SVE_SET_VL |
117 | # define SVE_SET_VL(a) (-EINVAL) | |
118 | #endif | |
119 | #ifndef SVE_GET_VL | |
120 | # define SVE_GET_VL() (-EINVAL) | |
121 | #endif | |
9e4ab6c8 MB |
122 | #ifndef SME_SET_VL |
123 | # define SME_SET_VL(a) (-EINVAL) | |
124 | #endif | |
125 | #ifndef SME_GET_VL | |
126 | # define SME_GET_VL() (-EINVAL) | |
127 | #endif | |
ba830885 KM |
128 | #ifndef PAC_RESET_KEYS |
129 | # define PAC_RESET_KEYS(a, b) (-EINVAL) | |
130 | #endif | |
20169862 PC |
131 | #ifndef PAC_SET_ENABLED_KEYS |
132 | # define PAC_SET_ENABLED_KEYS(a, b, c) (-EINVAL) | |
133 | #endif | |
134 | #ifndef PAC_GET_ENABLED_KEYS | |
135 | # define PAC_GET_ENABLED_KEYS(a) (-EINVAL) | |
136 | #endif | |
63f0c603 CM |
137 | #ifndef SET_TAGGED_ADDR_CTRL |
138 | # define SET_TAGGED_ADDR_CTRL(a) (-EINVAL) | |
139 | #endif | |
140 | #ifndef GET_TAGGED_ADDR_CTRL | |
141 | # define GET_TAGGED_ADDR_CTRL() (-EINVAL) | |
142 | #endif | |
1da177e4 LT |
143 | |
144 | /* | |
145 | * this is where the system-wide overflow UID and GID are defined, for | |
146 | * architectures that now have 32-bit UID/GID but didn't in the past | |
147 | */ | |
148 | ||
149 | int overflowuid = DEFAULT_OVERFLOWUID; | |
150 | int overflowgid = DEFAULT_OVERFLOWGID; | |
151 | ||
1da177e4 LT |
152 | EXPORT_SYMBOL(overflowuid); |
153 | EXPORT_SYMBOL(overflowgid); | |
1da177e4 LT |
154 | |
155 | /* | |
156 | * the same as above, but for filesystems which can only store a 16-bit | |
157 | * UID and GID. as such, this is needed on all architectures | |
158 | */ | |
159 | ||
160 | int fs_overflowuid = DEFAULT_FS_OVERFLOWUID; | |
8b2770a4 | 161 | int fs_overflowgid = DEFAULT_FS_OVERFLOWGID; |
1da177e4 LT |
162 | |
163 | EXPORT_SYMBOL(fs_overflowuid); | |
164 | EXPORT_SYMBOL(fs_overflowgid); | |
165 | ||
fc832ad3 SH |
166 | /* |
167 | * Returns true if current's euid is same as p's uid or euid, | |
168 | * or has CAP_SYS_NICE to p's user_ns. | |
169 | * | |
170 | * Called with rcu_read_lock, creds are safe | |
171 | */ | |
172 | static bool set_one_prio_perm(struct task_struct *p) | |
173 | { | |
174 | const struct cred *cred = current_cred(), *pcred = __task_cred(p); | |
175 | ||
5af66203 EB |
176 | if (uid_eq(pcred->uid, cred->euid) || |
177 | uid_eq(pcred->euid, cred->euid)) | |
fc832ad3 | 178 | return true; |
c4a4d603 | 179 | if (ns_capable(pcred->user_ns, CAP_SYS_NICE)) |
fc832ad3 SH |
180 | return true; |
181 | return false; | |
182 | } | |
183 | ||
c69e8d9c DH |
184 | /* |
185 | * set the priority of a task | |
186 | * - the caller must hold the RCU read lock | |
187 | */ | |
1da177e4 LT |
188 | static int set_one_prio(struct task_struct *p, int niceval, int error) |
189 | { | |
190 | int no_nice; | |
191 | ||
fc832ad3 | 192 | if (!set_one_prio_perm(p)) { |
1da177e4 LT |
193 | error = -EPERM; |
194 | goto out; | |
195 | } | |
e43379f1 | 196 | if (niceval < task_nice(p) && !can_nice(p, niceval)) { |
1da177e4 LT |
197 | error = -EACCES; |
198 | goto out; | |
199 | } | |
200 | no_nice = security_task_setnice(p, niceval); | |
201 | if (no_nice) { | |
202 | error = no_nice; | |
203 | goto out; | |
204 | } | |
205 | if (error == -ESRCH) | |
206 | error = 0; | |
207 | set_user_nice(p, niceval); | |
208 | out: | |
209 | return error; | |
210 | } | |
211 | ||
754fe8d2 | 212 | SYSCALL_DEFINE3(setpriority, int, which, int, who, int, niceval) |
1da177e4 LT |
213 | { |
214 | struct task_struct *g, *p; | |
215 | struct user_struct *user; | |
86a264ab | 216 | const struct cred *cred = current_cred(); |
1da177e4 | 217 | int error = -EINVAL; |
41487c65 | 218 | struct pid *pgrp; |
7b44ab97 | 219 | kuid_t uid; |
1da177e4 | 220 | |
3e88c553 | 221 | if (which > PRIO_USER || which < PRIO_PROCESS) |
1da177e4 LT |
222 | goto out; |
223 | ||
224 | /* normalize: avoid signed division (rounding problems) */ | |
225 | error = -ESRCH; | |
c4a4d2f4 DY |
226 | if (niceval < MIN_NICE) |
227 | niceval = MIN_NICE; | |
228 | if (niceval > MAX_NICE) | |
229 | niceval = MAX_NICE; | |
1da177e4 | 230 | |
d4581a23 | 231 | rcu_read_lock(); |
1da177e4 | 232 | switch (which) { |
ec94fc3d | 233 | case PRIO_PROCESS: |
234 | if (who) | |
235 | p = find_task_by_vpid(who); | |
236 | else | |
237 | p = current; | |
238 | if (p) | |
239 | error = set_one_prio(p, niceval, error); | |
240 | break; | |
241 | case PRIO_PGRP: | |
242 | if (who) | |
243 | pgrp = find_vpid(who); | |
244 | else | |
245 | pgrp = task_pgrp(current); | |
7f8ca0ed | 246 | read_lock(&tasklist_lock); |
ec94fc3d | 247 | do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { |
248 | error = set_one_prio(p, niceval, error); | |
249 | } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); | |
7f8ca0ed | 250 | read_unlock(&tasklist_lock); |
ec94fc3d | 251 | break; |
252 | case PRIO_USER: | |
253 | uid = make_kuid(cred->user_ns, who); | |
254 | user = cred->user; | |
255 | if (!who) | |
256 | uid = cred->uid; | |
257 | else if (!uid_eq(uid, cred->uid)) { | |
258 | user = find_user(uid); | |
259 | if (!user) | |
86a264ab | 260 | goto out_unlock; /* No processes for this user */ |
ec94fc3d | 261 | } |
7f8ca0ed | 262 | for_each_process_thread(g, p) { |
8639b461 | 263 | if (uid_eq(task_uid(p), uid) && task_pid_vnr(p)) |
ec94fc3d | 264 | error = set_one_prio(p, niceval, error); |
7f8ca0ed | 265 | } |
ec94fc3d | 266 | if (!uid_eq(uid, cred->uid)) |
267 | free_uid(user); /* For find_user() */ | |
268 | break; | |
1da177e4 LT |
269 | } |
270 | out_unlock: | |
d4581a23 | 271 | rcu_read_unlock(); |
1da177e4 LT |
272 | out: |
273 | return error; | |
274 | } | |
275 | ||
276 | /* | |
277 | * Ugh. To avoid negative return values, "getpriority()" will | |
278 | * not return the normal nice-value, but a negated value that | |
279 | * has been offset by 20 (ie it returns 40..1 instead of -20..19) | |
280 | * to stay compatible. | |
281 | */ | |
754fe8d2 | 282 | SYSCALL_DEFINE2(getpriority, int, which, int, who) |
1da177e4 LT |
283 | { |
284 | struct task_struct *g, *p; | |
285 | struct user_struct *user; | |
86a264ab | 286 | const struct cred *cred = current_cred(); |
1da177e4 | 287 | long niceval, retval = -ESRCH; |
41487c65 | 288 | struct pid *pgrp; |
7b44ab97 | 289 | kuid_t uid; |
1da177e4 | 290 | |
3e88c553 | 291 | if (which > PRIO_USER || which < PRIO_PROCESS) |
1da177e4 LT |
292 | return -EINVAL; |
293 | ||
70118837 | 294 | rcu_read_lock(); |
1da177e4 | 295 | switch (which) { |
ec94fc3d | 296 | case PRIO_PROCESS: |
297 | if (who) | |
298 | p = find_task_by_vpid(who); | |
299 | else | |
300 | p = current; | |
301 | if (p) { | |
302 | niceval = nice_to_rlimit(task_nice(p)); | |
303 | if (niceval > retval) | |
304 | retval = niceval; | |
305 | } | |
306 | break; | |
307 | case PRIO_PGRP: | |
308 | if (who) | |
309 | pgrp = find_vpid(who); | |
310 | else | |
311 | pgrp = task_pgrp(current); | |
7f8ca0ed | 312 | read_lock(&tasklist_lock); |
ec94fc3d | 313 | do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { |
314 | niceval = nice_to_rlimit(task_nice(p)); | |
315 | if (niceval > retval) | |
316 | retval = niceval; | |
317 | } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); | |
7f8ca0ed | 318 | read_unlock(&tasklist_lock); |
ec94fc3d | 319 | break; |
320 | case PRIO_USER: | |
321 | uid = make_kuid(cred->user_ns, who); | |
322 | user = cred->user; | |
323 | if (!who) | |
324 | uid = cred->uid; | |
325 | else if (!uid_eq(uid, cred->uid)) { | |
326 | user = find_user(uid); | |
327 | if (!user) | |
328 | goto out_unlock; /* No processes for this user */ | |
329 | } | |
7f8ca0ed | 330 | for_each_process_thread(g, p) { |
8639b461 | 331 | if (uid_eq(task_uid(p), uid) && task_pid_vnr(p)) { |
7aa2c016 | 332 | niceval = nice_to_rlimit(task_nice(p)); |
1da177e4 LT |
333 | if (niceval > retval) |
334 | retval = niceval; | |
335 | } | |
7f8ca0ed | 336 | } |
ec94fc3d | 337 | if (!uid_eq(uid, cred->uid)) |
338 | free_uid(user); /* for find_user() */ | |
339 | break; | |
1da177e4 LT |
340 | } |
341 | out_unlock: | |
70118837 | 342 | rcu_read_unlock(); |
1da177e4 LT |
343 | |
344 | return retval; | |
345 | } | |
346 | ||
1da177e4 LT |
347 | /* |
348 | * Unprivileged users may change the real gid to the effective gid | |
349 | * or vice versa. (BSD-style) | |
350 | * | |
351 | * If you set the real gid at all, or set the effective gid to a value not | |
352 | * equal to the real gid, then the saved gid is set to the new effective gid. | |
353 | * | |
354 | * This makes it possible for a setgid program to completely drop its | |
355 | * privileges, which is often a useful assertion to make when you are doing | |
356 | * a security audit over a program. | |
357 | * | |
358 | * The general idea is that a program which uses just setregid() will be | |
359 | * 100% compatible with BSD. A program which uses just setgid() will be | |
ec94fc3d | 360 | * 100% compatible with POSIX with saved IDs. |
1da177e4 LT |
361 | * |
362 | * SMP: There are not races, the GIDs are checked only by filesystem | |
363 | * operations (as far as semantic preservation is concerned). | |
364 | */ | |
2813893f | 365 | #ifdef CONFIG_MULTIUSER |
e530dca5 | 366 | long __sys_setregid(gid_t rgid, gid_t egid) |
1da177e4 | 367 | { |
a29c33f4 | 368 | struct user_namespace *ns = current_user_ns(); |
d84f4f99 DH |
369 | const struct cred *old; |
370 | struct cred *new; | |
1da177e4 | 371 | int retval; |
a29c33f4 EB |
372 | kgid_t krgid, kegid; |
373 | ||
374 | krgid = make_kgid(ns, rgid); | |
375 | kegid = make_kgid(ns, egid); | |
376 | ||
377 | if ((rgid != (gid_t) -1) && !gid_valid(krgid)) | |
378 | return -EINVAL; | |
379 | if ((egid != (gid_t) -1) && !gid_valid(kegid)) | |
380 | return -EINVAL; | |
1da177e4 | 381 | |
d84f4f99 DH |
382 | new = prepare_creds(); |
383 | if (!new) | |
384 | return -ENOMEM; | |
385 | old = current_cred(); | |
386 | ||
d84f4f99 | 387 | retval = -EPERM; |
1da177e4 | 388 | if (rgid != (gid_t) -1) { |
a29c33f4 EB |
389 | if (gid_eq(old->gid, krgid) || |
390 | gid_eq(old->egid, krgid) || | |
111767c1 | 391 | ns_capable_setid(old->user_ns, CAP_SETGID)) |
a29c33f4 | 392 | new->gid = krgid; |
1da177e4 | 393 | else |
d84f4f99 | 394 | goto error; |
1da177e4 LT |
395 | } |
396 | if (egid != (gid_t) -1) { | |
a29c33f4 EB |
397 | if (gid_eq(old->gid, kegid) || |
398 | gid_eq(old->egid, kegid) || | |
399 | gid_eq(old->sgid, kegid) || | |
111767c1 | 400 | ns_capable_setid(old->user_ns, CAP_SETGID)) |
a29c33f4 | 401 | new->egid = kegid; |
756184b7 | 402 | else |
d84f4f99 | 403 | goto error; |
1da177e4 | 404 | } |
d84f4f99 | 405 | |
1da177e4 | 406 | if (rgid != (gid_t) -1 || |
a29c33f4 | 407 | (egid != (gid_t) -1 && !gid_eq(kegid, old->gid))) |
d84f4f99 DH |
408 | new->sgid = new->egid; |
409 | new->fsgid = new->egid; | |
410 | ||
39030e13 TC |
411 | retval = security_task_fix_setgid(new, old, LSM_SETID_RE); |
412 | if (retval < 0) | |
413 | goto error; | |
414 | ||
d84f4f99 DH |
415 | return commit_creds(new); |
416 | ||
417 | error: | |
418 | abort_creds(new); | |
419 | return retval; | |
1da177e4 LT |
420 | } |
421 | ||
e530dca5 DB |
422 | SYSCALL_DEFINE2(setregid, gid_t, rgid, gid_t, egid) |
423 | { | |
424 | return __sys_setregid(rgid, egid); | |
425 | } | |
426 | ||
1da177e4 | 427 | /* |
ec94fc3d | 428 | * setgid() is implemented like SysV w/ SAVED_IDS |
1da177e4 LT |
429 | * |
430 | * SMP: Same implicit races as above. | |
431 | */ | |
e530dca5 | 432 | long __sys_setgid(gid_t gid) |
1da177e4 | 433 | { |
a29c33f4 | 434 | struct user_namespace *ns = current_user_ns(); |
d84f4f99 DH |
435 | const struct cred *old; |
436 | struct cred *new; | |
1da177e4 | 437 | int retval; |
a29c33f4 EB |
438 | kgid_t kgid; |
439 | ||
440 | kgid = make_kgid(ns, gid); | |
441 | if (!gid_valid(kgid)) | |
442 | return -EINVAL; | |
1da177e4 | 443 | |
d84f4f99 DH |
444 | new = prepare_creds(); |
445 | if (!new) | |
446 | return -ENOMEM; | |
447 | old = current_cred(); | |
448 | ||
d84f4f99 | 449 | retval = -EPERM; |
111767c1 | 450 | if (ns_capable_setid(old->user_ns, CAP_SETGID)) |
a29c33f4 EB |
451 | new->gid = new->egid = new->sgid = new->fsgid = kgid; |
452 | else if (gid_eq(kgid, old->gid) || gid_eq(kgid, old->sgid)) | |
453 | new->egid = new->fsgid = kgid; | |
1da177e4 | 454 | else |
d84f4f99 | 455 | goto error; |
1da177e4 | 456 | |
39030e13 TC |
457 | retval = security_task_fix_setgid(new, old, LSM_SETID_ID); |
458 | if (retval < 0) | |
459 | goto error; | |
460 | ||
d84f4f99 DH |
461 | return commit_creds(new); |
462 | ||
463 | error: | |
464 | abort_creds(new); | |
465 | return retval; | |
1da177e4 | 466 | } |
54e99124 | 467 | |
e530dca5 DB |
468 | SYSCALL_DEFINE1(setgid, gid_t, gid) |
469 | { | |
470 | return __sys_setgid(gid); | |
471 | } | |
