1 // SPDX-License-Identifier: GPL-2.0
5 * Copyright (C) 1991, 1992 Linus Torvalds
8 #include <linux/export.h>
10 #include <linux/utsname.h>
11 #include <linux/mman.h>
12 #include <linux/reboot.h>
13 #include <linux/prctl.h>
14 #include <linux/highuid.h>
16 #include <linux/kmod.h>
17 #include <linux/perf_event.h>
18 #include <linux/resource.h>
19 #include <linux/kernel.h>
20 #include <linux/workqueue.h>
21 #include <linux/capability.h>
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>
30 #include <linux/signal.h>
31 #include <linux/cn_proc.h>
32 #include <linux/getcpu.h>
33 #include <linux/task_io_accounting_ops.h>
34 #include <linux/seccomp.h>
35 #include <linux/cpu.h>
36 #include <linux/personality.h>
37 #include <linux/ptrace.h>
38 #include <linux/fs_struct.h>
39 #include <linux/file.h>
40 #include <linux/mount.h>
41 #include <linux/gfp.h>
42 #include <linux/syscore_ops.h>
43 #include <linux/version.h>
44 #include <linux/ctype.h>
46 #include <linux/compat.h>
47 #include <linux/syscalls.h>
48 #include <linux/kprobes.h>
49 #include <linux/user_namespace.h>
50 #include <linux/binfmts.h>
52 #include <linux/sched.h>
53 #include <linux/sched/autogroup.h>
54 #include <linux/sched/loadavg.h>
55 #include <linux/sched/stat.h>
56 #include <linux/sched/mm.h>
57 #include <linux/sched/coredump.h>
58 #include <linux/sched/task.h>
59 #include <linux/sched/cputime.h>
60 #include <linux/rcupdate.h>
61 #include <linux/uidgid.h>
62 #include <linux/cred.h>
64 #include <linux/nospec.h>
66 #include <linux/kmsg_dump.h>
67 /* Move somewhere else to avoid recompiling? */
68 #include <generated/utsrelease.h>
70 #include <linux/uaccess.h>
72 #include <asm/unistd.h>
74 #ifndef SET_UNALIGN_CTL
75 # define SET_UNALIGN_CTL(a, b) (-EINVAL)
77 #ifndef GET_UNALIGN_CTL
78 # define GET_UNALIGN_CTL(a, b) (-EINVAL)
81 # define SET_FPEMU_CTL(a, b) (-EINVAL)
84 # define GET_FPEMU_CTL(a, b) (-EINVAL)
87 # define SET_FPEXC_CTL(a, b) (-EINVAL)
90 # define GET_FPEXC_CTL(a, b) (-EINVAL)
93 # define GET_ENDIAN(a, b) (-EINVAL)
96 # define SET_ENDIAN(a, b) (-EINVAL)
99 # define GET_TSC_CTL(a) (-EINVAL)
102 # define SET_TSC_CTL(a) (-EINVAL)
104 #ifndef MPX_ENABLE_MANAGEMENT
105 # define MPX_ENABLE_MANAGEMENT() (-EINVAL)
107 #ifndef MPX_DISABLE_MANAGEMENT
108 # define MPX_DISABLE_MANAGEMENT() (-EINVAL)
111 # define GET_FP_MODE(a) (-EINVAL)
114 # define SET_FP_MODE(a,b) (-EINVAL)
117 # define SVE_SET_VL(a) (-EINVAL)
120 # define SVE_GET_VL() (-EINVAL)
124 * this is where the system-wide overflow UID and GID are defined, for
125 * architectures that now have 32-bit UID/GID but didn't in the past
128 int overflowuid
= DEFAULT_OVERFLOWUID
;
129 int overflowgid
= DEFAULT_OVERFLOWGID
;
131 EXPORT_SYMBOL(overflowuid
);
132 EXPORT_SYMBOL(overflowgid
);
135 * the same as above, but for filesystems which can only store a 16-bit
136 * UID and GID. as such, this is needed on all architectures
139 int fs_overflowuid
= DEFAULT_FS_OVERFLOWUID
;
140 int fs_overflowgid
= DEFAULT_FS_OVERFLOWUID
;
142 EXPORT_SYMBOL(fs_overflowuid
);
143 EXPORT_SYMBOL(fs_overflowgid
);
146 * Returns true if current's euid is same as p's uid or euid,
147 * or has CAP_SYS_NICE to p's user_ns.
149 * Called with rcu_read_lock, creds are safe
151 static bool set_one_prio_perm(struct task_struct
*p
)
153 const struct cred
*cred
= current_cred(), *pcred
= __task_cred(p
);
155 if (uid_eq(pcred
->uid
, cred
->euid
) ||
156 uid_eq(pcred
->euid
, cred
->euid
))
158 if (ns_capable(pcred
->user_ns
, CAP_SYS_NICE
))
164 * set the priority of a task
165 * - the caller must hold the RCU read lock
167 static int set_one_prio(struct task_struct
*p
, int niceval
, int error
)
171 if (!set_one_prio_perm(p
)) {
175 if (niceval
< task_nice(p
) && !can_nice(p
, niceval
)) {
179 no_nice
= security_task_setnice(p
, niceval
);
186 set_user_nice(p
, niceval
);
191 SYSCALL_DEFINE3(setpriority
, int, which
, int, who
, int, niceval
)
193 struct task_struct
*g
, *p
;
194 struct user_struct
*user
;
195 const struct cred
*cred
= current_cred();
200 if (which
> PRIO_USER
|| which
< PRIO_PROCESS
)
203 /* normalize: avoid signed division (rounding problems) */
205 if (niceval
< MIN_NICE
)
207 if (niceval
> MAX_NICE
)
211 read_lock(&tasklist_lock
);
215 p
= find_task_by_vpid(who
);
219 error
= set_one_prio(p
, niceval
, error
);
223 pgrp
= find_vpid(who
);
225 pgrp
= task_pgrp(current
);
226 do_each_pid_thread(pgrp
, PIDTYPE_PGID
, p
) {
227 error
= set_one_prio(p
, niceval
, error
);
228 } while_each_pid_thread(pgrp
, PIDTYPE_PGID
, p
);
231 uid
= make_kuid(cred
->user_ns
, who
);
235 else if (!uid_eq(uid
, cred
->uid
)) {
236 user
= find_user(uid
);
238 goto out_unlock
; /* No processes for this user */
240 do_each_thread(g
, p
) {
241 if (uid_eq(task_uid(p
), uid
) && task_pid_vnr(p
))
242 error
= set_one_prio(p
, niceval
, error
);
243 } while_each_thread(g
, p
);
244 if (!uid_eq(uid
, cred
->uid
))
245 free_uid(user
); /* For find_user() */
249 read_unlock(&tasklist_lock
);
256 * Ugh. To avoid negative return values, "getpriority()" will
257 * not return the normal nice-value, but a negated value that
258 * has been offset by 20 (ie it returns 40..1 instead of -20..19)
259 * to stay compatible.
261 SYSCALL_DEFINE2(getpriority
, int, which
, int, who
)
263 struct task_struct
*g
, *p
;
264 struct user_struct
*user
;
265 const struct cred
*cred
= current_cred();
266 long niceval
, retval
= -ESRCH
;
270 if (which
> PRIO_USER
|| which
< PRIO_PROCESS
)
274 read_lock(&tasklist_lock
);
278 p
= find_task_by_vpid(who
);
282 niceval
= nice_to_rlimit(task_nice(p
));
283 if (niceval
> retval
)
289 pgrp
= find_vpid(who
);
291 pgrp
= task_pgrp(current
);
292 do_each_pid_thread(pgrp
, PIDTYPE_PGID
, p
) {
293 niceval
= nice_to_rlimit(task_nice(p
));
294 if (niceval
> retval
)
296 } while_each_pid_thread(pgrp
, PIDTYPE_PGID
, p
);
299 uid
= make_kuid(cred
->user_ns
, who
);
303 else if (!uid_eq(uid
, cred
->uid
)) {
304 user
= find_user(uid
);
306 goto out_unlock
; /* No processes for this user */
308 do_each_thread(g
, p
) {
309 if (uid_eq(task_uid(p
), uid
) && task_pid_vnr(p
)) {
310 niceval
= nice_to_rlimit(task_nice(p
));
311 if (niceval
> retval
)
314 } while_each_thread(g
, p
);
315 if (!uid_eq(uid
, cred
->uid
))
316 free_uid(user
); /* for find_user() */
320 read_unlock(&tasklist_lock
);
327 * Unprivileged users may change the real gid to the effective gid
328 * or vice versa. (BSD-style)
330 * If you set the real gid at all, or set the effective gid to a value not
331 * equal to the real gid, then the saved gid is set to the new effective gid.
333 * This makes it possible for a setgid program to completely drop its
334 * privileges, which is often a useful assertion to make when you are doing
335 * a security audit over a program.
337 * The general idea is that a program which uses just setregid() will be
338 * 100% compatible with BSD. A program which uses just setgid() will be
339 * 100% compatible with POSIX with saved IDs.
341 * SMP: There are not races, the GIDs are checked only by filesystem
342 * operations (as far as semantic preservation is concerned).
