Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/kernel/sys.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | */ | |
6 | ||
9984de1a | 7 | #include <linux/export.h> |
1da177e4 LT |
8 | #include <linux/mm.h> |
9 | #include <linux/utsname.h> | |
10 | #include <linux/mman.h> | |
1da177e4 LT |
11 | #include <linux/reboot.h> |
12 | #include <linux/prctl.h> | |
1da177e4 LT |
13 | #include <linux/highuid.h> |
14 | #include <linux/fs.h> | |
74da1ff7 | 15 | #include <linux/kmod.h> |
cdd6c482 | 16 | #include <linux/perf_event.h> |
3e88c553 | 17 | #include <linux/resource.h> |
dc009d92 EB |
18 | #include <linux/kernel.h> |
19 | #include <linux/kexec.h> | |
1da177e4 | 20 | #include <linux/workqueue.h> |
c59ede7b | 21 | #include <linux/capability.h> |
1da177e4 LT |
22 | #include <linux/device.h> |
23 | #include <linux/key.h> | |
24 | #include <linux/times.h> | |
25 | #include <linux/posix-timers.h> | |
26 | #include <linux/security.h> | |
27 | #include <linux/dcookies.h> | |
28 | #include <linux/suspend.h> | |
29 | #include <linux/tty.h> | |
7ed20e1a | 30 | #include <linux/signal.h> |
9f46080c | 31 | #include <linux/cn_proc.h> |
3cfc348b | 32 | #include <linux/getcpu.h> |
6eaeeaba | 33 | #include <linux/task_io_accounting_ops.h> |
1d9d02fe | 34 | #include <linux/seccomp.h> |
4047727e | 35 | #include <linux/cpu.h> |
e28cbf22 | 36 | #include <linux/personality.h> |
e3d5a27d | 37 | #include <linux/ptrace.h> |
5ad4e53b | 38 | #include <linux/fs_struct.h> |
b32dfe37 CG |
39 | #include <linux/file.h> |
40 | #include <linux/mount.h> | |
5a0e3ad6 | 41 | #include <linux/gfp.h> |
40dc166c | 42 | #include <linux/syscore_ops.h> |
be27425d AK |
43 | #include <linux/version.h> |
44 | #include <linux/ctype.h> | |
1da177e4 LT |
45 | |
46 | #include <linux/compat.h> | |
47 | #include <linux/syscalls.h> | |
00d7c05a | 48 | #include <linux/kprobes.h> |
acce292c | 49 | #include <linux/user_namespace.h> |
7fe5e042 | 50 | #include <linux/binfmts.h> |
1da177e4 | 51 | |
4a22f166 SR |
52 | #include <linux/sched.h> |
53 | #include <linux/rcupdate.h> | |
54 | #include <linux/uidgid.h> | |
55 | #include <linux/cred.h> | |
56 | ||
04c6862c | 57 | #include <linux/kmsg_dump.h> |
be27425d AK |
58 | /* Move somewhere else to avoid recompiling? */ |
59 | #include <generated/utsrelease.h> | |
04c6862c | 60 | |
1da177e4 LT |
61 | #include <asm/uaccess.h> |
62 | #include <asm/io.h> | |
63 | #include <asm/unistd.h> | |
64 | ||
65 | #ifndef SET_UNALIGN_CTL | |
66 | # define SET_UNALIGN_CTL(a,b) (-EINVAL) | |
67 | #endif | |
68 | #ifndef GET_UNALIGN_CTL | |
69 | # define GET_UNALIGN_CTL(a,b) (-EINVAL) | |
70 | #endif | |
71 | #ifndef SET_FPEMU_CTL | |
72 | # define SET_FPEMU_CTL(a,b) (-EINVAL) | |
73 | #endif | |
74 | #ifndef GET_FPEMU_CTL | |
75 | # define GET_FPEMU_CTL(a,b) (-EINVAL) | |
76 | #endif | |
77 | #ifndef SET_FPEXC_CTL | |
78 | # define SET_FPEXC_CTL(a,b) (-EINVAL) | |
79 | #endif | |
80 | #ifndef GET_FPEXC_CTL | |
81 | # define GET_FPEXC_CTL(a,b) (-EINVAL) | |
82 | #endif | |
651d765d AB |
83 | #ifndef GET_ENDIAN |
84 | # define GET_ENDIAN(a,b) (-EINVAL) | |
85 | #endif | |
86 | #ifndef SET_ENDIAN | |
87 | # define SET_ENDIAN(a,b) (-EINVAL) | |
88 | #endif | |
8fb402bc EB |
89 | #ifndef GET_TSC_CTL |
90 | # define GET_TSC_CTL(a) (-EINVAL) | |
91 | #endif | |
92 | #ifndef SET_TSC_CTL | |
93 | # define SET_TSC_CTL(a) (-EINVAL) | |
94 | #endif | |
1da177e4 LT |
95 | |
96 | /* | |
97 | * this is where the system-wide overflow UID and GID are defined, for | |
98 | * architectures that now have 32-bit UID/GID but didn't in the past | |
99 | */ | |
100 | ||
101 | int overflowuid = DEFAULT_OVERFLOWUID; | |
102 | int overflowgid = DEFAULT_OVERFLOWGID; | |
103 | ||
1da177e4 LT |
104 | EXPORT_SYMBOL(overflowuid); |
105 | EXPORT_SYMBOL(overflowgid); | |
1da177e4 LT |
106 | |
107 | /* | |
108 | * the same as above, but for filesystems which can only store a 16-bit | |
109 | * UID and GID. as such, this is needed on all architectures | |
110 | */ | |
111 | ||
112 | int fs_overflowuid = DEFAULT_FS_OVERFLOWUID; | |
113 | int fs_overflowgid = DEFAULT_FS_OVERFLOWUID; | |
114 | ||
115 | EXPORT_SYMBOL(fs_overflowuid); | |
116 | EXPORT_SYMBOL(fs_overflowgid); | |
117 | ||
fc832ad3 SH |
118 | /* |
119 | * Returns true if current's euid is same as p's uid or euid, | |
120 | * or has CAP_SYS_NICE to p's user_ns. | |
121 | * | |
122 | * Called with rcu_read_lock, creds are safe | |
123 | */ | |
124 | static bool set_one_prio_perm(struct task_struct *p) | |
125 | { | |
126 | const struct cred *cred = current_cred(), *pcred = __task_cred(p); | |
127 | ||
5af66203 EB |
128 | if (uid_eq(pcred->uid, cred->euid) || |
129 | uid_eq(pcred->euid, cred->euid)) | |
fc832ad3 | 130 | return true; |
c4a4d603 | 131 | if (ns_capable(pcred->user_ns, CAP_SYS_NICE)) |
fc832ad3 SH |
132 | return true; |
133 | return false; | |
134 | } | |
135 | ||
c69e8d9c DH |
136 | /* |
137 | * set the priority of a task | |
138 | * - the caller must hold the RCU read lock | |
139 | */ | |
1da177e4 LT |
140 | static int set_one_prio(struct task_struct *p, int niceval, int error) |
141 | { | |
142 | int no_nice; | |
143 | ||
fc832ad3 | 144 | if (!set_one_prio_perm(p)) { |
1da177e4 LT |
145 | error = -EPERM; |
146 | goto out; | |
147 | } | |
e43379f1 | 148 | if (niceval < task_nice(p) && !can_nice(p, niceval)) { |
1da177e4 LT |
149 | error = -EACCES; |
150 | goto out; | |
151 | } | |
152 | no_nice = security_task_setnice(p, niceval); | |
153 | if (no_nice) { | |
154 | error = no_nice; | |
155 | goto out; | |
156 | } | |
157 | if (error == -ESRCH) | |
158 | error = 0; | |
159 | set_user_nice(p, niceval); | |
160 | out: | |
161 | return error; | |
162 | } | |
163 | ||
754fe8d2 | 164 | SYSCALL_DEFINE3(setpriority, int, which, int, who, int, niceval) |
1da177e4 LT |
165 | { |
166 | struct task_struct *g, *p; | |
167 | struct user_struct *user; | |
86a264ab | 168 | const struct cred *cred = current_cred(); |
1da177e4 | 169 | int error = -EINVAL; |
41487c65 | 170 | struct pid *pgrp; |
7b44ab97 | 171 | kuid_t uid; |
1da177e4 | 172 | |
3e88c553 | 173 | if (which > PRIO_USER || which < PRIO_PROCESS) |
1da177e4 LT |
174 | goto out; |
175 | ||
176 | /* normalize: avoid signed division (rounding problems) */ | |
177 | error = -ESRCH; | |
178 | if (niceval < -20) | |
179 | niceval = -20; | |
180 | if (niceval > 19) | |
181 | niceval = 19; | |
182 | ||
d4581a23 | 183 | rcu_read_lock(); |
1da177e4 LT |
184 | read_lock(&tasklist_lock); |
185 | switch (which) { | |
186 | case PRIO_PROCESS: | |
41487c65 | 187 | if (who) |
228ebcbe | 188 | p = find_task_by_vpid(who); |
41487c65 EB |
189 | else |
190 | p = current; | |
1da177e4 LT |
191 | if (p) |
192 | error = set_one_prio(p, niceval, error); | |
193 | break; | |
194 | case PRIO_PGRP: | |
41487c65 | 195 | if (who) |
b488893a | 196 | pgrp = find_vpid(who); |
41487c65 EB |
197 | else |
198 | pgrp = task_pgrp(current); | |
2d70b68d | 199 | do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { |
1da177e4 | 200 | error = set_one_prio(p, niceval, error); |
2d70b68d | 201 | } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); |
1da177e4 LT |
202 | break; |
203 | case PRIO_USER: | |
7b44ab97 | 204 | uid = make_kuid(cred->user_ns, who); |
74ba508f | 205 | user = cred->user; |
1da177e4 | 206 | if (!who) |
078de5f7 EB |
207 | uid = cred->uid; |
208 | else if (!uid_eq(uid, cred->uid) && | |
7b44ab97 | 209 | !(user = find_user(uid))) |
86a264ab | 210 | goto out_unlock; /* No processes for this user */ |
1da177e4 | 211 | |
dfc6a736 | 212 | do_each_thread(g, p) { |
078de5f7 | 213 | if (uid_eq(task_uid(p), uid)) |
1da177e4 | 214 | error = set_one_prio(p, niceval, error); |
dfc6a736 | 215 | } while_each_thread(g, p); |
078de5f7 | 216 | if (!uid_eq(uid, cred->uid)) |
1da177e4 LT |
217 | free_uid(user); /* For find_user() */ |
218 | break; | |
219 | } | |
220 | out_unlock: | |
221 | read_unlock(&tasklist_lock); | |
d4581a23 | 222 | rcu_read_unlock(); |
1da177e4 LT |
223 | out: |
224 | return error; | |
225 | } | |
226 | ||
227 | /* | |
228 | * Ugh. To avoid negative return values, "getpriority()" will | |
229 | * not return the normal nice-value, but a negated value that | |
230 | * has been offset by 20 (ie it returns 40..1 instead of -20..19) | |
231 | * to stay compatible. | |
232 | */ | |
754fe8d2 | 233 | SYSCALL_DEFINE2(getpriority, int, which, int, who) |
1da177e4 LT |
234 | { |
235 | struct task_struct *g, *p; | |
236 | struct user_struct *user; | |
86a264ab | 237 | const struct cred *cred = current_cred(); |
1da177e4 | 238 | long niceval, retval = -ESRCH; |
41487c65 | 239 | struct pid *pgrp; |
7b44ab97 | 240 | kuid_t uid; |
1da177e4 | 241 | |
3e88c553 | 242 | if (which > PRIO_USER || which < PRIO_PROCESS) |
1da177e4 LT |
243 | return -EINVAL; |
244 | ||
70118837 | 245 | rcu_read_lock(); |
1da177e4 LT |
246 | read_lock(&tasklist_lock); |
247 | switch (which) { | |
248 | case PRIO_PROCESS: | |
41487c65 | 249 | if (who) |
228ebcbe | 250 | p = find_task_by_vpid(who); |
41487c65 EB |
251 | else |
252 | p = current; | |
1da177e4 LT |
253 | if (p) { |
254 | niceval = 20 - task_nice(p); | |
255 | if (niceval > retval) | |
256 | retval = niceval; | |
257 | } | |
258 | break; | |
259 | case PRIO_PGRP: | |
41487c65 | 260 | if (who) |
b488893a | 261 | pgrp = find_vpid(who); |
41487c65 EB |
262 | else |
263 | pgrp = task_pgrp(current); | |
2d70b68d | 264 | do_each_pid_thread(pgrp, PIDTYPE_PGID, p) { |
1da177e4 LT |
265 | niceval = 20 - task_nice(p); |
266 | if (niceval > retval) | |
267 | retval = niceval; | |
2d70b68d | 268 | } while_each_pid_thread(pgrp, PIDTYPE_PGID, p); |
1da177e4 LT |
269 | break; |
270 | case PRIO_USER: | |
7b44ab97 | 271 | uid = make_kuid(cred->user_ns, who); |
74ba508f | 272 | user = cred->user; |