472 | ||
d84f4f99 DH |
473 | /* |
474 | * change the user struct in a credentials set to match the new UID | |
475 | */ | |
476 | static int set_user(struct cred *new) | |
1da177e4 LT |
477 | { |
478 | struct user_struct *new_user; | |
479 | ||
078de5f7 | 480 | new_user = alloc_uid(new->uid); |
1da177e4 LT |
481 | if (!new_user) |
482 | return -EAGAIN; | |
483 | ||
c923a8e7 EB |
484 | free_uid(new->user); |
485 | new->user = new_user; | |
486 | return 0; | |
487 | } | |
488 | ||
489 | static void flag_nproc_exceeded(struct cred *new) | |
490 | { | |
491 | if (new->ucounts == current_ucounts()) | |
492 | return; | |
493 | ||
72fa5997 VK |
494 | /* |
495 | * We don't fail in case of NPROC limit excess here because too many | |
496 | * poorly written programs don't check set*uid() return code, assuming | |
497 | * it never fails if called by root. We may still enforce NPROC limit | |
498 | * for programs doing set*uid()+execve() by harmlessly deferring the | |
499 | * failure to the execve() stage. | |
500 | */ | |
de399236 | 501 | if (is_rlimit_overlimit(new->ucounts, UCOUNT_RLIMIT_NPROC, rlimit(RLIMIT_NPROC)) && |
c923a8e7 | 502 | new->user != INIT_USER) |
72fa5997 VK |
503 | current->flags |= PF_NPROC_EXCEEDED; |
504 | else | |
505 | current->flags &= ~PF_NPROC_EXCEEDED; | |
1da177e4 LT |
506 | } |
507 | ||
508 | /* | |
509 | * Unprivileged users may change the real uid to the effective uid | |
510 | * or vice versa. (BSD-style) | |
511 | * | |
512 | * If you set the real uid at all, or set the effective uid to a value not | |
513 | * equal to the real uid, then the saved uid is set to the new effective uid. | |
514 | * | |
515 | * This makes it possible for a setuid program to completely drop its | |
516 | * privileges, which is often a useful assertion to make when you are doing | |
517 | * a security audit over a program. | |
518 | * | |
519 | * The general idea is that a program which uses just setreuid() will be | |
520 | * 100% compatible with BSD. A program which uses just setuid() will be | |
ec94fc3d | 521 | * 100% compatible with POSIX with saved IDs. |
1da177e4 | 522 | */ |
e530dca5 | 523 | long __sys_setreuid(uid_t ruid, uid_t euid) |
1da177e4 | 524 | { |
a29c33f4 | 525 | struct user_namespace *ns = current_user_ns(); |
d84f4f99 DH |
526 | const struct cred *old; |
527 | struct cred *new; | |
1da177e4 | 528 | int retval; |
a29c33f4 EB |
529 | kuid_t kruid, keuid; |
530 | ||
531 | kruid = make_kuid(ns, ruid); | |
532 | keuid = make_kuid(ns, euid); | |
533 | ||
534 | if ((ruid != (uid_t) -1) && !uid_valid(kruid)) | |
535 | return -EINVAL; | |
536 | if ((euid != (uid_t) -1) && !uid_valid(keuid)) | |
537 | return -EINVAL; | |
1da177e4 | 538 | |
d84f4f99 DH |
539 | new = prepare_creds(); |
540 | if (!new) | |
541 | return -ENOMEM; | |
542 | old = current_cred(); | |
543 | ||
d84f4f99 | 544 | retval = -EPERM; |
1da177e4 | 545 | if (ruid != (uid_t) -1) { |
a29c33f4 EB |
546 | new->uid = kruid; |
547 | if (!uid_eq(old->uid, kruid) && | |
548 | !uid_eq(old->euid, kruid) && | |
40852275 | 549 | !ns_capable_setid(old->user_ns, CAP_SETUID)) |
d84f4f99 | 550 | goto error; |
1da177e4 LT |
551 | } |
552 | ||
553 | if (euid != (uid_t) -1) { | |
a29c33f4 EB |
554 | new->euid = keuid; |
555 | if (!uid_eq(old->uid, keuid) && | |
556 | !uid_eq(old->euid, keuid) && | |
557 | !uid_eq(old->suid, keuid) && | |
40852275 | 558 | !ns_capable_setid(old->user_ns, CAP_SETUID)) |
d84f4f99 | 559 | goto error; |
1da177e4 LT |
560 | } |
561 | ||
a29c33f4 | 562 | if (!uid_eq(new->uid, old->uid)) { |
54e99124 DG |
563 | retval = set_user(new); |
564 | if (retval < 0) | |
565 | goto error; | |
566 | } | |
1da177e4 | 567 | if (ruid != (uid_t) -1 || |
a29c33f4 | 568 | (euid != (uid_t) -1 && !uid_eq(keuid, old->uid))) |
d84f4f99 DH |
569 | new->suid = new->euid; |
570 | new->fsuid = new->euid; | |
1da177e4 | 571 | |
d84f4f99 DH |
572 | retval = security_task_fix_setuid(new, old, LSM_SETID_RE); |
573 | if (retval < 0) | |
574 | goto error; | |
1da177e4 | 575 | |
905ae01c AG |
576 | retval = set_cred_ucounts(new); |
577 | if (retval < 0) | |
578 | goto error; | |
579 | ||
c923a8e7 | 580 | flag_nproc_exceeded(new); |
d84f4f99 | 581 | return commit_creds(new); |
1da177e4 | 582 | |
d84f4f99 DH |
583 | error: |
584 | abort_creds(new); | |
585 | return retval; | |
586 | } | |
ec94fc3d | 587 | |
e530dca5 DB |
588 | SYSCALL_DEFINE2(setreuid, uid_t, ruid, uid_t, euid) |
589 | { | |
590 | return __sys_setreuid(ruid, euid); | |
591 | } | |
592 | ||
1da177e4 | 593 | /* |
ec94fc3d | 594 | * setuid() is implemented like SysV with SAVED_IDS |
595 | * | |
1da177e4 | 596 | * Note that SAVED_ID's is deficient in that a setuid root program |
ec94fc3d | 597 | * like sendmail, for example, cannot set its uid to be a normal |
1da177e4 LT |
598 | * user and then switch back, because if you're root, setuid() sets |
599 | * the saved uid too. If you don't like this, blame the bright people | |
600 | * in the POSIX committee and/or USG. Note that the BSD-style setreuid() | |
601 | * will allow a root program to temporarily drop privileges and be able to | |
ec94fc3d | 602 | * regain them by swapping the real and effective uid. |
1da177e4 | 603 | */ |
e530dca5 | 604 | long __sys_setuid(uid_t uid) |
1da177e4 | 605 | { |
a29c33f4 | 606 | struct user_namespace *ns = current_user_ns(); |
d84f4f99 DH |
607 | const struct cred *old; |
608 | struct cred *new; | |
1da177e4 | 609 | int retval; |
a29c33f4 EB |
610 | kuid_t kuid; |
611 | ||
612 | kuid = make_kuid(ns, uid); | |
613 | if (!uid_valid(kuid)) | |
614 | return -EINVAL; | |
1da177e4 | 615 | |
d84f4f99 DH |
616 | new = prepare_creds(); |
617 | if (!new) | |
618 | return -ENOMEM; | |
619 | old = current_cred(); | |
620 | ||
d84f4f99 | 621 | retval = -EPERM; |
40852275 | 622 | if (ns_capable_setid(old->user_ns, CAP_SETUID)) { |
a29c33f4 EB |
623 | new->suid = new->uid = kuid; |
624 | if (!uid_eq(kuid, old->uid)) { | |
54e99124 DG |
625 | retval = set_user(new); |
626 | if (retval < 0) | |
627 | goto error; | |
d84f4f99 | 628 | } |
a29c33f4 | 629 | } else if (!uid_eq(kuid, old->uid) && !uid_eq(kuid, new->suid)) { |
d84f4f99 | 630 | goto error; |
1da177e4 | 631 | } |
1da177e4 | 632 | |
a29c33f4 | 633 | new->fsuid = new->euid = kuid; |
d84f4f99 DH |
634 | |
635 | retval = security_task_fix_setuid(new, old, LSM_SETID_ID); | |
636 | if (retval < 0) | |
637 | goto error; | |
1da177e4 | 638 | |
905ae01c AG |
639 | retval = set_cred_ucounts(new); |
640 | if (retval < 0) | |
641 | goto error; | |
642 | ||
c923a8e7 | 643 | flag_nproc_exceeded(new); |
d84f4f99 | 644 | return commit_creds(new); |
1da177e4 | 645 | |
d84f4f99 DH |
646 | error: |
647 | abort_creds(new); | |
648 | return retval; | |
1da177e4 LT |
649 | } |
650 | ||
e530dca5 DB |
651 | SYSCALL_DEFINE1(setuid, uid_t, uid) |
652 | { | |
653 | return __sys_setuid(uid); | |
654 | } | |
655 | ||
1da177e4 LT |
656 | |
657 | /* | |
658 | * This function implements a generic ability to update ruid, euid, | |
659 | * and suid. This allows you to implement the 4.4 compatible seteuid(). | |
660 | */ | |
e530dca5 | 661 | long __sys_setresuid(uid_t ruid, uid_t euid, uid_t suid) |
1da177e4 | 662 | { |
a29c33f4 | 663 | struct user_namespace *ns = current_user_ns(); |
d84f4f99 DH |
664 | const struct cred *old; |
665 | struct cred *new; | |
1da177e4 | 666 | int retval; |
a29c33f4 | 667 | kuid_t kruid, keuid, ksuid; |
659c0ce1 | 668 | bool ruid_new, euid_new, suid_new; |
a29c33f4 EB |
669 | |
670 | kruid = make_kuid(ns, ruid); | |
671 | keuid = make_kuid(ns, euid); | |
672 | ksuid = make_kuid(ns, suid); | |
673 | ||
674 | if ((ruid != (uid_t) -1) && !uid_valid(kruid)) | |
675 | return -EINVAL; | |
676 | ||
677 | if ((euid != (uid_t) -1) && !uid_valid(keuid)) | |
678 | return -EINVAL; | |
679 | ||
680 | if ((suid != (uid_t) -1) && !uid_valid(ksuid)) | |
681 | return -EINVAL; | |
1da177e4 | 682 | |
659c0ce1 OM |
683 | old = current_cred(); |
684 | ||
685 | /* check for no-op */ | |
686 | if ((ruid == (uid_t) -1 || uid_eq(kruid, old->uid)) && | |
687 | (euid == (uid_t) -1 || (uid_eq(keuid, old->euid) && | |
688 | uid_eq(keuid, old->fsuid))) && | |
689 | (suid == (uid_t) -1 || uid_eq(ksuid, old->suid))) | |
690 | return 0; | |
691 | ||
692 | ruid_new = ruid != (uid_t) -1 && !uid_eq(kruid, old->uid) && | |
693 | !uid_eq(kruid, old->euid) && !uid_eq(kruid, old->suid); | |
694 | euid_new = euid != (uid_t) -1 && !uid_eq(keuid, old->uid) && | |
695 | !uid_eq(keuid, old->euid) && !uid_eq(keuid, old->suid); | |
696 | suid_new = suid != (uid_t) -1 && !uid_eq(ksuid, old->uid) && | |
697 | !uid_eq(ksuid, old->euid) && !uid_eq(ksuid, old->suid); | |
698 | if ((ruid_new || euid_new || suid_new) && | |
699 | !ns_capable_setid(old->user_ns, CAP_SETUID)) | |
700 | return -EPERM; | |
701 | ||
d84f4f99 DH |
702 | new = prepare_creds(); |
703 | if (!new) | |
704 | return -ENOMEM; | |
705 | ||
1da177e4 | 706 | if (ruid != (uid_t) -1) { |
a29c33f4 EB |
707 | new->uid = kruid; |
708 | if (!uid_eq(kruid, old->uid)) { | |
54e99124 DG |
709 | retval = set_user(new); |
710 | if (retval < 0) | |
711 | goto error; | |
712 | } | |
1da177e4 | 713 | } |
d84f4f99 | 714 | if (euid != (uid_t) -1) |
a29c33f4 | 715 | new->euid = keuid; |
1da177e4 | 716 | if (suid != (uid_t) -1) |
a29c33f4 | 717 | new->suid = ksuid; |
d84f4f99 | 718 | new->fsuid = new->euid; |
1da177e4 | 719 | |
d84f4f99 DH |
720 | retval = security_task_fix_setuid(new, old, LSM_SETID_RES); |
721 | if (retval < 0) | |
722 | goto error; | |
1da177e4 | 723 | |
905ae01c AG |
724 | retval = set_cred_ucounts(new); |
725 | if (retval < 0) | |
726 | goto error; | |
727 | ||
c923a8e7 | 728 | flag_nproc_exceeded(new); |
d84f4f99 | 729 | return commit_creds(new); |
1da177e4 | 730 | |
d84f4f99 DH |
731 | error: |
732 | abort_creds(new); | |
733 | return retval; | |
1da177e4 LT |
734 | } |
735 | ||
e530dca5 DB |
736 | SYSCALL_DEFINE3(setresuid, uid_t, ruid, uid_t, euid, uid_t, suid) |
737 | { | |
738 | return __sys_setresuid(ruid, euid, suid); | |
739 | } | |
740 | ||
a29c33f4 | 741 | SYSCALL_DEFINE3(getresuid, uid_t __user *, ruidp, uid_t __user *, euidp, uid_t __user *, suidp) |
1da177e4 | 742 | { |
86a264ab | 743 | const struct cred *cred = current_cred(); |
1da177e4 | 744 | int retval; |
a29c33f4 EB |
745 | uid_t ruid, euid, suid; |
746 | ||
747 | ruid = from_kuid_munged(cred->user_ns, cred->uid); | |
748 | euid = from_kuid_munged(cred->user_ns, cred->euid); | |
749 | suid = from_kuid_munged(cred->user_ns, cred->suid); | |
1da177e4 | 750 | |
ec94fc3d | 751 | retval = put_user(ruid, ruidp); |
752 | if (!retval) { | |
753 | retval = put_user(euid, euidp); | |
754 | if (!retval) | |
755 | return put_user(suid, suidp); | |
756 | } | |
1da177e4 LT |
757 | return retval; |
758 | } | |
759 | ||
760 | /* | |
761 | * Same as above, but for rgid, egid, sgid. | |
762 | */ | |
e530dca5 | 763 | long __sys_setresgid(gid_t rgid, gid_t egid, gid_t sgid) |
1da177e4 | 764 | { |
a29c33f4 | 765 | struct user_namespace *ns = current_user_ns(); |
d84f4f99 DH |
766 | const struct cred *old; |
767 | struct cred *new; | |
1da177e4 | 768 | int retval; |
a29c33f4 | 769 | kgid_t krgid, kegid, ksgid; |
659c0ce1 | 770 | bool rgid_new, egid_new, sgid_new; |
a29c33f4 EB |
771 | |
772 | krgid = make_kgid(ns, rgid); | |
773 | kegid = make_kgid(ns, egid); | |
774 | ksgid = make_kgid(ns, sgid); | |
775 | ||
776 | if ((rgid != (gid_t) -1) && !gid_valid(krgid)) | |
777 | return -EINVAL; | |
778 | if ((egid != (gid_t) -1) && !gid_valid(kegid)) | |
779 | return -EINVAL; | |
780 | if ((sgid != (gid_t) -1) && !gid_valid(ksgid)) | |
781 | return -EINVAL; | |
1da177e4 | 782 | |
659c0ce1 OM |
783 | old = current_cred(); |
784 | ||
785 | /* check for no-op */ | |
786 | if ((rgid == (gid_t) -1 || gid_eq(krgid, old->gid)) && | |
787 | (egid == (gid_t) -1 || (gid_eq(kegid, old->egid) && | |
788 | gid_eq(kegid, old->fsgid))) && | |
789 | (sgid == (gid_t) -1 || gid_eq(ksgid, old->sgid))) | |
790 | return 0; | |
791 | ||
792 | rgid_new = rgid != (gid_t) -1 && !gid_eq(krgid, old->gid) && | |
793 | !gid_eq(krgid, old->egid) && !gid_eq(krgid, old->sgid); | |
794 | egid_new = egid != (gid_t) -1 && !gid_eq(kegid, old->gid) && | |
795 | !gid_eq(kegid, old->egid) && !gid_eq(kegid, old->sgid); | |
796 | sgid_new = sgid != (gid_t) -1 && !gid_eq(ksgid, old->gid) && | |
797 | !gid_eq(ksgid, old->egid) && !gid_eq(ksgid, old->sgid); | |
798 | if ((rgid_new || egid_new || sgid_new) && | |
799 | !ns_capable_setid(old->user_ns, CAP_SETGID)) | |
800 | return -EPERM; | |
801 | ||
d84f4f99 DH |
802 | new = prepare_creds(); |
803 | if (!new) | |
804 | return -ENOMEM; | |
d84f4f99 | 805 | |