344 #ifdef CONFIG_MULTIUSER
345 SYSCALL_DEFINE2(setregid
, gid_t
, rgid
, gid_t
, egid
)
347 struct user_namespace
*ns
= current_user_ns();
348 const struct cred
*old
;
353 krgid
= make_kgid(ns
, rgid
);
354 kegid
= make_kgid(ns
, egid
);
356 if ((rgid
!= (gid_t
) -1) && !gid_valid(krgid
))
358 if ((egid
!= (gid_t
) -1) && !gid_valid(kegid
))
361 new = prepare_creds();
364 old
= current_cred();
367 if (rgid
!= (gid_t
) -1) {
368 if (gid_eq(old
->gid
, krgid
) ||
369 gid_eq(old
->egid
, krgid
) ||
370 ns_capable(old
->user_ns
, CAP_SETGID
))
375 if (egid
!= (gid_t
) -1) {
376 if (gid_eq(old
->gid
, kegid
) ||
377 gid_eq(old
->egid
, kegid
) ||
378 gid_eq(old
->sgid
, kegid
) ||
379 ns_capable(old
->user_ns
, CAP_SETGID
))
385 if (rgid
!= (gid_t
) -1 ||
386 (egid
!= (gid_t
) -1 && !gid_eq(kegid
, old
->gid
)))
387 new->sgid
= new->egid
;
388 new->fsgid
= new->egid
;
390 return commit_creds(new);
398 * setgid() is implemented like SysV w/ SAVED_IDS
400 * SMP: Same implicit races as above.
402 SYSCALL_DEFINE1(setgid
, gid_t
, gid
)
404 struct user_namespace
*ns
= current_user_ns();
405 const struct cred
*old
;
410 kgid
= make_kgid(ns
, gid
);
411 if (!gid_valid(kgid
))
414 new = prepare_creds();
417 old
= current_cred();
420 if (ns_capable(old
->user_ns
, CAP_SETGID
))
421 new->gid
= new->egid
= new->sgid
= new->fsgid
= kgid
;
422 else if (gid_eq(kgid
, old
->gid
) || gid_eq(kgid
, old
->sgid
))
423 new->egid
= new->fsgid
= kgid
;
427 return commit_creds(new);
435 * change the user struct in a credentials set to match the new UID
437 static int set_user(struct cred
*new)
439 struct user_struct
*new_user
;
441 new_user
= alloc_uid(new->uid
);
446 * We don't fail in case of NPROC limit excess here because too many
447 * poorly written programs don't check set*uid() return code, assuming
448 * it never fails if called by root. We may still enforce NPROC limit
449 * for programs doing set*uid()+execve() by harmlessly deferring the
450 * failure to the execve() stage.
452 if (atomic_read(&new_user
->processes
) >= rlimit(RLIMIT_NPROC
) &&
453 new_user
!= INIT_USER
)
454 current
->flags
|= PF_NPROC_EXCEEDED
;
456 current
->flags
&= ~PF_NPROC_EXCEEDED
;
459 new->user
= new_user
;
464 * Unprivileged users may change the real uid to the effective uid
465 * or vice versa. (BSD-style)
467 * If you set the real uid at all, or set the effective uid to a value not
468 * equal to the real uid, then the saved uid is set to the new effective uid.
470 * This makes it possible for a setuid program to completely drop its
471 * privileges, which is often a useful assertion to make when you are doing
472 * a security audit over a program.
474 * The general idea is that a program which uses just setreuid() will be
475 * 100% compatible with BSD. A program which uses just setuid() will be
476 * 100% compatible with POSIX with saved IDs.
478 SYSCALL_DEFINE2(setreuid
, uid_t
, ruid
, uid_t
, euid
)
480 struct user_namespace
*ns
= current_user_ns();
481 const struct cred
*old
;
486 kruid
= make_kuid(ns
, ruid
);
487 keuid
= make_kuid(ns
, euid
);
489 if ((ruid
!= (uid_t
) -1) && !uid_valid(kruid
))
491 if ((euid
!= (uid_t
) -1) && !uid_valid(keuid
))
494 new = prepare_creds();
497 old
= current_cred();
500 if (ruid
!= (uid_t
) -1) {
502 if (!uid_eq(old
->uid
, kruid
) &&
503 !uid_eq(old
->euid
, kruid
) &&
504 !ns_capable(old
->user_ns
, CAP_SETUID
))
508 if (euid
!= (uid_t
) -1) {
510 if (!uid_eq(old
->uid
, keuid
) &&
511 !uid_eq(old
->euid
, keuid
) &&
512 !uid_eq(old
->suid
, keuid
) &&
513 !ns_capable(old
->user_ns
, CAP_SETUID
))
517 if (!uid_eq(new->uid
, old
->uid
)) {
518 retval
= set_user(new);
522 if (ruid
!= (uid_t
) -1 ||
523 (euid
!= (uid_t
) -1 && !uid_eq(keuid
, old
->uid
)))
524 new->suid
= new->euid
;
525 new->fsuid
= new->euid
;
527 retval
= security_task_fix_setuid(new, old
, LSM_SETID_RE
);
531 return commit_creds(new);
539 * setuid() is implemented like SysV with SAVED_IDS
541 * Note that SAVED_ID's is deficient in that a setuid root program
542 * like sendmail, for example, cannot set its uid to be a normal
543 * user and then switch back, because if you're root, setuid() sets
544 * the saved uid too. If you don't like this, blame the bright people
545 * in the POSIX committee and/or USG. Note that the BSD-style setreuid()
546 * will allow a root program to temporarily drop privileges and be able to
547 * regain them by swapping the real and effective uid.
549 SYSCALL_DEFINE1(setuid
, uid_t
, uid
)
551 struct user_namespace
*ns
= current_user_ns();
552 const struct cred
*old
;
557 kuid
= make_kuid(ns
, uid
);
558 if (!uid_valid(kuid
))
561 new = prepare_creds();
564 old
= current_cred();
567 if (ns_capable(old
->user_ns
, CAP_SETUID
)) {
568 new->suid
= new->uid
= kuid
;
569 if (!uid_eq(kuid
, old
->uid
)) {
570 retval
= set_user(new);
574 } else if (!uid_eq(kuid
, old
->uid
) && !uid_eq(kuid
, new->suid
)) {
578 new->fsuid
= new->euid
= kuid
;
580 retval
= security_task_fix_setuid(new, old
, LSM_SETID_ID
);
584 return commit_creds(new);
593 * This function implements a generic ability to update ruid, euid,
594 * and suid. This allows you to implement the 4.4 compatible seteuid().
596 SYSCALL_DEFINE3(setresuid
, uid_t
, ruid
, uid_t
, euid
, uid_t
, suid
)
598 struct user_namespace
*ns
= current_user_ns();
599 const struct cred
*old
;
602 kuid_t kruid
, keuid
, ksuid
;
604 kruid
= make_kuid(ns
, ruid
);
605 keuid
= make_kuid(ns
, euid
);
606 ksuid
= make_kuid(ns
, suid
);
608 if ((ruid
!= (uid_t
) -1) && !uid_valid(kruid
))
611 if ((euid
!= (uid_t
) -1) && !uid_valid(keuid
))
614 if ((suid
!= (uid_t
) -1) && !uid_valid(ksuid
))
617 new = prepare_creds();
621 old
= current_cred();
624 if (!ns_capable(old
->user_ns
, CAP_SETUID
)) {
625 if (ruid
!= (uid_t
) -1 && !uid_eq(kruid
, old
->uid
) &&
626 !uid_eq(kruid
, old
->euid
) && !uid_eq(kruid
, old
->suid
))
628 if (euid
!= (uid_t
) -1 && !uid_eq(keuid
, old
->uid
) &&
629 !uid_eq(keuid
, old
->euid
) && !uid_eq(keuid
, old
->suid
))
631 if (suid
!= (uid_t
) -1 && !uid_eq(ksuid
, old
->uid
) &&
632 !uid_eq(ksuid
, old
->euid
) && !uid_eq(ksuid
, old
->suid
))
636 if (ruid
!= (uid_t
) -1) {
638 if (!uid_eq(kruid
, old
->uid
)) {
639 retval
= set_user(new);
644 if (euid
!= (uid_t
) -1)
646 if (suid
!= (uid_t
) -1)
648 new->fsuid
= new->euid
;
650 retval
= security_task_fix_setuid(new, old
, LSM_SETID_RES
);
654 return commit_creds(new);
661 SYSCALL_DEFINE3(getresuid
, uid_t __user
*, ruidp
, uid_t __user
*, euidp
, uid_t __user
*, suidp
)
663 const struct cred
*cred
= current_cred();
665 uid_t ruid
, euid
, suid
;
667 ruid
= from_kuid_munged(cred
->user_ns
, cred
->uid
);
668 euid
= from_kuid_munged(cred
->user_ns
, cred
->euid
);
669 suid
= from_kuid_munged(cred
->user_ns
, cred
->suid
);
671 retval
= put_user(ruid
, ruidp
);
673 retval
= put_user(euid
, euidp
);
675 return put_user(suid
, suidp
);
681 * Same as above, but for rgid, egid, sgid.