1da177e4 | 273 | if (!who) |
078de5f7 EB |
274 | uid = cred->uid; |
275 | else if (!uid_eq(uid, cred->uid) && | |
7b44ab97 | 276 | !(user = find_user(uid))) |
86a264ab | 277 | goto out_unlock; /* No processes for this user */ |
1da177e4 | 278 | |
dfc6a736 | 279 | do_each_thread(g, p) { |
078de5f7 | 280 | if (uid_eq(task_uid(p), uid)) { |
1da177e4 LT |
281 | niceval = 20 - task_nice(p); |
282 | if (niceval > retval) | |
283 | retval = niceval; | |
284 | } | |
dfc6a736 | 285 | } while_each_thread(g, p); |
078de5f7 | 286 | if (!uid_eq(uid, cred->uid)) |
1da177e4 LT |
287 | free_uid(user); /* for find_user() */ |
288 | break; | |
289 | } | |
290 | out_unlock: | |
291 | read_unlock(&tasklist_lock); | |
70118837 | 292 | rcu_read_unlock(); |
1da177e4 LT |
293 | |
294 | return retval; | |
295 | } | |
296 | ||
1da177e4 LT |
297 | /* |
298 | * Unprivileged users may change the real gid to the effective gid | |
299 | * or vice versa. (BSD-style) | |
300 | * | |
301 | * If you set the real gid at all, or set the effective gid to a value not | |
302 | * equal to the real gid, then the saved gid is set to the new effective gid. | |
303 | * | |
304 | * This makes it possible for a setgid program to completely drop its | |
305 | * privileges, which is often a useful assertion to make when you are doing | |
306 | * a security audit over a program. | |
307 | * | |
308 | * The general idea is that a program which uses just setregid() will be | |
309 | * 100% compatible with BSD. A program which uses just setgid() will be | |
310 | * 100% compatible with POSIX with saved IDs. | |
311 | * | |
312 | * SMP: There are not races, the GIDs are checked only by filesystem | |
313 | * operations (as far as semantic preservation is concerned). | |
314 | */ | |
ae1251ab | 315 | SYSCALL_DEFINE2(setregid, gid_t, rgid, gid_t, egid) |
1da177e4 | 316 | { |
a29c33f4 | 317 | struct user_namespace *ns = current_user_ns(); |
d84f4f99 DH |
318 | const struct cred *old; |
319 | struct cred *new; | |
1da177e4 | 320 | int retval; |
a29c33f4 EB |
321 | kgid_t krgid, kegid; |
322 | ||
323 | krgid = make_kgid(ns, rgid); | |
324 | kegid = make_kgid(ns, egid); | |
325 | ||
326 | if ((rgid != (gid_t) -1) && !gid_valid(krgid)) | |
327 | return -EINVAL; | |
328 | if ((egid != (gid_t) -1) && !gid_valid(kegid)) | |
329 | return -EINVAL; | |
1da177e4 | 330 | |
d84f4f99 DH |
331 | new = prepare_creds(); |
332 | if (!new) | |
333 | return -ENOMEM; | |
334 | old = current_cred(); | |
335 | ||
d84f4f99 | 336 | retval = -EPERM; |
1da177e4 | 337 | if (rgid != (gid_t) -1) { |
a29c33f4 EB |
338 | if (gid_eq(old->gid, krgid) || |
339 | gid_eq(old->egid, krgid) || | |
c7b96acf | 340 | ns_capable(old->user_ns, CAP_SETGID)) |
a29c33f4 | 341 | new->gid = krgid; |
1da177e4 | 342 | else |
d84f4f99 | 343 | goto error; |
1da177e4 LT |
344 | } |
345 | if (egid != (gid_t) -1) { | |
a29c33f4 EB |
346 | if (gid_eq(old->gid, kegid) || |
347 | gid_eq(old->egid, kegid) || | |
348 | gid_eq(old->sgid, kegid) || | |
c7b96acf | 349 | ns_capable(old->user_ns, CAP_SETGID)) |
a29c33f4 | 350 | new->egid = kegid; |
756184b7 | 351 | else |
d84f4f99 | 352 | goto error; |
1da177e4 | 353 | } |
d84f4f99 | 354 | |
1da177e4 | 355 | if (rgid != (gid_t) -1 || |
a29c33f4 | 356 | (egid != (gid_t) -1 && !gid_eq(kegid, old->gid))) |
d84f4f99 DH |
357 | new->sgid = new->egid; |
358 | new->fsgid = new->egid; | |
359 | ||
360 | return commit_creds(new); | |
361 | ||
362 | error: | |
363 | abort_creds(new); | |
364 | return retval; | |
1da177e4 LT |
365 | } |
366 | ||
367 | /* | |
368 | * setgid() is implemented like SysV w/ SAVED_IDS | |
369 | * | |
370 | * SMP: Same implicit races as above. | |
371 | */ | |
ae1251ab | 372 | SYSCALL_DEFINE1(setgid, gid_t, gid) |
1da177e4 | 373 | { |
a29c33f4 | 374 | struct user_namespace *ns = current_user_ns(); |
d84f4f99 DH |
375 | const struct cred *old; |
376 | struct cred *new; | |
1da177e4 | 377 | int retval; |
a29c33f4 EB |
378 | kgid_t kgid; |
379 | ||
380 | kgid = make_kgid(ns, gid); | |
381 | if (!gid_valid(kgid)) | |
382 | return -EINVAL; | |
1da177e4 | 383 | |
d84f4f99 DH |
384 | new = prepare_creds(); |
385 | if (!new) | |
386 | return -ENOMEM; | |
387 | old = current_cred(); | |
388 | ||
d84f4f99 | 389 | retval = -EPERM; |
c7b96acf | 390 | if (ns_capable(old->user_ns, CAP_SETGID)) |
a29c33f4 EB |
391 | new->gid = new->egid = new->sgid = new->fsgid = kgid; |
392 | else if (gid_eq(kgid, old->gid) || gid_eq(kgid, old->sgid)) | |
393 | new->egid = new->fsgid = kgid; | |
1da177e4 | 394 | else |
d84f4f99 | 395 | goto error; |
1da177e4 | 396 | |
d84f4f99 DH |
397 | return commit_creds(new); |
398 | ||
399 | error: | |
400 | abort_creds(new); | |
401 | return retval; | |
1da177e4 | 402 | } |
54e99124 | 403 | |
d84f4f99 DH |
404 | /* |
405 | * change the user struct in a credentials set to match the new UID | |
406 | */ | |
407 | static int set_user(struct cred *new) | |
1da177e4 LT |
408 | { |
409 | struct user_struct *new_user; | |
410 | ||
078de5f7 | 411 | new_user = alloc_uid(new->uid); |
1da177e4 LT |
412 | if (!new_user) |
413 | return -EAGAIN; | |
414 | ||
72fa5997 VK |
415 | /* |
416 | * We don't fail in case of NPROC limit excess here because too many | |
417 | * poorly written programs don't check set*uid() return code, assuming | |
418 | * it never fails if called by root. We may still enforce NPROC limit | |
419 | * for programs doing set*uid()+execve() by harmlessly deferring the | |
420 | * failure to the execve() stage. | |
421 | */ | |
78d7d407 | 422 | if (atomic_read(&new_user->processes) >= rlimit(RLIMIT_NPROC) && |
72fa5997 VK |
423 | new_user != INIT_USER) |
424 | current->flags |= PF_NPROC_EXCEEDED; | |
425 | else | |
426 | current->flags &= ~PF_NPROC_EXCEEDED; | |
1da177e4 | 427 | |
d84f4f99 DH |
428 | free_uid(new->user); |
429 | new->user = new_user; | |
1da177e4 LT |
430 | return 0; |
431 | } | |
432 | ||
433 | /* | |
434 | * Unprivileged users may change the real uid to the effective uid | |
435 | * or vice versa. (BSD-style) | |
436 | * | |
437 | * If you set the real uid at all, or set the effective uid to a value not | |
438 | * equal to the real uid, then the saved uid is set to the new effective uid. | |
439 | * | |
440 | * This makes it possible for a setuid program to completely drop its | |
441 | * privileges, which is often a useful assertion to make when you are doing | |
442 | * a security audit over a program. | |
443 | * | |
444 | * The general idea is that a program which uses just setreuid() will be | |
445 | * 100% compatible with BSD. A program which uses just setuid() will be | |
446 | * 100% compatible with POSIX with saved IDs. | |
447 | */ | |
ae1251ab | 448 | SYSCALL_DEFINE2(setreuid, uid_t, ruid, uid_t, euid) |
1da177e4 | 449 | { |
a29c33f4 | 450 | struct user_namespace *ns = current_user_ns(); |
d84f4f99 DH |
451 | const struct cred *old; |
452 | struct cred *new; | |
1da177e4 | 453 | int retval; |
a29c33f4 EB |
454 | kuid_t kruid, keuid; |
455 | ||
456 | kruid = make_kuid(ns, ruid); | |
457 | keuid = make_kuid(ns, euid); | |
458 | ||
459 | if ((ruid != (uid_t) -1) && !uid_valid(kruid)) | |
460 | return -EINVAL; | |
461 | if ((euid != (uid_t) -1) && !uid_valid(keuid)) | |
462 | return -EINVAL; | |
1da177e4 | 463 | |
d84f4f99 DH |
464 | new = prepare_creds(); |
465 | if (!new) | |
466 | return -ENOMEM; | |
467 | old = current_cred(); | |
468 | ||
d84f4f99 | 469 | retval = -EPERM; |
1da177e4 | 470 | if (ruid != (uid_t) -1) { |
a29c33f4 EB |
471 | new->uid = kruid; |
472 | if (!uid_eq(old->uid, kruid) && | |
473 | !uid_eq(old->euid, kruid) && | |
c7b96acf | 474 | !ns_capable(old->user_ns, CAP_SETUID)) |
d84f4f99 | 475 | goto error; |
1da177e4 LT |
476 | } |
477 | ||
478 | if (euid != (uid_t) -1) { | |
a29c33f4 EB |
479 | new->euid = keuid; |
480 | if (!uid_eq(old->uid, keuid) && | |
481 | !uid_eq(old->euid, keuid) && | |
482 | !uid_eq(old->suid, keuid) && | |
c7b96acf | 483 | !ns_capable(old->user_ns, CAP_SETUID)) |
d84f4f99 | 484 | goto error; |
1da177e4 LT |
485 | } |
486 | ||
a29c33f4 | 487 | if (!uid_eq(new->uid, old->uid)) { |
54e99124 DG |
488 | retval = set_user(new); |
489 | if (retval < 0) | |
490 | goto error; | |
491 | } | |
1da177e4 | 492 | if (ruid != (uid_t) -1 || |
a29c33f4 | 493 | (euid != (uid_t) -1 && !uid_eq(keuid, old->uid))) |
d84f4f99 DH |
494 | new->suid = new->euid; |
495 | new->fsuid = new->euid; | |
1da177e4 | 496 | |
d84f4f99 DH |
497 | retval = security_task_fix_setuid(new, old, LSM_SETID_RE); |
498 | if (retval < 0) | |
499 | goto error; | |
1da177e4 | 500 | |
d84f4f99 | 501 | return commit_creds(new); |
1da177e4 | 502 | |
d84f4f99 DH |
503 | error: |
504 | abort_creds(new); | |
505 | return retval; | |
506 | } | |
1da177e4 LT |
507 | |
508 | /* | |
509 | * setuid() is implemented like SysV with SAVED_IDS | |
510 | * | |
511 | * Note that SAVED_ID's is deficient in that a setuid root program | |
512 | * like sendmail, for example, cannot set its uid to be a normal | |
513 | * user and then switch back, because if you're root, setuid() sets | |
514 | * the saved uid too. If you don't like this, blame the bright people | |
515 | * in the POSIX committee and/or USG. Note that the BSD-style setreuid() | |
516 | * will allow a root program to temporarily drop privileges and be able to | |
517 | * regain them by swapping the real and effective uid. | |
518 | */ | |
ae1251ab | 519 | SYSCALL_DEFINE1(setuid, uid_t, uid) |
1da177e4 | 520 | { |
a29c33f4 | 521 | struct user_namespace *ns = current_user_ns(); |
d84f4f99 DH |
522 | const struct cred *old; |
523 | struct cred *new; | |
1da177e4 | 524 | int retval; |
a29c33f4 EB |
525 | kuid_t kuid; |
526 | ||
527 | kuid = make_kuid(ns, uid); | |
528 | if (!uid_valid(kuid)) | |
529 | return -EINVAL; | |
1da177e4 | 530 | |