1da177e4 | 806 | if (rgid != (gid_t) -1) |
a29c33f4 | 807 | new->gid = krgid; |
d84f4f99 | 808 | if (egid != (gid_t) -1) |
a29c33f4 | 809 | new->egid = kegid; |
1da177e4 | 810 | if (sgid != (gid_t) -1) |
a29c33f4 | 811 | new->sgid = ksgid; |
d84f4f99 | 812 | new->fsgid = new->egid; |
1da177e4 | 813 | |
39030e13 TC |
814 | retval = security_task_fix_setgid(new, old, LSM_SETID_RES); |
815 | if (retval < 0) | |
816 | goto error; | |
817 | ||
d84f4f99 DH |
818 | return commit_creds(new); |
819 | ||
820 | error: | |
821 | abort_creds(new); | |
822 | return retval; | |
1da177e4 LT |
823 | } |
824 | ||
e530dca5 DB |
825 | SYSCALL_DEFINE3(setresgid, gid_t, rgid, gid_t, egid, gid_t, sgid) |
826 | { | |
827 | return __sys_setresgid(rgid, egid, sgid); | |
828 | } | |
829 | ||
a29c33f4 | 830 | SYSCALL_DEFINE3(getresgid, gid_t __user *, rgidp, gid_t __user *, egidp, gid_t __user *, sgidp) |
1da177e4 | 831 | { |
86a264ab | 832 | const struct cred *cred = current_cred(); |
1da177e4 | 833 | int retval; |
a29c33f4 EB |
834 | gid_t rgid, egid, sgid; |
835 | ||
836 | rgid = from_kgid_munged(cred->user_ns, cred->gid); | |
837 | egid = from_kgid_munged(cred->user_ns, cred->egid); | |
838 | sgid = from_kgid_munged(cred->user_ns, cred->sgid); | |
1da177e4 | 839 | |
ec94fc3d | 840 | retval = put_user(rgid, rgidp); |
841 | if (!retval) { | |
842 | retval = put_user(egid, egidp); | |
843 | if (!retval) | |
844 | retval = put_user(sgid, sgidp); | |
845 | } | |
1da177e4 LT |
846 | |
847 | return retval; | |
848 | } | |
849 | ||
850 | ||
851 | /* | |
852 | * "setfsuid()" sets the fsuid - the uid used for filesystem checks. This | |
853 | * is used for "access()" and for the NFS daemon (letting nfsd stay at | |
854 | * whatever uid it wants to). It normally shadows "euid", except when | |
855 | * explicitly set by setfsuid() or for access.. | |
856 | */ | |
e530dca5 | 857 | long __sys_setfsuid(uid_t uid) |
1da177e4 | 858 | { |
d84f4f99 DH |
859 | const struct cred *old; |
860 | struct cred *new; | |
861 | uid_t old_fsuid; | |
a29c33f4 EB |
862 | kuid_t kuid; |
863 | ||
864 | old = current_cred(); | |
865 | old_fsuid = from_kuid_munged(old->user_ns, old->fsuid); | |
866 | ||
867 | kuid = make_kuid(old->user_ns, uid); | |
868 | if (!uid_valid(kuid)) | |
869 | return old_fsuid; | |
1da177e4 | 870 | |
d84f4f99 DH |
871 | new = prepare_creds(); |
872 | if (!new) | |
a29c33f4 | 873 | return old_fsuid; |
1da177e4 | 874 | |
a29c33f4 EB |
875 | if (uid_eq(kuid, old->uid) || uid_eq(kuid, old->euid) || |
876 | uid_eq(kuid, old->suid) || uid_eq(kuid, old->fsuid) || | |
40852275 | 877 | ns_capable_setid(old->user_ns, CAP_SETUID)) { |
a29c33f4 EB |
878 | if (!uid_eq(kuid, old->fsuid)) { |
879 | new->fsuid = kuid; | |
d84f4f99 DH |
880 | if (security_task_fix_setuid(new, old, LSM_SETID_FS) == 0) |
881 | goto change_okay; | |
1da177e4 | 882 | } |
1da177e4 LT |
883 | } |
884 | ||
d84f4f99 DH |
885 | abort_creds(new); |
886 | return old_fsuid; | |
1da177e4 | 887 | |
d84f4f99 DH |
888 | change_okay: |
889 | commit_creds(new); | |
1da177e4 LT |
890 | return old_fsuid; |
891 | } | |
892 | ||
e530dca5 DB |
893 | SYSCALL_DEFINE1(setfsuid, uid_t, uid) |
894 | { | |
895 | return __sys_setfsuid(uid); | |
896 | } | |
897 | ||
1da177e4 | 898 | /* |
f42df9e6 | 899 | * Samma på svenska.. |
1da177e4 | 900 | */ |
e530dca5 | 901 | long __sys_setfsgid(gid_t gid) |
1da177e4 | 902 | { |
d84f4f99 DH |
903 | const struct cred *old; |
904 | struct cred *new; | |
905 | gid_t old_fsgid; | |
a29c33f4 EB |
906 | kgid_t kgid; |
907 | ||
908 | old = current_cred(); | |
909 | old_fsgid = from_kgid_munged(old->user_ns, old->fsgid); | |
910 | ||
911 | kgid = make_kgid(old->user_ns, gid); | |
912 | if (!gid_valid(kgid)) | |
913 | return old_fsgid; | |
d84f4f99 DH |
914 | |
915 | new = prepare_creds(); | |
916 | if (!new) | |
a29c33f4 | 917 | return old_fsgid; |
1da177e4 | 918 | |
a29c33f4 EB |
919 | if (gid_eq(kgid, old->gid) || gid_eq(kgid, old->egid) || |
920 | gid_eq(kgid, old->sgid) || gid_eq(kgid, old->fsgid) || | |
111767c1 | 921 | ns_capable_setid(old->user_ns, CAP_SETGID)) { |
a29c33f4 EB |
922 | if (!gid_eq(kgid, old->fsgid)) { |
923 | new->fsgid = kgid; | |
39030e13 TC |
924 | if (security_task_fix_setgid(new,old,LSM_SETID_FS) == 0) |
925 | goto change_okay; | |
1da177e4 | 926 | } |
1da177e4 | 927 | } |
d84f4f99 | 928 | |
d84f4f99 DH |
929 | abort_creds(new); |
930 | return old_fsgid; | |
931 | ||
932 | change_okay: | |
933 | commit_creds(new); | |
1da177e4 LT |
934 | return old_fsgid; |
935 | } | |
e530dca5 DB |
936 | |
937 | SYSCALL_DEFINE1(setfsgid, gid_t, gid) | |
938 | { | |
939 | return __sys_setfsgid(gid); | |
940 | } | |
2813893f | 941 | #endif /* CONFIG_MULTIUSER */ |
1da177e4 | 942 | |
4a22f166 SR |
943 | /** |
944 | * sys_getpid - return the thread group id of the current process | |
945 | * | |
946 | * Note, despite the name, this returns the tgid not the pid. The tgid and | |
947 | * the pid are identical unless CLONE_THREAD was specified on clone() in | |
948 | * which case the tgid is the same in all threads of the same group. | |
949 | * | |
950 | * This is SMP safe as current->tgid does not change. | |
951 | */ | |
952 | SYSCALL_DEFINE0(getpid) | |
953 | { | |
954 | return task_tgid_vnr(current); | |
955 | } | |
956 | ||
957 | /* Thread ID - the internal kernel "pid" */ | |
958 | SYSCALL_DEFINE0(gettid) | |
959 | { | |
960 | return task_pid_vnr(current); | |
961 | } | |
962 | ||
963 | /* | |
964 | * Accessing ->real_parent is not SMP-safe, it could | |
965 | * change from under us. However, we can use a stale | |
966 | * value of ->real_parent under rcu_read_lock(), see | |
967 | * release_task()->call_rcu(delayed_put_task_struct). | |
968 | */ | |
969 | SYSCALL_DEFINE0(getppid) | |
970 | { | |
971 | int pid; | |
972 | ||
973 | rcu_read_lock(); | |
974 | pid = task_tgid_vnr(rcu_dereference(current->real_parent)); | |
975 | rcu_read_unlock(); | |
976 | ||
977 | return pid; | |
978 | } | |
979 | ||
980 | SYSCALL_DEFINE0(getuid) | |
981 | { | |
982 | /* Only we change this so SMP safe */ | |
983 | return from_kuid_munged(current_user_ns(), current_uid()); | |
984 | } | |
985 | ||
986 | SYSCALL_DEFINE0(geteuid) | |
987 | { | |
988 | /* Only we change this so SMP safe */ | |
989 | return from_kuid_munged(current_user_ns(), current_euid()); | |
990 | } | |
991 | ||
992 | SYSCALL_DEFINE0(getgid) | |
993 | { | |
994 | /* Only we change this so SMP safe */ | |
995 | return from_kgid_munged(current_user_ns(), current_gid()); | |
996 | } | |
997 | ||
998 | SYSCALL_DEFINE0(getegid) | |
999 | { | |
1000 | /* Only we change this so SMP safe */ | |
1001 | return from_kgid_munged(current_user_ns(), current_egid()); | |
1002 | } | |
1003 | ||
ca2406ed | 1004 | static void do_sys_times(struct tms *tms) |
f06febc9 | 1005 | { |
5613fda9 | 1006 | u64 tgutime, tgstime, cutime, cstime; |
f06febc9 | 1007 | |
e80d0a1a | 1008 | thread_group_cputime_adjusted(current, &tgutime, &tgstime); |
f06febc9 FM |
1009 | cutime = current->signal->cutime; |
1010 | cstime = current->signal->cstime; | |
5613fda9 FW |
1011 | tms->tms_utime = nsec_to_clock_t(tgutime); |
1012 | tms->tms_stime = nsec_to_clock_t(tgstime); | |
1013 | tms->tms_cutime = nsec_to_clock_t(cutime); | |
1014 | tms->tms_cstime = nsec_to_clock_t(cstime); | |
f06febc9 FM |
1015 | } |
1016 | ||
58fd3aa2 | 1017 | SYSCALL_DEFINE1(times, struct tms __user *, tbuf) |
1da177e4 | 1018 | { |
1da177e4 LT |
1019 | if (tbuf) { |
1020 | struct tms tmp; | |
f06febc9 FM |
1021 | |
1022 | do_sys_times(&tmp); | |
1da177e4 LT |
1023 | if (copy_to_user(tbuf, &tmp, sizeof(struct tms))) |
1024 | return -EFAULT; | |
1025 | } | |
e3d5a27d | 1026 | force_successful_syscall_return(); |
1da177e4 LT |
1027 | return (long) jiffies_64_to_clock_t(get_jiffies_64()); |
1028 | } | |
1029 | ||
ca2406ed AV |
1030 | #ifdef CONFIG_COMPAT |
1031 | static compat_clock_t clock_t_to_compat_clock_t(clock_t x) | |
1032 | { | |
1033 | return compat_jiffies_to_clock_t(clock_t_to_jiffies(x)); | |
1034 | } | |
1035 | ||
1036 | COMPAT_SYSCALL_DEFINE1(times, struct compat_tms __user *, tbuf) | |
1037 | { | |
1038 | if (tbuf) { | |
1039 | struct tms tms; | |
1040 | struct compat_tms tmp; | |
1041 | ||
1042 | do_sys_times(&tms); | |
1043 | /* Convert our struct tms to the compat version. */ | |
1044 | tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime); | |
1045 | tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime); | |
1046 | tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime); | |
1047 | tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime); | |
1048 | if (copy_to_user(tbuf, &tmp, sizeof(tmp))) | |
1049 | return -EFAULT; | |
1050 | } | |
1051 | force_successful_syscall_return(); | |
1052 | return compat_jiffies_to_clock_t(jiffies); | |
1053 | } | |
1054 | #endif | |
1055 | ||
1da177e4 LT |
1056 | /* |
1057 | * This needs some heavy checking ... | |
1058 | * I just haven't the stomach for it. I also don't fully | |
1059 | * understand sessions/pgrp etc. Let somebody who does explain it. | |
1060 | * | |
1061 | * OK, I think I have the protection semantics right.... this is really | |
1062 | * only important on a multi-user system anyway, to make sure one user | |
1063 | * can't send a signal to a process owned by another. -TYT, 12/12/91 | |
1064 | * | |
98611e4e | 1065 | * !PF_FORKNOEXEC check to conform completely to POSIX. |
1da177e4 | 1066 | */ |
b290ebe2 | 1067 | SYSCALL_DEFINE2(setpgid, pid_t, pid, pid_t, pgid) |
1da177e4 LT |
1068 | { |
1069 | struct task_struct *p; | |
ee0acf90 | 1070 | struct task_struct *group_leader = current->group_leader; |
4e021306 ON |
1071 | struct pid *pgrp; |
1072 | int err; | |
1da177e4 LT |
1073 | |
1074 | if (!pid) | |
b488893a | 1075 | pid = task_pid_vnr(group_leader); |
1da177e4 LT |
1076 | if (!pgid) |
1077 | pgid = pid; | |
1078 | if (pgid < 0) | |
1079 | return -EINVAL; | |
950eaaca | 1080 | rcu_read_lock(); |
1da177e4 LT |
1081 | |
1082 | /* From this point forward we keep holding onto the tasklist lock | |
1083 | * so that our parent does not change from under us. -DaveM | |
1084 | */ | |
1085 | write_lock_irq(&tasklist_lock); | |
1086 | ||
1087 | err = -ESRCH; | |
4e021306 | 1088 | p = find_task_by_vpid(pid); |
1da177e4 LT |
1089 | if (!p) |
1090 | goto out; | |
1091 | ||
1092 | err = -EINVAL; | |
1093 | if (!thread_group_leader(p)) | |
1094 | goto out; | |
1095 | ||
4e021306 | 1096 | if (same_thread_group(p->real_parent, group_leader)) { |
1da177e4 | 1097 | err = -EPERM; |
41487c65 | 1098 | if (task_session(p) != task_session(group_leader)) |
1da177e4 LT |
1099 | goto out; |
1100 | err = -EACCES; | |
98611e4e | 1101 | if (!(p->flags & PF_FORKNOEXEC)) |
1da177e4 LT |
1102 | goto out; |
1103 | } else { | |
1104 | err = -ESRCH; | |
ee0acf90 | 1105 | if (p != group_leader) |
1da177e4 LT |
1106 | goto out; |
1107 | } | |
1108 | ||
1109 | err = -EPERM; | |
1110 | if (p->signal->leader) | |
1111 | goto out; | |
1112 | ||
4e021306 | 1113 | pgrp = task_pid(p); |
1da177e4 | 1114 | if (pgid != pid) { |
b488893a | 1115 | struct task_struct *g; |
1da177e4 | 1116 | |
4e021306 ON |
1117 | pgrp = find_vpid(pgid); |
1118 | g = pid_task(pgrp, PIDTYPE_PGID); | |
41487c65 | 1119 | if (!g || task_session(g) != task_session(group_leader)) |
f020bc46 | 1120 | goto out; |
1da177e4 LT |
1121 | } |
1122 | ||
1da177e4 LT |
1123 | err = security_task_setpgid(p, pgid); |
1124 | if (err) | |
1125 | goto out; | |
1126 | ||
1b0f7ffd | 1127 | if (task_pgrp(p) != pgrp) |
83beaf3c | 1128 | change_pid(p, PIDTYPE_PGID, pgrp); |
1da177e4 LT |
1129 | |
1130 | err = 0; | |
1131 | out: | |
1132 | /* All paths lead to here, thus we are safe. -DaveM */ | |
1133 | write_unlock_irq(&tasklist_lock); | |
950eaaca | 1134 | rcu_read_unlock(); |
1da177e4 LT |
1135 | return err; |
1136 | } | |
1137 | ||
192c5807 | 1138 | static int do_getpgid(pid_t pid) |
1da177e4 | 1139 | { |
12a3de0a ON |
1140 | struct task_struct *p; |
1141 | struct pid *grp; | |
1142 | int retval; | |
1143 | ||
1144 | rcu_read_lock(); | |
756184b7 | 1145 | if (!pid) |
12a3de0a | 1146 | grp = task_pgrp(current); |
756184b7 | 1147 | else { |
1da177e4 | 1148 | retval = -ESRCH; |
12a3de0a ON |
1149 | p = find_task_by_vpid(pid); |
1150 | if (!p) | |
1151 | goto out; | |
1152 | grp = task_pgrp(p); | |
1153 | if (!grp) | |
1154 | goto out; | |
1155 | ||
1156 | retval = security_task_getpgid(p); | |
1157 | if (retval) | |
1158 | goto out; | |
1da177e4 | 1159 | } |
12a3de0a ON |
1160 | retval = pid_vnr(grp); |
1161 | out: | |
1162 | rcu_read_unlock(); | |
1163 | return retval; | |
1da177e4 LT |
1164 | } |
1165 | ||
192c5807 DB |
