1 /* Task credentials management - see Documentation/credentials.txt
3 * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public Licence
8 * as published by the Free Software Foundation; either version
9 * 2 of the Licence, or (at your option) any later version.
11 #include <linux/module.h>
12 #include <linux/cred.h>
13 #include <linux/slab.h>
14 #include <linux/sched.h>
15 #include <linux/key.h>
16 #include <linux/keyctl.h>
17 #include <linux/init_task.h>
18 #include <linux/security.h>
19 #include <linux/cn_proc.h>
20 #include "cred-internals.h"
23 #define kdebug(FMT, ...) \
24 printk("[%-5.5s%5u] "FMT"\n", current->comm, current->pid ,##__VA_ARGS__)
26 static inline __attribute__((format(printf
, 1, 2)))
27 void no_printk(const char *fmt
, ...)
30 #define kdebug(FMT, ...) \
31 no_printk("[%-5.5s%5u] "FMT"\n", current->comm, current->pid ,##__VA_ARGS__)
34 static struct kmem_cache
*cred_jar
;
37 * The common credentials for the initial task's thread group
40 static struct thread_group_cred init_tgcred
= {
41 .usage
= ATOMIC_INIT(2),
43 .lock
= SPIN_LOCK_UNLOCKED
,
48 * The initial credentials for the initial task
50 struct cred init_cred
= {
51 .usage
= ATOMIC_INIT(4),
52 #ifdef CONFIG_DEBUG_CREDENTIALS
53 .subscribers
= ATOMIC_INIT(2),
56 .securebits
= SECUREBITS_DEFAULT
,
57 .cap_inheritable
= CAP_INIT_INH_SET
,
58 .cap_permitted
= CAP_FULL_SET
,
59 .cap_effective
= CAP_INIT_EFF_SET
,
60 .cap_bset
= CAP_INIT_BSET
,
62 .group_info
= &init_groups
,
64 .tgcred
= &init_tgcred
,
68 static inline void set_cred_subscribers(struct cred
*cred
, int n
)
70 #ifdef CONFIG_DEBUG_CREDENTIALS
71 atomic_set(&cred
->subscribers
, n
);
75 static inline int read_cred_subscribers(const struct cred
*cred
)
77 #ifdef CONFIG_DEBUG_CREDENTIALS
78 return atomic_read(&cred
->subscribers
);
84 static inline void alter_cred_subscribers(const struct cred
*_cred
, int n
)
86 #ifdef CONFIG_DEBUG_CREDENTIALS
87 struct cred
*cred
= (struct cred
*) _cred
;
89 atomic_add(n
, &cred
->subscribers
);
94 * Dispose of the shared task group credentials
97 static void release_tgcred_rcu(struct rcu_head
*rcu
)
99 struct thread_group_cred
*tgcred
=
100 container_of(rcu
, struct thread_group_cred
, rcu
);
102 BUG_ON(atomic_read(&tgcred
->usage
) != 0);
104 key_put(tgcred
->session_keyring
);
105 key_put(tgcred
->process_keyring
);
111 * Release a set of thread group credentials.
113 static void release_tgcred(struct cred
*cred
)
116 struct thread_group_cred
*tgcred
= cred
->tgcred
;
118 if (atomic_dec_and_test(&tgcred
->usage
))
119 call_rcu(&tgcred
->rcu
, release_tgcred_rcu
);
124 * The RCU callback to actually dispose of a set of credentials
126 static void put_cred_rcu(struct rcu_head
*rcu
)
128 struct cred
*cred
= container_of(rcu
, struct cred
, rcu
);
130 kdebug("put_cred_rcu(%p)", cred
);
132 #ifdef CONFIG_DEBUG_CREDENTIALS
133 if (cred
->magic
!= CRED_MAGIC_DEAD
||
134 atomic_read(&cred
->usage
) != 0 ||
135 read_cred_subscribers(cred
) != 0)
136 panic("CRED: put_cred_rcu() sees %p with"
137 " mag %x, put %p, usage %d, subscr %d\n",
138 cred
, cred
->magic
, cred
->put_addr
,
139 atomic_read(&cred
->usage
),
140 read_cred_subscribers(cred
));
142 if (atomic_read(&cred
->usage
) != 0)
143 panic("CRED: put_cred_rcu() sees %p with usage %d\n",
144 cred
, atomic_read(&cred
->usage
));
147 security_cred_free(cred
);
148 key_put(cred
->thread_keyring
);
149 key_put(cred
->request_key_auth
);
150 release_tgcred(cred
);
151 if (cred
->group_info
)
152 put_group_info(cred
->group_info
);
153 free_uid(cred
->user
);
154 kmem_cache_free(cred_jar
, cred
);
158 * __put_cred - Destroy a set of credentials
159 * @cred: The record to release
161 * Destroy a set of credentials on which no references remain.