d84f4f99 DH |
531 | new = prepare_creds(); |
532 | if (!new) | |
533 | return -ENOMEM; | |
534 | old = current_cred(); | |
535 | ||
d84f4f99 | 536 | retval = -EPERM; |
c7b96acf | 537 | if (ns_capable(old->user_ns, CAP_SETUID)) { |
a29c33f4 EB |
538 | new->suid = new->uid = kuid; |
539 | if (!uid_eq(kuid, old->uid)) { | |
54e99124 DG |
540 | retval = set_user(new); |
541 | if (retval < 0) | |
542 | goto error; | |
d84f4f99 | 543 | } |
a29c33f4 | 544 | } else if (!uid_eq(kuid, old->uid) && !uid_eq(kuid, new->suid)) { |
d84f4f99 | 545 | goto error; |
1da177e4 | 546 | } |
1da177e4 | 547 | |
a29c33f4 | 548 | new->fsuid = new->euid = kuid; |
d84f4f99 DH |
549 | |
550 | retval = security_task_fix_setuid(new, old, LSM_SETID_ID); | |
551 | if (retval < 0) | |
552 | goto error; | |
1da177e4 | 553 | |
d84f4f99 | 554 | return commit_creds(new); |
1da177e4 | 555 | |
d84f4f99 DH |
556 | error: |
557 | abort_creds(new); | |
558 | return retval; | |
1da177e4 LT |
559 | } |
560 | ||
561 | ||
562 | /* | |
563 | * This function implements a generic ability to update ruid, euid, | |
564 | * and suid. This allows you to implement the 4.4 compatible seteuid(). | |
565 | */ | |
ae1251ab | 566 | SYSCALL_DEFINE3(setresuid, uid_t, ruid, uid_t, euid, uid_t, suid) |
1da177e4 | 567 | { |
a29c33f4 | 568 | struct user_namespace *ns = current_user_ns(); |
d84f4f99 DH |
569 | const struct cred *old; |
570 | struct cred *new; | |
1da177e4 | 571 | int retval; |
a29c33f4 EB |
572 | kuid_t kruid, keuid, ksuid; |
573 | ||
574 | kruid = make_kuid(ns, ruid); | |
575 | keuid = make_kuid(ns, euid); | |
576 | ksuid = make_kuid(ns, suid); | |
577 | ||
578 | if ((ruid != (uid_t) -1) && !uid_valid(kruid)) | |
579 | return -EINVAL; | |
580 | ||
581 | if ((euid != (uid_t) -1) && !uid_valid(keuid)) | |
582 | return -EINVAL; | |
583 | ||
584 | if ((suid != (uid_t) -1) && !uid_valid(ksuid)) | |
585 | return -EINVAL; | |
1da177e4 | 586 | |
d84f4f99 DH |
587 | new = prepare_creds(); |
588 | if (!new) | |
589 | return -ENOMEM; | |
590 | ||
d84f4f99 | 591 | old = current_cred(); |
1da177e4 | 592 | |
d84f4f99 | 593 | retval = -EPERM; |
c7b96acf | 594 | if (!ns_capable(old->user_ns, CAP_SETUID)) { |
a29c33f4 EB |
595 | if (ruid != (uid_t) -1 && !uid_eq(kruid, old->uid) && |
596 | !uid_eq(kruid, old->euid) && !uid_eq(kruid, old->suid)) | |
d84f4f99 | 597 | goto error; |
a29c33f4 EB |
598 | if (euid != (uid_t) -1 && !uid_eq(keuid, old->uid) && |
599 | !uid_eq(keuid, old->euid) && !uid_eq(keuid, old->suid)) | |
d84f4f99 | 600 | goto error; |
a29c33f4 EB |
601 | if (suid != (uid_t) -1 && !uid_eq(ksuid, old->uid) && |
602 | !uid_eq(ksuid, old->euid) && !uid_eq(ksuid, old->suid)) | |
d84f4f99 | 603 | goto error; |
1da177e4 | 604 | } |
d84f4f99 | 605 | |
1da177e4 | 606 | if (ruid != (uid_t) -1) { |
a29c33f4 EB |
607 | new->uid = kruid; |
608 | if (!uid_eq(kruid, old->uid)) { | |
54e99124 DG |
609 | retval = set_user(new); |
610 | if (retval < 0) | |
611 | goto error; | |
612 | } | |
1da177e4 | 613 | } |
d84f4f99 | 614 | if (euid != (uid_t) -1) |
a29c33f4 | 615 | new->euid = keuid; |
1da177e4 | 616 | if (suid != (uid_t) -1) |
a29c33f4 | 617 | new->suid = ksuid; |
d84f4f99 | 618 | new->fsuid = new->euid; |
1da177e4 | 619 | |
d84f4f99 DH |
620 | retval = security_task_fix_setuid(new, old, LSM_SETID_RES); |
621 | if (retval < 0) | |
622 | goto error; | |
1da177e4 | 623 | |
d84f4f99 | 624 | return commit_creds(new); |
1da177e4 | 625 | |
d84f4f99 DH |
626 | error: |
627 | abort_creds(new); | |
628 | return retval; | |
1da177e4 LT |
629 | } |
630 | ||
a29c33f4 | 631 | SYSCALL_DEFINE3(getresuid, uid_t __user *, ruidp, uid_t __user *, euidp, uid_t __user *, suidp) |
1da177e4 | 632 | { |
86a264ab | 633 | const struct cred *cred = current_cred(); |
1da177e4 | 634 | int retval; |
a29c33f4 EB |
635 | uid_t ruid, euid, suid; |
636 | ||
637 | ruid = from_kuid_munged(cred->user_ns, cred->uid); | |
638 | euid = from_kuid_munged(cred->user_ns, cred->euid); | |
639 | suid = from_kuid_munged(cred->user_ns, cred->suid); | |
1da177e4 | 640 | |
a29c33f4 EB |
641 | if (!(retval = put_user(ruid, ruidp)) && |
642 | !(retval = put_user(euid, euidp))) | |
643 | retval = put_user(suid, suidp); | |
1da177e4 LT |
644 | |
645 | return retval; | |
646 | } | |
647 | ||
648 | /* | |
649 | * Same as above, but for rgid, egid, sgid. | |
650 | */ | |
ae1251ab | 651 | SYSCALL_DEFINE3(setresgid, gid_t, rgid, gid_t, egid, gid_t, sgid) |
1da177e4 | 652 | { |
a29c33f4 | 653 | struct user_namespace *ns = current_user_ns(); |
d84f4f99 DH |
654 | const struct cred *old; |
655 | struct cred *new; | |
1da177e4 | 656 | int retval; |
a29c33f4 EB |
657 | kgid_t krgid, kegid, ksgid; |
658 | ||
659 | krgid = make_kgid(ns, rgid); | |
660 | kegid = make_kgid(ns, egid); | |
661 | ksgid = make_kgid(ns, sgid); | |
662 | ||
663 | if ((rgid != (gid_t) -1) && !gid_valid(krgid)) | |
664 | return -EINVAL; | |
665 | if ((egid != (gid_t) -1) && !gid_valid(kegid)) | |
666 | return -EINVAL; | |
667 | if ((sgid != (gid_t) -1) && !gid_valid(ksgid)) | |
668 | return -EINVAL; | |
1da177e4 | 669 | |
d84f4f99 DH |
670 | new = prepare_creds(); |
671 | if (!new) | |
672 | return -ENOMEM; | |
673 | old = current_cred(); | |
674 | ||
d84f4f99 | 675 | retval = -EPERM; |
c7b96acf | 676 | if (!ns_capable(old->user_ns, CAP_SETGID)) { |
a29c33f4 EB |
677 | if (rgid != (gid_t) -1 && !gid_eq(krgid, old->gid) && |
678 | !gid_eq(krgid, old->egid) && !gid_eq(krgid, old->sgid)) | |
d84f4f99 | 679 | goto error; |
a29c33f4 EB |
680 | if (egid != (gid_t) -1 && !gid_eq(kegid, old->gid) && |
681 | !gid_eq(kegid, old->egid) && !gid_eq(kegid, old->sgid)) | |
d84f4f99 | 682 | goto error; |
a29c33f4 EB |
683 | if (sgid != (gid_t) -1 && !gid_eq(ksgid, old->gid) && |
684 | !gid_eq(ksgid, old->egid) && !gid_eq(ksgid, old->sgid)) | |
d84f4f99 | 685 | goto error; |
1da177e4 | 686 | } |
d84f4f99 | 687 | |
1da177e4 | 688 | if (rgid != (gid_t) -1) |
a29c33f4 | 689 | new->gid = krgid; |
d84f4f99 | 690 | if (egid != (gid_t) -1) |
a29c33f4 | 691 | new->egid = kegid; |
1da177e4 | 692 | if (sgid != (gid_t) -1) |
a29c33f4 | 693 | new->sgid = ksgid; |
d84f4f99 | 694 | new->fsgid = new->egid; |
1da177e4 | 695 | |
d84f4f99 DH |
696 | return commit_creds(new); |
697 | ||
698 | error: | |
699 | abort_creds(new); | |
700 | return retval; | |
1da177e4 LT |
701 | } |
702 | ||
a29c33f4 | 703 | SYSCALL_DEFINE3(getresgid, gid_t __user *, rgidp, gid_t __user *, egidp, gid_t __user *, sgidp) |
1da177e4 | 704 | { |
86a264ab | 705 | const struct cred *cred = current_cred(); |
1da177e4 | 706 | int retval; |
a29c33f4 EB |
707 | gid_t rgid, egid, sgid; |
708 | ||
709 | rgid = from_kgid_munged(cred->user_ns, cred->gid); | |
710 | egid = from_kgid_munged(cred->user_ns, cred->egid); | |
711 | sgid = from_kgid_munged(cred->user_ns, cred->sgid); | |
1da177e4 | 712 | |
a29c33f4 EB |
713 | if (!(retval = put_user(rgid, rgidp)) && |
714 | !(retval = put_user(egid, egidp))) | |
715 | retval = put_user(sgid, sgidp); | |
1da177e4 LT |
716 | |
717 | return retval; | |
718 | } | |
719 | ||
720 | ||
721 | /* | |
722 | * "setfsuid()" sets the fsuid - the uid used for filesystem checks. This | |
723 | * is used for "access()" and for the NFS daemon (letting nfsd stay at | |
724 | * whatever uid it wants to). It normally shadows "euid", except when | |
725 | * explicitly set by setfsuid() or for access.. | |
726 | */ | |
ae1251ab | 727 | SYSCALL_DEFINE1(setfsuid, uid_t, uid) |
1da177e4 | 728 | { |
d84f4f99 DH |
729 | const struct cred *old; |
730 | struct cred *new; | |
731 | uid_t old_fsuid; | |
a29c33f4 EB |
732 | kuid_t kuid; |
733 | ||
734 | old = current_cred(); | |
735 | old_fsuid = from_kuid_munged(old->user_ns, old->fsuid); | |
736 | ||
737 | kuid = make_kuid(old->user_ns, uid); | |
738 | if (!uid_valid(kuid)) | |
739 | return old_fsuid; | |
1da177e4 | 740 | |
d84f4f99 DH |
741 | new = prepare_creds(); |
742 | if (!new) | |
a29c33f4 | 743 | return old_fsuid; |
1da177e4 | 744 | |
a29c33f4 EB |
745 | if (uid_eq(kuid, old->uid) || uid_eq(kuid, old->euid) || |
746 | uid_eq(kuid, old->suid) || uid_eq(kuid, old->fsuid) || | |
c7b96acf | 747 | ns_capable(old->user_ns, CAP_SETUID)) { |
a29c33f4 EB |
748 | if (!uid_eq(kuid, old->fsuid)) { |
749 | new->fsuid = kuid; | |
d84f4f99 DH |
750 | if (security_task_fix_setuid(new, old, LSM_SETID_FS) == 0) |
751 | goto change_okay; | |
1da177e4 | 752 | } |
1da177e4 LT |
753 | } |
754 | ||
d84f4f99 DH |
755 | abort_creds(new); |
756 | return old_fsuid; | |
1da177e4 | 757 | |
d84f4f99 DH |
758 | change_okay: |
759 | commit_creds(new); | |
1da177e4 LT |
760 | return old_fsuid; |
761 | } | |
762 | ||
763 | /* | |
f42df9e6 | 764 | * Samma på svenska.. |
1da177e4 | 765 | */ |
ae1251ab | 766 | SYSCALL_DEFINE1(setfsgid, gid_t, gid) |
1da177e4 | 767 | { |
d84f4f99 DH |
768 | const struct cred *old; |
769 | struct cred *new; | |
770 | gid_t old_fsgid; | |
a29c33f4 EB |
771 | kgid_t kgid; |
772 | ||
773 | old = current_cred(); | |
774 | old_fsgid = from_kgid_munged(old->user_ns, old->fsgid); | |
775 | ||
776 | kgid = make_kgid(old->user_ns, gid); | |
777 | if (!gid_valid(kgid)) | |
778 | return old_fsgid; | |
d84f4f99 DH |
779 | |
780 | new = prepare_creds(); | |
781 | if (!new) | |
a29c33f4 | 782 | return old_fsgid; |
1da177e4 | 783 | |
a29c33f4 EB |
784 | if (gid_eq(kgid, old->gid) || gid_eq(kgid, old->egid) || |
785 | gid_eq(kgid, old->sgid) || gid_eq(kgid, old->fsgid) || | |
c7b96acf | 786 | ns_capable(old->user_ns, CAP_SETGID)) { |
a29c33f4 EB |
787 | if (!gid_eq(kgid, old->fsgid)) { |
788 | new->fsgid = kgid; | |
d84f4f99 | 789 | goto change_okay; |
1da177e4 | 790 | } |
1da177e4 | 791 | } |
d84f4f99 | 792 | |
d84f4f99 DH |
793 | abort_creds(new); |
794 | return old_fsgid; | |
795 | ||
796 | change_okay: | |
797 | commit_creds(new); | |