1166 | SYSCALL_DEFINE1(getpgid, pid_t, pid) |
1167 | { | |
1168 | return do_getpgid(pid); | |
1169 | } | |
1170 | ||
1da177e4 LT |
1171 | #ifdef __ARCH_WANT_SYS_GETPGRP |
1172 | ||
dbf040d9 | 1173 | SYSCALL_DEFINE0(getpgrp) |
1da177e4 | 1174 | { |
192c5807 | 1175 | return do_getpgid(0); |
1da177e4 LT |
1176 | } |
1177 | ||
1178 | #endif | |
1179 | ||
dbf040d9 | 1180 | SYSCALL_DEFINE1(getsid, pid_t, pid) |
1da177e4 | 1181 | { |
1dd768c0 ON |
1182 | struct task_struct *p; |
1183 | struct pid *sid; | |
1184 | int retval; | |
1185 | ||
1186 | rcu_read_lock(); | |
756184b7 | 1187 | if (!pid) |
1dd768c0 | 1188 | sid = task_session(current); |
756184b7 | 1189 | else { |
1da177e4 | 1190 | retval = -ESRCH; |
1dd768c0 ON |
1191 | p = find_task_by_vpid(pid); |
1192 | if (!p) | |
1193 | goto out; | |
1194 | sid = task_session(p); | |
1195 | if (!sid) | |
1196 | goto out; | |
1197 | ||
1198 | retval = security_task_getsid(p); | |
1199 | if (retval) | |
1200 | goto out; | |
1da177e4 | 1201 | } |
1dd768c0 ON |
1202 | retval = pid_vnr(sid); |
1203 | out: | |
1204 | rcu_read_unlock(); | |
1205 | return retval; | |
1da177e4 LT |
1206 | } |
1207 | ||
81dabb46 ON |
1208 | static void set_special_pids(struct pid *pid) |
1209 | { | |
1210 | struct task_struct *curr = current->group_leader; | |
1211 | ||
1212 | if (task_session(curr) != pid) | |
1213 | change_pid(curr, PIDTYPE_SID, pid); | |
1214 | ||
1215 | if (task_pgrp(curr) != pid) | |
1216 | change_pid(curr, PIDTYPE_PGID, pid); | |
1217 | } | |
1218 | ||
e2aaa9f4 | 1219 | int ksys_setsid(void) |
1da177e4 | 1220 | { |
e19f247a | 1221 | struct task_struct *group_leader = current->group_leader; |
e4cc0a9c ON |
1222 | struct pid *sid = task_pid(group_leader); |
1223 | pid_t session = pid_vnr(sid); | |
1da177e4 LT |
1224 | int err = -EPERM; |
1225 | ||
1da177e4 | 1226 | write_lock_irq(&tasklist_lock); |
390e2ff0 EB |
1227 | /* Fail if I am already a session leader */ |
1228 | if (group_leader->signal->leader) | |
1229 | goto out; | |
1230 | ||
430c6231 ON |
1231 | /* Fail if a process group id already exists that equals the |
1232 | * proposed session id. | |
390e2ff0 | 1233 | */ |
6806aac6 | 1234 | if (pid_task(sid, PIDTYPE_PGID)) |
1da177e4 LT |
1235 | goto out; |
1236 | ||
e19f247a | 1237 | group_leader->signal->leader = 1; |
81dabb46 | 1238 | set_special_pids(sid); |
24ec839c | 1239 | |
9c9f4ded | 1240 | proc_clear_tty(group_leader); |
24ec839c | 1241 | |
e4cc0a9c | 1242 | err = session; |
1da177e4 LT |
1243 | out: |
1244 | write_unlock_irq(&tasklist_lock); | |
5091faa4 | 1245 | if (err > 0) { |
0d0df599 | 1246 | proc_sid_connector(group_leader); |
5091faa4 MG |
1247 | sched_autogroup_create_attach(group_leader); |
1248 | } | |
1da177e4 LT |
1249 | return err; |
1250 | } | |
1251 | ||
e2aaa9f4 DB |
1252 | SYSCALL_DEFINE0(setsid) |
1253 | { | |
1254 | return ksys_setsid(); | |
1255 | } | |
1256 | ||
1da177e4 LT |
1257 | DECLARE_RWSEM(uts_sem); |
1258 | ||
e28cbf22 CH |
1259 | #ifdef COMPAT_UTS_MACHINE |
1260 | #define override_architecture(name) \ | |
46da2766 | 1261 | (personality(current->personality) == PER_LINUX32 && \ |
e28cbf22 CH |
1262 | copy_to_user(name->machine, COMPAT_UTS_MACHINE, \ |
1263 | sizeof(COMPAT_UTS_MACHINE))) | |
1264 | #else | |
1265 | #define override_architecture(name) 0 | |
1266 | #endif | |
1267 | ||
be27425d AK |
1268 | /* |
1269 | * Work around broken programs that cannot handle "Linux 3.0". | |
1270 | * Instead we map 3.x to 2.6.40+x, so e.g. 3.0 would be 2.6.40 | |
b7285b42 JN |
1271 | * And we map 4.x and later versions to 2.6.60+x, so 4.0/5.0/6.0/... would be |
1272 | * 2.6.60. | |
be27425d | 1273 | */ |
2702b152 | 1274 | static int override_release(char __user *release, size_t len) |
be27425d AK |
1275 | { |
1276 | int ret = 0; | |
be27425d AK |
1277 | |
1278 | if (current->personality & UNAME26) { | |
2702b152 KC |
1279 | const char *rest = UTS_RELEASE; |
1280 | char buf[65] = { 0 }; | |
be27425d AK |
1281 | int ndots = 0; |
1282 | unsigned v; | |
2702b152 | 1283 | size_t copy; |
be27425d AK |
1284 | |
1285 | while (*rest) { | |
1286 | if (*rest == '.' && ++ndots >= 3) | |
1287 | break; | |
1288 | if (!isdigit(*rest) && *rest != '.') | |
1289 | break; | |
1290 | rest++; | |
1291 | } | |
88a68672 | 1292 | v = LINUX_VERSION_PATCHLEVEL + 60; |
31fd84b9 | 1293 | copy = clamp_t(size_t, len, 1, sizeof(buf)); |
2702b152 KC |
1294 | copy = scnprintf(buf, copy, "2.6.%u%s", v, rest); |
1295 | ret = copy_to_user(release, buf, copy + 1); | |
be27425d AK |
1296 | } |
1297 | return ret; | |
1298 | } | |
1299 | ||
e48fbb69 | 1300 | SYSCALL_DEFINE1(newuname, struct new_utsname __user *, name) |
1da177e4 | 1301 | { |
42a0cc34 | 1302 | struct new_utsname tmp; |
1da177e4 LT |
1303 | |
1304 | down_read(&uts_sem); | |
42a0cc34 | 1305 | memcpy(&tmp, utsname(), sizeof(tmp)); |
1da177e4 | 1306 | up_read(&uts_sem); |
42a0cc34 JH |
1307 | if (copy_to_user(name, &tmp, sizeof(tmp))) |
1308 | return -EFAULT; | |
e28cbf22 | 1309 | |
42a0cc34 JH |
1310 | if (override_release(name->release, sizeof(name->release))) |
1311 | return -EFAULT; | |
1312 | if (override_architecture(name)) | |
1313 | return -EFAULT; | |
1314 | return 0; | |
1da177e4 LT |
1315 | } |
1316 | ||
5cacdb4a CH |
1317 | #ifdef __ARCH_WANT_SYS_OLD_UNAME |
1318 | /* | |
1319 | * Old cruft | |
1320 | */ | |
1321 | SYSCALL_DEFINE1(uname, struct old_utsname __user *, name) | |
1322 | { | |
42a0cc34 | 1323 | struct old_utsname tmp; |
5cacdb4a CH |
1324 | |
1325 | if (!name) | |
1326 | return -EFAULT; | |
1327 | ||
1328 | down_read(&uts_sem); | |
42a0cc34 | 1329 | memcpy(&tmp, utsname(), sizeof(tmp)); |
5cacdb4a | 1330 | up_read(&uts_sem); |
42a0cc34 JH |
1331 | if (copy_to_user(name, &tmp, sizeof(tmp))) |
1332 | return -EFAULT; | |
5cacdb4a | 1333 | |
42a0cc34 JH |
1334 | if (override_release(name->release, sizeof(name->release))) |
1335 | return -EFAULT; | |
1336 | if (override_architecture(name)) | |
1337 | return -EFAULT; | |
1338 | return 0; | |
5cacdb4a CH |
1339 | } |
1340 | ||
1341 | SYSCALL_DEFINE1(olduname, struct oldold_utsname __user *, name) | |
1342 | { | |
5e1aada0 | 1343 | struct oldold_utsname tmp; |
5cacdb4a CH |
1344 | |
1345 | if (!name) | |
1346 | return -EFAULT; | |
5cacdb4a | 1347 | |
5e1aada0 JP |
1348 | memset(&tmp, 0, sizeof(tmp)); |
1349 | ||
5cacdb4a | 1350 | down_read(&uts_sem); |
42a0cc34 JH |
1351 | memcpy(&tmp.sysname, &utsname()->sysname, __OLD_UTS_LEN); |
1352 | memcpy(&tmp.nodename, &utsname()->nodename, __OLD_UTS_LEN); | |
1353 | memcpy(&tmp.release, &utsname()->release, __OLD_UTS_LEN); | |
1354 | memcpy(&tmp.version, &utsname()->version, __OLD_UTS_LEN); | |
1355 | memcpy(&tmp.machine, &utsname()->machine, __OLD_UTS_LEN); | |
5cacdb4a | 1356 | up_read(&uts_sem); |
42a0cc34 JH |
1357 | if (copy_to_user(name, &tmp, sizeof(tmp))) |
1358 | return -EFAULT; | |
5cacdb4a | 1359 | |
42a0cc34 JH |
1360 | if (override_architecture(name)) |
1361 | return -EFAULT; | |
1362 | if (override_release(name->release, sizeof(name->release))) | |
1363 | return -EFAULT; | |
1364 | return 0; | |
5cacdb4a CH |
1365 | } |
1366 | #endif | |
1367 | ||
5a8a82b1 | 1368 | SYSCALL_DEFINE2(sethostname, char __user *, name, int, len) |
1da177e4 LT |
1369 | { |
1370 | int errno; | |
1371 | char tmp[__NEW_UTS_LEN]; | |
1372 | ||
bb96a6f5 | 1373 | if (!ns_capable(current->nsproxy->uts_ns->user_ns, CAP_SYS_ADMIN)) |
1da177e4 | 1374 | return -EPERM; |
fc832ad3 | 1375 | |
1da177e4 LT |
1376 | if (len < 0 || len > __NEW_UTS_LEN) |
1377 | return -EINVAL; | |
1da177e4 LT |
1378 | errno = -EFAULT; |
1379 | if (!copy_from_user(tmp, name, len)) { | |
42a0cc34 | 1380 | struct new_utsname *u; |
9679e4dd | 1381 | |
37608ba3 | 1382 | add_device_randomness(tmp, len); |
42a0cc34 JH |
1383 | down_write(&uts_sem); |
1384 | u = utsname(); | |
9679e4dd AM |
1385 | memcpy(u->nodename, tmp, len); |
1386 | memset(u->nodename + len, 0, sizeof(u->nodename) - len); | |
1da177e4 | 1387 | errno = 0; |
499eea6b | 1388 | uts_proc_notify(UTS_PROC_HOSTNAME); |
42a0cc34 | 1389 | up_write(&uts_sem); |
1da177e4 | 1390 | } |
1da177e4 LT |
1391 | return errno; |
1392 | } | |
1393 | ||
1394 | #ifdef __ARCH_WANT_SYS_GETHOSTNAME | |
1395 | ||
5a8a82b1 | 1396 | SYSCALL_DEFINE2(gethostname, char __user *, name, int, len) |
1da177e4 | 1397 | { |
42a0cc34 | 1398 | int i; |
9679e4dd | 1399 | struct new_utsname *u; |
42a0cc34 | 1400 | char tmp[__NEW_UTS_LEN + 1]; |
1da177e4 LT |
1401 | |
1402 | if (len < 0) | |
1403 | return -EINVAL; | |
1404 | down_read(&uts_sem); | |
9679e4dd AM |
1405 | u = utsname(); |
1406 | i = 1 + strlen(u->nodename); | |
1da177e4 LT |
1407 | if (i > len) |
1408 | i = len; | |
42a0cc34 | 1409 | memcpy(tmp, u->nodename, i); |
1da177e4 | 1410 | up_read(&uts_sem); |
42a0cc34 JH |
1411 | if (copy_to_user(name, tmp, i)) |
1412 | return -EFAULT; | |
1413 | return 0; | |
1da177e4 LT |
1414 | } |
1415 | ||
1416 | #endif | |
1417 | ||
1418 | /* | |
1419 | * Only setdomainname; getdomainname can be implemented by calling | |
1420 | * uname() | |
1421 | */ | |
5a8a82b1 | 1422 | SYSCALL_DEFINE2(setdomainname, char __user *, name, int, len) |
1da177e4 LT |
1423 | { |
1424 | int errno; | |
1425 | char tmp[__NEW_UTS_LEN]; | |
1426 | ||
fc832ad3 | 1427 | if (!ns_capable(current->nsproxy->uts_ns->user_ns, CAP_SYS_ADMIN)) |
1da177e4 LT |
1428 | return -EPERM; |
1429 | if (len < 0 || len > __NEW_UTS_LEN) | |
1430 | return -EINVAL; | |
1431 | ||
1da177e4 LT |
1432 | errno = -EFAULT; |
1433 | if (!copy_from_user(tmp, name, len)) { | |
42a0cc34 | 1434 | struct new_utsname *u; |
9679e4dd | 1435 | |
37608ba3 | 1436 | add_device_randomness(tmp, len); |
42a0cc34 JH |
1437 | down_write(&uts_sem); |
1438 | u = utsname(); | |
9679e4dd AM |
1439 | memcpy(u->domainname, tmp, len); |
1440 | memset(u->domainname + len, 0, sizeof(u->domainname) - len); | |
1da177e4 | 1441 | errno = 0; |
499eea6b | 1442 | uts_proc_notify(UTS_PROC_DOMAINNAME); |
42a0cc34 | 1443 | up_write(&uts_sem); |
1da177e4 | 1444 | } |
1da177e4 LT |
1445 | return errno; |
1446 | } | |
1447 | ||
c57bef02 BR |
1448 | /* make sure you are allowed to change @tsk limits before calling this */ |
1449 | static int do_prlimit(struct task_struct *tsk, unsigned int resource, | |
1450 | struct rlimit *new_rlim, struct rlimit *old_rlim) | |
1451 | { | |
1452 | struct rlimit *rlim; | |
1453 | int retval = 0; | |
1454 | ||
1455 | if (resource >= RLIM_NLIMITS) | |
1456 | return -EINVAL; | |
73979060 GKH |
1457 | resource = array_index_nospec(resource, RLIM_NLIMITS); |
1458 | ||
c57bef02 BR |
1459 | if (new_rlim) { |
1460 | if (new_rlim->rlim_cur > new_rlim->rlim_max) | |
1461 | return -EINVAL; | |
1462 | if (resource == RLIMIT_NOFILE && | |
1463 | new_rlim->rlim_max > sysctl_nr_open) | |
1464 | return -EPERM; | |
1465 | } | |
1466 | ||
18c91bb2 | 1467 | /* Holding a refcount on tsk protects tsk->signal from disappearing. */ |
c57bef02 BR |
1468 | rlim = tsk->signal->rlim + resource; |
1469 | task_lock(tsk->group_leader); | |
1470 | if (new_rlim) { | |
1471 | /* | |
1472 | * Keep the capable check against init_user_ns until cgroups can | |
1473 | * contain all limits. | |
1474 | */ | |
1475 | if (new_rlim->rlim_max > rlim->rlim_max && | |
1476 | !capable(CAP_SYS_RESOURCE)) | |
1477 | retval = -EPERM; | |
1478 | if (!retval) | |
1479 | retval = security_task_setrlimit(tsk, resource, new_rlim); | |
1480 | } | |
1481 | if (!retval) { | |
1482 | if (old_rlim) | |
1483 | *old_rlim = *rlim; | |
1484 | if (new_rlim) | |
1485 | *rlim = *new_rlim; | |
1486 | } | |
1487 | task_unlock(tsk->group_leader); | |
1488 | ||
1489 | /* | |
1490 | * RLIMIT_CPU handling. Arm the posix CPU timer if the limit is not | |
1491 | * infinite. In case of RLIM_INFINITY the posix CPU timer code | |
1492 | * ignores the rlimit. | |
1493 | */ | |
1494 | if (!retval && new_rlim && resource == RLIMIT_CPU && | |
1495 | new_rlim->rlim_cur != RLIM_INFINITY && | |
18c91bb2 BR |
1496 | IS_ENABLED(CONFIG_POSIX_TIMERS)) { |
1497 | /* | |
1498 | * update_rlimit_cpu can fail if the task is exiting, but there | |
1499 | * may be other tasks in the thread group that are not exiting, | |
1500 | * and they need their cpu timers adjusted. | |
1501 | * | |
1502 | * The group_leader is the last task to be released, so if we | |
1503 | * cannot update_rlimit_cpu on it, then the entire process is | |
1504 | * exiting and we do not need to update at all. | |
1505 | */ | |
1506 | update_rlimit_cpu(tsk->group_leader, new_rlim->rlim_cur); | |
1507 | } | |
1508 | ||
c57bef02 BR |
1509 | return retval; |
1510 | } | |
1511 | ||
e48fbb69 | 1512 | SYSCALL_DEFINE2(getrlimit, unsigned int, resource, struct rlimit __user *, rlim) |