163 void __put_cred(struct cred
*cred
)
165 kdebug("__put_cred(%p{%d,%d})", cred
,
166 atomic_read(&cred
->usage
),
167 read_cred_subscribers(cred
));
169 BUG_ON(atomic_read(&cred
->usage
) != 0);
170 #ifdef CONFIG_DEBUG_CREDENTIALS
171 BUG_ON(read_cred_subscribers(cred
) != 0);
172 cred
->magic
= CRED_MAGIC_DEAD
;
173 cred
->put_addr
= __builtin_return_address(0);
175 BUG_ON(cred
== current
->cred
);
176 BUG_ON(cred
== current
->real_cred
);
178 call_rcu(&cred
->rcu
, put_cred_rcu
);
180 EXPORT_SYMBOL(__put_cred
);
183 * Clean up a task's credentials when it exits
185 void exit_creds(struct task_struct
*tsk
)
189 kdebug("exit_creds(%u,%p,%p,{%d,%d})", tsk
->pid
, tsk
->real_cred
, tsk
->cred
,
190 atomic_read(&tsk
->cred
->usage
),
191 read_cred_subscribers(tsk
->cred
));
193 cred
= (struct cred
*) tsk
->real_cred
;
194 tsk
->real_cred
= NULL
;
195 validate_creds(cred
);
196 alter_cred_subscribers(cred
, -1);
199 cred
= (struct cred
*) tsk
->cred
;
201 validate_creds(cred
);
202 alter_cred_subscribers(cred
, -1);
205 cred
= (struct cred
*) tsk
->replacement_session_keyring
;
207 tsk
->replacement_session_keyring
= NULL
;
208 validate_creds(cred
);
214 * Allocate blank credentials, such that the credentials can be filled in at a
215 * later date without risk of ENOMEM.
217 struct cred
*cred_alloc_blank(void)
221 new = kmem_cache_zalloc(cred_jar
, GFP_KERNEL
);
226 new->tgcred
= kzalloc(sizeof(*new->tgcred
), GFP_KERNEL
);
228 kmem_cache_free(cred_jar
, new);
231 atomic_set(&new->tgcred
->usage
, 1);
234 atomic_set(&new->usage
, 1);
236 if (security_cred_alloc_blank(new, GFP_KERNEL
) < 0)
239 #ifdef CONFIG_DEBUG_CREDENTIALS
240 new->magic
= CRED_MAGIC
;
250 * prepare_creds - Prepare a new set of credentials for modification
252 * Prepare a new set of task credentials for modification. A task's creds
253 * shouldn't generally be modified directly, therefore this function is used to
254 * prepare a new copy, which the caller then modifies and then commits by
255 * calling commit_creds().
257 * Preparation involves making a copy of the objective creds for modification.
259 * Returns a pointer to the new creds-to-be if successful, NULL otherwise.
261 * Call commit_creds() or abort_creds() to clean up.