1da177e4 LT |
798 | return old_fsgid; |
799 | } | |
800 | ||
4a22f166 SR |
801 | /** |
802 | * sys_getpid - return the thread group id of the current process | |
803 | * | |
804 | * Note, despite the name, this returns the tgid not the pid. The tgid and | |
805 | * the pid are identical unless CLONE_THREAD was specified on clone() in | |
806 | * which case the tgid is the same in all threads of the same group. | |
807 | * | |
808 | * This is SMP safe as current->tgid does not change. | |
809 | */ | |
810 | SYSCALL_DEFINE0(getpid) | |
811 | { | |
812 | return task_tgid_vnr(current); | |
813 | } | |
814 | ||
815 | /* Thread ID - the internal kernel "pid" */ | |
816 | SYSCALL_DEFINE0(gettid) | |
817 | { | |
818 | return task_pid_vnr(current); | |
819 | } | |
820 | ||
821 | /* | |
822 | * Accessing ->real_parent is not SMP-safe, it could | |
823 | * change from under us. However, we can use a stale | |
824 | * value of ->real_parent under rcu_read_lock(), see | |
825 | * release_task()->call_rcu(delayed_put_task_struct). | |
826 | */ | |
827 | SYSCALL_DEFINE0(getppid) | |
828 | { | |
829 | int pid; | |
830 | ||
831 | rcu_read_lock(); | |
832 | pid = task_tgid_vnr(rcu_dereference(current->real_parent)); | |
833 | rcu_read_unlock(); | |
834 | ||
835 | return pid; | |
836 | } | |
837 | ||
838 | SYSCALL_DEFINE0(getuid) | |
839 | { | |
840 | /* Only we change this so SMP safe */ | |
841 | return from_kuid_munged(current_user_ns(), current_uid()); | |
842 | } | |
843 | ||
844 | SYSCALL_DEFINE0(geteuid) | |
845 | { | |
846 | /* Only we change this so SMP safe */ | |
847 | return from_kuid_munged(current_user_ns(), current_euid()); | |
848 | } | |
849 | ||
850 | SYSCALL_DEFINE0(getgid) | |
851 | { | |
852 | /* Only we change this so SMP safe */ | |
853 | return from_kgid_munged(current_user_ns(), current_gid()); | |
854 | } | |
855 | ||
856 | SYSCALL_DEFINE0(getegid) | |
857 | { | |
858 | /* Only we change this so SMP safe */ | |
859 | return from_kgid_munged(current_user_ns(), current_egid()); | |
860 | } | |
861 | ||
f06febc9 FM |
862 | void do_sys_times(struct tms *tms) |
863 | { | |
0cf55e1e | 864 | cputime_t tgutime, tgstime, cutime, cstime; |
f06febc9 | 865 | |
2b5fe6de | 866 | spin_lock_irq(¤t->sighand->siglock); |
e80d0a1a | 867 | thread_group_cputime_adjusted(current, &tgutime, &tgstime); |
f06febc9 FM |
868 | cutime = current->signal->cutime; |
869 | cstime = current->signal->cstime; | |
870 | spin_unlock_irq(¤t->sighand->siglock); | |
0cf55e1e HS |
871 | tms->tms_utime = cputime_to_clock_t(tgutime); |
872 | tms->tms_stime = cputime_to_clock_t(tgstime); | |
f06febc9 FM |
873 | tms->tms_cutime = cputime_to_clock_t(cutime); |
874 | tms->tms_cstime = cputime_to_clock_t(cstime); | |
875 | } | |
876 | ||
58fd3aa2 | 877 | SYSCALL_DEFINE1(times, struct tms __user *, tbuf) |
1da177e4 | 878 | { |
1da177e4 LT |
879 | if (tbuf) { |
880 | struct tms tmp; | |
f06febc9 FM |
881 | |
882 | do_sys_times(&tmp); | |
1da177e4 LT |
883 | if (copy_to_user(tbuf, &tmp, sizeof(struct tms))) |
884 | return -EFAULT; | |
885 | } | |
e3d5a27d | 886 | force_successful_syscall_return(); |
1da177e4 LT |
887 | return (long) jiffies_64_to_clock_t(get_jiffies_64()); |
888 | } | |
889 | ||
890 | /* | |
891 | * This needs some heavy checking ... | |
892 | * I just haven't the stomach for it. I also don't fully | |
893 | * understand sessions/pgrp etc. Let somebody who does explain it. | |
894 | * | |
895 | * OK, I think I have the protection semantics right.... this is really | |
896 | * only important on a multi-user system anyway, to make sure one user | |
897 | * can't send a signal to a process owned by another. -TYT, 12/12/91 | |
898 | * | |
899 | * Auch. Had to add the 'did_exec' flag to conform completely to POSIX. | |
900 | * LBT 04.03.94 | |
901 | */ | |
b290ebe2 | 902 | SYSCALL_DEFINE2(setpgid, pid_t, pid, pid_t, pgid) |
1da177e4 LT |
903 | { |
904 | struct task_struct *p; | |
ee0acf90 | 905 | struct task_struct *group_leader = current->group_leader; |
4e021306 ON |
906 | struct pid *pgrp; |
907 | int err; | |
1da177e4 LT |
908 | |
909 | if (!pid) | |
b488893a | 910 | pid = task_pid_vnr(group_leader); |
1da177e4 LT |
911 | if (!pgid) |
912 | pgid = pid; | |
913 | if (pgid < 0) | |
914 | return -EINVAL; | |
950eaaca | 915 | rcu_read_lock(); |
1da177e4 LT |
916 | |
917 | /* From this point forward we keep holding onto the tasklist lock | |
918 | * so that our parent does not change from under us. -DaveM | |
919 | */ | |
920 | write_lock_irq(&tasklist_lock); | |
921 | ||
922 | err = -ESRCH; | |
4e021306 | 923 | p = find_task_by_vpid(pid); |
1da177e4 LT |
924 | if (!p) |
925 | goto out; | |
926 | ||
927 | err = -EINVAL; | |
928 | if (!thread_group_leader(p)) | |
929 | goto out; | |
930 | ||
4e021306 | 931 | if (same_thread_group(p->real_parent, group_leader)) { |
1da177e4 | 932 | err = -EPERM; |
41487c65 | 933 | if (task_session(p) != task_session(group_leader)) |
1da177e4 LT |
934 | goto out; |
935 | err = -EACCES; | |
936 | if (p->did_exec) | |
937 | goto out; | |
938 | } else { | |
939 | err = -ESRCH; | |
ee0acf90 | 940 | if (p != group_leader) |
1da177e4 LT |
941 | goto out; |
942 | } | |
943 | ||
944 | err = -EPERM; | |
945 | if (p->signal->leader) | |
946 | goto out; | |
947 | ||
4e021306 | 948 | pgrp = task_pid(p); |
1da177e4 | 949 | if (pgid != pid) { |
b488893a | 950 | struct task_struct *g; |
1da177e4 | 951 | |
4e021306 ON |
952 | pgrp = find_vpid(pgid); |
953 | g = pid_task(pgrp, PIDTYPE_PGID); | |
41487c65 | 954 | if (!g || task_session(g) != task_session(group_leader)) |
f020bc46 | 955 | goto out; |
1da177e4 LT |
956 | } |
957 | ||
1da177e4 LT |
958 | err = security_task_setpgid(p, pgid); |
959 | if (err) | |
960 | goto out; | |
961 | ||
1b0f7ffd | 962 | if (task_pgrp(p) != pgrp) |
83beaf3c | 963 | change_pid(p, PIDTYPE_PGID, pgrp); |
1da177e4 LT |
964 | |
965 | err = 0; | |
966 | out: | |
967 | /* All paths lead to here, thus we are safe. -DaveM */ | |
968 | write_unlock_irq(&tasklist_lock); | |
950eaaca | 969 | rcu_read_unlock(); |
1da177e4 LT |
970 | return err; |
971 | } | |
972 | ||
dbf040d9 | 973 | SYSCALL_DEFINE1(getpgid, pid_t, pid) |
1da177e4 | 974 | { |
12a3de0a ON |
975 | struct task_struct *p; |
976 | struct pid *grp; | |
977 | int retval; | |
978 | ||
979 | rcu_read_lock(); | |
756184b7 | 980 | if (!pid) |
12a3de0a | 981 | grp = task_pgrp(current); |
756184b7 | 982 | else { |
1da177e4 | 983 | retval = -ESRCH; |
12a3de0a ON |
984 | p = find_task_by_vpid(pid); |
985 | if (!p) | |
986 | goto out; | |
987 | grp = task_pgrp(p); | |
988 | if (!grp) | |
989 | goto out; | |
990 | ||
991 | retval = security_task_getpgid(p); | |
992 | if (retval) | |
993 | goto out; | |
1da177e4 | 994 | } |
12a3de0a ON |
995 | retval = pid_vnr(grp); |
996 | out: | |
997 | rcu_read_unlock(); | |
998 | return retval; | |
1da177e4 LT |
999 | } |
1000 | ||
1001 | #ifdef __ARCH_WANT_SYS_GETPGRP | |
1002 | ||
dbf040d9 | 1003 | SYSCALL_DEFINE0(getpgrp) |
1da177e4 | 1004 | { |
12a3de0a | 1005 | return sys_getpgid(0); |
1da177e4 LT |
1006 | } |
1007 | ||
1008 | #endif | |
1009 | ||
dbf040d9 | 1010 | SYSCALL_DEFINE1(getsid, pid_t, pid) |
1da177e4 | 1011 | { |
1dd768c0 ON |
1012 | struct task_struct *p; |
1013 | struct pid *sid; | |
1014 | int retval; | |
1015 | ||
1016 | rcu_read_lock(); | |
756184b7 | 1017 | if (!pid) |
1dd768c0 | 1018 | sid = task_session(current); |
756184b7 | 1019 | else { |
1da177e4 | 1020 | retval = -ESRCH; |
1dd768c0 ON |
1021 | p = find_task_by_vpid(pid); |
1022 | if (!p) | |
1023 | goto out; | |
1024 | sid = task_session(p); | |
1025 | if (!sid) | |
1026 | goto out; | |
1027 | ||
1028 | retval = security_task_getsid(p); | |
1029 | if (retval) | |
1030 | goto out; | |
1da177e4 | 1031 | } |
1dd768c0 ON |
1032 | retval = pid_vnr(sid); |
1033 | out: | |
1034 | rcu_read_unlock(); | |
1035 | return retval; | |
1da177e4 LT |
1036 | } |
1037 | ||
81dabb46 ON |
1038 | static void set_special_pids(struct pid *pid) |
1039 | { | |
1040 | struct task_struct *curr = current->group_leader; | |
1041 | ||
1042 | if (task_session(curr) != pid) | |
1043 | change_pid(curr, PIDTYPE_SID, pid); | |
1044 | ||
1045 | if (task_pgrp(curr) != pid) | |
1046 | change_pid(curr, PIDTYPE_PGID, pid); | |
1047 | } | |
1048 | ||
b290ebe2 | 1049 | SYSCALL_DEFINE0(setsid) |
1da177e4 | 1050 | { |
e19f247a | 1051 | struct task_struct *group_leader = current->group_leader; |
e4cc0a9c ON |
1052 | struct pid *sid = task_pid(group_leader); |
1053 | pid_t session = pid_vnr(sid); | |
1da177e4 LT |
1054 | int err = -EPERM; |
1055 | ||
1da177e4 | 1056 | write_lock_irq(&tasklist_lock); |
390e2ff0 EB |
1057 | /* Fail if I am already a session leader */ |
1058 | if (group_leader->signal->leader) | |
1059 | goto out; | |
1060 | ||
430c6231 ON |
1061 | /* Fail if a process group id already exists that equals the |
1062 | * proposed session id. | |
390e2ff0 | 1063 | */ |
6806aac6 | 1064 | if (pid_task(sid, PIDTYPE_PGID)) |
1da177e4 LT |
1065 | goto out; |
1066 | ||
e19f247a | 1067 | group_leader->signal->leader = 1; |
81dabb46 | 1068 | set_special_pids(sid); |
24ec839c | 1069 | |
9c9f4ded | 1070 | proc_clear_tty(group_leader); |
24ec839c | 1071 | |
e4cc0a9c | 1072 | err = session; |
1da177e4 LT |
1073 | out: |
1074 | write_unlock_irq(&tasklist_lock); | |
5091faa4 | 1075 | if (err > 0) { |
0d0df599 | 1076 | proc_sid_connector(group_leader); |
5091faa4 MG |
1077 | sched_autogroup_create_attach(group_leader); |
1078 | } | |
1da177e4 LT |
1079 | return err; |
1080 | } | |
1081 | ||
1da177e4 LT |
1082 | DECLARE_RWSEM(uts_sem); |
1083 | ||
e28cbf22 CH |
1084 | #ifdef COMPAT_UTS_MACHINE |
1085 | #define override_architecture(name) \ | |
46da2766 | 1086 | (personality(current->personality) == PER_LINUX32 && \ |
e28cbf22 CH |