683 SYSCALL_DEFINE3(setresgid
, gid_t
, rgid
, gid_t
, egid
, gid_t
, sgid
)
685 struct user_namespace
*ns
= current_user_ns();
686 const struct cred
*old
;
689 kgid_t krgid
, kegid
, ksgid
;
691 krgid
= make_kgid(ns
, rgid
);
692 kegid
= make_kgid(ns
, egid
);
693 ksgid
= make_kgid(ns
, sgid
);
695 if ((rgid
!= (gid_t
) -1) && !gid_valid(krgid
))
697 if ((egid
!= (gid_t
) -1) && !gid_valid(kegid
))
699 if ((sgid
!= (gid_t
) -1) && !gid_valid(ksgid
))
702 new = prepare_creds();
705 old
= current_cred();
708 if (!ns_capable(old
->user_ns
, CAP_SETGID
)) {
709 if (rgid
!= (gid_t
) -1 && !gid_eq(krgid
, old
->gid
) &&
710 !gid_eq(krgid
, old
->egid
) && !gid_eq(krgid
, old
->sgid
))
712 if (egid
!= (gid_t
) -1 && !gid_eq(kegid
, old
->gid
) &&
713 !gid_eq(kegid
, old
->egid
) && !gid_eq(kegid
, old
->sgid
))
715 if (sgid
!= (gid_t
) -1 && !gid_eq(ksgid
, old
->gid
) &&
716 !gid_eq(ksgid
, old
->egid
) && !gid_eq(ksgid
, old
->sgid
))
720 if (rgid
!= (gid_t
) -1)
722 if (egid
!= (gid_t
) -1)
724 if (sgid
!= (gid_t
) -1)
726 new->fsgid
= new->egid
;
728 return commit_creds(new);
735 SYSCALL_DEFINE3(getresgid
, gid_t __user
*, rgidp
, gid_t __user
*, egidp
, gid_t __user
*, sgidp
)
737 const struct cred
*cred
= current_cred();
739 gid_t rgid
, egid
, sgid
;
741 rgid
= from_kgid_munged(cred
->user_ns
, cred
->gid
);
742 egid
= from_kgid_munged(cred
->user_ns
, cred
->egid
);
743 sgid
= from_kgid_munged(cred
->user_ns
, cred
->sgid
);
745 retval
= put_user(rgid
, rgidp
);
747 retval
= put_user(egid
, egidp
);
749 retval
= put_user(sgid
, sgidp
);
757 * "setfsuid()" sets the fsuid - the uid used for filesystem checks. This
758 * is used for "access()" and for the NFS daemon (letting nfsd stay at
759 * whatever uid it wants to). It normally shadows "euid", except when
760 * explicitly set by setfsuid() or for access..
762 SYSCALL_DEFINE1(setfsuid
, uid_t
, uid
)
764 const struct cred
*old
;
769 old
= current_cred();
770 old_fsuid
= from_kuid_munged(old
->user_ns
, old
->fsuid
);
772 kuid
= make_kuid(old
->user_ns
, uid
);
773 if (!uid_valid(kuid
))
776 new = prepare_creds();
780 if (uid_eq(kuid
, old
->uid
) || uid_eq(kuid
, old
->euid
) ||
781 uid_eq(kuid
, old
->suid
) || uid_eq(kuid
, old
->fsuid
) ||
782 ns_capable(old
->user_ns
, CAP_SETUID
)) {
783 if (!uid_eq(kuid
, old
->fsuid
)) {
785 if (security_task_fix_setuid(new, old
, LSM_SETID_FS
) == 0)
799 * Samma på svenska..
801 SYSCALL_DEFINE1(setfsgid
, gid_t
, gid
)
803 const struct cred
*old
;
808 old
= current_cred();
809 old_fsgid
= from_kgid_munged(old
->user_ns
, old
->fsgid
);
811 kgid
= make_kgid(old
->user_ns
, gid
);
812 if (!gid_valid(kgid
))
815 new = prepare_creds();
819 if (gid_eq(kgid
, old
->gid
) || gid_eq(kgid
, old
->egid
) ||
820 gid_eq(kgid
, old
->sgid
) || gid_eq(kgid
, old
->fsgid
) ||
821 ns_capable(old
->user_ns
, CAP_SETGID
)) {
822 if (!gid_eq(kgid
, old
->fsgid
)) {
835 #endif /* CONFIG_MULTIUSER */
838 * sys_getpid - return the thread group id of the current process
840 * Note, despite the name, this returns the tgid not the pid. The tgid and
841 * the pid are identical unless CLONE_THREAD was specified on clone() in
842 * which case the tgid is the same in all threads of the same group.
844 * This is SMP safe as current->tgid does not change.
846 SYSCALL_DEFINE0(getpid
)
848 return task_tgid_vnr(current
);
851 /* Thread ID - the internal kernel "pid" */
852 SYSCALL_DEFINE0(gettid
)
854 return task_pid_vnr(current
);
858 * Accessing ->real_parent is not SMP-safe, it could
859 * change from under us. However, we can use a stale
860 * value of ->real_parent under rcu_read_lock(), see
861 * release_task()->call_rcu(delayed_put_task_struct).
863 SYSCALL_DEFINE0(getppid
)
868 pid
= task_tgid_vnr(rcu_dereference(current
->real_parent
));
874 SYSCALL_DEFINE0(getuid
)
876 /* Only we change this so SMP safe */
877 return from_kuid_munged(current_user_ns(), current_uid());
880 SYSCALL_DEFINE0(geteuid
)
882 /* Only we change this so SMP safe */
883 return from_kuid_munged(current_user_ns(), current_euid());
886 SYSCALL_DEFINE0(getgid
)
888 /* Only we change this so SMP safe */
889 return from_kgid_munged(current_user_ns(), current_gid());
892 SYSCALL_DEFINE0(getegid
)
894 /* Only we change this so SMP safe */
895 return from_kgid_munged(current_user_ns(), current_egid());
898 static void do_sys_times(struct tms
*tms
)
900 u64 tgutime
, tgstime
, cutime
, cstime
;
902 thread_group_cputime_adjusted(current
, &tgutime
, &tgstime
);
903 cutime
= current
->signal
->cutime
;
904 cstime
= current
->signal
->cstime
;
905 tms
->tms_utime
= nsec_to_clock_t(tgutime
);
906 tms
->tms_stime
= nsec_to_clock_t(tgstime
);
907 tms
->tms_cutime
= nsec_to_clock_t(cutime
);
908 tms
->tms_cstime
= nsec_to_clock_t(cstime
);
911 SYSCALL_DEFINE1(times
, struct tms __user
*, tbuf
)
917 if (copy_to_user(tbuf
, &tmp
, sizeof(struct tms
)))
920 force_successful_syscall_return();
921 return (long) jiffies_64_to_clock_t(get_jiffies_64());
925 static compat_clock_t
clock_t_to_compat_clock_t(clock_t x
)
927 return compat_jiffies_to_clock_t(clock_t_to_jiffies(x
));
930 COMPAT_SYSCALL_DEFINE1(times
, struct compat_tms __user
*, tbuf
)
934 struct compat_tms tmp
;
937 /* Convert our struct tms to the compat version. */
938 tmp
.tms_utime
= clock_t_to_compat_clock_t(tms
.tms_utime
);
939 tmp
.tms_stime
= clock_t_to_compat_clock_t(tms
.tms_stime
);
940 tmp
.tms_cutime
= clock_t_to_compat_clock_t(tms
.tms_cutime
);
941 tmp
.tms_cstime
= clock_t_to_compat_clock_t(tms
.tms_cstime
);
942 if (copy_to_user(tbuf
, &tmp
, sizeof(tmp
)))
945 force_successful_syscall_return();
946 return compat_jiffies_to_clock_t(jiffies
);
951 * This needs some heavy checking ...
952 * I just haven't the stomach for it. I also don't fully
953 * understand sessions/pgrp etc. Let somebody who does explain it.
955 * OK, I think I have the protection semantics right.... this is really
956 * only important on a multi-user system anyway, to make sure one user
957 * can't send a signal to a process owned by another. -TYT, 12/12/91
959 * !PF_FORKNOEXEC check to conform completely to POSIX.
961 SYSCALL_DEFINE2(setpgid
, pid_t
, pid
, pid_t
, pgid
)
963 struct task_struct
*p
;
964 struct task_struct
*group_leader
= current
->group_leader
;
969 pid
= task_pid_vnr(group_leader
);
976 /* From this point forward we keep holding onto the tasklist lock
977 * so that our parent does not change from under us. -DaveM
979 write_lock_irq(&tasklist_lock
);
982 p
= find_task_by_vpid(pid
);
987 if (!thread_group_leader(p
))
990 if (same_thread_group(p
->real_parent
, group_leader
)) {
992 if (task_session(p
) != task_session(group_leader
))
995 if (!(p
->flags
& PF_FORKNOEXEC
))
999 if (p
!= group_leader
)
1004 if (p
->signal
->leader
)
1009 struct task_struct
*g
;
1011 pgrp
= find_vpid(pgid
);
1012 g
= pid_task(pgrp
, PIDTYPE_PGID
);
1013 if (!g
|| task_session(g
) != task_session(group_leader
))
1017 err
= security_task_setpgid(p
, pgid
);
1021 if (task_pgrp(p
) != pgrp
)
1022 change_pid(p
, PIDTYPE_PGID
, pgrp
);
1026 /* All paths lead to here, thus we are safe. -DaveM */
1027 write_unlock_irq(&tasklist_lock
);
1032 SYSCALL_DEFINE1(getpgid
, pid_t
, pid
)
1034 struct task_struct
*p
;
1040 grp
= task_pgrp(current
);
1043 p
= find_task_by_vpid(pid
);
1050 retval
= security_task_getpgid(p
);
1054 retval
= pid_vnr(grp
);
1060 #ifdef __ARCH_WANT_SYS_GETPGRP
1062 SYSCALL_DEFINE0(getpgrp
)
1064 return sys_getpgid(0);
1069 SYSCALL_DEFINE1(getsid
, pid_t
, pid
)
1071 struct task_struct
*p
;
1077 sid
= task_session(current
);
1080 p
= find_task_by_vpid(pid
);
1083 sid
= task_session(p
);
1087 retval
= security_task_getsid(p
);
1091 retval
= pid_vnr(sid
);
1097 static void set_special_pids(struct pid
*pid
)
1099 struct task_struct
*curr
= current
->group_leader
;
1101 if (task_session(curr
) != pid
)
1102 change_pid(curr
, PIDTYPE_SID
, pid
);
1104 if (task_pgrp(curr
) != pid
)
1105 change_pid(curr
, PIDTYPE_PGID
, pid
);
1108 SYSCALL_DEFINE0(setsid
)
1110 struct task_struct
*group_leader
= current
->group_leader
;
1111 struct pid
*sid
= task_pid(group_leader
);
1112 pid_t session
= pid_vnr(sid
);
1115 write_lock_irq(&tasklist_lock
);
1116 /* Fail if I am already a session leader */
1117 if (group_leader
->signal
->leader
)
1120 /* Fail if a process group id already exists that equals the
1121 * proposed session id.