263 struct cred
*prepare_creds(void)
265 struct task_struct
*task
= current
;
266 const struct cred
*old
;
269 validate_process_creds();
271 new = kmem_cache_alloc(cred_jar
, GFP_KERNEL
);
275 kdebug("prepare_creds() alloc %p", new);
278 memcpy(new, old
, sizeof(struct cred
));
280 atomic_set(&new->usage
, 1);
281 set_cred_subscribers(new, 0);
282 get_group_info(new->group_info
);
286 key_get(new->thread_keyring
);
287 key_get(new->request_key_auth
);
288 atomic_inc(&new->tgcred
->usage
);
291 #ifdef CONFIG_SECURITY
292 new->security
= NULL
;
295 if (security_prepare_creds(new, old
, GFP_KERNEL
) < 0)
304 EXPORT_SYMBOL(prepare_creds
);
307 * Prepare credentials for current to perform an execve()
308 * - The caller must hold current->cred_guard_mutex
310 struct cred
*prepare_exec_creds(void)
312 struct thread_group_cred
*tgcred
= NULL
;
316 tgcred
= kmalloc(sizeof(*tgcred
), GFP_KERNEL
);
321 new = prepare_creds();
328 /* newly exec'd tasks don't get a thread keyring */
329 key_put(new->thread_keyring
);
330 new->thread_keyring
= NULL
;
332 /* create a new per-thread-group creds for all this set of threads to
334 memcpy(tgcred
, new->tgcred
, sizeof(struct thread_group_cred
));
336 atomic_set(&tgcred
->usage
, 1);
337 spin_lock_init(&tgcred
->lock
);
339 /* inherit the session keyring; new process keyring */
340 key_get(tgcred
->session_keyring
);
341 tgcred
->process_keyring
= NULL
;
344 new->tgcred
= tgcred
;
351 * prepare new credentials for the usermode helper dispatcher
353 struct cred
*prepare_usermodehelper_creds(void)
356 struct thread_group_cred
*tgcred
= NULL
;
361 tgcred
= kzalloc(sizeof(*new->tgcred
), GFP_ATOMIC
);
366 new = kmem_cache_alloc(cred_jar
, GFP_ATOMIC
);
370 kdebug("prepare_usermodehelper_creds() alloc %p", new);
372 memcpy(new, &init_cred
, sizeof(struct cred
));
374 atomic_set(&new->usage
, 1);
375 set_cred_subscribers(new, 0);
376 get_group_info(new->group_info
);
380 new->thread_keyring
= NULL
;
381 new->request_key_auth
= NULL
;
382 new->jit_keyring
= KEY_REQKEY_DEFL_DEFAULT
;
384 atomic_set(&tgcred
->usage
, 1);
385 spin_lock_init(&tgcred
->lock
);
386 new->tgcred
= tgcred
;
389 #ifdef CONFIG_SECURITY
390 new->security
= NULL
;
392 if (security_prepare_creds(new, &init_cred
, GFP_ATOMIC
) < 0)
396 BUG_ON(atomic_read(&new->usage
) != 1);
405 * Copy credentials for the new process created by fork()
407 * We share if we can, but under some circumstances we have to generate a new
410 * The new process gets the current process's subjective credentials as its
411 * objective and subjective credentials
413 int copy_creds(struct task_struct
*p
, unsigned long clone_flags
)
416 struct thread_group_cred
*tgcred
;
421 mutex_init(&p
->cred_guard_mutex
);
425 !p
->cred
->thread_keyring
&&
427 clone_flags
& CLONE_THREAD
429 p
->real_cred
= get_cred(p
->cred
);
431 alter_cred_subscribers(p
->cred
, 2);
432 kdebug("share_creds(%p{%d,%d})",
433 p
->cred
, atomic_read(&p
->cred
->usage
),
434 read_cred_subscribers(p
->cred
));
435 atomic_inc(&p
->cred
->user
->processes
);
439 new = prepare_creds();
443 if (clone_flags
& CLONE_NEWUSER
) {
444 ret
= create_user_ns(new);
450 /* new threads get their own thread keyrings if their parent already
452 if (new->thread_keyring
) {
453 key_put(new->thread_keyring
);
454 new->thread_keyring
= NULL
;
455 if (clone_flags
& CLONE_THREAD
)
456 install_thread_keyring_to_cred(new);
459 /* we share the process and session keyrings between all the threads in
460 * a process - this is slightly icky as we violate COW credentials a
462 if (!(clone_flags
& CLONE_THREAD
)) {
463 tgcred
= kmalloc(sizeof(*tgcred
), GFP_KERNEL
);
468 atomic_set(&tgcred
->usage
, 1);
469 spin_lock_init(&tgcred
->lock
);
470 tgcred
->process_keyring
= NULL
;
471 tgcred
->session_keyring
= key_get(new->tgcred
->session_keyring
);
474 new->tgcred
= tgcred
;
478 atomic_inc(&new->user
->processes
);
479 p
->cred
= p
->real_cred
= get_cred(new);
480 alter_cred_subscribers(new, 2);
490 * commit_creds - Install new credentials upon the current task
491 * @new: The credentials to be assigned
493 * Install a new set of credentials to the current task, using RCU to replace
494 * the old set. Both the objective and the subjective credentials pointers are
495 * updated. This function may not be called if the subjective credentials are
496 * in an overridden state.