1087 | copy_to_user(name->machine, COMPAT_UTS_MACHINE, \ |
1088 | sizeof(COMPAT_UTS_MACHINE))) | |
1089 | #else | |
1090 | #define override_architecture(name) 0 | |
1091 | #endif | |
1092 | ||
be27425d AK |
1093 | /* |
1094 | * Work around broken programs that cannot handle "Linux 3.0". | |
1095 | * Instead we map 3.x to 2.6.40+x, so e.g. 3.0 would be 2.6.40 | |
1096 | */ | |
2702b152 | 1097 | static int override_release(char __user *release, size_t len) |
be27425d AK |
1098 | { |
1099 | int ret = 0; | |
be27425d AK |
1100 | |
1101 | if (current->personality & UNAME26) { | |
2702b152 KC |
1102 | const char *rest = UTS_RELEASE; |
1103 | char buf[65] = { 0 }; | |
be27425d AK |
1104 | int ndots = 0; |
1105 | unsigned v; | |
2702b152 | 1106 | size_t copy; |
be27425d AK |
1107 | |
1108 | while (*rest) { | |
1109 | if (*rest == '.' && ++ndots >= 3) | |
1110 | break; | |
1111 | if (!isdigit(*rest) && *rest != '.') | |
1112 | break; | |
1113 | rest++; | |
1114 | } | |
1115 | v = ((LINUX_VERSION_CODE >> 8) & 0xff) + 40; | |
31fd84b9 | 1116 | copy = clamp_t(size_t, len, 1, sizeof(buf)); |
2702b152 KC |
1117 | copy = scnprintf(buf, copy, "2.6.%u%s", v, rest); |
1118 | ret = copy_to_user(release, buf, copy + 1); | |
be27425d AK |
1119 | } |
1120 | return ret; | |
1121 | } | |
1122 | ||
e48fbb69 | 1123 | SYSCALL_DEFINE1(newuname, struct new_utsname __user *, name) |
1da177e4 LT |
1124 | { |
1125 | int errno = 0; | |
1126 | ||
1127 | down_read(&uts_sem); | |
e9ff3990 | 1128 | if (copy_to_user(name, utsname(), sizeof *name)) |
1da177e4 LT |
1129 | errno = -EFAULT; |
1130 | up_read(&uts_sem); | |
e28cbf22 | 1131 | |
be27425d AK |
1132 | if (!errno && override_release(name->release, sizeof(name->release))) |
1133 | errno = -EFAULT; | |
e28cbf22 CH |
1134 | if (!errno && override_architecture(name)) |
1135 | errno = -EFAULT; | |
1da177e4 LT |
1136 | return errno; |
1137 | } | |
1138 | ||
5cacdb4a CH |
1139 | #ifdef __ARCH_WANT_SYS_OLD_UNAME |
1140 | /* | |
1141 | * Old cruft | |
1142 | */ | |
1143 | SYSCALL_DEFINE1(uname, struct old_utsname __user *, name) | |
1144 | { | |
1145 | int error = 0; | |
1146 | ||
1147 | if (!name) | |
1148 | return -EFAULT; | |
1149 | ||
1150 | down_read(&uts_sem); | |
1151 | if (copy_to_user(name, utsname(), sizeof(*name))) | |
1152 | error = -EFAULT; | |
1153 | up_read(&uts_sem); | |
1154 | ||
be27425d AK |
1155 | if (!error && override_release(name->release, sizeof(name->release))) |
1156 | error = -EFAULT; | |
5cacdb4a CH |
1157 | if (!error && override_architecture(name)) |
1158 | error = -EFAULT; | |
1159 | return error; | |
1160 | } | |
1161 | ||
1162 | SYSCALL_DEFINE1(olduname, struct oldold_utsname __user *, name) | |
1163 | { | |
1164 | int error; | |
1165 | ||
1166 | if (!name) | |
1167 | return -EFAULT; | |
1168 | if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname))) | |
1169 | return -EFAULT; | |
1170 | ||
1171 | down_read(&uts_sem); | |
1172 | error = __copy_to_user(&name->sysname, &utsname()->sysname, | |
1173 | __OLD_UTS_LEN); | |
1174 | error |= __put_user(0, name->sysname + __OLD_UTS_LEN); | |
1175 | error |= __copy_to_user(&name->nodename, &utsname()->nodename, | |
1176 | __OLD_UTS_LEN); | |
1177 | error |= __put_user(0, name->nodename + __OLD_UTS_LEN); | |
1178 | error |= __copy_to_user(&name->release, &utsname()->release, | |
1179 | __OLD_UTS_LEN); | |
1180 | error |= __put_user(0, name->release + __OLD_UTS_LEN); | |
1181 | error |= __copy_to_user(&name->version, &utsname()->version, | |
1182 | __OLD_UTS_LEN); | |
1183 | error |= __put_user(0, name->version + __OLD_UTS_LEN); | |
1184 | error |= __copy_to_user(&name->machine, &utsname()->machine, | |
1185 | __OLD_UTS_LEN); | |
1186 | error |= __put_user(0, name->machine + __OLD_UTS_LEN); | |
1187 | up_read(&uts_sem); | |
1188 | ||
1189 | if (!error && override_architecture(name)) | |
1190 | error = -EFAULT; | |
be27425d AK |
1191 | if (!error && override_release(name->release, sizeof(name->release))) |
1192 | error = -EFAULT; | |
5cacdb4a CH |
1193 | return error ? -EFAULT : 0; |
1194 | } | |
1195 | #endif | |
1196 | ||
5a8a82b1 | 1197 | SYSCALL_DEFINE2(sethostname, char __user *, name, int, len) |
1da177e4 LT |
1198 | { |
1199 | int errno; | |
1200 | char tmp[__NEW_UTS_LEN]; | |
1201 | ||
bb96a6f5 | 1202 | if (!ns_capable(current->nsproxy->uts_ns->user_ns, CAP_SYS_ADMIN)) |
1da177e4 | 1203 | return -EPERM; |
fc832ad3 | 1204 | |
1da177e4 LT |
1205 | if (len < 0 || len > __NEW_UTS_LEN) |
1206 | return -EINVAL; | |
1207 | down_write(&uts_sem); | |
1208 | errno = -EFAULT; | |
1209 | if (!copy_from_user(tmp, name, len)) { | |
9679e4dd AM |
1210 | struct new_utsname *u = utsname(); |
1211 | ||
1212 | memcpy(u->nodename, tmp, len); | |
1213 | memset(u->nodename + len, 0, sizeof(u->nodename) - len); | |
1da177e4 | 1214 | errno = 0; |
499eea6b | 1215 | uts_proc_notify(UTS_PROC_HOSTNAME); |
1da177e4 LT |
1216 | } |
1217 | up_write(&uts_sem); | |
1218 | return errno; | |
1219 | } | |
1220 | ||
1221 | #ifdef __ARCH_WANT_SYS_GETHOSTNAME | |
1222 | ||
5a8a82b1 | 1223 | SYSCALL_DEFINE2(gethostname, char __user *, name, int, len) |
1da177e4 LT |
1224 | { |
1225 | int i, errno; | |
9679e4dd | 1226 | struct new_utsname *u; |
1da177e4 LT |
1227 | |
1228 | if (len < 0) | |
1229 | return -EINVAL; | |
1230 | down_read(&uts_sem); | |
9679e4dd AM |
1231 | u = utsname(); |
1232 | i = 1 + strlen(u->nodename); | |
1da177e4 LT |
1233 | if (i > len) |
1234 | i = len; | |
1235 | errno = 0; | |
9679e4dd | 1236 | if (copy_to_user(name, u->nodename, i)) |
1da177e4 LT |
1237 | errno = -EFAULT; |
1238 | up_read(&uts_sem); | |
1239 | return errno; | |
1240 | } | |
1241 | ||
1242 | #endif | |
1243 | ||
1244 | /* | |
1245 | * Only setdomainname; getdomainname can be implemented by calling | |
1246 | * uname() | |
1247 | */ | |
5a8a82b1 | 1248 | SYSCALL_DEFINE2(setdomainname, char __user *, name, int, len) |
1da177e4 LT |
1249 | { |
1250 | int errno; | |
1251 | char tmp[__NEW_UTS_LEN]; | |
1252 | ||
fc832ad3 | 1253 | if (!ns_capable(current->nsproxy->uts_ns->user_ns, CAP_SYS_ADMIN)) |
1da177e4 LT |
1254 | return -EPERM; |
1255 | if (len < 0 || len > __NEW_UTS_LEN) | |
1256 | return -EINVAL; | |
1257 | ||
1258 | down_write(&uts_sem); | |
1259 | errno = -EFAULT; | |
1260 | if (!copy_from_user(tmp, name, len)) { | |
9679e4dd AM |
1261 | struct new_utsname *u = utsname(); |
1262 | ||
1263 | memcpy(u->domainname, tmp, len); | |
1264 | memset(u->domainname + len, 0, sizeof(u->domainname) - len); | |
1da177e4 | 1265 | errno = 0; |
499eea6b | 1266 | uts_proc_notify(UTS_PROC_DOMAINNAME); |
1da177e4 LT |
1267 | } |
1268 | up_write(&uts_sem); | |
1269 | return errno; | |
1270 | } | |
1271 | ||
e48fbb69 | 1272 | SYSCALL_DEFINE2(getrlimit, unsigned int, resource, struct rlimit __user *, rlim) |
1da177e4 | 1273 | { |
b9518345 JS |
1274 | struct rlimit value; |
1275 | int ret; | |
1276 | ||
1277 | ret = do_prlimit(current, resource, NULL, &value); | |
1278 | if (!ret) | |
1279 | ret = copy_to_user(rlim, &value, sizeof(*rlim)) ? -EFAULT : 0; | |
1280 | ||
1281 | return ret; | |
1da177e4 LT |
1282 | } |
1283 | ||
1284 | #ifdef __ARCH_WANT_SYS_OLD_GETRLIMIT | |
1285 | ||
1286 | /* | |
1287 | * Back compatibility for getrlimit. Needed for some apps. | |
1288 | */ | |
1289 | ||
e48fbb69 HC |
1290 | SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource, |
1291 | struct rlimit __user *, rlim) | |
1da177e4 LT |
1292 | { |
1293 | struct rlimit x; | |
1294 | if (resource >= RLIM_NLIMITS) | |
1295 | return -EINVAL; | |
1296 | ||
1297 | task_lock(current->group_leader); | |
1298 | x = current->signal->rlim[resource]; | |
1299 | task_unlock(current->group_leader); | |
756184b7 | 1300 | if (x.rlim_cur > 0x7FFFFFFF) |
1da177e4 | 1301 | x.rlim_cur = 0x7FFFFFFF; |
756184b7 | 1302 | if (x.rlim_max > 0x7FFFFFFF) |
1da177e4 LT |
1303 | x.rlim_max = 0x7FFFFFFF; |
1304 | return copy_to_user(rlim, &x, sizeof(x))?-EFAULT:0; | |
1305 | } | |
1306 | ||
1307 | #endif | |
1308 | ||
c022a0ac JS |
1309 | static inline bool rlim64_is_infinity(__u64 rlim64) |
1310 | { | |
1311 | #if BITS_PER_LONG < 64 | |
1312 | return rlim64 >= ULONG_MAX; | |
1313 | #else | |
1314 | return rlim64 == RLIM64_INFINITY; | |
1315 | #endif | |
1316 | } | |
1317 | ||
1318 | static void rlim_to_rlim64(const struct rlimit *rlim, struct rlimit64 *rlim64) | |
1319 | { | |
1320 | if (rlim->rlim_cur == RLIM_INFINITY) | |
1321 | rlim64->rlim_cur = RLIM64_INFINITY; | |
1322 | else | |
1323 | rlim64->rlim_cur = rlim->rlim_cur; | |
1324 | if (rlim->rlim_max == RLIM_INFINITY) | |
1325 | rlim64->rlim_max = RLIM64_INFINITY; | |
1326 | else | |
1327 | rlim64->rlim_max = rlim->rlim_max; | |
1328 | } | |
1329 | ||
1330 | static void rlim64_to_rlim(const struct rlimit64 *rlim64, struct rlimit *rlim) | |
1331 | { | |
1332 | if (rlim64_is_infinity(rlim64->rlim_cur)) | |
1333 | rlim->rlim_cur = RLIM_INFINITY; | |
1334 | else | |
1335 | rlim->rlim_cur = (unsigned long)rlim64->rlim_cur; | |
1336 | if (rlim64_is_infinity(rlim64->rlim_max)) | |
1337 | rlim->rlim_max = RLIM_INFINITY; | |
1338 | else | |
1339 | rlim->rlim_max = (unsigned long)rlim64->rlim_max; | |
1340 | } | |
1341 | ||
1c1e618d | 1342 | /* make sure you are allowed to change @tsk limits before calling this */ |
5b41535a JS |
1343 | int do_prlimit(struct task_struct *tsk, unsigned int resource, |
1344 | struct rlimit *new_rlim, struct rlimit *old_rlim) | |
1da177e4 | 1345 | { |
5b41535a | 1346 | struct rlimit *rlim; |
86f162f4 | 1347 | int retval = 0; |
1da177e4 LT |
1348 | |
1349 | if (resource >= RLIM_NLIMITS) | |
1350 | return -EINVAL; | |
5b41535a JS |
1351 | if (new_rlim) { |
1352 | if (new_rlim->rlim_cur > new_rlim->rlim_max) | |
1353 | return -EINVAL; | |
1354 | if (resource == RLIMIT_NOFILE && | |
1355 | new_rlim->rlim_max > sysctl_nr_open) | |