1123 if (pid_task(sid
, PIDTYPE_PGID
))
1126 group_leader
->signal
->leader
= 1;
1127 set_special_pids(sid
);
1129 proc_clear_tty(group_leader
);
1133 write_unlock_irq(&tasklist_lock
);
1135 proc_sid_connector(group_leader
);
1136 sched_autogroup_create_attach(group_leader
);
1141 DECLARE_RWSEM(uts_sem
);
1143 #ifdef COMPAT_UTS_MACHINE
1144 static char compat_uts_machine
[__OLD_UTS_LEN
+1] = COMPAT_UTS_MACHINE
;
1146 static int __init
parse_compat_uts_machine(char *arg
)
1148 strncpy(compat_uts_machine
, arg
, __OLD_UTS_LEN
);
1149 compat_uts_machine
[__OLD_UTS_LEN
] = 0;
1152 early_param("compat_uts_machine", parse_compat_uts_machine
);
1154 #undef COMPAT_UTS_MACHINE
1155 #define COMPAT_UTS_MACHINE compat_uts_machine
1158 #ifdef COMPAT_UTS_MACHINE
1159 #define override_architecture(name) \
1160 (personality(current->personality) == PER_LINUX32 && \
1161 copy_to_user(name->machine, COMPAT_UTS_MACHINE, \
1162 sizeof(COMPAT_UTS_MACHINE)))
1164 #define override_architecture(name) 0
1168 * Work around broken programs that cannot handle "Linux 3.0".
1169 * Instead we map 3.x to 2.6.40+x, so e.g. 3.0 would be 2.6.40
1170 * And we map 4.x to 2.6.60+x, so 4.0 would be 2.6.60.
1172 static int override_release(char __user
*release
, size_t len
)
1176 if (current
->personality
& UNAME26
) {
1177 const char *rest
= UTS_RELEASE
;
1178 char buf
[65] = { 0 };
1184 if (*rest
== '.' && ++ndots
>= 3)
1186 if (!isdigit(*rest
) && *rest
!= '.')
1190 v
= ((LINUX_VERSION_CODE
>> 8) & 0xff) + 60;
1191 copy
= clamp_t(size_t, len
, 1, sizeof(buf
));
1192 copy
= scnprintf(buf
, copy
, "2.6.%u%s", v
, rest
);
1193 ret
= copy_to_user(release
, buf
, copy
+ 1);
1198 SYSCALL_DEFINE1(newuname
, struct new_utsname __user
*, name
)
1202 down_read(&uts_sem
);
1203 if (copy_to_user(name
, utsname(), sizeof *name
))
1207 if (!errno
&& override_release(name
->release
, sizeof(name
->release
)))
1209 if (!errno
&& override_architecture(name
))
1214 #ifdef __ARCH_WANT_SYS_OLD_UNAME
1218 SYSCALL_DEFINE1(uname
, struct old_utsname __user
*, name
)
1225 down_read(&uts_sem
);
1226 if (copy_to_user(name
, utsname(), sizeof(*name
)))
1230 if (!error
&& override_release(name
->release
, sizeof(name
->release
)))
1232 if (!error
&& override_architecture(name
))
1237 SYSCALL_DEFINE1(olduname
, struct oldold_utsname __user
*, name
)
1243 if (!access_ok(VERIFY_WRITE
, name
, sizeof(struct oldold_utsname
)))
1246 down_read(&uts_sem
);
1247 error
= __copy_to_user(&name
->sysname
, &utsname()->sysname
,
1249 error
|= __put_user(0, name
->sysname
+ __OLD_UTS_LEN
);
1250 error
|= __copy_to_user(&name
->nodename
, &utsname()->nodename
,
1252 error
|= __put_user(0, name
->nodename
+ __OLD_UTS_LEN
);
1253 error
|= __copy_to_user(&name
->release
, &utsname()->release
,
1255 error
|= __put_user(0, name
->release
+ __OLD_UTS_LEN
);
1256 error
|= __copy_to_user(&name
->version
, &utsname()->version
,
1258 error
|= __put_user(0, name
->version
+ __OLD_UTS_LEN
);
1259 error
|= __copy_to_user(&name
->machine
, &utsname()->machine
,
1261 error
|= __put_user(0, name
->machine
+ __OLD_UTS_LEN
);
1264 if (!error
&& override_architecture(name
))
1266 if (!error
&& override_release(name
->release
, sizeof(name
->release
)))
1268 return error
? -EFAULT
: 0;
1272 SYSCALL_DEFINE2(sethostname
, char __user
*, name
, int, len
)
1275 char tmp
[__NEW_UTS_LEN
];
1277 if (!ns_capable(current
->nsproxy
->uts_ns
->user_ns
, CAP_SYS_ADMIN
))
1280 if (len
< 0 || len
> __NEW_UTS_LEN
)
1282 down_write(&uts_sem
);
1284 if (!copy_from_user(tmp
, name
, len
)) {
1285 struct new_utsname
*u
= utsname();
1287 memcpy(u
->nodename
, tmp
, len
);
1288 memset(u
->nodename
+ len
, 0, sizeof(u
->nodename
) - len
);
1290 uts_proc_notify(UTS_PROC_HOSTNAME
);
1296 #ifdef __ARCH_WANT_SYS_GETHOSTNAME
1298 SYSCALL_DEFINE2(gethostname
, char __user
*, name
, int, len
)
1301 struct new_utsname
*u
;
1305 down_read(&uts_sem
);
1307 i
= 1 + strlen(u
->nodename
);
1311 if (copy_to_user(name
, u
->nodename
, i
))
1320 * Only setdomainname; getdomainname can be implemented by calling
1323 SYSCALL_DEFINE2(setdomainname
, char __user
*, name
, int, len
)
1326 char tmp
[__NEW_UTS_LEN
];
1328 if (!ns_capable(current
->nsproxy
->uts_ns
->user_ns
, CAP_SYS_ADMIN
))
1330 if (len
< 0 || len
> __NEW_UTS_LEN
)
1333 down_write(&uts_sem
);
1335 if (!copy_from_user(tmp
, name
, len
)) {
1336 struct new_utsname
*u
= utsname();
1338 memcpy(u
->domainname
, tmp
, len
);
1339 memset(u
->domainname
+ len
, 0, sizeof(u
->domainname
) - len
);
1341 uts_proc_notify(UTS_PROC_DOMAINNAME
);
1347 SYSCALL_DEFINE2(getrlimit
, unsigned int, resource
, struct rlimit __user
*, rlim
)
1349 struct rlimit value
;
1352 ret
= do_prlimit(current
, resource
, NULL
, &value
);
1354 ret
= copy_to_user(rlim
, &value
, sizeof(*rlim
)) ? -EFAULT
: 0;
1359 #ifdef CONFIG_COMPAT
1361 COMPAT_SYSCALL_DEFINE2(setrlimit
, unsigned int, resource
,
1362 struct compat_rlimit __user
*, rlim
)
1365 struct compat_rlimit r32
;
1367 if (copy_from_user(&r32
, rlim
, sizeof(struct compat_rlimit
)))
1370 if (r32
.rlim_cur
== COMPAT_RLIM_INFINITY
)
1371 r
.rlim_cur
= RLIM_INFINITY
;
1373 r
.rlim_cur
= r32
.rlim_cur
;
1374 if (r32
.rlim_max
== COMPAT_RLIM_INFINITY
)
1375 r
.rlim_max
= RLIM_INFINITY
;
1377 r
.rlim_max
= r32
.rlim_max
;
1378 return do_prlimit(current
, resource
, &r
, NULL
);
1381 COMPAT_SYSCALL_DEFINE2(getrlimit
, unsigned int, resource
,
1382 struct compat_rlimit __user
*, rlim
)
1387 ret
= do_prlimit(current
, resource
, NULL
, &r
);
1389 struct compat_rlimit r32
;
1390 if (r
.rlim_cur
> COMPAT_RLIM_INFINITY
)
1391 r32
.rlim_cur
= COMPAT_RLIM_INFINITY
;
1393 r32
.rlim_cur
= r
.rlim_cur
;
1394 if (r
.rlim_max
> COMPAT_RLIM_INFINITY
)
1395 r32
.rlim_max
= COMPAT_RLIM_INFINITY
;
1397 r32
.rlim_max
= r
.rlim_max
;
1399 if (copy_to_user(rlim
, &r32
, sizeof(struct compat_rlimit
)))
1407 #ifdef __ARCH_WANT_SYS_OLD_GETRLIMIT
1410 * Back compatibility for getrlimit. Needed for some apps.