1da177e4 | 1513 | { |
b9518345 JS |
1514 | struct rlimit value; |
1515 | int ret; | |
1516 | ||
1517 | ret = do_prlimit(current, resource, NULL, &value); | |
1518 | if (!ret) | |
1519 | ret = copy_to_user(rlim, &value, sizeof(*rlim)) ? -EFAULT : 0; | |
1520 | ||
1521 | return ret; | |
1da177e4 LT |
1522 | } |
1523 | ||
d9e968cb AV |
1524 | #ifdef CONFIG_COMPAT |
1525 | ||
1526 | COMPAT_SYSCALL_DEFINE2(setrlimit, unsigned int, resource, | |
1527 | struct compat_rlimit __user *, rlim) | |
1528 | { | |
1529 | struct rlimit r; | |
1530 | struct compat_rlimit r32; | |
1531 | ||
1532 | if (copy_from_user(&r32, rlim, sizeof(struct compat_rlimit))) | |
1533 | return -EFAULT; | |
1534 | ||
1535 | if (r32.rlim_cur == COMPAT_RLIM_INFINITY) | |
1536 | r.rlim_cur = RLIM_INFINITY; | |
1537 | else | |
1538 | r.rlim_cur = r32.rlim_cur; | |
1539 | if (r32.rlim_max == COMPAT_RLIM_INFINITY) | |
1540 | r.rlim_max = RLIM_INFINITY; | |
1541 | else | |
1542 | r.rlim_max = r32.rlim_max; | |
1543 | return do_prlimit(current, resource, &r, NULL); | |
1544 | } | |
1545 | ||
1546 | COMPAT_SYSCALL_DEFINE2(getrlimit, unsigned int, resource, | |
1547 | struct compat_rlimit __user *, rlim) | |
1548 | { | |
1549 | struct rlimit r; | |
1550 | int ret; | |
1551 | ||
1552 | ret = do_prlimit(current, resource, NULL, &r); | |
1553 | if (!ret) { | |
58c7ffc0 | 1554 | struct compat_rlimit r32; |
d9e968cb AV |
1555 | if (r.rlim_cur > COMPAT_RLIM_INFINITY) |
1556 | r32.rlim_cur = COMPAT_RLIM_INFINITY; | |
1557 | else | |
1558 | r32.rlim_cur = r.rlim_cur; | |
1559 | if (r.rlim_max > COMPAT_RLIM_INFINITY) | |
1560 | r32.rlim_max = COMPAT_RLIM_INFINITY; | |
1561 | else | |
1562 | r32.rlim_max = r.rlim_max; | |
1563 | ||
1564 | if (copy_to_user(rlim, &r32, sizeof(struct compat_rlimit))) | |
1565 | return -EFAULT; | |
1566 | } | |
1567 | return ret; | |
1568 | } | |
1569 | ||
1570 | #endif | |
1571 | ||
1da177e4 LT |
1572 | #ifdef __ARCH_WANT_SYS_OLD_GETRLIMIT |
1573 | ||
1574 | /* | |
1575 | * Back compatibility for getrlimit. Needed for some apps. | |
1576 | */ | |
e48fbb69 HC |
1577 | SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource, |
1578 | struct rlimit __user *, rlim) | |
1da177e4 LT |
1579 | { |
1580 | struct rlimit x; | |
1581 | if (resource >= RLIM_NLIMITS) | |
1582 | return -EINVAL; | |
1583 | ||
23d6aef7 | 1584 | resource = array_index_nospec(resource, RLIM_NLIMITS); |
1da177e4 LT |
1585 | task_lock(current->group_leader); |
1586 | x = current->signal->rlim[resource]; | |
1587 | task_unlock(current->group_leader); | |
756184b7 | 1588 | if (x.rlim_cur > 0x7FFFFFFF) |
1da177e4 | 1589 | x.rlim_cur = 0x7FFFFFFF; |
756184b7 | 1590 | if (x.rlim_max > 0x7FFFFFFF) |
1da177e4 | 1591 | x.rlim_max = 0x7FFFFFFF; |
ec94fc3d | 1592 | return copy_to_user(rlim, &x, sizeof(x)) ? -EFAULT : 0; |
1da177e4 LT |
1593 | } |
1594 | ||
613763a1 AV |
1595 | #ifdef CONFIG_COMPAT |
1596 | COMPAT_SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource, | |
1597 | struct compat_rlimit __user *, rlim) | |
1598 | { | |
1599 | struct rlimit r; | |
1600 | ||
1601 | if (resource >= RLIM_NLIMITS) | |
1602 | return -EINVAL; | |
1603 | ||
23d6aef7 | 1604 | resource = array_index_nospec(resource, RLIM_NLIMITS); |
613763a1 AV |
1605 | task_lock(current->group_leader); |
1606 | r = current->signal->rlim[resource]; | |
1607 | task_unlock(current->group_leader); | |
1608 | if (r.rlim_cur > 0x7FFFFFFF) | |
1609 | r.rlim_cur = 0x7FFFFFFF; | |
1610 | if (r.rlim_max > 0x7FFFFFFF) | |
1611 | r.rlim_max = 0x7FFFFFFF; | |
1612 | ||
1613 | if (put_user(r.rlim_cur, &rlim->rlim_cur) || | |
1614 | put_user(r.rlim_max, &rlim->rlim_max)) | |
1615 | return -EFAULT; | |
1616 | return 0; | |
1617 | } | |
1618 | #endif | |
1619 | ||
1da177e4 LT |
1620 | #endif |
1621 | ||
c022a0ac JS |
1622 | static inline bool rlim64_is_infinity(__u64 rlim64) |
1623 | { | |
1624 | #if BITS_PER_LONG < 64 | |
1625 | return rlim64 >= ULONG_MAX; | |
1626 | #else | |
1627 | return rlim64 == RLIM64_INFINITY; | |
1628 | #endif | |
1629 | } | |
1630 | ||
1631 | static void rlim_to_rlim64(const struct rlimit *rlim, struct rlimit64 *rlim64) | |
1632 | { | |
1633 | if (rlim->rlim_cur == RLIM_INFINITY) | |
1634 | rlim64->rlim_cur = RLIM64_INFINITY; | |
1635 | else | |
1636 | rlim64->rlim_cur = rlim->rlim_cur; | |
1637 | if (rlim->rlim_max == RLIM_INFINITY) | |
1638 | rlim64->rlim_max = RLIM64_INFINITY; | |
1639 | else | |
1640 | rlim64->rlim_max = rlim->rlim_max; | |
1641 | } | |
1642 | ||
1643 | static void rlim64_to_rlim(const struct rlimit64 *rlim64, struct rlimit *rlim) | |
1644 | { | |
1645 | if (rlim64_is_infinity(rlim64->rlim_cur)) | |
1646 | rlim->rlim_cur = RLIM_INFINITY; | |
1647 | else | |
1648 | rlim->rlim_cur = (unsigned long)rlim64->rlim_cur; | |
1649 | if (rlim64_is_infinity(rlim64->rlim_max)) | |
1650 | rlim->rlim_max = RLIM_INFINITY; | |
1651 | else | |
1652 | rlim->rlim_max = (unsigned long)rlim64->rlim_max; | |
1653 | } | |
1654 | ||
c022a0ac | 1655 | /* rcu lock must be held */ |
791ec491 SS |
1656 | static int check_prlimit_permission(struct task_struct *task, |
1657 | unsigned int flags) | |
c022a0ac JS |
1658 | { |
1659 | const struct cred *cred = current_cred(), *tcred; | |
791ec491 | 1660 | bool id_match; |
c022a0ac | 1661 | |
fc832ad3 SH |
1662 | if (current == task) |
1663 | return 0; | |
c022a0ac | 1664 | |
fc832ad3 | 1665 | tcred = __task_cred(task); |
791ec491 SS |
1666 | id_match = (uid_eq(cred->uid, tcred->euid) && |
1667 | uid_eq(cred->uid, tcred->suid) && | |
1668 | uid_eq(cred->uid, tcred->uid) && | |
1669 | gid_eq(cred->gid, tcred->egid) && | |
1670 | gid_eq(cred->gid, tcred->sgid) && | |
1671 | gid_eq(cred->gid, tcred->gid)); | |
1672 | if (!id_match && !ns_capable(tcred->user_ns, CAP_SYS_RESOURCE)) | |
1673 | return -EPERM; | |
fc832ad3 | 1674 | |
791ec491 | 1675 | return security_task_prlimit(cred, tcred, flags); |
c022a0ac JS |
1676 | } |
1677 | ||
1678 | SYSCALL_DEFINE4(prlimit64, pid_t, pid, unsigned int, resource, | |
1679 | const struct rlimit64 __user *, new_rlim, | |
1680 | struct rlimit64 __user *, old_rlim) | |
1681 | { | |
1682 | struct rlimit64 old64, new64; | |
1683 | struct rlimit old, new; | |
1684 | struct task_struct *tsk; | |
791ec491 | 1685 | unsigned int checkflags = 0; |
c022a0ac JS |
1686 | int ret; |
1687 | ||
791ec491 SS |
1688 | if (old_rlim) |
1689 | checkflags |= LSM_PRLIMIT_READ; | |
1690 | ||
c022a0ac JS |
1691 | if (new_rlim) { |
1692 | if (copy_from_user(&new64, new_rlim, sizeof(new64))) | |
1693 | return -EFAULT; | |
1694 | rlim64_to_rlim(&new64, &new); | |
791ec491 | 1695 | checkflags |= LSM_PRLIMIT_WRITE; |
c022a0ac JS |
1696 | } |
1697 | ||
1698 | rcu_read_lock(); | |
1699 | tsk = pid ? find_task_by_vpid(pid) : current; | |
1700 | if (!tsk) { | |
1701 | rcu_read_unlock(); | |
1702 | return -ESRCH; | |
1703 | } | |
791ec491 | 1704 | ret = check_prlimit_permission(tsk, checkflags); |
c022a0ac JS |
1705 | if (ret) { |
1706 | rcu_read_unlock(); | |
1707 | return ret; | |
1708 | } | |
1709 | get_task_struct(tsk); | |
1710 | rcu_read_unlock(); | |
1711 | ||
1712 | ret = do_prlimit(tsk, resource, new_rlim ? &new : NULL, | |
1713 | old_rlim ? &old : NULL); | |
1714 | ||
1715 | if (!ret && old_rlim) { | |
1716 | rlim_to_rlim64(&old, &old64); | |
1717 | if (copy_to_user(old_rlim, &old64, sizeof(old64))) | |
1718 | ret = -EFAULT; | |
1719 | } | |
1720 | ||
1721 | put_task_struct(tsk); | |
1722 | return ret; | |
1723 | } | |
1724 | ||
7855c35d JS |
1725 | SYSCALL_DEFINE2(setrlimit, unsigned int, resource, struct rlimit __user *, rlim) |
1726 | { | |
1727 | struct rlimit new_rlim; | |
1728 | ||
1729 | if (copy_from_user(&new_rlim, rlim, sizeof(*rlim))) | |
1730 | return -EFAULT; | |
5b41535a | 1731 | return do_prlimit(current, resource, &new_rlim, NULL); |
7855c35d JS |
1732 | } |
1733 | ||
1da177e4 LT |
1734 | /* |
1735 | * It would make sense to put struct rusage in the task_struct, | |
1736 | * except that would make the task_struct be *really big*. After | |
1737 | * task_struct gets moved into malloc'ed memory, it would | |
1738 | * make sense to do this. It will make moving the rest of the information | |
1739 | * a lot simpler! (Which we're not doing right now because we're not | |
1740 | * measuring them yet). | |
1741 | * | |
1da177e4 LT |
1742 | * When sampling multiple threads for RUSAGE_SELF, under SMP we might have |
1743 | * races with threads incrementing their own counters. But since word | |
1744 | * reads are atomic, we either get new values or old values and we don't | |
1745 | * care which for the sums. We always take the siglock to protect reading | |
1746 | * the c* fields from p->signal from races with exit.c updating those | |
1747 | * fields when reaping, so a sample either gets all the additions of a | |
1748 | * given child after it's reaped, or none so this sample is before reaping. | |
2dd0ebcd | 1749 | * |
de047c1b RT |
1750 | * Locking: |
1751 | * We need to take the siglock for CHILDEREN, SELF and BOTH | |
1752 | * for the cases current multithreaded, non-current single threaded | |
1753 | * non-current multithreaded. Thread traversal is now safe with | |
1754 | * the siglock held. | |
1755 | * Strictly speaking, we donot need to take the siglock if we are current and | |
1756 | * single threaded, as no one else can take our signal_struct away, no one | |
1757 | * else can reap the children to update signal->c* counters, and no one else | |
1758 | * can race with the signal-> fields. If we do not take any lock, the | |
1759 | * signal-> fields could be read out of order while another thread was just | |
1760 | * exiting. So we should place a read memory barrier when we avoid the lock. | |
1761 | * On the writer side, write memory barrier is implied in __exit_signal | |
1762 | * as __exit_signal releases the siglock spinlock after updating the signal-> | |
1763 | * fields. But we don't do this yet to keep things simple. | |
2dd0ebcd | 1764 | * |
1da177e4 LT |
1765 | */ |
1766 | ||
f06febc9 | 1767 | static void accumulate_thread_rusage(struct task_struct *t, struct rusage *r) |
679c9cd4 | 1768 | { |
679c9cd4 SK |
1769 | r->ru_nvcsw += t->nvcsw; |
1770 | r->ru_nivcsw += t->nivcsw; | |
1771 | r->ru_minflt += t->min_flt; | |
1772 | r->ru_majflt += t->maj_flt; | |
1773 | r->ru_inblock += task_io_get_inblock(t); | |
1774 | r->ru_oublock += task_io_get_oublock(t); | |
1775 | } | |
1776 | ||
ce72a16f | 1777 | void getrusage(struct task_struct *p, int who, struct rusage *r) |
1da177e4 LT |
1778 | { |
1779 | struct task_struct *t; | |
1780 | unsigned long flags; | |
5613fda9 | 1781 | u64 tgutime, tgstime, utime, stime; |
1f10206c | 1782 | unsigned long maxrss = 0; |
1da177e4 | 1783 | |
ec94fc3d | 1784 | memset((char *)r, 0, sizeof (*r)); |
64861634 | 1785 | utime = stime = 0; |
1da177e4 | 1786 | |
679c9cd4 | 1787 | if (who == RUSAGE_THREAD) { |
e80d0a1a | 1788 | task_cputime_adjusted(current, &utime, &stime); |
f06febc9 | 1789 | accumulate_thread_rusage(p, r); |
1f10206c | 1790 | maxrss = p->signal->maxrss; |
679c9cd4 SK |
1791 | goto out; |
1792 | } | |
1793 | ||
d6cf723a | 1794 | if (!lock_task_sighand(p, &flags)) |
de047c1b | 1795 | return; |
0f59cc4a | 1796 | |
1da177e4 | 1797 | switch (who) { |
ec94fc3d | 1798 | case RUSAGE_BOTH: |
1799 | case RUSAGE_CHILDREN: | |
1800 | utime = p->signal->cutime; | |
1801 | stime = p->signal->cstime; | |
1802 | r->ru_nvcsw = p->signal->cnvcsw; | |
1803 | r->ru_nivcsw = p->signal->cnivcsw; | |
1804 | r->ru_minflt = p->signal->cmin_flt; | |
1805 | r->ru_majflt = p->signal->cmaj_flt; | |
1806 | r->ru_inblock = p->signal->cinblock; | |
1807 | r->ru_oublock = p->signal->coublock; | |
1808 | maxrss = p->signal->cmaxrss; | |
1809 | ||
1810 | if (who == RUSAGE_CHILDREN) | |
1da177e4 | 1811 | break; |
df561f66 | 1812 | fallthrough; |
0f59cc4a | 1813 | |
ec94fc3d | 1814 | case RUSAGE_SELF: |
1815 | thread_group_cputime_adjusted(p, &tgutime, &tgstime); | |
1816 | utime += tgutime; | |
1817 | stime += tgstime; | |
1818 | r->ru_nvcsw += p->signal->nvcsw; | |
1819 | r->ru_nivcsw += p->signal->nivcsw; | |
1820 | r->ru_minflt += p->signal->min_flt; | |
1821 | r->ru_majflt += p->signal->maj_flt; | |
1822 | r->ru_inblock += p->signal->inblock; | |
1823 | r->ru_oublock += p->signal->oublock; | |
1824 | if (maxrss < p->signal->maxrss) | |
1825 | maxrss = p->signal->maxrss; | |
1826 | t = p; | |
1827 | do { | |
1828 | accumulate_thread_rusage(t, r); | |
1829 | } while_each_thread(p, t); | |
1830 | break; | |
1831 | ||
1832 | default: | |
1833 | BUG(); | |
1da177e4 | 1834 | } |
de047c1b | 1835 | unlock_task_sighand(p, &flags); |
de047c1b | 1836 | |
679c9cd4 | 1837 | out: |