498 * This function eats the caller's reference to the new credentials.
500 * Always returns 0 thus allowing this function to be tail-called at the end
501 * of, say, sys_setgid().
503 int commit_creds(struct cred
*new)
505 struct task_struct
*task
= current
;
506 const struct cred
*old
= task
->real_cred
;
508 kdebug("commit_creds(%p{%d,%d})", new,
509 atomic_read(&new->usage
),
510 read_cred_subscribers(new));
512 BUG_ON(task
->cred
!= old
);
513 #ifdef CONFIG_DEBUG_CREDENTIALS
514 BUG_ON(read_cred_subscribers(old
) < 2);
518 BUG_ON(atomic_read(&new->usage
) < 1);
520 security_commit_creds(new, old
);
522 get_cred(new); /* we will require a ref for the subj creds too */
524 /* dumpability changes */
525 if (old
->euid
!= new->euid
||
526 old
->egid
!= new->egid
||
527 old
->fsuid
!= new->fsuid
||
528 old
->fsgid
!= new->fsgid
||
529 !cap_issubset(new->cap_permitted
, old
->cap_permitted
)) {
531 set_dumpable(task
->mm
, suid_dumpable
);
532 task
->pdeath_signal
= 0;
536 /* alter the thread keyring */
537 if (new->fsuid
!= old
->fsuid
)
538 key_fsuid_changed(task
);
539 if (new->fsgid
!= old
->fsgid
)
540 key_fsgid_changed(task
);
543 * - What if a process setreuid()'s and this brings the
544 * new uid over his NPROC rlimit? We can check this now
545 * cheaply with the new uid cache, so if it matters
546 * we should be checking for it. -DaveM
548 alter_cred_subscribers(new, 2);
549 if (new->user
!= old
->user
)
550 atomic_inc(&new->user
->processes
);
551 rcu_assign_pointer(task
->real_cred
, new);
552 rcu_assign_pointer(task
->cred
, new);
553 if (new->user
!= old
->user
)
554 atomic_dec(&old
->user
->processes
);
555 alter_cred_subscribers(old
, -2);
557 sched_switch_user(task
);
559 /* send notifications */
560 if (new->uid
!= old
->uid
||
561 new->euid
!= old
->euid
||
562 new->suid
!= old
->suid
||
563 new->fsuid
!= old
->fsuid
)
564 proc_id_connector(task
, PROC_EVENT_UID
);
566 if (new->gid
!= old
->gid
||
567 new->egid
!= old
->egid
||
568 new->sgid
!= old
->sgid
||
569 new->fsgid
!= old
->fsgid
)
570 proc_id_connector(task
, PROC_EVENT_GID
);
572 /* release the old obj and subj refs both */
577 EXPORT_SYMBOL(commit_creds
);
580 * abort_creds - Discard a set of credentials and unlock the current task
581 * @new: The credentials that were going to be applied
583 * Discard a set of credentials that were under construction and unlock the
586 void abort_creds(struct cred
*new)
588 kdebug("abort_creds(%p{%d,%d})", new,
589 atomic_read(&new->usage
),
590 read_cred_subscribers(new));
592 #ifdef CONFIG_DEBUG_CREDENTIALS
593 BUG_ON(read_cred_subscribers(new) != 0);
595 BUG_ON(atomic_read(&new->usage
) < 1);
598 EXPORT_SYMBOL(abort_creds
);
601 * override_creds - Override the current process's subjective credentials
602 * @new: The credentials to be assigned
604 * Install a set of temporary override subjective credentials on the current
605 * process, returning the old set for later reversion.
607 const struct cred
*override_creds(const struct cred
*new)
609 const struct cred
*old
= current
->cred
;
611 kdebug("override_creds(%p{%d,%d})", new,
612 atomic_read(&new->usage
),
613 read_cred_subscribers(new));
618 alter_cred_subscribers(new, 1);
619 rcu_assign_pointer(current
->cred
, new);
620 alter_cred_subscribers(old
, -1);
622 kdebug("override_creds() = %p{%d,%d}", old
,
623 atomic_read(&old
->usage
),
624 read_cred_subscribers(old
));
627 EXPORT_SYMBOL(override_creds
);
630 * revert_creds - Revert a temporary subjective credentials override
631 * @old: The credentials to be restored
633 * Revert a temporary set of override subjective credentials to an old set,
634 * discarding the override set.