1412 SYSCALL_DEFINE2(old_getrlimit
, unsigned int, resource
,
1413 struct rlimit __user
*, rlim
)
1416 if (resource
>= RLIM_NLIMITS
)
1419 resource
= array_index_nospec(resource
, RLIM_NLIMITS
);
1420 task_lock(current
->group_leader
);
1421 x
= current
->signal
->rlim
[resource
];
1422 task_unlock(current
->group_leader
);
1423 if (x
.rlim_cur
> 0x7FFFFFFF)
1424 x
.rlim_cur
= 0x7FFFFFFF;
1425 if (x
.rlim_max
> 0x7FFFFFFF)
1426 x
.rlim_max
= 0x7FFFFFFF;
1427 return copy_to_user(rlim
, &x
, sizeof(x
)) ? -EFAULT
: 0;
1430 #ifdef CONFIG_COMPAT
1431 COMPAT_SYSCALL_DEFINE2(old_getrlimit
, unsigned int, resource
,
1432 struct compat_rlimit __user
*, rlim
)
1436 if (resource
>= RLIM_NLIMITS
)
1439 resource
= array_index_nospec(resource
, RLIM_NLIMITS
);
1440 task_lock(current
->group_leader
);
1441 r
= current
->signal
->rlim
[resource
];
1442 task_unlock(current
->group_leader
);
1443 if (r
.rlim_cur
> 0x7FFFFFFF)
1444 r
.rlim_cur
= 0x7FFFFFFF;
1445 if (r
.rlim_max
> 0x7FFFFFFF)
1446 r
.rlim_max
= 0x7FFFFFFF;
1448 if (put_user(r
.rlim_cur
, &rlim
->rlim_cur
) ||
1449 put_user(r
.rlim_max
, &rlim
->rlim_max
))
1457 static inline bool rlim64_is_infinity(__u64 rlim64
)
1459 #if BITS_PER_LONG < 64
1460 return rlim64
>= ULONG_MAX
;
1462 return rlim64
== RLIM64_INFINITY
;
1466 static void rlim_to_rlim64(const struct rlimit
*rlim
, struct rlimit64
*rlim64
)
1468 if (rlim
->rlim_cur
== RLIM_INFINITY
)
1469 rlim64
->rlim_cur
= RLIM64_INFINITY
;
1471 rlim64
->rlim_cur
= rlim
->rlim_cur
;
1472 if (rlim
->rlim_max
== RLIM_INFINITY
)
1473 rlim64
->rlim_max
= RLIM64_INFINITY
;
1475 rlim64
->rlim_max
= rlim
->rlim_max
;
1478 static void rlim64_to_rlim(const struct rlimit64
*rlim64
, struct rlimit
*rlim
)
1480 if (rlim64_is_infinity(rlim64
->rlim_cur
))
1481 rlim
->rlim_cur
= RLIM_INFINITY
;
1483 rlim
->rlim_cur
= (unsigned long)rlim64
->rlim_cur
;
1484 if (rlim64_is_infinity(rlim64
->rlim_max
))
1485 rlim
->rlim_max
= RLIM_INFINITY
;
1487 rlim
->rlim_max
= (unsigned long)rlim64
->rlim_max
;
1490 /* make sure you are allowed to change @tsk limits before calling this */
1491 int do_prlimit(struct task_struct
*tsk
, unsigned int resource
,
1492 struct rlimit
*new_rlim
, struct rlimit
*old_rlim
)
1494 struct rlimit
*rlim
;
1497 if (resource
>= RLIM_NLIMITS
)
1500 if (new_rlim
->rlim_cur
> new_rlim
->rlim_max
)
1502 if (resource
== RLIMIT_NOFILE
&&
1503 new_rlim
->rlim_max
> sysctl_nr_open
)
1507 /* protect tsk->signal and tsk->sighand from disappearing */
1508 read_lock(&tasklist_lock
);
1509 if (!tsk
->sighand
) {
1514 rlim
= tsk
->signal
->rlim
+ resource
;
1515 task_lock(tsk
->group_leader
);
1517 /* Keep the capable check against init_user_ns until
1518 cgroups can contain all limits */
1519 if (new_rlim
->rlim_max
> rlim
->rlim_max
&&
1520 !capable(CAP_SYS_RESOURCE
))
1523 retval
= security_task_setrlimit(tsk
, resource
, new_rlim
);
1524 if (resource
== RLIMIT_CPU
&& new_rlim
->rlim_cur
== 0) {
1526 * The caller is asking for an immediate RLIMIT_CPU
1527 * expiry. But we use the zero value to mean "it was
1528 * never set". So let's cheat and make it one second
1531 new_rlim
->rlim_cur
= 1;
1540 task_unlock(tsk
->group_leader
);
1543 * RLIMIT_CPU handling. Note that the kernel fails to return an error
1544 * code if it rejected the user's attempt to set RLIMIT_CPU. This is a
1545 * very long-standing error, and fixing it now risks breakage of
1546 * applications, so we live with it
1548 if (!retval
&& new_rlim
&& resource
== RLIMIT_CPU
&&
1549 new_rlim
->rlim_cur
!= RLIM_INFINITY
&&
1550 IS_ENABLED(CONFIG_POSIX_TIMERS
))
1551 update_rlimit_cpu(tsk
, new_rlim
->rlim_cur
);
1553 read_unlock(&tasklist_lock
);
1557 /* rcu lock must be held */
1558 static int check_prlimit_permission(struct task_struct
*task
,
1561 const struct cred
*cred
= current_cred(), *tcred
;
1564 if (current
== task
)
1567 tcred
= __task_cred(task
);
1568 id_match
= (uid_eq(cred
->uid
, tcred
->euid
) &&
1569 uid_eq(cred
->uid
, tcred
->suid
) &&
1570 uid_eq(cred
->uid
, tcred
->uid
) &&
1571 gid_eq(cred
->gid
, tcred
->egid
) &&
1572 gid_eq(cred
->gid
, tcred
->sgid
) &&
1573 gid_eq(cred
->gid
, tcred
->gid
));
1574 if (!id_match
&& !ns_capable(tcred
->user_ns
, CAP_SYS_RESOURCE
))
1577 return security_task_prlimit(cred
, tcred
, flags
);
1580 SYSCALL_DEFINE4(prlimit64
, pid_t
, pid
, unsigned int, resource
,
1581 const struct rlimit64 __user
*, new_rlim
,
1582 struct rlimit64 __user
*, old_rlim
)
1584 struct rlimit64 old64
, new64
;
1585 struct rlimit old
, new;
1586 struct task_struct
*tsk
;
1587 unsigned int checkflags
= 0;
1591 checkflags
|= LSM_PRLIMIT_READ
;
1594 if (copy_from_user(&new64
, new_rlim
, sizeof(new64
)))
1596 rlim64_to_rlim(&new64
, &new);
1597 checkflags
|= LSM_PRLIMIT_WRITE
;
1601 tsk
= pid
? find_task_by_vpid(pid
) : current
;
1606 ret
= check_prlimit_permission(tsk
, checkflags
);
1611 get_task_struct(tsk
);
1614 ret
= do_prlimit(tsk
, resource
, new_rlim
? &new : NULL
,
1615 old_rlim
? &old
: NULL
);
1617 if (!ret
&& old_rlim
) {
1618 rlim_to_rlim64(&old
, &old64
);
1619 if (copy_to_user(old_rlim
, &old64
, sizeof(old64
)))
1623 put_task_struct(tsk
);
1627 SYSCALL_DEFINE2(setrlimit
, unsigned int, resource
, struct rlimit __user
*, rlim
)
1629 struct rlimit new_rlim
;
1631 if (copy_from_user(&new_rlim
, rlim
, sizeof(*rlim
)))
1633 return do_prlimit(current
, resource
, &new_rlim
, NULL
);
1637 * It would make sense to put struct rusage in the task_struct,
1638 * except that would make the task_struct be *really big*. After
1639 * task_struct gets moved into malloc'ed memory, it would
1640 * make sense to do this. It will make moving the rest of the information
1641 * a lot simpler! (Which we're not doing right now because we're not
1642 * measuring them yet).
1644 * When sampling multiple threads for RUSAGE_SELF, under SMP we might have
1645 * races with threads incrementing their own counters. But since word
1646 * reads are atomic, we either get new values or old values and we don't
1647 * care which for the sums. We always take the siglock to protect reading
1648 * the c* fields from p->signal from races with exit.c updating those
1649 * fields when reaping, so a sample either gets all the additions of a
1650 * given child after it's reaped, or none so this sample is before reaping.
1653 * We need to take the siglock for CHILDEREN, SELF and BOTH
1654 * for the cases current multithreaded, non-current single threaded
1655 * non-current multithreaded. Thread traversal is now safe with
1657 * Strictly speaking, we donot need to take the siglock if we are current and
1658 * single threaded, as no one else can take our signal_struct away, no one
1659 * else can reap the children to update signal->c* counters, and no one else
1660 * can race with the signal-> fields. If we do not take any lock, the
1661 * signal-> fields could be read out of order while another thread was just
1662 * exiting. So we should place a read memory barrier when we avoid the lock.
1663 * On the writer side, write memory barrier is implied in __exit_signal
1664 * as __exit_signal releases the siglock spinlock after updating the signal->
1665 * fields. But we don't do this yet to keep things simple.