bdd565f8 AB |
1838 | r->ru_utime = ns_to_kernel_old_timeval(utime); |
1839 | r->ru_stime = ns_to_kernel_old_timeval(stime); | |
1f10206c JP |
1840 | |
1841 | if (who != RUSAGE_CHILDREN) { | |
1842 | struct mm_struct *mm = get_task_mm(p); | |
ec94fc3d | 1843 | |
1f10206c JP |
1844 | if (mm) { |
1845 | setmax_mm_hiwater_rss(&maxrss, mm); | |
1846 | mmput(mm); | |
1847 | } | |
1848 | } | |
1849 | r->ru_maxrss = maxrss * (PAGE_SIZE / 1024); /* convert pages to KBs */ | |
1da177e4 LT |
1850 | } |
1851 | ||
ce72a16f | 1852 | SYSCALL_DEFINE2(getrusage, int, who, struct rusage __user *, ru) |
1da177e4 LT |
1853 | { |
1854 | struct rusage r; | |
ec94fc3d | 1855 | |
679c9cd4 SK |
1856 | if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN && |
1857 | who != RUSAGE_THREAD) | |
1da177e4 | 1858 | return -EINVAL; |
ce72a16f AV |
1859 | |
1860 | getrusage(current, who, &r); | |
1861 | return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0; | |
1da177e4 LT |
1862 | } |
1863 | ||
8d2d5c4a AV |
1864 | #ifdef CONFIG_COMPAT |
1865 | COMPAT_SYSCALL_DEFINE2(getrusage, int, who, struct compat_rusage __user *, ru) | |
1866 | { | |
1867 | struct rusage r; | |
1868 | ||
1869 | if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN && | |
1870 | who != RUSAGE_THREAD) | |
1871 | return -EINVAL; | |
1872 | ||
ce72a16f | 1873 | getrusage(current, who, &r); |
8d2d5c4a AV |
1874 | return put_compat_rusage(&r, ru); |
1875 | } | |
1876 | #endif | |
1877 | ||
e48fbb69 | 1878 | SYSCALL_DEFINE1(umask, int, mask) |
1da177e4 LT |
1879 | { |
1880 | mask = xchg(¤t->fs->umask, mask & S_IRWXUGO); | |
1881 | return mask; | |
1882 | } | |
3b7391de | 1883 | |
6e399cd1 | 1884 | static int prctl_set_mm_exe_file(struct mm_struct *mm, unsigned int fd) |
b32dfe37 | 1885 | { |
2903ff01 | 1886 | struct fd exe; |
496ad9aa | 1887 | struct inode *inode; |
2903ff01 | 1888 | int err; |
b32dfe37 | 1889 | |
2903ff01 AV |
1890 | exe = fdget(fd); |
1891 | if (!exe.file) | |
b32dfe37 CG |
1892 | return -EBADF; |
1893 | ||
496ad9aa | 1894 | inode = file_inode(exe.file); |
b32dfe37 CG |
1895 | |
1896 | /* | |
1897 | * Because the original mm->exe_file points to executable file, make | |
1898 | * sure that this one is executable as well, to avoid breaking an | |
1899 | * overall picture. | |
1900 | */ | |
1901 | err = -EACCES; | |
90f8572b | 1902 | if (!S_ISREG(inode->i_mode) || path_noexec(&exe.file->f_path)) |
b32dfe37 CG |
1903 | goto exit; |
1904 | ||
02f92b38 | 1905 | err = file_permission(exe.file, MAY_EXEC); |
b32dfe37 CG |
1906 | if (err) |
1907 | goto exit; | |
1908 | ||
35d7bdc8 | 1909 | err = replace_mm_exe_file(mm, exe.file); |
b32dfe37 | 1910 | exit: |
2903ff01 | 1911 | fdput(exe); |
b32dfe37 CG |
1912 | return err; |
1913 | } | |
1914 | ||
f606b77f | 1915 | /* |
11bbd8b4 MK |
1916 | * Check arithmetic relations of passed addresses. |
1917 | * | |
f606b77f CG |
1918 | * WARNING: we don't require any capability here so be very careful |
1919 | * in what is allowed for modification from userspace. | |
1920 | */ | |
11bbd8b4 | 1921 | static int validate_prctl_map_addr(struct prctl_mm_map *prctl_map) |
f606b77f CG |
1922 | { |
1923 | unsigned long mmap_max_addr = TASK_SIZE; | |
f606b77f CG |
1924 | int error = -EINVAL, i; |
1925 | ||
1926 | static const unsigned char offsets[] = { | |
1927 | offsetof(struct prctl_mm_map, start_code), | |
1928 | offsetof(struct prctl_mm_map, end_code), | |
1929 | offsetof(struct prctl_mm_map, start_data), | |
1930 | offsetof(struct prctl_mm_map, end_data), | |
1931 | offsetof(struct prctl_mm_map, start_brk), | |
1932 | offsetof(struct prctl_mm_map, brk), | |
1933 | offsetof(struct prctl_mm_map, start_stack), | |
1934 | offsetof(struct prctl_mm_map, arg_start), | |
1935 | offsetof(struct prctl_mm_map, arg_end), | |
1936 | offsetof(struct prctl_mm_map, env_start), | |
1937 | offsetof(struct prctl_mm_map, env_end), | |
1938 | }; | |
1939 | ||
1940 | /* | |
1941 | * Make sure the members are not somewhere outside | |
1942 | * of allowed address space. | |
1943 | */ | |
1944 | for (i = 0; i < ARRAY_SIZE(offsets); i++) { | |
1945 | u64 val = *(u64 *)((char *)prctl_map + offsets[i]); | |
1946 | ||
1947 | if ((unsigned long)val >= mmap_max_addr || | |
1948 | (unsigned long)val < mmap_min_addr) | |
1949 | goto out; | |
1950 | } | |
1951 | ||
1952 | /* | |
1953 | * Make sure the pairs are ordered. | |
1954 | */ | |
1955 | #define __prctl_check_order(__m1, __op, __m2) \ | |
1956 | ((unsigned long)prctl_map->__m1 __op \ | |
1957 | (unsigned long)prctl_map->__m2) ? 0 : -EINVAL | |
1958 | error = __prctl_check_order(start_code, <, end_code); | |
a9e73998 | 1959 | error |= __prctl_check_order(start_data,<=, end_data); |
f606b77f CG |
1960 | error |= __prctl_check_order(start_brk, <=, brk); |
1961 | error |= __prctl_check_order(arg_start, <=, arg_end); | |
1962 | error |= __prctl_check_order(env_start, <=, env_end); | |
1963 | if (error) | |
1964 | goto out; | |
1965 | #undef __prctl_check_order | |
1966 | ||
1967 | error = -EINVAL; | |
1968 | ||
f606b77f CG |
1969 | /* |
1970 | * Neither we should allow to override limits if they set. | |
1971 | */ | |
1972 | if (check_data_rlimit(rlimit(RLIMIT_DATA), prctl_map->brk, | |
1973 | prctl_map->start_brk, prctl_map->end_data, | |
1974 | prctl_map->start_data)) | |
1975 | goto out; | |
1976 | ||
f606b77f CG |
1977 | error = 0; |
1978 | out: | |
1979 | return error; | |
1980 | } | |
1981 | ||
4a00e9df | 1982 | #ifdef CONFIG_CHECKPOINT_RESTORE |
f606b77f CG |
1983 | static int prctl_set_mm_map(int opt, const void __user *addr, unsigned long data_size) |
1984 | { | |
1985 | struct prctl_mm_map prctl_map = { .exe_fd = (u32)-1, }; | |
1986 | unsigned long user_auxv[AT_VECTOR_SIZE]; | |
1987 | struct mm_struct *mm = current->mm; | |
1988 | int error; | |
1989 | ||
1990 | BUILD_BUG_ON(sizeof(user_auxv) != sizeof(mm->saved_auxv)); | |
1991 | BUILD_BUG_ON(sizeof(struct prctl_mm_map) > 256); | |
1992 | ||
1993 | if (opt == PR_SET_MM_MAP_SIZE) | |
1994 | return put_user((unsigned int)sizeof(prctl_map), | |
1995 | (unsigned int __user *)addr); | |
1996 | ||
1997 | if (data_size != sizeof(prctl_map)) | |
1998 | return -EINVAL; | |
1999 | ||
2000 | if (copy_from_user(&prctl_map, addr, sizeof(prctl_map))) | |
2001 | return -EFAULT; | |
2002 | ||
11bbd8b4 | 2003 | error = validate_prctl_map_addr(&prctl_map); |
f606b77f CG |
2004 | if (error) |
2005 | return error; | |
2006 | ||
2007 | if (prctl_map.auxv_size) { | |
11bbd8b4 MK |
2008 | /* |
2009 | * Someone is trying to cheat the auxv vector. | |
2010 | */ | |
2011 | if (!prctl_map.auxv || | |
2012 | prctl_map.auxv_size > sizeof(mm->saved_auxv)) | |
2013 | return -EINVAL; | |
2014 | ||
f606b77f CG |
2015 | memset(user_auxv, 0, sizeof(user_auxv)); |
2016 | if (copy_from_user(user_auxv, | |
2017 | (const void __user *)prctl_map.auxv, | |
2018 | prctl_map.auxv_size)) | |
2019 | return -EFAULT; | |
2020 | ||
2021 | /* Last entry must be AT_NULL as specification requires */ | |
2022 | user_auxv[AT_VECTOR_SIZE - 2] = AT_NULL; | |
2023 | user_auxv[AT_VECTOR_SIZE - 1] = AT_NULL; | |
2024 | } | |
2025 | ||
ddf1d398 | 2026 | if (prctl_map.exe_fd != (u32)-1) { |
11bbd8b4 | 2027 | /* |
ebd6de68 NV |
2028 | * Check if the current user is checkpoint/restore capable. |
2029 | * At the time of this writing, it checks for CAP_SYS_ADMIN | |
2030 | * or CAP_CHECKPOINT_RESTORE. | |
2031 | * Note that a user with access to ptrace can masquerade an | |
2032 | * arbitrary program as any executable, even setuid ones. | |
2033 | * This may have implications in the tomoyo subsystem. | |
11bbd8b4 | 2034 | */ |
ebd6de68 | 2035 | if (!checkpoint_restore_ns_capable(current_user_ns())) |
227175b2 | 2036 | return -EPERM; |
11bbd8b4 | 2037 | |
6e399cd1 | 2038 | error = prctl_set_mm_exe_file(mm, prctl_map.exe_fd); |
ddf1d398 MG |
2039 | if (error) |
2040 | return error; | |
2041 | } | |
2042 | ||
88aa7cc6 | 2043 | /* |
5afe69c2 | 2044 | * arg_lock protects concurrent updates but we still need mmap_lock for |
88aa7cc6 YS |
2045 | * read to exclude races with sys_brk. |
2046 | */ | |
d8ed45c5 | 2047 | mmap_read_lock(mm); |
f606b77f CG |
2048 | |
2049 | /* | |
2050 | * We don't validate if these members are pointing to | |
2051 | * real present VMAs because application may have correspond | |
2052 | * VMAs already unmapped and kernel uses these members for statistics | |
2053 | * output in procfs mostly, except | |
2054 | * | |
15ec0fcf | 2055 | * - @start_brk/@brk which are used in do_brk_flags but kernel lookups |
5afe69c2 | 2056 | * for VMAs when updating these members so anything wrong written |
f606b77f CG |
2057 | * here cause kernel to swear at userspace program but won't lead |
2058 | * to any problem in kernel itself | |
2059 | */ | |
2060 | ||
88aa7cc6 | 2061 | spin_lock(&mm->arg_lock); |
f606b77f CG |
2062 | mm->start_code = prctl_map.start_code; |
2063 | mm->end_code = prctl_map.end_code; | |
2064 | mm->start_data = prctl_map.start_data; | |
2065 | mm->end_data = prctl_map.end_data; | |
2066 | mm->start_brk = prctl_map.start_brk; | |
2067 | mm->brk = prctl_map.brk; | |
2068 | mm->start_stack = prctl_map.start_stack; | |
2069 | mm->arg_start = prctl_map.arg_start; | |
2070 | mm->arg_end = prctl_map.arg_end; | |
2071 | mm->env_start = prctl_map.env_start; | |
2072 | mm->env_end = prctl_map.env_end; | |
88aa7cc6 | 2073 | spin_unlock(&mm->arg_lock); |
f606b77f CG |
2074 | |
2075 | /* | |
2076 | * Note this update of @saved_auxv is lockless thus | |
2077 | * if someone reads this member in procfs while we're | |
2078 | * updating -- it may get partly updated results. It's | |
2079 | * known and acceptable trade off: we leave it as is to | |
2080 | * not introduce additional locks here making the kernel | |
2081 | * more complex. | |
2082 | */ | |
2083 | if (prctl_map.auxv_size) | |
2084 | memcpy(mm->saved_auxv, user_auxv, sizeof(user_auxv)); | |
2085 | ||
d8ed45c5 | 2086 | mmap_read_unlock(mm); |
ddf1d398 | 2087 | return 0; |
f606b77f CG |
2088 | } |
2089 | #endif /* CONFIG_CHECKPOINT_RESTORE */ | |
2090 | ||
4a00e9df AD |
2091 | static int prctl_set_auxv(struct mm_struct *mm, unsigned long addr, |
2092 | unsigned long len) | |
2093 | { | |
2094 | /* | |
2095 | * This doesn't move the auxiliary vector itself since it's pinned to | |
2096 | * mm_struct, but it permits filling the vector with new values. It's | |
2097 | * up to the caller to provide sane values here, otherwise userspace | |
2098 | * tools which use this vector might be unhappy. | |
2099 | */ | |
c995f12a | 2100 | unsigned long user_auxv[AT_VECTOR_SIZE] = {}; |
4a00e9df AD |
2101 | |
2102 | if (len > sizeof(user_auxv)) | |
2103 | return -EINVAL; | |
2104 | ||
2105 | if (copy_from_user(user_auxv, (const void __user *)addr, len)) | |
2106 | return -EFAULT; | |
2107 | ||
2108 | /* Make sure the last entry is always AT_NULL */ | |
2109 | user_auxv[AT_VECTOR_SIZE - 2] = 0; | |
2110 | user_auxv[AT_VECTOR_SIZE - 1] = 0; | |
2111 | ||
2112 | BUILD_BUG_ON(sizeof(user_auxv) != sizeof(mm->saved_auxv)); | |
2113 | ||
2114 | task_lock(current); | |
2115 | memcpy(mm->saved_auxv, user_auxv, len); | |
2116 | task_unlock(current); | |
2117 | ||
2118 | return 0; | |
2119 | } | |
2120 | ||
028ee4be CG |
2121 | static int prctl_set_mm(int opt, unsigned long addr, |
2122 | unsigned long arg4, unsigned long arg5) | |
2123 | { | |
028ee4be | 2124 | struct mm_struct *mm = current->mm; |
11bbd8b4 MK |
2125 | struct prctl_mm_map prctl_map = { |
2126 | .auxv = NULL, | |
2127 | .auxv_size = 0, | |
2128 | .exe_fd = -1, | |
2129 | }; | |
fe8c7f5c CG |
2130 | struct vm_area_struct *vma; |
2131 | int error; | |
028ee4be | 2132 | |
f606b77f CG |
2133 | if (arg5 || (arg4 && (opt != PR_SET_MM_AUXV && |
2134 | opt != PR_SET_MM_MAP && | |
2135 | opt != PR_SET_MM_MAP_SIZE))) | |
028ee4be CG |
2136 | return -EINVAL; |
2137 | ||
f606b77f CG |
2138 | #ifdef CONFIG_CHECKPOINT_RESTORE |
2139 | if (opt == PR_SET_MM_MAP || opt == PR_SET_MM_MAP_SIZE) | |
2140 | return prctl_set_mm_map(opt, (const void __user *)addr, arg4); | |
2141 | #endif | |
2142 | ||
79f0713d | 2143 | if (!capable(CAP_SYS_RESOURCE)) |
028ee4be CG |
2144 | return -EPERM; |
2145 | ||
6e399cd1 DB |
2146 | if (opt == PR_SET_MM_EXE_FILE) |
2147 | return prctl_set_mm_exe_file(mm, (unsigned int)addr); | |
b32dfe37 | 2148 | |
4a00e9df AD |
2149 | if (opt == PR_SET_MM_AUXV) |
2150 | return prctl_set_auxv(mm, addr, arg4); | |
2151 | ||
1ad75b9e | 2152 | if (addr >= TASK_SIZE || addr < mmap_min_addr) |
028ee4be CG |
2153 | return -EINVAL; |
2154 | ||
fe8c7f5c CG |
2155 | error = -EINVAL; |
2156 | ||
bc81426f | 2157 | /* |