1356 | return -EPERM; | |
1357 | } | |
1da177e4 | 1358 | |
1c1e618d JS |
1359 | /* protect tsk->signal and tsk->sighand from disappearing */ |
1360 | read_lock(&tasklist_lock); | |
1361 | if (!tsk->sighand) { | |
1362 | retval = -ESRCH; | |
1363 | goto out; | |
1364 | } | |
1365 | ||
5b41535a | 1366 | rlim = tsk->signal->rlim + resource; |
86f162f4 | 1367 | task_lock(tsk->group_leader); |
5b41535a | 1368 | if (new_rlim) { |
fc832ad3 SH |
1369 | /* Keep the capable check against init_user_ns until |
1370 | cgroups can contain all limits */ | |
5b41535a JS |
1371 | if (new_rlim->rlim_max > rlim->rlim_max && |
1372 | !capable(CAP_SYS_RESOURCE)) | |
1373 | retval = -EPERM; | |
1374 | if (!retval) | |
1375 | retval = security_task_setrlimit(tsk->group_leader, | |
1376 | resource, new_rlim); | |
1377 | if (resource == RLIMIT_CPU && new_rlim->rlim_cur == 0) { | |
1378 | /* | |
1379 | * The caller is asking for an immediate RLIMIT_CPU | |
1380 | * expiry. But we use the zero value to mean "it was | |
1381 | * never set". So let's cheat and make it one second | |
1382 | * instead | |
1383 | */ | |
1384 | new_rlim->rlim_cur = 1; | |
1385 | } | |
1386 | } | |
1387 | if (!retval) { | |
1388 | if (old_rlim) | |
1389 | *old_rlim = *rlim; | |
1390 | if (new_rlim) | |
1391 | *rlim = *new_rlim; | |
9926e4c7 | 1392 | } |
7855c35d | 1393 | task_unlock(tsk->group_leader); |
1da177e4 | 1394 | |
d3561f78 AM |
1395 | /* |
1396 | * RLIMIT_CPU handling. Note that the kernel fails to return an error | |
1397 | * code if it rejected the user's attempt to set RLIMIT_CPU. This is a | |
1398 | * very long-standing error, and fixing it now risks breakage of | |
1399 | * applications, so we live with it | |
1400 | */ | |
5b41535a JS |
1401 | if (!retval && new_rlim && resource == RLIMIT_CPU && |
1402 | new_rlim->rlim_cur != RLIM_INFINITY) | |
1403 | update_rlimit_cpu(tsk, new_rlim->rlim_cur); | |
ec9e16ba | 1404 | out: |
1c1e618d | 1405 | read_unlock(&tasklist_lock); |
2fb9d268 | 1406 | return retval; |
1da177e4 LT |
1407 | } |
1408 | ||
c022a0ac JS |
1409 | /* rcu lock must be held */ |
1410 | static int check_prlimit_permission(struct task_struct *task) | |
1411 | { | |
1412 | const struct cred *cred = current_cred(), *tcred; | |
1413 | ||
fc832ad3 SH |
1414 | if (current == task) |
1415 | return 0; | |
c022a0ac | 1416 | |
fc832ad3 | 1417 | tcred = __task_cred(task); |
5af66203 EB |
1418 | if (uid_eq(cred->uid, tcred->euid) && |
1419 | uid_eq(cred->uid, tcred->suid) && | |
1420 | uid_eq(cred->uid, tcred->uid) && | |
1421 | gid_eq(cred->gid, tcred->egid) && | |
1422 | gid_eq(cred->gid, tcred->sgid) && | |
1423 | gid_eq(cred->gid, tcred->gid)) | |
fc832ad3 | 1424 | return 0; |
c4a4d603 | 1425 | if (ns_capable(tcred->user_ns, CAP_SYS_RESOURCE)) |
fc832ad3 SH |
1426 | return 0; |
1427 | ||
1428 | return -EPERM; | |
c022a0ac JS |
1429 | } |
1430 | ||
1431 | SYSCALL_DEFINE4(prlimit64, pid_t, pid, unsigned int, resource, | |
1432 | const struct rlimit64 __user *, new_rlim, | |
1433 | struct rlimit64 __user *, old_rlim) | |
1434 | { | |
1435 | struct rlimit64 old64, new64; | |
1436 | struct rlimit old, new; | |
1437 | struct task_struct *tsk; | |
1438 | int ret; | |
1439 | ||
1440 | if (new_rlim) { | |
1441 | if (copy_from_user(&new64, new_rlim, sizeof(new64))) | |
1442 | return -EFAULT; | |
1443 | rlim64_to_rlim(&new64, &new); | |
1444 | } | |
1445 | ||
1446 | rcu_read_lock(); | |
1447 | tsk = pid ? find_task_by_vpid(pid) : current; | |
1448 | if (!tsk) { | |
1449 | rcu_read_unlock(); | |
1450 | return -ESRCH; | |
1451 | } | |
1452 | ret = check_prlimit_permission(tsk); | |
1453 | if (ret) { | |
1454 | rcu_read_unlock(); | |
1455 | return ret; | |
1456 | } | |
1457 | get_task_struct(tsk); | |
1458 | rcu_read_unlock(); | |
1459 | ||
1460 | ret = do_prlimit(tsk, resource, new_rlim ? &new : NULL, | |
1461 | old_rlim ? &old : NULL); | |
1462 | ||
1463 | if (!ret && old_rlim) { | |
1464 | rlim_to_rlim64(&old, &old64); | |
1465 | if (copy_to_user(old_rlim, &old64, sizeof(old64))) | |
1466 | ret = -EFAULT; | |
1467 | } | |
1468 | ||
1469 | put_task_struct(tsk); | |
1470 | return ret; | |
1471 | } | |
1472 | ||
7855c35d JS |
1473 | SYSCALL_DEFINE2(setrlimit, unsigned int, resource, struct rlimit __user *, rlim) |
1474 | { | |
1475 | struct rlimit new_rlim; | |
1476 | ||
1477 | if (copy_from_user(&new_rlim, rlim, sizeof(*rlim))) | |
1478 | return -EFAULT; | |
5b41535a | 1479 | return do_prlimit(current, resource, &new_rlim, NULL); |
7855c35d JS |
1480 | } |
1481 | ||
1da177e4 LT |
1482 | /* |
1483 | * It would make sense to put struct rusage in the task_struct, | |
1484 | * except that would make the task_struct be *really big*. After | |
1485 | * task_struct gets moved into malloc'ed memory, it would | |
1486 | * make sense to do this. It will make moving the rest of the information | |
1487 | * a lot simpler! (Which we're not doing right now because we're not | |
1488 | * measuring them yet). | |
1489 | * | |
1da177e4 LT |
1490 | * When sampling multiple threads for RUSAGE_SELF, under SMP we might have |
1491 | * races with threads incrementing their own counters. But since word | |
1492 | * reads are atomic, we either get new values or old values and we don't | |
1493 | * care which for the sums. We always take the siglock to protect reading | |
1494 | * the c* fields from p->signal from races with exit.c updating those | |
1495 | * fields when reaping, so a sample either gets all the additions of a | |
1496 | * given child after it's reaped, or none so this sample is before reaping. | |
2dd0ebcd | 1497 | * |
de047c1b RT |
1498 | * Locking: |
1499 | * We need to take the siglock for CHILDEREN, SELF and BOTH | |
1500 | * for the cases current multithreaded, non-current single threaded | |
1501 | * non-current multithreaded. Thread traversal is now safe with | |
1502 | * the siglock held. | |
1503 | * Strictly speaking, we donot need to take the siglock if we are current and | |
1504 | * single threaded, as no one else can take our signal_struct away, no one | |
1505 | * else can reap the children to update signal->c* counters, and no one else | |
1506 | * can race with the signal-> fields. If we do not take any lock, the | |
1507 | * signal-> fields could be read out of order while another thread was just | |
1508 | * exiting. So we should place a read memory barrier when we avoid the lock. | |
1509 | * On the writer side, write memory barrier is implied in __exit_signal | |
1510 | * as __exit_signal releases the siglock spinlock after updating the signal-> | |
1511 | * fields. But we don't do this yet to keep things simple. | |
2dd0ebcd | 1512 | * |
1da177e4 LT |
1513 | */ |
1514 | ||
f06febc9 | 1515 | static void accumulate_thread_rusage(struct task_struct *t, struct rusage *r) |
679c9cd4 | 1516 | { |
679c9cd4 SK |
1517 | r->ru_nvcsw += t->nvcsw; |
1518 | r->ru_nivcsw += t->nivcsw; | |
1519 | r->ru_minflt += t->min_flt; | |
1520 | r->ru_majflt += t->maj_flt; | |
1521 | r->ru_inblock += task_io_get_inblock(t); | |
1522 | r->ru_oublock += task_io_get_oublock(t); | |
1523 | } | |
1524 | ||
1da177e4 LT |
1525 | static void k_getrusage(struct task_struct *p, int who, struct rusage *r) |
1526 | { | |
1527 | struct task_struct *t; | |
1528 | unsigned long flags; | |
0cf55e1e | 1529 | cputime_t tgutime, tgstime, utime, stime; |
1f10206c | 1530 | unsigned long maxrss = 0; |
1da177e4 LT |
1531 | |
1532 | memset((char *) r, 0, sizeof *r); | |
64861634 | 1533 | utime = stime = 0; |
1da177e4 | 1534 | |
679c9cd4 | 1535 | if (who == RUSAGE_THREAD) { |
e80d0a1a | 1536 | task_cputime_adjusted(current, &utime, &stime); |
f06febc9 | 1537 | accumulate_thread_rusage(p, r); |
1f10206c | 1538 | maxrss = p->signal->maxrss; |
679c9cd4 SK |
1539 | goto out; |
1540 | } | |
1541 | ||
d6cf723a | 1542 | if (!lock_task_sighand(p, &flags)) |
de047c1b | 1543 | return; |
0f59cc4a | 1544 | |
1da177e4 | 1545 | switch (who) { |
0f59cc4a | 1546 | case RUSAGE_BOTH: |
1da177e4 | 1547 | case RUSAGE_CHILDREN: |
1da177e4 LT |
1548 | utime = p->signal->cutime; |
1549 | stime = p->signal->cstime; | |
1550 | r->ru_nvcsw = p->signal->cnvcsw; | |
1551 | r->ru_nivcsw = p->signal->cnivcsw; | |
1552 | r->ru_minflt = p->signal->cmin_flt; | |
1553 | r->ru_majflt = p->signal->cmaj_flt; | |
6eaeeaba ED |
1554 | r->ru_inblock = p->signal->cinblock; |
1555 | r->ru_oublock = p->signal->coublock; | |
1f10206c | 1556 | maxrss = p->signal->cmaxrss; |
0f59cc4a ON |
1557 | |
1558 | if (who == RUSAGE_CHILDREN) | |
1559 | break; | |
1560 | ||
1da177e4 | 1561 | case RUSAGE_SELF: |
e80d0a1a | 1562 | thread_group_cputime_adjusted(p, &tgutime, &tgstime); |
64861634 MS |
1563 | utime += tgutime; |
1564 | stime += tgstime; | |
1da177e4 LT |
1565 | r->ru_nvcsw += p->signal->nvcsw; |
1566 | r->ru_nivcsw += p->signal->nivcsw; | |
1567 | r->ru_minflt += p->signal->min_flt; | |
1568 | r->ru_majflt += p->signal->maj_flt; | |
6eaeeaba ED |
1569 | r->ru_inblock += p->signal->inblock; |
1570 | r->ru_oublock += p->signal->oublock; | |
1f10206c JP |
1571 | if (maxrss < p->signal->maxrss) |
1572 | maxrss = p->signal->maxrss; | |
1da177e4 LT |
1573 | t = p; |
1574 | do { | |
f06febc9 | 1575 | accumulate_thread_rusage(t, r); |
1da177e4 LT |
1576 | t = next_thread(t); |
1577 | } while (t != p); | |
1da177e4 | 1578 | break; |
0f59cc4a | 1579 | |
1da177e4 LT |
1580 | default: |
1581 | BUG(); | |
1582 | } | |
de047c1b | 1583 | unlock_task_sighand(p, &flags); |
de047c1b | 1584 | |
679c9cd4 | 1585 | out: |
0f59cc4a ON |
1586 | cputime_to_timeval(utime, &r->ru_utime); |
1587 | cputime_to_timeval(stime, &r->ru_stime); | |
1f10206c JP |
1588 | |
1589 | if (who != RUSAGE_CHILDREN) { | |
1590 | struct mm_struct *mm = get_task_mm(p); | |
1591 | if (mm) { | |
1592 | setmax_mm_hiwater_rss(&maxrss, mm); | |