1669 static void accumulate_thread_rusage(struct task_struct
*t
, struct rusage
*r
)
1671 r
->ru_nvcsw
+= t
->nvcsw
;
1672 r
->ru_nivcsw
+= t
->nivcsw
;
1673 r
->ru_minflt
+= t
->min_flt
;
1674 r
->ru_majflt
+= t
->maj_flt
;
1675 r
->ru_inblock
+= task_io_get_inblock(t
);
1676 r
->ru_oublock
+= task_io_get_oublock(t
);
1679 void getrusage(struct task_struct
*p
, int who
, struct rusage
*r
)
1681 struct task_struct
*t
;
1682 unsigned long flags
;
1683 u64 tgutime
, tgstime
, utime
, stime
;
1684 unsigned long maxrss
= 0;
1686 memset((char *)r
, 0, sizeof (*r
));
1689 if (who
== RUSAGE_THREAD
) {
1690 task_cputime_adjusted(current
, &utime
, &stime
);
1691 accumulate_thread_rusage(p
, r
);
1692 maxrss
= p
->signal
->maxrss
;
1696 if (!lock_task_sighand(p
, &flags
))
1701 case RUSAGE_CHILDREN
:
1702 utime
= p
->signal
->cutime
;
1703 stime
= p
->signal
->cstime
;
1704 r
->ru_nvcsw
= p
->signal
->cnvcsw
;
1705 r
->ru_nivcsw
= p
->signal
->cnivcsw
;
1706 r
->ru_minflt
= p
->signal
->cmin_flt
;
1707 r
->ru_majflt
= p
->signal
->cmaj_flt
;
1708 r
->ru_inblock
= p
->signal
->cinblock
;
1709 r
->ru_oublock
= p
->signal
->coublock
;
1710 maxrss
= p
->signal
->cmaxrss
;
1712 if (who
== RUSAGE_CHILDREN
)
1716 thread_group_cputime_adjusted(p
, &tgutime
, &tgstime
);
1719 r
->ru_nvcsw
+= p
->signal
->nvcsw
;
1720 r
->ru_nivcsw
+= p
->signal
->nivcsw
;
1721 r
->ru_minflt
+= p
->signal
->min_flt
;
1722 r
->ru_majflt
+= p
->signal
->maj_flt
;
1723 r
->ru_inblock
+= p
->signal
->inblock
;
1724 r
->ru_oublock
+= p
->signal
->oublock
;
1725 if (maxrss
< p
->signal
->maxrss
)
1726 maxrss
= p
->signal
->maxrss
;
1729 accumulate_thread_rusage(t
, r
);
1730 } while_each_thread(p
, t
);
1736 unlock_task_sighand(p
, &flags
);
1739 r
->ru_utime
= ns_to_timeval(utime
);
1740 r
->ru_stime
= ns_to_timeval(stime
);
1742 if (who
!= RUSAGE_CHILDREN
) {
1743 struct mm_struct
*mm
= get_task_mm(p
);
1746 setmax_mm_hiwater_rss(&maxrss
, mm
);
1750 r
->ru_maxrss
= maxrss
* (PAGE_SIZE
/ 1024); /* convert pages to KBs */
1753 SYSCALL_DEFINE2(getrusage
, int, who
, struct rusage __user
*, ru
)
1757 if (who
!= RUSAGE_SELF
&& who
!= RUSAGE_CHILDREN
&&
1758 who
!= RUSAGE_THREAD
)
1761 getrusage(current
, who
, &r
);
1762 return copy_to_user(ru
, &r
, sizeof(r
)) ? -EFAULT
: 0;
1765 #ifdef CONFIG_COMPAT
1766 COMPAT_SYSCALL_DEFINE2(getrusage
, int, who
, struct compat_rusage __user
*, ru
)
1770 if (who
!= RUSAGE_SELF
&& who
!= RUSAGE_CHILDREN
&&
1771 who
!= RUSAGE_THREAD
)
1774 getrusage(current
, who
, &r
);
1775 return put_compat_rusage(&r
, ru
);
1779 SYSCALL_DEFINE1(umask
, int, mask
)
1781 mask
= xchg(¤t
->fs
->umask
, mask
& S_IRWXUGO
);
1785 static int prctl_set_mm_exe_file(struct mm_struct
*mm
, unsigned int fd
)
1788 struct file
*old_exe
, *exe_file
;
1789 struct inode
*inode
;
1796 inode
= file_inode(exe
.file
);
1799 * Because the original mm->exe_file points to executable file, make
1800 * sure that this one is executable as well, to avoid breaking an
1804 if (!S_ISREG(inode
->i_mode
) || path_noexec(&exe
.file
->f_path
))
1807 err
= inode_permission(inode
, MAY_EXEC
);
1812 * Forbid mm->exe_file change if old file still mapped.
1814 exe_file
= get_mm_exe_file(mm
);
1817 struct vm_area_struct
*vma
;
1819 down_read(&mm
->mmap_sem
);
1820 for (vma
= mm
->mmap
; vma
; vma
= vma
->vm_next
) {
1823 if (path_equal(&vma
->vm_file
->f_path
,
1828 up_read(&mm
->mmap_sem
);
1833 /* set the new file, lockless */
1835 old_exe
= xchg(&mm
->exe_file
, exe
.file
);
1842 up_read(&mm
->mmap_sem
);
1848 * WARNING: we don't require any capability here so be very careful
1849 * in what is allowed for modification from userspace.
1851 static int validate_prctl_map(struct prctl_mm_map
*prctl_map
)
1853 unsigned long mmap_max_addr
= TASK_SIZE
;
1854 struct mm_struct
*mm
= current
->mm
;
1855 int error
= -EINVAL
, i
;
1857 static const unsigned char offsets
[] = {
1858 offsetof(struct prctl_mm_map
, start_code
),
1859 offsetof(struct prctl_mm_map
, end_code
),
1860 offsetof(struct prctl_mm_map
, start_data
),
1861 offsetof(struct prctl_mm_map
, end_data
),
1862 offsetof(struct prctl_mm_map
, start_brk
),
1863 offsetof(struct prctl_mm_map
, brk
),
1864 offsetof(struct prctl_mm_map
, start_stack
),
1865 offsetof(struct prctl_mm_map
, arg_start
),
1866 offsetof(struct prctl_mm_map
, arg_end
),
1867 offsetof(struct prctl_mm_map
, env_start
),
1868 offsetof(struct prctl_mm_map
, env_end
),
1872 * Make sure the members are not somewhere outside
1873 * of allowed address space.
1875 for (i
= 0; i
< ARRAY_SIZE(offsets
); i
++) {
1876 u64 val
= *(u64
*)((char *)prctl_map
+ offsets
[i
]);
1878 if ((unsigned long)val
>= mmap_max_addr
||
1879 (unsigned long)val
< mmap_min_addr
)
1884 * Make sure the pairs are ordered.
1886 #define __prctl_check_order(__m1, __op, __m2) \
1887 ((unsigned long)prctl_map->__m1 __op \
1888 (unsigned long)prctl_map->__m2) ? 0 : -EINVAL
1889 error
= __prctl_check_order(start_code
, <, end_code
);
1890 error
|= __prctl_check_order(start_data
, <, end_data
);
1891 error
|= __prctl_check_order(start_brk
, <=, brk
);
1892 error
|= __prctl_check_order(arg_start
, <=, arg_end
);
1893 error
|= __prctl_check_order(env_start
, <=, env_end
);
1896 #undef __prctl_check_order
1901 * @brk should be after @end_data in traditional maps.
1903 if (prctl_map
->start_brk
<= prctl_map
->end_data
||
1904 prctl_map
->brk
<= prctl_map
->end_data
)
1908 * Neither we should allow to override limits if they set.
1910 if (check_data_rlimit(rlimit(RLIMIT_DATA
), prctl_map
->brk
,
1911 prctl_map
->start_brk
, prctl_map
->end_data
,
1912 prctl_map
->start_data
))
1916 * Someone is trying to cheat the auxv vector.
1918 if (prctl_map
->auxv_size
) {
1919 if (!prctl_map
->auxv
|| prctl_map
->auxv_size
> sizeof(mm
->saved_auxv
))
1924 * Finally, make sure the caller has the rights to
1925 * change /proc/pid/exe link: only local sys admin should
1928 if (prctl_map
->exe_fd
!= (u32
)-1) {
1929 if (!ns_capable(current_user_ns(), CAP_SYS_ADMIN
))
1938 #ifdef CONFIG_CHECKPOINT_RESTORE
1939 static int prctl_set_mm_map(int opt
, const void __user
*addr
, unsigned long data_size
)
1941 struct prctl_mm_map prctl_map
= { .exe_fd
= (u32
)-1, };
1942 unsigned long user_auxv
[AT_VECTOR_SIZE
];
1943 struct mm_struct
*mm
= current
->mm
;
1946 BUILD_BUG_ON(sizeof(user_auxv
) != sizeof(mm
->saved_auxv
));
1947 BUILD_BUG_ON(sizeof(struct prctl_mm_map
) > 256);
1949 if (opt
== PR_SET_MM_MAP_SIZE
)
1950 return put_user((unsigned int)sizeof(prctl_map
),
1951 (unsigned int __user
*)addr
);
1953 if (data_size
!= sizeof(prctl_map
))
1956 if (copy_from_user(&prctl_map
, addr
, sizeof(prctl_map
)))
1959 error
= validate_prctl_map(&prctl_map
);
1963 if (prctl_map
.auxv_size
) {
1964 memset(user_auxv
, 0, sizeof(user_auxv
));
1965 if (copy_from_user(user_auxv
,
1966 (const void __user
*)prctl_map
.auxv
,
1967 prctl_map
.auxv_size
))
1970 /* Last entry must be AT_NULL as specification requires */
1971 user_auxv
[AT_VECTOR_SIZE
- 2] = AT_NULL
;
1972 user_auxv
[AT_VECTOR_SIZE
- 1] = AT_NULL
;
1975 if (prctl_map
.exe_fd
!= (u32
)-1) {
1976 error
= prctl_set_mm_exe_file(mm
, prctl_map
.exe_fd
);
1981 down_write(&mm
->mmap_sem
);
1984 * We don't validate if these members are pointing to
1985 * real present VMAs because application may have correspond
1986 * VMAs already unmapped and kernel uses these members for statistics
1987 * output in procfs mostly, except
1989 * - @start_brk/@brk which are used in do_brk but kernel lookups
1990 * for VMAs when updating these memvers so anything wrong written
1991 * here cause kernel to swear at userspace program but won't lead
1992 * to any problem in kernel itself
1995 mm
->start_code
= prctl_map
.start_code
;
1996 mm
->end_code
= prctl_map
.end_code
;
1997 mm
->start_data
= prctl_map
.start_data
;
1998 mm
->end_data
= prctl_map
.end_data
;
1999 mm
->start_brk
= prctl_map
.start_brk
;
2000 mm
->brk
= prctl_map
.brk
;
2001 mm
->start_stack
= prctl_map
.start_stack
;
2002 mm
->arg_start
= prctl_map
.arg_start
;
2003 mm
->arg_end
= prctl_map
.arg_end
;
2004 mm
->env_start
= prctl_map
.env_start
;
2005 mm
->env_end
= prctl_map
.env_end
;
2008 * Note this update of @saved_auxv is lockless thus
2009 * if someone reads this member in procfs while we're
2010 * updating -- it may get partly updated results. It's
2011 * known and acceptable trade off: we leave it as is to
2012 * not introduce additional locks here making the kernel
2015 if (prctl_map
.auxv_size
)
2016 memcpy(mm
->saved_auxv
, user_auxv
, sizeof(user_auxv
));
2018 up_write(&mm
->mmap_sem
);
2021 #endif /* CONFIG_CHECKPOINT_RESTORE */
2023 static int prctl_set_auxv(struct mm_struct
*mm
, unsigned long addr
,
2027 * This doesn't move the auxiliary vector itself since it's pinned to
2028 * mm_struct, but it permits filling the vector with new values. It's
2029 * up to the caller to provide sane values here, otherwise userspace
2030 * tools which use this vector might be unhappy.