5afe69c2 | 2158 | * arg_lock protects concurrent updates of arg boundaries, we need |
c1e8d7c6 | 2159 | * mmap_lock for a) concurrent sys_brk, b) finding VMA for addr |
bc81426f MK |
2160 | * validation. |
2161 | */ | |
d8ed45c5 | 2162 | mmap_read_lock(mm); |
028ee4be CG |
2163 | vma = find_vma(mm, addr); |
2164 | ||
bc81426f | 2165 | spin_lock(&mm->arg_lock); |
4a00e9df AD |
2166 | prctl_map.start_code = mm->start_code; |
2167 | prctl_map.end_code = mm->end_code; | |
2168 | prctl_map.start_data = mm->start_data; | |
2169 | prctl_map.end_data = mm->end_data; | |
2170 | prctl_map.start_brk = mm->start_brk; | |
2171 | prctl_map.brk = mm->brk; | |
2172 | prctl_map.start_stack = mm->start_stack; | |
2173 | prctl_map.arg_start = mm->arg_start; | |
2174 | prctl_map.arg_end = mm->arg_end; | |
2175 | prctl_map.env_start = mm->env_start; | |
2176 | prctl_map.env_end = mm->env_end; | |
4a00e9df | 2177 | |
028ee4be CG |
2178 | switch (opt) { |
2179 | case PR_SET_MM_START_CODE: | |
4a00e9df | 2180 | prctl_map.start_code = addr; |
fe8c7f5c | 2181 | break; |
028ee4be | 2182 | case PR_SET_MM_END_CODE: |
4a00e9df | 2183 | prctl_map.end_code = addr; |
028ee4be | 2184 | break; |
028ee4be | 2185 | case PR_SET_MM_START_DATA: |
4a00e9df | 2186 | prctl_map.start_data = addr; |
028ee4be | 2187 | break; |
fe8c7f5c | 2188 | case PR_SET_MM_END_DATA: |
4a00e9df AD |
2189 | prctl_map.end_data = addr; |
2190 | break; | |
2191 | case PR_SET_MM_START_STACK: | |
2192 | prctl_map.start_stack = addr; | |
028ee4be | 2193 | break; |
028ee4be | 2194 | case PR_SET_MM_START_BRK: |
4a00e9df | 2195 | prctl_map.start_brk = addr; |
028ee4be | 2196 | break; |
028ee4be | 2197 | case PR_SET_MM_BRK: |
4a00e9df | 2198 | prctl_map.brk = addr; |
028ee4be | 2199 | break; |
4a00e9df AD |
2200 | case PR_SET_MM_ARG_START: |
2201 | prctl_map.arg_start = addr; | |
2202 | break; | |
2203 | case PR_SET_MM_ARG_END: | |
2204 | prctl_map.arg_end = addr; | |
2205 | break; | |
2206 | case PR_SET_MM_ENV_START: | |
2207 | prctl_map.env_start = addr; | |
2208 | break; | |
2209 | case PR_SET_MM_ENV_END: | |
2210 | prctl_map.env_end = addr; | |
2211 | break; | |
2212 | default: | |
2213 | goto out; | |
2214 | } | |
2215 | ||
11bbd8b4 | 2216 | error = validate_prctl_map_addr(&prctl_map); |
4a00e9df AD |
2217 | if (error) |
2218 | goto out; | |
028ee4be | 2219 | |
4a00e9df | 2220 | switch (opt) { |
fe8c7f5c CG |
2221 | /* |
2222 | * If command line arguments and environment | |
2223 | * are placed somewhere else on stack, we can | |
2224 | * set them up here, ARG_START/END to setup | |
5afe69c2 | 2225 | * command line arguments and ENV_START/END |
fe8c7f5c CG |
2226 | * for environment. |
2227 | */ | |
2228 | case PR_SET_MM_START_STACK: | |
2229 | case PR_SET_MM_ARG_START: | |
2230 | case PR_SET_MM_ARG_END: | |
2231 | case PR_SET_MM_ENV_START: | |
2232 | case PR_SET_MM_ENV_END: | |
2233 | if (!vma) { | |
2234 | error = -EFAULT; | |
2235 | goto out; | |
2236 | } | |
028ee4be CG |
2237 | } |
2238 | ||
4a00e9df AD |
2239 | mm->start_code = prctl_map.start_code; |
2240 | mm->end_code = prctl_map.end_code; | |
2241 | mm->start_data = prctl_map.start_data; | |
2242 | mm->end_data = prctl_map.end_data; | |
2243 | mm->start_brk = prctl_map.start_brk; | |
2244 | mm->brk = prctl_map.brk; | |
2245 | mm->start_stack = prctl_map.start_stack; | |
2246 | mm->arg_start = prctl_map.arg_start; | |
2247 | mm->arg_end = prctl_map.arg_end; | |
2248 | mm->env_start = prctl_map.env_start; | |
2249 | mm->env_end = prctl_map.env_end; | |
2250 | ||
028ee4be | 2251 | error = 0; |
028ee4be | 2252 | out: |
bc81426f | 2253 | spin_unlock(&mm->arg_lock); |
d8ed45c5 | 2254 | mmap_read_unlock(mm); |
028ee4be CG |
2255 | return error; |
2256 | } | |
300f786b | 2257 | |
52b36941 | 2258 | #ifdef CONFIG_CHECKPOINT_RESTORE |
986b9eac | 2259 | static int prctl_get_tid_address(struct task_struct *me, int __user * __user *tid_addr) |
300f786b CG |
2260 | { |
2261 | return put_user(me->clear_child_tid, tid_addr); | |
2262 | } | |
52b36941 | 2263 | #else |
986b9eac | 2264 | static int prctl_get_tid_address(struct task_struct *me, int __user * __user *tid_addr) |
300f786b CG |
2265 | { |
2266 | return -EINVAL; | |
2267 | } | |
028ee4be CG |
2268 | #endif |
2269 | ||
749860ce PT |
2270 | static int propagate_has_child_subreaper(struct task_struct *p, void *data) |
2271 | { | |
2272 | /* | |
5afe69c2 XC |
2273 | * If task has has_child_subreaper - all its descendants |
2274 | * already have these flag too and new descendants will | |
749860ce PT |
2275 | * inherit it on fork, skip them. |
2276 | * | |
2277 | * If we've found child_reaper - skip descendants in | |
2278 | * it's subtree as they will never get out pidns. | |
2279 | */ | |
2280 | if (p->signal->has_child_subreaper || | |
2281 | is_child_reaper(task_pid(p))) | |
2282 | return 0; | |
2283 | ||
2284 | p->signal->has_child_subreaper = 1; | |
2285 | return 1; | |
2286 | } | |
2287 | ||
7bbf1373 | 2288 | int __weak arch_prctl_spec_ctrl_get(struct task_struct *t, unsigned long which) |
b617cfc8 TG |
2289 | { |
2290 | return -EINVAL; | |
2291 | } | |
2292 | ||
7bbf1373 KC |
2293 | int __weak arch_prctl_spec_ctrl_set(struct task_struct *t, unsigned long which, |
2294 | unsigned long ctrl) | |
b617cfc8 TG |
2295 | { |
2296 | return -EINVAL; | |
2297 | } | |
2298 | ||
a37b0715 | 2299 | #define PR_IO_FLUSHER (PF_MEMALLOC_NOIO | PF_LOCAL_THROTTLE) |
8d19f1c8 | 2300 | |
9a10064f CC |
2301 | #ifdef CONFIG_ANON_VMA_NAME |
2302 | ||
2303 | #define ANON_VMA_NAME_MAX_LEN 80 | |
2304 | #define ANON_VMA_NAME_INVALID_CHARS "\\`$[]" | |
2305 | ||
2306 | static inline bool is_valid_name_char(char ch) | |
2307 | { | |
2308 | /* printable ascii characters, excluding ANON_VMA_NAME_INVALID_CHARS */ | |
2309 | return ch > 0x1f && ch < 0x7f && | |
2310 | !strchr(ANON_VMA_NAME_INVALID_CHARS, ch); | |
2311 | } | |
2312 | ||
2313 | static int prctl_set_vma(unsigned long opt, unsigned long addr, | |
2314 | unsigned long size, unsigned long arg) | |
2315 | { | |
2316 | struct mm_struct *mm = current->mm; | |
2317 | const char __user *uname; | |
5c26f6ac | 2318 | struct anon_vma_name *anon_name = NULL; |
9a10064f CC |
2319 | int error; |
2320 | ||
2321 | switch (opt) { | |
2322 | case PR_SET_VMA_ANON_NAME: | |
2323 | uname = (const char __user *)arg; | |
2324 | if (uname) { | |
5c26f6ac | 2325 | char *name, *pch; |
9a10064f | 2326 | |
5c26f6ac | 2327 | name = strndup_user(uname, ANON_VMA_NAME_MAX_LEN); |
9a10064f CC |
2328 | if (IS_ERR(name)) |
2329 | return PTR_ERR(name); | |
2330 | ||
2331 | for (pch = name; *pch != '\0'; pch++) { | |
2332 | if (!is_valid_name_char(*pch)) { | |
2333 | kfree(name); | |
2334 | return -EINVAL; | |
2335 | } | |
2336 | } | |
5c26f6ac SB |
2337 | /* anon_vma has its own copy */ |
2338 | anon_name = anon_vma_name_alloc(name); | |
2339 | kfree(name); | |
2340 | if (!anon_name) | |
2341 | return -ENOMEM; | |
2342 | ||
9a10064f CC |
2343 | } |
2344 | ||
2345 | mmap_write_lock(mm); | |
5c26f6ac | 2346 | error = madvise_set_anon_name(mm, addr, size, anon_name); |
9a10064f | 2347 | mmap_write_unlock(mm); |
5c26f6ac | 2348 | anon_vma_name_put(anon_name); |
9a10064f CC |
2349 | break; |
2350 | default: | |
2351 | error = -EINVAL; | |
2352 | } | |
2353 | ||
2354 | return error; | |
2355 | } | |
2356 | ||
2357 | #else /* CONFIG_ANON_VMA_NAME */ | |
2358 | static int prctl_set_vma(unsigned long opt, unsigned long start, | |
2359 | unsigned long size, unsigned long arg) | |
2360 | { | |
2361 | return -EINVAL; | |
2362 | } | |
2363 | #endif /* CONFIG_ANON_VMA_NAME */ | |
2364 | ||
b507808e JG |
2365 | static inline int prctl_set_mdwe(unsigned long bits, unsigned long arg3, |
2366 | unsigned long arg4, unsigned long arg5) | |
2367 | { | |
2368 | if (arg3 || arg4 || arg5) | |
2369 | return -EINVAL; | |
2370 | ||
2371 | if (bits & ~(PR_MDWE_REFUSE_EXEC_GAIN)) | |
2372 | return -EINVAL; | |
2373 | ||
2374 | if (bits & PR_MDWE_REFUSE_EXEC_GAIN) | |
2375 | set_bit(MMF_HAS_MDWE, ¤t->mm->flags); | |
2376 | else if (test_bit(MMF_HAS_MDWE, ¤t->mm->flags)) | |
2377 | return -EPERM; /* Cannot unset the flag */ | |
2378 | ||
2379 | return 0; | |
2380 | } | |
2381 | ||
2382 | static inline int prctl_get_mdwe(unsigned long arg2, unsigned long arg3, | |
2383 | unsigned long arg4, unsigned long arg5) | |
2384 | { | |
2385 | if (arg2 || arg3 || arg4 || arg5) | |
2386 | return -EINVAL; | |
2387 | ||
2388 | return test_bit(MMF_HAS_MDWE, ¤t->mm->flags) ? | |
2389 | PR_MDWE_REFUSE_EXEC_GAIN : 0; | |
2390 | } | |
2391 | ||
ddc65971 JT |
2392 | static int prctl_get_auxv(void __user *addr, unsigned long len) |
2393 | { | |
2394 | struct mm_struct *mm = current->mm; | |
2395 | unsigned long size = min_t(unsigned long, sizeof(mm->saved_auxv), len); | |
2396 | ||
2397 | if (size && copy_to_user(addr, mm->saved_auxv, size)) | |
2398 | return -EFAULT; | |
2399 | return sizeof(mm->saved_auxv); | |
2400 | } | |
2401 | ||
c4ea37c2 HC |
2402 | SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3, |
2403 | unsigned long, arg4, unsigned long, arg5) | |
1da177e4 | 2404 | { |
b6dff3ec DH |
2405 | struct task_struct *me = current; |
2406 | unsigned char comm[sizeof(me->comm)]; | |
2407 | long error; | |
1da177e4 | 2408 | |
d84f4f99 DH |
2409 | error = security_task_prctl(option, arg2, arg3, arg4, arg5); |
2410 | if (error != -ENOSYS) | |
1da177e4 LT |
2411 | return error; |
2412 | ||
d84f4f99 | 2413 | error = 0; |
1da177e4 | 2414 | switch (option) { |
f3cbd435 AM |
2415 | case PR_SET_PDEATHSIG: |
2416 | if (!valid_signal(arg2)) { | |
2417 | error = -EINVAL; | |
1da177e4 | 2418 | break; |
f3cbd435 AM |
2419 | } |
2420 | me->pdeath_signal = arg2; | |
2421 | break; | |
2422 | case PR_GET_PDEATHSIG: | |
2423 | error = put_user(me->pdeath_signal, (int __user *)arg2); | |
2424 | break; | |
2425 | case PR_GET_DUMPABLE: | |
2426 | error = get_dumpable(me->mm); | |
2427 | break; | |
2428 | case PR_SET_DUMPABLE: | |
2429 | if (arg2 != SUID_DUMP_DISABLE && arg2 != SUID_DUMP_USER) { | |
2430 | error = -EINVAL; | |
1da177e4 | 2431 | break; |
f3cbd435 AM |
2432 | } |
2433 | set_dumpable(me->mm, arg2); | |
2434 | break; | |
1da177e4 | 2435 | |
f3cbd435 AM |
2436 | case PR_SET_UNALIGN: |
2437 | error = SET_UNALIGN_CTL(me, arg2); | |
2438 | break; | |
2439 | case PR_GET_UNALIGN: | |
2440 | error = GET_UNALIGN_CTL(me, arg2); | |
2441 | break; | |
2442 | case PR_SET_FPEMU: | |
2443 | error = SET_FPEMU_CTL(me, arg2); | |
2444 | break; | |
2445 | case PR_GET_FPEMU: | |
2446 | error = GET_FPEMU_CTL(me, arg2); | |
2447 | break; | |
2448 | case PR_SET_FPEXC: | |
2449 | error = SET_FPEXC_CTL(me, arg2); | |
2450 | break; | |
2451 | case PR_GET_FPEXC: | |
2452 | error = GET_FPEXC_CTL(me, arg2); | |
2453 | break; | |
2454 | case PR_GET_TIMING: | |
2455 | error = PR_TIMING_STATISTICAL; | |
2456 | break; | |
2457 | case PR_SET_TIMING: | |
2458 | if (arg2 != PR_TIMING_STATISTICAL) | |
2459 | error = -EINVAL; | |
2460 | break; | |
2461 | case PR_SET_NAME: | |
2462 | comm[sizeof(me->comm) - 1] = 0; | |
2463 | if (strncpy_from_user(comm, (char __user *)arg2, | |
2464 | sizeof(me->comm) - 1) < 0) | |
2465 | return -EFAULT; | |
2466 | set_task_comm(me, comm); | |
2467 | proc_comm_connector(me); | |
2468 | break; | |
2469 | case PR_GET_NAME: | |
2470 | get_task_comm(comm, me); | |
2471 | if (copy_to_user((char __user *)arg2, comm, sizeof(comm))) | |
2472 | return -EFAULT; | |
2473 | break; | |
2474 | case PR_GET_ENDIAN: | |
2475 | error = GET_ENDIAN(me, arg2); | |
2476 | break; | |
2477 | case PR_SET_ENDIAN: | |
2478 | error = SET_ENDIAN(me, arg2); | |
2479 | break; | |
2480 | case PR_GET_SECCOMP: | |
2481 | error = prctl_get_seccomp(); | |
2482 | break; | |
2483 | case PR_SET_SECCOMP: | |
2484 | error = prctl_set_seccomp(arg2, (char __user *)arg3); | |
2485 | break; | |
2486 | case PR_GET_TSC: | |
2487 | error = GET_TSC_CTL(arg2); | |
2488 | break; | |
2489 | case PR_SET_TSC: | |
2490 | error = SET_TSC_CTL(arg2); | |
2491 | break; | |
2492 | case PR_TASK_PERF_EVENTS_DISABLE: | |
2493 | error = perf_event_task_disable(); | |
2494 | break; | |
2495 | case PR_TASK_PERF_EVENTS_ENABLE: | |
2496 | error = perf_event_task_enable(); | |
2497 | break; | |
2498 | case PR_GET_TIMERSLACK: | |
da8b44d5 JS |
2499 | if (current->timer_slack_ns > ULONG_MAX) |
2500 | error = ULONG_MAX; | |
2501 | else | |
2502 | error = current->timer_slack_ns; | |
f3cbd435 AM |
2503 | break; |
2504 | case PR_SET_TIMERSLACK: | |
2505 | if (arg2 <= 0) | |
2506 | current->timer_slack_ns = | |
6976675d | 2507 | current->default_timer_slack_ns; |
f3cbd435 AM |
2508 | else |
2509 | current->timer_slack_ns = arg2; | |
2510 | break; | |
2511 | case PR_MCE_KILL: | |