1593 | mmput(mm); | |
1594 | } | |
1595 | } | |
1596 | r->ru_maxrss = maxrss * (PAGE_SIZE / 1024); /* convert pages to KBs */ | |
1da177e4 LT |
1597 | } |
1598 | ||
1599 | int getrusage(struct task_struct *p, int who, struct rusage __user *ru) | |
1600 | { | |
1601 | struct rusage r; | |
1da177e4 | 1602 | k_getrusage(p, who, &r); |
1da177e4 LT |
1603 | return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0; |
1604 | } | |
1605 | ||
e48fbb69 | 1606 | SYSCALL_DEFINE2(getrusage, int, who, struct rusage __user *, ru) |
1da177e4 | 1607 | { |
679c9cd4 SK |
1608 | if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN && |
1609 | who != RUSAGE_THREAD) | |
1da177e4 LT |
1610 | return -EINVAL; |
1611 | return getrusage(current, who, ru); | |
1612 | } | |
1613 | ||
8d2d5c4a AV |
1614 | #ifdef CONFIG_COMPAT |
1615 | COMPAT_SYSCALL_DEFINE2(getrusage, int, who, struct compat_rusage __user *, ru) | |
1616 | { | |
1617 | struct rusage r; | |
1618 | ||
1619 | if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN && | |
1620 | who != RUSAGE_THREAD) | |
1621 | return -EINVAL; | |
1622 | ||
1623 | k_getrusage(current, who, &r); | |
1624 | return put_compat_rusage(&r, ru); | |
1625 | } | |
1626 | #endif | |
1627 | ||
e48fbb69 | 1628 | SYSCALL_DEFINE1(umask, int, mask) |
1da177e4 LT |
1629 | { |
1630 | mask = xchg(¤t->fs->umask, mask & S_IRWXUGO); | |
1631 | return mask; | |
1632 | } | |
3b7391de | 1633 | |
b32dfe37 CG |
1634 | static int prctl_set_mm_exe_file(struct mm_struct *mm, unsigned int fd) |
1635 | { | |
2903ff01 | 1636 | struct fd exe; |
496ad9aa | 1637 | struct inode *inode; |
2903ff01 | 1638 | int err; |
b32dfe37 | 1639 | |
2903ff01 AV |
1640 | exe = fdget(fd); |
1641 | if (!exe.file) | |
b32dfe37 CG |
1642 | return -EBADF; |
1643 | ||
496ad9aa | 1644 | inode = file_inode(exe.file); |
b32dfe37 CG |
1645 | |
1646 | /* | |
1647 | * Because the original mm->exe_file points to executable file, make | |
1648 | * sure that this one is executable as well, to avoid breaking an | |
1649 | * overall picture. | |
1650 | */ | |
1651 | err = -EACCES; | |
496ad9aa | 1652 | if (!S_ISREG(inode->i_mode) || |
2903ff01 | 1653 | exe.file->f_path.mnt->mnt_flags & MNT_NOEXEC) |
b32dfe37 CG |
1654 | goto exit; |
1655 | ||
496ad9aa | 1656 | err = inode_permission(inode, MAY_EXEC); |
b32dfe37 CG |
1657 | if (err) |
1658 | goto exit; | |
1659 | ||
bafb282d KK |
1660 | down_write(&mm->mmap_sem); |
1661 | ||
1662 | /* | |
4229fb1d | 1663 | * Forbid mm->exe_file change if old file still mapped. |
bafb282d KK |
1664 | */ |
1665 | err = -EBUSY; | |
4229fb1d KK |
1666 | if (mm->exe_file) { |
1667 | struct vm_area_struct *vma; | |
1668 | ||
1669 | for (vma = mm->mmap; vma; vma = vma->vm_next) | |
1670 | if (vma->vm_file && | |
1671 | path_equal(&vma->vm_file->f_path, | |
1672 | &mm->exe_file->f_path)) | |
1673 | goto exit_unlock; | |
bafb282d KK |
1674 | } |
1675 | ||
b32dfe37 CG |
1676 | /* |
1677 | * The symlink can be changed only once, just to disallow arbitrary | |
1678 | * transitions malicious software might bring in. This means one | |
1679 | * could make a snapshot over all processes running and monitor | |
1680 | * /proc/pid/exe changes to notice unusual activity if needed. | |
1681 | */ | |
bafb282d KK |
1682 | err = -EPERM; |
1683 | if (test_and_set_bit(MMF_EXE_FILE_CHANGED, &mm->flags)) | |
1684 | goto exit_unlock; | |
1685 | ||
4229fb1d | 1686 | err = 0; |
2903ff01 | 1687 | set_mm_exe_file(mm, exe.file); /* this grabs a reference to exe.file */ |
bafb282d | 1688 | exit_unlock: |
b32dfe37 CG |
1689 | up_write(&mm->mmap_sem); |
1690 | ||
1691 | exit: | |
2903ff01 | 1692 | fdput(exe); |
b32dfe37 CG |
1693 | return err; |
1694 | } | |
1695 | ||
028ee4be CG |
1696 | static int prctl_set_mm(int opt, unsigned long addr, |
1697 | unsigned long arg4, unsigned long arg5) | |
1698 | { | |
1699 | unsigned long rlim = rlimit(RLIMIT_DATA); | |
028ee4be | 1700 | struct mm_struct *mm = current->mm; |
fe8c7f5c CG |
1701 | struct vm_area_struct *vma; |
1702 | int error; | |
028ee4be | 1703 | |
fe8c7f5c | 1704 | if (arg5 || (arg4 && opt != PR_SET_MM_AUXV)) |
028ee4be CG |
1705 | return -EINVAL; |
1706 | ||
79f0713d | 1707 | if (!capable(CAP_SYS_RESOURCE)) |
028ee4be CG |
1708 | return -EPERM; |
1709 | ||
b32dfe37 CG |
1710 | if (opt == PR_SET_MM_EXE_FILE) |
1711 | return prctl_set_mm_exe_file(mm, (unsigned int)addr); | |
1712 | ||
1ad75b9e | 1713 | if (addr >= TASK_SIZE || addr < mmap_min_addr) |
028ee4be CG |
1714 | return -EINVAL; |
1715 | ||
fe8c7f5c CG |
1716 | error = -EINVAL; |
1717 | ||
028ee4be CG |
1718 | down_read(&mm->mmap_sem); |
1719 | vma = find_vma(mm, addr); | |
1720 | ||
028ee4be CG |
1721 | switch (opt) { |
1722 | case PR_SET_MM_START_CODE: | |
fe8c7f5c CG |
1723 | mm->start_code = addr; |
1724 | break; | |
028ee4be | 1725 | case PR_SET_MM_END_CODE: |
fe8c7f5c | 1726 | mm->end_code = addr; |
028ee4be | 1727 | break; |
028ee4be | 1728 | case PR_SET_MM_START_DATA: |
fe8c7f5c | 1729 | mm->start_data = addr; |
028ee4be | 1730 | break; |
fe8c7f5c CG |
1731 | case PR_SET_MM_END_DATA: |
1732 | mm->end_data = addr; | |
028ee4be CG |
1733 | break; |
1734 | ||
1735 | case PR_SET_MM_START_BRK: | |
1736 | if (addr <= mm->end_data) | |
1737 | goto out; | |
1738 | ||
1739 | if (rlim < RLIM_INFINITY && | |
1740 | (mm->brk - addr) + | |
1741 | (mm->end_data - mm->start_data) > rlim) | |
1742 | goto out; | |
1743 | ||
1744 | mm->start_brk = addr; | |
1745 | break; | |
1746 | ||
1747 | case PR_SET_MM_BRK: | |
1748 | if (addr <= mm->end_data) | |
1749 | goto out; | |
1750 | ||
1751 | if (rlim < RLIM_INFINITY && | |
1752 | (addr - mm->start_brk) + | |
1753 | (mm->end_data - mm->start_data) > rlim) | |
1754 | goto out; | |
1755 | ||
1756 | mm->brk = addr; | |
1757 | break; | |
1758 | ||
fe8c7f5c CG |
1759 | /* |
1760 | * If command line arguments and environment | |
1761 | * are placed somewhere else on stack, we can | |
1762 | * set them up here, ARG_START/END to setup | |
1763 | * command line argumets and ENV_START/END | |
1764 | * for environment. | |
1765 | */ | |
1766 | case PR_SET_MM_START_STACK: | |
1767 | case PR_SET_MM_ARG_START: | |
1768 | case PR_SET_MM_ARG_END: | |
1769 | case PR_SET_MM_ENV_START: | |
1770 | case PR_SET_MM_ENV_END: | |
1771 | if (!vma) { | |
1772 | error = -EFAULT; | |
1773 | goto out; | |
1774 | } | |
fe8c7f5c CG |
1775 | if (opt == PR_SET_MM_START_STACK) |
1776 | mm->start_stack = addr; | |
1777 | else if (opt == PR_SET_MM_ARG_START) | |
1778 | mm->arg_start = addr; | |
1779 | else if (opt == PR_SET_MM_ARG_END) | |
1780 | mm->arg_end = addr; | |
1781 | else if (opt == PR_SET_MM_ENV_START) | |
1782 | mm->env_start = addr; | |
1783 | else if (opt == PR_SET_MM_ENV_END) | |
1784 | mm->env_end = addr; | |
1785 | break; | |
1786 | ||
1787 | /* | |
1788 | * This doesn't move auxiliary vector itself | |
1789 | * since it's pinned to mm_struct, but allow | |
1790 | * to fill vector with new values. It's up | |
1791 | * to a caller to provide sane values here | |
1792 | * otherwise user space tools which use this | |
1793 | * vector might be unhappy. | |
1794 | */ | |
1795 | case PR_SET_MM_AUXV: { | |
1796 | unsigned long user_auxv[AT_VECTOR_SIZE]; | |
1797 | ||
1798 | if (arg4 > sizeof(user_auxv)) | |
1799 | goto out; | |
1800 | up_read(&mm->mmap_sem); | |
1801 | ||
1802 | if (copy_from_user(user_auxv, (const void __user *)addr, arg4)) | |
1803 | return -EFAULT; | |
1804 | ||
1805 | /* Make sure the last entry is always AT_NULL */ | |
1806 | user_auxv[AT_VECTOR_SIZE - 2] = 0; | |
1807 | user_auxv[AT_VECTOR_SIZE - 1] = 0; | |
1808 | ||
1809 | BUILD_BUG_ON(sizeof(user_auxv) != sizeof(mm->saved_auxv)); | |
1810 | ||
1811 | task_lock(current); | |
1812 | memcpy(mm->saved_auxv, user_auxv, arg4); | |
1813 | task_unlock(current); | |
1814 | ||
1815 | return 0; | |
1816 | } | |
028ee4be | 1817 | default: |
028ee4be CG |
1818 | goto out; |
1819 | } | |
1820 | ||
1821 | error = 0; | |
028ee4be CG |
1822 | out: |
1823 | up_read(&mm->mmap_sem); | |
028ee4be CG |
1824 | return error; |
1825 | } | |
300f786b | 1826 | |
52b36941 | 1827 | #ifdef CONFIG_CHECKPOINT_RESTORE |
300f786b CG |
1828 | static int prctl_get_tid_address(struct task_struct *me, int __user **tid_addr) |
1829 | { | |
1830 | return put_user(me->clear_child_tid, tid_addr); | |
1831 | } | |
52b36941 | 1832 | #else |
300f786b CG |
1833 | static int prctl_get_tid_address(struct task_struct *me, int __user **tid_addr) |
1834 | { | |
1835 | return -EINVAL; | |
1836 | } | |
028ee4be CG |
1837 | #endif |
1838 | ||
c4ea37c2 HC |
1839 | SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3, |
1840 | unsigned long, arg4, unsigned long, arg5) | |
1da177e4 | 1841 | { |
b6dff3ec DH |
1842 | struct task_struct *me = current; |
1843 | unsigned char comm[sizeof(me->comm)]; | |
1844 | long error; | |
1da177e4 | 1845 | |
d84f4f99 DH |
1846 | error = security_task_prctl(option, arg2, arg3, arg4, arg5); |
1847 | if (error != -ENOSYS) | |
1da177e4 LT |
1848 | return error; |
1849 | ||
d84f4f99 | 1850 | error = 0; |
1da177e4 | 1851 | switch (option) { |
f3cbd435 AM |
1852 | case PR_SET_PDEATHSIG: |
1853 | if (!valid_signal(arg2)) { | |
1854 | error = -EINVAL; | |
1da177e4 | 1855 | break; |
f3cbd435 AM |
1856 | } |
1857 | me->pdeath_signal = arg2; | |
1858 | break; | |
1859 | case PR_GET_PDEATHSIG: | |
1860 | error = put_user(me->pdeath_signal, (int __user *)arg2); | |
1861 | break; | |
1862 | case PR_GET_DUMPABLE: | |
1863 | error = get_dumpable(me->mm); | |
1864 | break; | |
1865 | case PR_SET_DUMPABLE: | |
1866 | if (arg2 != SUID_DUMP_DISABLE && arg2 != SUID_DUMP_USER) { | |
1867 | error = -EINVAL; | |
1da177e4 | 1868 | break; |
f3cbd435 AM |
1869 | } |
1870 | set_dumpable(me->mm, arg2); | |
1871 | break; | |
1da177e4 | 1872 | |