2032 unsigned long user_auxv
[AT_VECTOR_SIZE
];
2034 if (len
> sizeof(user_auxv
))
2037 if (copy_from_user(user_auxv
, (const void __user
*)addr
, len
))
2040 /* Make sure the last entry is always AT_NULL */
2041 user_auxv
[AT_VECTOR_SIZE
- 2] = 0;
2042 user_auxv
[AT_VECTOR_SIZE
- 1] = 0;
2044 BUILD_BUG_ON(sizeof(user_auxv
) != sizeof(mm
->saved_auxv
));
2047 memcpy(mm
->saved_auxv
, user_auxv
, len
);
2048 task_unlock(current
);
2053 static int prctl_set_mm(int opt
, unsigned long addr
,
2054 unsigned long arg4
, unsigned long arg5
)
2056 struct mm_struct
*mm
= current
->mm
;
2057 struct prctl_mm_map prctl_map
;
2058 struct vm_area_struct
*vma
;
2061 if (arg5
|| (arg4
&& (opt
!= PR_SET_MM_AUXV
&&
2062 opt
!= PR_SET_MM_MAP
&&
2063 opt
!= PR_SET_MM_MAP_SIZE
)))
2066 #ifdef CONFIG_CHECKPOINT_RESTORE
2067 if (opt
== PR_SET_MM_MAP
|| opt
== PR_SET_MM_MAP_SIZE
)
2068 return prctl_set_mm_map(opt
, (const void __user
*)addr
, arg4
);
2071 if (!capable(CAP_SYS_RESOURCE
))
2074 if (opt
== PR_SET_MM_EXE_FILE
)
2075 return prctl_set_mm_exe_file(mm
, (unsigned int)addr
);
2077 if (opt
== PR_SET_MM_AUXV
)
2078 return prctl_set_auxv(mm
, addr
, arg4
);
2080 if (addr
>= TASK_SIZE
|| addr
< mmap_min_addr
)
2085 down_write(&mm
->mmap_sem
);
2086 vma
= find_vma(mm
, addr
);
2088 prctl_map
.start_code
= mm
->start_code
;
2089 prctl_map
.end_code
= mm
->end_code
;
2090 prctl_map
.start_data
= mm
->start_data
;
2091 prctl_map
.end_data
= mm
->end_data
;
2092 prctl_map
.start_brk
= mm
->start_brk
;
2093 prctl_map
.brk
= mm
->brk
;
2094 prctl_map
.start_stack
= mm
->start_stack
;
2095 prctl_map
.arg_start
= mm
->arg_start
;
2096 prctl_map
.arg_end
= mm
->arg_end
;
2097 prctl_map
.env_start
= mm
->env_start
;
2098 prctl_map
.env_end
= mm
->env_end
;
2099 prctl_map
.auxv
= NULL
;
2100 prctl_map
.auxv_size
= 0;
2101 prctl_map
.exe_fd
= -1;
2104 case PR_SET_MM_START_CODE
:
2105 prctl_map
.start_code
= addr
;
2107 case PR_SET_MM_END_CODE
:
2108 prctl_map
.end_code
= addr
;
2110 case PR_SET_MM_START_DATA
:
2111 prctl_map
.start_data
= addr
;
2113 case PR_SET_MM_END_DATA
:
2114 prctl_map
.end_data
= addr
;
2116 case PR_SET_MM_START_STACK
:
2117 prctl_map
.start_stack
= addr
;
2119 case PR_SET_MM_START_BRK
:
2120 prctl_map
.start_brk
= addr
;
2123 prctl_map
.brk
= addr
;
2125 case PR_SET_MM_ARG_START
:
2126 prctl_map
.arg_start
= addr
;
2128 case PR_SET_MM_ARG_END
:
2129 prctl_map
.arg_end
= addr
;
2131 case PR_SET_MM_ENV_START
:
2132 prctl_map
.env_start
= addr
;
2134 case PR_SET_MM_ENV_END
:
2135 prctl_map
.env_end
= addr
;
2141 error
= validate_prctl_map(&prctl_map
);
2147 * If command line arguments and environment
2148 * are placed somewhere else on stack, we can
2149 * set them up here, ARG_START/END to setup
2150 * command line argumets and ENV_START/END
2153 case PR_SET_MM_START_STACK
:
2154 case PR_SET_MM_ARG_START
:
2155 case PR_SET_MM_ARG_END
:
2156 case PR_SET_MM_ENV_START
:
2157 case PR_SET_MM_ENV_END
:
2164 mm
->start_code
= prctl_map
.start_code
;
2165 mm
->end_code
= prctl_map
.end_code
;
2166 mm
->start_data
= prctl_map
.start_data
;
2167 mm
->end_data
= prctl_map
.end_data
;
2168 mm
->start_brk
= prctl_map
.start_brk
;
2169 mm
->brk
= prctl_map
.brk
;
2170 mm
->start_stack
= prctl_map
.start_stack
;
2171 mm
->arg_start
= prctl_map
.arg_start
;
2172 mm
->arg_end
= prctl_map
.arg_end
;
2173 mm
->env_start
= prctl_map
.env_start
;
2174 mm
->env_end
= prctl_map
.env_end
;
2178 up_write(&mm
->mmap_sem
);
2182 #ifdef CONFIG_CHECKPOINT_RESTORE
2183 static int prctl_get_tid_address(struct task_struct
*me
, int __user
**tid_addr
)
2185 return put_user(me
->clear_child_tid
, tid_addr
);
2188 static int prctl_get_tid_address(struct task_struct
*me
, int __user
**tid_addr
)
2194 static int propagate_has_child_subreaper(struct task_struct
*p
, void *data
)
2197 * If task has has_child_subreaper - all its decendants
2198 * already have these flag too and new decendants will
2199 * inherit it on fork, skip them.
2201 * If we've found child_reaper - skip descendants in
2202 * it's subtree as they will never get out pidns.
2204 if (p
->signal
->has_child_subreaper
||
2205 is_child_reaper(task_pid(p
)))
2208 p
->signal
->has_child_subreaper
= 1;
2212 int __weak
arch_prctl_spec_ctrl_get(struct task_struct
*t
, unsigned long which
)
2217 int __weak
arch_prctl_spec_ctrl_set(struct task_struct
*t
, unsigned long which
,
2223 SYSCALL_DEFINE5(prctl
, int, option
, unsigned long, arg2
, unsigned long, arg3
,
2224 unsigned long, arg4
, unsigned long, arg5
)
2226 struct task_struct
*me
= current
;
2227 unsigned char comm
[sizeof(me
->comm
)];
2230 error
= security_task_prctl(option
, arg2
, arg3
, arg4
, arg5
);
2231 if (error
!= -ENOSYS
)
2236 case PR_SET_PDEATHSIG
:
2237 if (!valid_signal(arg2
)) {
2241 me
->pdeath_signal
= arg2
;
2243 case PR_GET_PDEATHSIG
:
2244 error
= put_user(me
->pdeath_signal
, (int __user
*)arg2
);
2246 case PR_GET_DUMPABLE
:
2247 error
= get_dumpable(me
->mm
);
2249 case PR_SET_DUMPABLE
:
2250 if (arg2
!= SUID_DUMP_DISABLE
&& arg2
!= SUID_DUMP_USER
) {
2254 set_dumpable(me
->mm
, arg2
);
2257 case PR_SET_UNALIGN
:
2258 error
= SET_UNALIGN_CTL(me
, arg2
);
2260 case PR_GET_UNALIGN
:
2261 error
= GET_UNALIGN_CTL(me
, arg2
);
2264 error
= SET_FPEMU_CTL(me
, arg2
);
2267 error
= GET_FPEMU_CTL(me
, arg2
);
2270 error
= SET_FPEXC_CTL(me
, arg2
);
2273 error
= GET_FPEXC_CTL(me
, arg2
);
2276 error
= PR_TIMING_STATISTICAL
;
2279 if (arg2
!= PR_TIMING_STATISTICAL
)
2283 comm
[sizeof(me
->comm
) - 1] = 0;
2284 if (strncpy_from_user(comm
, (char __user
*)arg2
,
2285 sizeof(me
->comm
) - 1) < 0)
2287 set_task_comm(me
, comm
);
2288 proc_comm_connector(me
);
2291 get_task_comm(comm
, me
);
2292 if (copy_to_user((char __user
*)arg2
, comm
, sizeof(comm
)))
2296 error
= GET_ENDIAN(me
, arg2
);
2299 error
= SET_ENDIAN(me
, arg2
);
2301 case PR_GET_SECCOMP
:
2302 error
= prctl_get_seccomp();
2304 case PR_SET_SECCOMP
:
2305 error
= prctl_set_seccomp(arg2
, (char __user
*)arg3
);
2308 error
= GET_TSC_CTL(arg2
);
2311 error
= SET_TSC_CTL(arg2
);
2313 case PR_TASK_PERF_EVENTS_DISABLE
:
2314 error
= perf_event_task_disable();
2316 case PR_TASK_PERF_EVENTS_ENABLE
:
2317 error
= perf_event_task_enable();
2319 case PR_GET_TIMERSLACK
:
2320 if (current
->timer_slack_ns
> ULONG_MAX
)
2323 error
= current
->timer_slack_ns
;
2325 case PR_SET_TIMERSLACK
:
2327 current
->timer_slack_ns
=
2328 current
->default_timer_slack_ns
;
2330 current
->timer_slack_ns
= arg2
;
2336 case PR_MCE_KILL_CLEAR
:
2339 current
->flags
&= ~PF_MCE_PROCESS
;
2341 case PR_MCE_KILL_SET
:
2342 current
->flags
|= PF_MCE_PROCESS
;
2343 if (arg3
== PR_MCE_KILL_EARLY
)
2344 current
->flags
|= PF_MCE_EARLY
;
2345 else if (arg3
== PR_MCE_KILL_LATE
)
2346 current
->flags
&= ~PF_MCE_EARLY
;
2347 else if (arg3
== PR_MCE_KILL_DEFAULT
)
2349 ~(PF_MCE_EARLY
|PF_MCE_PROCESS
);
2357 case PR_MCE_KILL_GET
:
2358 if (arg2
| arg3
| arg4
| arg5
)
2360 if (current
->flags
& PF_MCE_PROCESS
)
2361 error
= (current
->flags
& PF_MCE_EARLY
) ?