2512 | if (arg4 | arg5) | |
2513 | return -EINVAL; | |
2514 | switch (arg2) { | |
2515 | case PR_MCE_KILL_CLEAR: | |
2516 | if (arg3 != 0) | |
4db96cf0 | 2517 | return -EINVAL; |
f3cbd435 | 2518 | current->flags &= ~PF_MCE_PROCESS; |
4db96cf0 | 2519 | break; |
f3cbd435 AM |
2520 | case PR_MCE_KILL_SET: |
2521 | current->flags |= PF_MCE_PROCESS; | |
2522 | if (arg3 == PR_MCE_KILL_EARLY) | |
2523 | current->flags |= PF_MCE_EARLY; | |
2524 | else if (arg3 == PR_MCE_KILL_LATE) | |
2525 | current->flags &= ~PF_MCE_EARLY; | |
2526 | else if (arg3 == PR_MCE_KILL_DEFAULT) | |
2527 | current->flags &= | |
2528 | ~(PF_MCE_EARLY|PF_MCE_PROCESS); | |
1087e9b4 | 2529 | else |
259e5e6c | 2530 | return -EINVAL; |
259e5e6c | 2531 | break; |
ddc65971 JT |
2532 | case PR_GET_AUXV: |
2533 | if (arg4 || arg5) | |
2534 | return -EINVAL; | |
2535 | error = prctl_get_auxv((void __user *)arg2, arg3); | |
2536 | break; | |
1da177e4 | 2537 | default: |
f3cbd435 AM |
2538 | return -EINVAL; |
2539 | } | |
2540 | break; | |
2541 | case PR_MCE_KILL_GET: | |
2542 | if (arg2 | arg3 | arg4 | arg5) | |
2543 | return -EINVAL; | |
2544 | if (current->flags & PF_MCE_PROCESS) | |
2545 | error = (current->flags & PF_MCE_EARLY) ? | |
2546 | PR_MCE_KILL_EARLY : PR_MCE_KILL_LATE; | |
2547 | else | |
2548 | error = PR_MCE_KILL_DEFAULT; | |
2549 | break; | |
2550 | case PR_SET_MM: | |
2551 | error = prctl_set_mm(arg2, arg3, arg4, arg5); | |
2552 | break; | |
2553 | case PR_GET_TID_ADDRESS: | |
986b9eac | 2554 | error = prctl_get_tid_address(me, (int __user * __user *)arg2); |
f3cbd435 AM |
2555 | break; |
2556 | case PR_SET_CHILD_SUBREAPER: | |
2557 | me->signal->is_child_subreaper = !!arg2; | |
749860ce PT |
2558 | if (!arg2) |
2559 | break; | |
2560 | ||
2561 | walk_process_tree(me, propagate_has_child_subreaper, NULL); | |
f3cbd435 AM |
2562 | break; |
2563 | case PR_GET_CHILD_SUBREAPER: | |
2564 | error = put_user(me->signal->is_child_subreaper, | |
2565 | (int __user *)arg2); | |
2566 | break; | |
2567 | case PR_SET_NO_NEW_PRIVS: | |
2568 | if (arg2 != 1 || arg3 || arg4 || arg5) | |
2569 | return -EINVAL; | |
2570 | ||
1d4457f9 | 2571 | task_set_no_new_privs(current); |
f3cbd435 AM |
2572 | break; |
2573 | case PR_GET_NO_NEW_PRIVS: | |
2574 | if (arg2 || arg3 || arg4 || arg5) | |
2575 | return -EINVAL; | |
1d4457f9 | 2576 | return task_no_new_privs(current) ? 1 : 0; |
a0715cc2 AT |
2577 | case PR_GET_THP_DISABLE: |
2578 | if (arg2 || arg3 || arg4 || arg5) | |
2579 | return -EINVAL; | |
18600332 | 2580 | error = !!test_bit(MMF_DISABLE_THP, &me->mm->flags); |
a0715cc2 AT |
2581 | break; |
2582 | case PR_SET_THP_DISABLE: | |
2583 | if (arg3 || arg4 || arg5) | |
2584 | return -EINVAL; | |
d8ed45c5 | 2585 | if (mmap_write_lock_killable(me->mm)) |
17b0573d | 2586 | return -EINTR; |
a0715cc2 | 2587 | if (arg2) |
18600332 | 2588 | set_bit(MMF_DISABLE_THP, &me->mm->flags); |
a0715cc2 | 2589 | else |
18600332 | 2590 | clear_bit(MMF_DISABLE_THP, &me->mm->flags); |
d8ed45c5 | 2591 | mmap_write_unlock(me->mm); |
a0715cc2 | 2592 | break; |
fe3d197f | 2593 | case PR_MPX_ENABLE_MANAGEMENT: |
fe3d197f | 2594 | case PR_MPX_DISABLE_MANAGEMENT: |
f240652b DH |
2595 | /* No longer implemented: */ |
2596 | return -EINVAL; | |
9791554b PB |
2597 | case PR_SET_FP_MODE: |
2598 | error = SET_FP_MODE(me, arg2); | |
2599 | break; | |
2600 | case PR_GET_FP_MODE: | |
2601 | error = GET_FP_MODE(me); | |
2602 | break; | |
2d2123bc DM |
2603 | case PR_SVE_SET_VL: |
2604 | error = SVE_SET_VL(arg2); | |
2605 | break; | |
2606 | case PR_SVE_GET_VL: | |
2607 | error = SVE_GET_VL(); | |
2608 | break; | |
9e4ab6c8 MB |
2609 | case PR_SME_SET_VL: |
2610 | error = SME_SET_VL(arg2); | |
2611 | break; | |
2612 | case PR_SME_GET_VL: | |
2613 | error = SME_GET_VL(); | |
2614 | break; | |
b617cfc8 TG |
2615 | case PR_GET_SPECULATION_CTRL: |
2616 | if (arg3 || arg4 || arg5) | |
2617 | return -EINVAL; | |
7bbf1373 | 2618 | error = arch_prctl_spec_ctrl_get(me, arg2); |
b617cfc8 TG |
2619 | break; |
2620 | case PR_SET_SPECULATION_CTRL: | |
2621 | if (arg4 || arg5) | |
2622 | return -EINVAL; | |
7bbf1373 | 2623 | error = arch_prctl_spec_ctrl_set(me, arg2, arg3); |
b617cfc8 | 2624 | break; |
ba830885 KM |
2625 | case PR_PAC_RESET_KEYS: |
2626 | if (arg3 || arg4 || arg5) | |
2627 | return -EINVAL; | |
2628 | error = PAC_RESET_KEYS(me, arg2); | |
2629 | break; | |
20169862 PC |
2630 | case PR_PAC_SET_ENABLED_KEYS: |
2631 | if (arg4 || arg5) | |
2632 | return -EINVAL; | |
2633 | error = PAC_SET_ENABLED_KEYS(me, arg2, arg3); | |
2634 | break; | |
2635 | case PR_PAC_GET_ENABLED_KEYS: | |
2636 | if (arg2 || arg3 || arg4 || arg5) | |
2637 | return -EINVAL; | |
2638 | error = PAC_GET_ENABLED_KEYS(me); | |
2639 | break; | |
63f0c603 | 2640 | case PR_SET_TAGGED_ADDR_CTRL: |
3e91ec89 CM |
2641 | if (arg3 || arg4 || arg5) |
2642 | return -EINVAL; | |
63f0c603 CM |
2643 | error = SET_TAGGED_ADDR_CTRL(arg2); |
2644 | break; | |
2645 | case PR_GET_TAGGED_ADDR_CTRL: | |
3e91ec89 CM |
2646 | if (arg2 || arg3 || arg4 || arg5) |
2647 | return -EINVAL; | |
63f0c603 CM |
2648 | error = GET_TAGGED_ADDR_CTRL(); |
2649 | break; | |
8d19f1c8 MC |
2650 | case PR_SET_IO_FLUSHER: |
2651 | if (!capable(CAP_SYS_RESOURCE)) | |
2652 | return -EPERM; | |
2653 | ||
2654 | if (arg3 || arg4 || arg5) | |
2655 | return -EINVAL; | |
2656 | ||
2657 | if (arg2 == 1) | |
2658 | current->flags |= PR_IO_FLUSHER; | |
2659 | else if (!arg2) | |
2660 | current->flags &= ~PR_IO_FLUSHER; | |
2661 | else | |
2662 | return -EINVAL; | |
2663 | break; | |
2664 | case PR_GET_IO_FLUSHER: | |
2665 | if (!capable(CAP_SYS_RESOURCE)) | |
2666 | return -EPERM; | |
2667 | ||
2668 | if (arg2 || arg3 || arg4 || arg5) | |
2669 | return -EINVAL; | |
2670 | ||
2671 | error = (current->flags & PR_IO_FLUSHER) == PR_IO_FLUSHER; | |
2672 | break; | |
1446e1df GKB |
2673 | case PR_SET_SYSCALL_USER_DISPATCH: |
2674 | error = set_syscall_user_dispatch(arg2, arg3, arg4, | |
2675 | (char __user *) arg5); | |
2676 | break; | |
7ac592aa CH |
2677 | #ifdef CONFIG_SCHED_CORE |
2678 | case PR_SCHED_CORE: | |
2679 | error = sched_core_share_pid(arg2, arg3, arg4, arg5); | |
2680 | break; | |
2681 | #endif | |
b507808e JG |
2682 | case PR_SET_MDWE: |
2683 | error = prctl_set_mdwe(arg2, arg3, arg4, arg5); | |
2684 | break; | |
2685 | case PR_GET_MDWE: | |
2686 | error = prctl_get_mdwe(arg2, arg3, arg4, arg5); | |
2687 | break; | |
9a10064f CC |
2688 | case PR_SET_VMA: |
2689 | error = prctl_set_vma(arg2, arg3, arg4, arg5); | |
2690 | break; | |
d7597f59 SR |
2691 | #ifdef CONFIG_KSM |
2692 | case PR_SET_MEMORY_MERGE: | |
2693 | if (arg3 || arg4 || arg5) | |
2694 | return -EINVAL; | |
2695 | if (mmap_write_lock_killable(me->mm)) | |
2696 | return -EINTR; | |
2697 | ||
24139c07 | 2698 | if (arg2) |
d7597f59 | 2699 | error = ksm_enable_merge_any(me->mm); |
24139c07 DH |
2700 | else |
2701 | error = ksm_disable_merge_any(me->mm); | |
d7597f59 SR |
2702 | mmap_write_unlock(me->mm); |
2703 | break; | |
2704 | case PR_GET_MEMORY_MERGE: | |
2705 | if (arg2 || arg3 || arg4 || arg5) | |
2706 | return -EINVAL; | |
2707 | ||
2708 | error = !!test_bit(MMF_VM_MERGE_ANY, &me->mm->flags); | |
2709 | break; | |
2710 | #endif | |
f3cbd435 AM |
2711 | default: |
2712 | error = -EINVAL; | |
2713 | break; | |
1da177e4 LT |
2714 | } |
2715 | return error; | |
2716 | } | |
3cfc348b | 2717 | |
836f92ad HC |
2718 | SYSCALL_DEFINE3(getcpu, unsigned __user *, cpup, unsigned __user *, nodep, |
2719 | struct getcpu_cache __user *, unused) | |
3cfc348b AK |
2720 | { |
2721 | int err = 0; | |
2722 | int cpu = raw_smp_processor_id(); | |
ec94fc3d | 2723 | |
3cfc348b AK |
2724 | if (cpup) |
2725 | err |= put_user(cpu, cpup); | |
2726 | if (nodep) | |
2727 | err |= put_user(cpu_to_node(cpu), nodep); | |
3cfc348b AK |
2728 | return err ? -EFAULT : 0; |
2729 | } | |
10a0a8d4 | 2730 | |
4a22f166 SR |
2731 | /** |
2732 | * do_sysinfo - fill in sysinfo struct | |
2733 | * @info: pointer to buffer to fill | |
2734 | */ | |
2735 | static int do_sysinfo(struct sysinfo *info) | |
2736 | { | |
2737 | unsigned long mem_total, sav_total; | |
2738 | unsigned int mem_unit, bitcount; | |
dc1b7b6c | 2739 | struct timespec64 tp; |
4a22f166 SR |
2740 | |
2741 | memset(info, 0, sizeof(struct sysinfo)); | |
2742 | ||
dc1b7b6c | 2743 | ktime_get_boottime_ts64(&tp); |
ecc421e0 | 2744 | timens_add_boottime(&tp); |
4a22f166 SR |
2745 | info->uptime = tp.tv_sec + (tp.tv_nsec ? 1 : 0); |
2746 | ||
2747 | get_avenrun(info->loads, 0, SI_LOAD_SHIFT - FSHIFT); | |
2748 | ||
2749 | info->procs = nr_threads; | |
2750 | ||
2751 | si_meminfo(info); | |
2752 | si_swapinfo(info); | |
2753 | ||
2754 | /* | |
2755 | * If the sum of all the available memory (i.e. ram + swap) | |
2756 | * is less than can be stored in a 32 bit unsigned long then | |
2757 | * we can be binary compatible with 2.2.x kernels. If not, | |
2758 | * well, in that case 2.2.x was broken anyways... | |
2759 | * | |
2760 | * -Erik Andersen <andersee@debian.org> | |
2761 | */ | |
2762 | ||
2763 | mem_total = info->totalram + info->totalswap; | |
2764 | if (mem_total < info->totalram || mem_total < info->totalswap) | |
2765 | goto out; | |
2766 | bitcount = 0; | |
2767 | mem_unit = info->mem_unit; | |
2768 | while (mem_unit > 1) { | |
2769 | bitcount++; | |
2770 | mem_unit >>= 1; | |
2771 | sav_total = mem_total; | |
2772 | mem_total <<= 1; | |
2773 | if (mem_total < sav_total) | |
2774 | goto out; | |
2775 | } | |
2776 | ||
2777 | /* | |
2778 | * If mem_total did not overflow, multiply all memory values by | |
2779 | * info->mem_unit and set it to 1. This leaves things compatible | |
2780 | * with 2.2.x, and also retains compatibility with earlier 2.4.x | |
2781 | * kernels... | |
2782 | */ | |
2783 | ||
2784 | info->mem_unit = 1; | |
2785 | info->totalram <<= bitcount; | |
2786 | info->freeram <<= bitcount; | |
2787 | info->sharedram <<= bitcount; | |
2788 | info->bufferram <<= bitcount; | |
2789 | info->totalswap <<= bitcount; | |
2790 | info->freeswap <<= bitcount; | |
2791 | info->totalhigh <<= bitcount; | |
2792 | info->freehigh <<= bitcount; | |
2793 | ||
2794 | out: | |
2795 | return 0; | |
2796 | } | |
2797 | ||
2798 | SYSCALL_DEFINE1(sysinfo, struct sysinfo __user *, info) | |
2799 | { | |
2800 | struct sysinfo val; | |
2801 | ||
2802 | do_sysinfo(&val); | |
2803 | ||
2804 | if (copy_to_user(info, &val, sizeof(struct sysinfo))) | |
2805 | return -EFAULT; | |
2806 | ||
2807 | return 0; | |
2808 | } | |
2809 | ||
2810 | #ifdef CONFIG_COMPAT | |
2811 | struct compat_sysinfo { | |
2812 | s32 uptime; | |
2813 | u32 loads[3]; | |
2814 | u32 totalram; | |
2815 | u32 freeram; | |
2816 | u32 sharedram; | |
2817 | u32 bufferram; | |
2818 | u32 totalswap; | |
2819 | u32 freeswap; | |
2820 | u16 procs; | |
2821 | u16 pad; | |
2822 | u32 totalhigh; | |
2823 | u32 freehigh; | |
2824 | u32 mem_unit; | |
2825 | char _f[20-2*sizeof(u32)-sizeof(int)]; | |
2826 | }; | |
2827 | ||
2828 | COMPAT_SYSCALL_DEFINE1(sysinfo, struct compat_sysinfo __user *, info) | |
2829 | { | |
2830 | struct sysinfo s; | |
ce5155c4 | 2831 | struct compat_sysinfo s_32; |
4a22f166 SR |
2832 | |
2833 | do_sysinfo(&s); | |
2834 | ||
2835 | /* Check to see if any memory value is too large for 32-bit and scale | |
2836 | * down if needed | |
2837 | */ | |
0baae41e | 2838 | if (upper_32_bits(s.totalram) || upper_32_bits(s.totalswap)) { |
4a22f166 SR |
2839 | int bitcount = 0; |
2840 | ||
2841 | while (s.mem_unit < PAGE_SIZE) { | |
2842 | s.mem_unit <<= 1; | |
2843 | bitcount++; | |
2844 | } | |
2845 | ||
2846 | s.totalram >>= bitcount; | |
2847 | s.freeram >>= bitcount; | |
2848 | s.sharedram >>= bitcount; | |
2849 | s.bufferram >>= bitcount; | |
2850 | s.totalswap >>= bitcount; | |
2851 | s.freeswap >>= bitcount; | |
2852 | s.totalhigh >>= bitcount; | |
2853 | s.freehigh >>= bitcount; | |
2854 | } | |
2855 | ||
ce5155c4 AV |
2856 | memset(&s_32, 0, sizeof(s_32)); |
2857 | s_32.uptime = s.uptime; | |
2858 | s_32.loads[0] = s.loads[0]; | |
2859 | s_32.loads[1] = s.loads[1]; | |
2860 | s_32.loads[2] = s.loads[2]; | |
2861 | s_32.totalram = s.totalram; | |
2862 | s_32.freeram = s.freeram; | |
2863 | s_32.sharedram = s.sharedram; | |
2864 | s_32.bufferram = s.bufferram; | |
2865 | s_32.totalswap = s.totalswap; | |
2866 | s_32.freeswap = s.freeswap; | |
2867 | s_32.procs = s.procs; | |
2868 | s_32.totalhigh = s.totalhigh; | |
2869 | s_32.freehigh = s.freehigh; | |
2870 | s_32.mem_unit = s.mem_unit; | |
2871 | if (copy_to_user(info, &s_32, sizeof(s_32))) | |
4a22f166 | 2872 | return -EFAULT; |
4a22f166 SR |
2873 | return 0; |
2874 | } | |
2875 | #endif /* CONFIG_COMPAT */ |