636 void revert_creds(const struct cred
*old
)
638 const struct cred
*override
= current
->cred
;
640 kdebug("revert_creds(%p{%d,%d})", old
,
641 atomic_read(&old
->usage
),
642 read_cred_subscribers(old
));
645 validate_creds(override
);
646 alter_cred_subscribers(old
, 1);
647 rcu_assign_pointer(current
->cred
, old
);
648 alter_cred_subscribers(override
, -1);
651 EXPORT_SYMBOL(revert_creds
);
654 * initialise the credentials stuff
656 void __init
cred_init(void)
658 /* allocate a slab in which we can store credentials */
659 cred_jar
= kmem_cache_create("cred_jar", sizeof(struct cred
),
660 0, SLAB_HWCACHE_ALIGN
|SLAB_PANIC
, NULL
);
664 * prepare_kernel_cred - Prepare a set of credentials for a kernel service
665 * @daemon: A userspace daemon to be used as a reference
667 * Prepare a set of credentials for a kernel service. This can then be used to
668 * override a task's own credentials so that work can be done on behalf of that
669 * task that requires a different subjective context.
671 * @daemon is used to provide a base for the security record, but can be NULL.
672 * If @daemon is supplied, then the security data will be derived from that;
673 * otherwise they'll be set to 0 and no groups, full capabilities and no keys.
675 * The caller may change these controls afterwards if desired.
677 * Returns the new credentials or NULL if out of memory.
679 * Does not take, and does not return holding current->cred_replace_mutex.
681 struct cred
*prepare_kernel_cred(struct task_struct
*daemon
)
683 const struct cred
*old
;
686 new = kmem_cache_alloc(cred_jar
, GFP_KERNEL
);
690 kdebug("prepare_kernel_cred() alloc %p", new);
693 old
= get_task_cred(daemon
);
695 old
= get_cred(&init_cred
);
701 get_group_info(new->group_info
);
704 atomic_inc(&init_tgcred
.usage
);
705 new->tgcred
= &init_tgcred
;
706 new->request_key_auth
= NULL
;
707 new->thread_keyring
= NULL
;
708 new->jit_keyring
= KEY_REQKEY_DEFL_THREAD_KEYRING
;
711 #ifdef CONFIG_SECURITY
712 new->security
= NULL
;
714 if (security_prepare_creds(new, old
, GFP_KERNEL
) < 0)
717 atomic_set(&new->usage
, 1);
718 set_cred_subscribers(new, 0);
728 EXPORT_SYMBOL(prepare_kernel_cred
);
731 * set_security_override - Set the security ID in a set of credentials
732 * @new: The credentials to alter
733 * @secid: The LSM security ID to set
735 * Set the LSM security ID in a set of credentials so that the subjective
736 * security is overridden when an alternative set of credentials is used.
738 int set_security_override(struct cred
*new, u32 secid
)
740 return security_kernel_act_as(new, secid
);
742 EXPORT_SYMBOL(set_security_override
);
745 * set_security_override_from_ctx - Set the security ID in a set of credentials
746 * @new: The credentials to alter
747 * @secctx: The LSM security context to generate the security ID from.
749 * Set the LSM security ID in a set of credentials so that the subjective
750 * security is overridden when an alternative set of credentials is used. The
751 * security ID is specified in string form as a security context to be
752 * interpreted by the LSM.
754 int set_security_override_from_ctx(struct cred
*new, const char *secctx
)
759 ret
= security_secctx_to_secid(secctx
, strlen(secctx
), &secid
);
763 return set_security_override(new, secid
);
765 EXPORT_SYMBOL(set_security_override_from_ctx
);
768 * set_create_files_as - Set the LSM file create context in a set of credentials
769 * @new: The credentials to alter
770 * @inode: The inode to take the context from
772 * Change the LSM file creation context in a set of credentials to be the same
773 * as the object context of the specified inode, so that the new inodes have
774 * the same MAC context as that inode.