f3cbd435 AM |
1873 | case PR_SET_UNALIGN: |
1874 | error = SET_UNALIGN_CTL(me, arg2); | |
1875 | break; | |
1876 | case PR_GET_UNALIGN: | |
1877 | error = GET_UNALIGN_CTL(me, arg2); | |
1878 | break; | |
1879 | case PR_SET_FPEMU: | |
1880 | error = SET_FPEMU_CTL(me, arg2); | |
1881 | break; | |
1882 | case PR_GET_FPEMU: | |
1883 | error = GET_FPEMU_CTL(me, arg2); | |
1884 | break; | |
1885 | case PR_SET_FPEXC: | |
1886 | error = SET_FPEXC_CTL(me, arg2); | |
1887 | break; | |
1888 | case PR_GET_FPEXC: | |
1889 | error = GET_FPEXC_CTL(me, arg2); | |
1890 | break; | |
1891 | case PR_GET_TIMING: | |
1892 | error = PR_TIMING_STATISTICAL; | |
1893 | break; | |
1894 | case PR_SET_TIMING: | |
1895 | if (arg2 != PR_TIMING_STATISTICAL) | |
1896 | error = -EINVAL; | |
1897 | break; | |
1898 | case PR_SET_NAME: | |
1899 | comm[sizeof(me->comm) - 1] = 0; | |
1900 | if (strncpy_from_user(comm, (char __user *)arg2, | |
1901 | sizeof(me->comm) - 1) < 0) | |
1902 | return -EFAULT; | |
1903 | set_task_comm(me, comm); | |
1904 | proc_comm_connector(me); | |
1905 | break; | |
1906 | case PR_GET_NAME: | |
1907 | get_task_comm(comm, me); | |
1908 | if (copy_to_user((char __user *)arg2, comm, sizeof(comm))) | |
1909 | return -EFAULT; | |
1910 | break; | |
1911 | case PR_GET_ENDIAN: | |
1912 | error = GET_ENDIAN(me, arg2); | |
1913 | break; | |
1914 | case PR_SET_ENDIAN: | |
1915 | error = SET_ENDIAN(me, arg2); | |
1916 | break; | |
1917 | case PR_GET_SECCOMP: | |
1918 | error = prctl_get_seccomp(); | |
1919 | break; | |
1920 | case PR_SET_SECCOMP: | |
1921 | error = prctl_set_seccomp(arg2, (char __user *)arg3); | |
1922 | break; | |
1923 | case PR_GET_TSC: | |
1924 | error = GET_TSC_CTL(arg2); | |
1925 | break; | |
1926 | case PR_SET_TSC: | |
1927 | error = SET_TSC_CTL(arg2); | |
1928 | break; | |
1929 | case PR_TASK_PERF_EVENTS_DISABLE: | |
1930 | error = perf_event_task_disable(); | |
1931 | break; | |
1932 | case PR_TASK_PERF_EVENTS_ENABLE: | |
1933 | error = perf_event_task_enable(); | |
1934 | break; | |
1935 | case PR_GET_TIMERSLACK: | |
1936 | error = current->timer_slack_ns; | |
1937 | break; | |
1938 | case PR_SET_TIMERSLACK: | |
1939 | if (arg2 <= 0) | |
1940 | current->timer_slack_ns = | |
6976675d | 1941 | current->default_timer_slack_ns; |
f3cbd435 AM |
1942 | else |
1943 | current->timer_slack_ns = arg2; | |
1944 | break; | |
1945 | case PR_MCE_KILL: | |
1946 | if (arg4 | arg5) | |
1947 | return -EINVAL; | |
1948 | switch (arg2) { | |
1949 | case PR_MCE_KILL_CLEAR: | |
1950 | if (arg3 != 0) | |
4db96cf0 | 1951 | return -EINVAL; |
f3cbd435 | 1952 | current->flags &= ~PF_MCE_PROCESS; |
4db96cf0 | 1953 | break; |
f3cbd435 AM |
1954 | case PR_MCE_KILL_SET: |
1955 | current->flags |= PF_MCE_PROCESS; | |
1956 | if (arg3 == PR_MCE_KILL_EARLY) | |
1957 | current->flags |= PF_MCE_EARLY; | |
1958 | else if (arg3 == PR_MCE_KILL_LATE) | |
1959 | current->flags &= ~PF_MCE_EARLY; | |
1960 | else if (arg3 == PR_MCE_KILL_DEFAULT) | |
1961 | current->flags &= | |
1962 | ~(PF_MCE_EARLY|PF_MCE_PROCESS); | |
1087e9b4 | 1963 | else |
259e5e6c | 1964 | return -EINVAL; |
259e5e6c | 1965 | break; |
1da177e4 | 1966 | default: |
f3cbd435 AM |
1967 | return -EINVAL; |
1968 | } | |
1969 | break; | |
1970 | case PR_MCE_KILL_GET: | |
1971 | if (arg2 | arg3 | arg4 | arg5) | |
1972 | return -EINVAL; | |
1973 | if (current->flags & PF_MCE_PROCESS) | |
1974 | error = (current->flags & PF_MCE_EARLY) ? | |
1975 | PR_MCE_KILL_EARLY : PR_MCE_KILL_LATE; | |
1976 | else | |
1977 | error = PR_MCE_KILL_DEFAULT; | |
1978 | break; | |
1979 | case PR_SET_MM: | |
1980 | error = prctl_set_mm(arg2, arg3, arg4, arg5); | |
1981 | break; | |
1982 | case PR_GET_TID_ADDRESS: | |
1983 | error = prctl_get_tid_address(me, (int __user **)arg2); | |
1984 | break; | |
1985 | case PR_SET_CHILD_SUBREAPER: | |
1986 | me->signal->is_child_subreaper = !!arg2; | |
1987 | break; | |
1988 | case PR_GET_CHILD_SUBREAPER: | |
1989 | error = put_user(me->signal->is_child_subreaper, | |
1990 | (int __user *)arg2); | |
1991 | break; | |
1992 | case PR_SET_NO_NEW_PRIVS: | |
1993 | if (arg2 != 1 || arg3 || arg4 || arg5) | |
1994 | return -EINVAL; | |
1995 | ||
1996 | current->no_new_privs = 1; | |
1997 | break; | |
1998 | case PR_GET_NO_NEW_PRIVS: | |
1999 | if (arg2 || arg3 || arg4 || arg5) | |
2000 | return -EINVAL; | |
2001 | return current->no_new_privs ? 1 : 0; | |
2002 | default: | |
2003 | error = -EINVAL; | |
2004 | break; | |
1da177e4 LT |
2005 | } |
2006 | return error; | |
2007 | } | |
3cfc348b | 2008 | |
836f92ad HC |
2009 | SYSCALL_DEFINE3(getcpu, unsigned __user *, cpup, unsigned __user *, nodep, |
2010 | struct getcpu_cache __user *, unused) | |
3cfc348b AK |
2011 | { |
2012 | int err = 0; | |
2013 | int cpu = raw_smp_processor_id(); | |
2014 | if (cpup) | |
2015 | err |= put_user(cpu, cpup); | |
2016 | if (nodep) | |
2017 | err |= put_user(cpu_to_node(cpu), nodep); | |
3cfc348b AK |
2018 | return err ? -EFAULT : 0; |
2019 | } | |
10a0a8d4 | 2020 | |
4a22f166 SR |
2021 | /** |
2022 | * do_sysinfo - fill in sysinfo struct | |
2023 | * @info: pointer to buffer to fill | |
2024 | */ | |
2025 | static int do_sysinfo(struct sysinfo *info) | |
2026 | { | |
2027 | unsigned long mem_total, sav_total; | |
2028 | unsigned int mem_unit, bitcount; | |
2029 | struct timespec tp; | |
2030 | ||
2031 | memset(info, 0, sizeof(struct sysinfo)); | |
2032 | ||
45c64940 | 2033 | get_monotonic_boottime(&tp); |
4a22f166 SR |
2034 | info->uptime = tp.tv_sec + (tp.tv_nsec ? 1 : 0); |
2035 | ||
2036 | get_avenrun(info->loads, 0, SI_LOAD_SHIFT - FSHIFT); | |
2037 | ||
2038 | info->procs = nr_threads; | |
2039 | ||
2040 | si_meminfo(info); | |
2041 | si_swapinfo(info); | |
2042 | ||
2043 | /* | |
2044 | * If the sum of all the available memory (i.e. ram + swap) | |
2045 | * is less than can be stored in a 32 bit unsigned long then | |
2046 | * we can be binary compatible with 2.2.x kernels. If not, | |
2047 | * well, in that case 2.2.x was broken anyways... | |
2048 | * | |
2049 | * -Erik Andersen <andersee@debian.org> | |
2050 | */ | |
2051 | ||
2052 | mem_total = info->totalram + info->totalswap; | |
2053 | if (mem_total < info->totalram || mem_total < info->totalswap) | |
2054 | goto out; | |
2055 | bitcount = 0; | |
2056 | mem_unit = info->mem_unit; | |
2057 | while (mem_unit > 1) { | |
2058 | bitcount++; | |
2059 | mem_unit >>= 1; | |
2060 | sav_total = mem_total; | |
2061 | mem_total <<= 1; | |
2062 | if (mem_total < sav_total) | |
2063 | goto out; | |
2064 | } | |
2065 | ||
2066 | /* | |
2067 | * If mem_total did not overflow, multiply all memory values by | |
2068 | * info->mem_unit and set it to 1. This leaves things compatible | |
2069 | * with 2.2.x, and also retains compatibility with earlier 2.4.x | |
2070 | * kernels... | |
2071 | */ | |
2072 | ||
2073 | info->mem_unit = 1; | |
2074 | info->totalram <<= bitcount; | |
2075 | info->freeram <<= bitcount; | |
2076 | info->sharedram <<= bitcount; | |
2077 | info->bufferram <<= bitcount; | |
2078 | info->totalswap <<= bitcount; | |
2079 | info->freeswap <<= bitcount; | |
2080 | info->totalhigh <<= bitcount; | |
2081 | info->freehigh <<= bitcount; | |
2082 | ||
2083 | out: | |
2084 | return 0; | |
2085 | } | |
2086 | ||
2087 | SYSCALL_DEFINE1(sysinfo, struct sysinfo __user *, info) | |
2088 | { | |
2089 | struct sysinfo val; | |
2090 | ||
2091 | do_sysinfo(&val); | |
2092 | ||
2093 | if (copy_to_user(info, &val, sizeof(struct sysinfo))) | |
2094 | return -EFAULT; | |
2095 | ||
2096 | return 0; | |
2097 | } | |
2098 | ||
2099 | #ifdef CONFIG_COMPAT | |
2100 | struct compat_sysinfo { | |
2101 | s32 uptime; | |
2102 | u32 loads[3]; | |
2103 | u32 totalram; | |
2104 | u32 freeram; | |
2105 | u32 sharedram; | |
2106 | u32 bufferram; | |
2107 | u32 totalswap; | |
2108 | u32 freeswap; | |
2109 | u16 procs; | |
2110 | u16 pad; | |
2111 | u32 totalhigh; | |
2112 | u32 freehigh; | |
2113 | u32 mem_unit; | |
2114 | char _f[20-2*sizeof(u32)-sizeof(int)]; | |
2115 | }; | |
2116 | ||
2117 | COMPAT_SYSCALL_DEFINE1(sysinfo, struct compat_sysinfo __user *, info) | |
2118 | { | |
2119 | struct sysinfo s; | |
2120 | ||
2121 | do_sysinfo(&s); | |
2122 | ||
2123 | /* Check to see if any memory value is too large for 32-bit and scale | |
2124 | * down if needed | |
2125 | */ | |
2126 | if ((s.totalram >> 32) || (s.totalswap >> 32)) { | |
2127 | int bitcount = 0; | |
2128 | ||
2129 | while (s.mem_unit < PAGE_SIZE) { | |
2130 | s.mem_unit <<= 1; | |
2131 | bitcount++; | |
2132 | } | |
2133 | ||
2134 | s.totalram >>= bitcount; | |
2135 | s.freeram >>= bitcount; | |
2136 | s.sharedram >>= bitcount; | |
2137 | s.bufferram >>= bitcount; | |
2138 | s.totalswap >>= bitcount; | |
2139 | s.freeswap >>= bitcount; | |
2140 | s.totalhigh >>= bitcount; | |
2141 | s.freehigh >>= bitcount; | |
2142 | } | |
2143 | ||
2144 | if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) || | |
2145 | __put_user(s.uptime, &info->uptime) || | |
2146 | __put_user(s.loads[0], &info->loads[0]) || | |
2147 | __put_user(s.loads[1], &info->loads[1]) || | |
2148 | __put_user(s.loads[2], &info->loads[2]) || | |
2149 | __put_user(s.totalram, &info->totalram) || | |
2150 | __put_user(s.freeram, &info->freeram) || | |
2151 | __put_user(s.sharedram, &info->sharedram) || | |
2152 | __put_user(s.bufferram, &info->bufferram) || | |
2153 | __put_user(s.totalswap, &info->totalswap) || | |
2154 | __put_user(s.freeswap, &info->freeswap) || | |
2155 | __put_user(s.procs, &info->procs) || | |
2156 | __put_user(s.totalhigh, &info->totalhigh) || | |
2157 | __put_user(s.freehigh, &info->freehigh) || | |
2158 | __put_user(s.mem_unit, &info->mem_unit)) | |
2159 | return -EFAULT; | |
2160 | ||
2161 | return 0; | |
2162 | } | |
2163 | #endif /* CONFIG_COMPAT */ |