2362 PR_MCE_KILL_EARLY
: PR_MCE_KILL_LATE
;
2364 error
= PR_MCE_KILL_DEFAULT
;
2367 error
= prctl_set_mm(arg2
, arg3
, arg4
, arg5
);
2369 case PR_GET_TID_ADDRESS
:
2370 error
= prctl_get_tid_address(me
, (int __user
**)arg2
);
2372 case PR_SET_CHILD_SUBREAPER
:
2373 me
->signal
->is_child_subreaper
= !!arg2
;
2377 walk_process_tree(me
, propagate_has_child_subreaper
, NULL
);
2379 case PR_GET_CHILD_SUBREAPER
:
2380 error
= put_user(me
->signal
->is_child_subreaper
,
2381 (int __user
*)arg2
);
2383 case PR_SET_NO_NEW_PRIVS
:
2384 if (arg2
!= 1 || arg3
|| arg4
|| arg5
)
2387 task_set_no_new_privs(current
);
2389 case PR_GET_NO_NEW_PRIVS
:
2390 if (arg2
|| arg3
|| arg4
|| arg5
)
2392 return task_no_new_privs(current
) ? 1 : 0;
2393 case PR_GET_THP_DISABLE
:
2394 if (arg2
|| arg3
|| arg4
|| arg5
)
2396 error
= !!test_bit(MMF_DISABLE_THP
, &me
->mm
->flags
);
2398 case PR_SET_THP_DISABLE
:
2399 if (arg3
|| arg4
|| arg5
)
2401 if (down_write_killable(&me
->mm
->mmap_sem
))
2404 set_bit(MMF_DISABLE_THP
, &me
->mm
->flags
);
2406 clear_bit(MMF_DISABLE_THP
, &me
->mm
->flags
);
2407 up_write(&me
->mm
->mmap_sem
);
2409 case PR_MPX_ENABLE_MANAGEMENT
:
2410 if (arg2
|| arg3
|| arg4
|| arg5
)
2412 error
= MPX_ENABLE_MANAGEMENT();
2414 case PR_MPX_DISABLE_MANAGEMENT
:
2415 if (arg2
|| arg3
|| arg4
|| arg5
)
2417 error
= MPX_DISABLE_MANAGEMENT();
2419 case PR_SET_FP_MODE
:
2420 error
= SET_FP_MODE(me
, arg2
);
2422 case PR_GET_FP_MODE
:
2423 error
= GET_FP_MODE(me
);
2426 error
= SVE_SET_VL(arg2
);
2429 error
= SVE_GET_VL();
2431 case PR_GET_SPECULATION_CTRL
:
2432 if (arg3
|| arg4
|| arg5
)
2434 error
= arch_prctl_spec_ctrl_get(me
, arg2
);
2436 case PR_SET_SPECULATION_CTRL
:
2439 error
= arch_prctl_spec_ctrl_set(me
, arg2
, arg3
);
2448 SYSCALL_DEFINE3(getcpu
, unsigned __user
*, cpup
, unsigned __user
*, nodep
,
2449 struct getcpu_cache __user
*, unused
)
2452 int cpu
= raw_smp_processor_id();
2455 err
|= put_user(cpu
, cpup
);
2457 err
|= put_user(cpu_to_node(cpu
), nodep
);
2458 return err
? -EFAULT
: 0;
2462 * do_sysinfo - fill in sysinfo struct
2463 * @info: pointer to buffer to fill
2465 static int do_sysinfo(struct sysinfo
*info
)
2467 unsigned long mem_total
, sav_total
;
2468 unsigned int mem_unit
, bitcount
;
2471 memset(info
, 0, sizeof(struct sysinfo
));
2473 get_monotonic_boottime(&tp
);
2474 info
->uptime
= tp
.tv_sec
+ (tp
.tv_nsec
? 1 : 0);
2476 get_avenrun(info
->loads
, 0, SI_LOAD_SHIFT
- FSHIFT
);
2478 info
->procs
= nr_threads
;
2484 * If the sum of all the available memory (i.e. ram + swap)
2485 * is less than can be stored in a 32 bit unsigned long then
2486 * we can be binary compatible with 2.2.x kernels. If not,
2487 * well, in that case 2.2.x was broken anyways...
2489 * -Erik Andersen <andersee@debian.org>
2492 mem_total
= info
->totalram
+ info
->totalswap
;
2493 if (mem_total
< info
->totalram
|| mem_total
< info
->totalswap
)
2496 mem_unit
= info
->mem_unit
;
2497 while (mem_unit
> 1) {
2500 sav_total
= mem_total
;
2502 if (mem_total
< sav_total
)
2507 * If mem_total did not overflow, multiply all memory values by
2508 * info->mem_unit and set it to 1. This leaves things compatible
2509 * with 2.2.x, and also retains compatibility with earlier 2.4.x
2514 info
->totalram
<<= bitcount
;
2515 info
->freeram
<<= bitcount
;
2516 info
->sharedram
<<= bitcount
;
2517 info
->bufferram
<<= bitcount
;
2518 info
->totalswap
<<= bitcount
;
2519 info
->freeswap
<<= bitcount
;
2520 info
->totalhigh
<<= bitcount
;
2521 info
->freehigh
<<= bitcount
;
2527 SYSCALL_DEFINE1(sysinfo
, struct sysinfo __user
*, info
)
2533 if (copy_to_user(info
, &val
, sizeof(struct sysinfo
)))
2539 #ifdef CONFIG_COMPAT
2540 struct compat_sysinfo
{
2554 char _f
[20-2*sizeof(u32
)-sizeof(int)];
2557 COMPAT_SYSCALL_DEFINE1(sysinfo
, struct compat_sysinfo __user
*, info
)
2563 /* Check to see if any memory value is too large for 32-bit and scale
2566 if (upper_32_bits(s
.totalram
) || upper_32_bits(s
.totalswap
)) {
2569 while (s
.mem_unit
< PAGE_SIZE
) {
2574 s
.totalram
>>= bitcount
;
2575 s
.freeram
>>= bitcount
;
2576 s
.sharedram
>>= bitcount
;
2577 s
.bufferram
>>= bitcount
;
2578 s
.totalswap
>>= bitcount
;
2579 s
.freeswap
>>= bitcount
;
2580 s
.totalhigh
>>= bitcount
;
2581 s
.freehigh
>>= bitcount
;
2584 if (!access_ok(VERIFY_WRITE
, info
, sizeof(struct compat_sysinfo
)) ||
2585 __put_user(s
.uptime
, &info
->uptime
) ||
2586 __put_user(s
.loads
[0], &info
->loads
[0]) ||
2587 __put_user(s
.loads
[1], &info
->loads
[1]) ||
2588 __put_user(s
.loads
[2], &info
->loads
[2]) ||
2589 __put_user(s
.totalram
, &info
->totalram
) ||
2590 __put_user(s
.freeram
, &info
->freeram
) ||
2591 __put_user(s
.sharedram
, &info
->sharedram
) ||
2592 __put_user(s
.bufferram
, &info
->bufferram
) ||
2593 __put_user(s
.totalswap
, &info
->totalswap
) ||
2594 __put_user(s
.freeswap
, &info
->freeswap
) ||
2595 __put_user(s
.procs
, &info
->procs
) ||
2596 __put_user(s
.totalhigh
, &info
->totalhigh
) ||
2597 __put_user(s
.freehigh
, &info
->freehigh
) ||
2598 __put_user(s
.mem_unit
, &info
->mem_unit
))
2603 #endif /* CONFIG_COMPAT */