776 int set_create_files_as(struct cred
*new, struct inode
*inode
)
778 new->fsuid
= inode
->i_uid
;
779 new->fsgid
= inode
->i_gid
;
780 return security_kernel_create_files_as(new, inode
);
782 EXPORT_SYMBOL(set_create_files_as
);
784 #ifdef CONFIG_DEBUG_CREDENTIALS
786 bool creds_are_invalid(const struct cred
*cred
)
788 if (cred
->magic
!= CRED_MAGIC
)
790 if (atomic_read(&cred
->usage
) < atomic_read(&cred
->subscribers
))
792 #ifdef CONFIG_SECURITY_SELINUX
793 if (selinux_is_enabled()) {
794 if ((unsigned long) cred
->security
< PAGE_SIZE
)
796 if ((*(u32
*)cred
->security
& 0xffffff00) ==
797 (POISON_FREE
<< 24 | POISON_FREE
<< 16 | POISON_FREE
<< 8))
803 EXPORT_SYMBOL(creds_are_invalid
);
806 * dump invalid credentials
808 static void dump_invalid_creds(const struct cred
*cred
, const char *label
,
809 const struct task_struct
*tsk
)
811 printk(KERN_ERR
"CRED: %s credentials: %p %s%s%s\n",
813 cred
== &init_cred
? "[init]" : "",
814 cred
== tsk
->real_cred
? "[real]" : "",
815 cred
== tsk
->cred
? "[eff]" : "");
816 printk(KERN_ERR
"CRED: ->magic=%x, put_addr=%p\n",
817 cred
->magic
, cred
->put_addr
);
818 printk(KERN_ERR
"CRED: ->usage=%d, subscr=%d\n",
819 atomic_read(&cred
->usage
),
820 read_cred_subscribers(cred
));
821 printk(KERN_ERR
"CRED: ->*uid = { %d,%d,%d,%d }\n",
822 cred
->uid
, cred
->euid
, cred
->suid
, cred
->fsuid
);
823 printk(KERN_ERR
"CRED: ->*gid = { %d,%d,%d,%d }\n",
824 cred
->gid
, cred
->egid
, cred
->sgid
, cred
->fsgid
);
825 #ifdef CONFIG_SECURITY
826 printk(KERN_ERR
"CRED: ->security is %p\n", cred
->security
);
827 if ((unsigned long) cred
->security
>= PAGE_SIZE
&&
828 (((unsigned long) cred
->security
& 0xffffff00) !=
829 (POISON_FREE
<< 24 | POISON_FREE
<< 16 | POISON_FREE
<< 8)))
830 printk(KERN_ERR
"CRED: ->security {%x, %x}\n",
831 ((u32
*)cred
->security
)[0],
832 ((u32
*)cred
->security
)[1]);
837 * report use of invalid credentials
839 void __invalid_creds(const struct cred
*cred
, const char *file
, unsigned line
)
841 printk(KERN_ERR
"CRED: Invalid credentials\n");
842 printk(KERN_ERR
"CRED: At %s:%u\n", file
, line
);
843 dump_invalid_creds(cred
, "Specified", current
);
846 EXPORT_SYMBOL(__invalid_creds
);
849 * check the credentials on a process
851 void __validate_process_creds(struct task_struct
*tsk
,
852 const char *file
, unsigned line
)
854 if (tsk
->cred
== tsk
->real_cred
) {
855 if (unlikely(read_cred_subscribers(tsk
->cred
) < 2 ||
856 creds_are_invalid(tsk
->cred
)))
859 if (unlikely(read_cred_subscribers(tsk
->real_cred
) < 1 ||
860 read_cred_subscribers(tsk
->cred
) < 1 ||
861 creds_are_invalid(tsk
->real_cred
) ||
862 creds_are_invalid(tsk
->cred
)))
868 printk(KERN_ERR
"CRED: Invalid process credentials\n");
869 printk(KERN_ERR
"CRED: At %s:%u\n", file
, line
);
871 dump_invalid_creds(tsk
->real_cred
, "Real", tsk
);
872 if (tsk
->cred
!= tsk
->real_cred
)
873 dump_invalid_creds(tsk
->cred
, "Effective", tsk
);
875 printk(KERN_ERR
"CRED: Effective creds == Real creds\n");
878 EXPORT_SYMBOL(__validate_process_creds
);
881 * check creds for do_exit()
883 void validate_creds_for_do_exit(struct task_struct
*tsk
)
885 kdebug("validate_creds_for_do_exit(%p,%p{%d,%d})",
886 tsk
->real_cred
, tsk
->cred
,
887 atomic_read(&tsk
->cred
->usage
),
888 read_cred_subscribers(tsk
->cred
));
890 __validate_process_creds(tsk
, __FILE__
, __LINE__
);
893 #endif /* CONFIG_DEBUG_CREDENTIALS */