1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* Task credentials management - see Documentation/security/credentials.rst
4 * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
7 #include <linux/export.h>
8 #include <linux/cred.h>
9 #include <linux/slab.h>
10 #include <linux/sched.h>
11 #include <linux/sched/coredump.h>
12 #include <linux/key.h>
13 #include <linux/keyctl.h>
14 #include <linux/init_task.h>
15 #include <linux/security.h>
16 #include <linux/binfmts.h>
17 #include <linux/cn_proc.h>
18 #include <linux/uidgid.h>
21 #define kdebug(FMT, ...) \
22 printk("[%-5.5s%5u] " FMT "\n", \
23 current->comm, current->pid, ##__VA_ARGS__)
25 #define kdebug(FMT, ...) \
28 no_printk("[%-5.5s%5u] " FMT "\n", \
29 current->comm, current->pid, ##__VA_ARGS__); \
33 static struct kmem_cache
*cred_jar
;
35 /* init to 2 - one for init_task, one to ensure it is never freed */
36 struct group_info init_groups
= { .usage
= ATOMIC_INIT(2) };
39 * The initial credentials for the initial task
41 struct cred init_cred
= {
42 .usage
= ATOMIC_INIT(4),
43 #ifdef CONFIG_DEBUG_CREDENTIALS
44 .subscribers
= ATOMIC_INIT(2),
47 .uid
= GLOBAL_ROOT_UID
,
48 .gid
= GLOBAL_ROOT_GID
,
49 .suid
= GLOBAL_ROOT_UID
,
50 .sgid
= GLOBAL_ROOT_GID
,
51 .euid
= GLOBAL_ROOT_UID
,
52 .egid
= GLOBAL_ROOT_GID
,
53 .fsuid
= GLOBAL_ROOT_UID
,
54 .fsgid
= GLOBAL_ROOT_GID
,
55 .securebits
= SECUREBITS_DEFAULT
,
56 .cap_inheritable
= CAP_EMPTY_SET
,
57 .cap_permitted
= CAP_FULL_SET
,
58 .cap_effective
= CAP_FULL_SET
,
59 .cap_bset
= CAP_FULL_SET
,
61 .user_ns
= &init_user_ns
,
62 .group_info
= &init_groups
,
65 static inline void set_cred_subscribers(struct cred
*cred
, int n
)
67 #ifdef CONFIG_DEBUG_CREDENTIALS
68 atomic_set(&cred
->subscribers
, n
);
72 static inline int read_cred_subscribers(const struct cred
*cred
)
74 #ifdef CONFIG_DEBUG_CREDENTIALS
75 return atomic_read(&cred
->subscribers
);
81 static inline void alter_cred_subscribers(const struct cred
*_cred
, int n
)
83 #ifdef CONFIG_DEBUG_CREDENTIALS
84 struct cred
*cred
= (struct cred
*) _cred
;
86 atomic_add(n
, &cred
->subscribers
);
91 * The RCU callback to actually dispose of a set of credentials
93 static void put_cred_rcu(struct rcu_head
*rcu
)
95 struct cred
*cred
= container_of(rcu
, struct cred
, rcu
);
97 kdebug("put_cred_rcu(%p)", cred
);
99 #ifdef CONFIG_DEBUG_CREDENTIALS
100 if (cred
->magic
!= CRED_MAGIC_DEAD
||
101 atomic_read(&cred
->usage
) != 0 ||
102 read_cred_subscribers(cred
) != 0)
103 panic("CRED: put_cred_rcu() sees %p with"
104 " mag %x, put %p, usage %d, subscr %d\n",
105 cred
, cred
->magic
, cred
->put_addr
,
106 atomic_read(&cred
->usage
),
107 read_cred_subscribers(cred
));
109 if (atomic_read(&cred
->usage
) != 0)
110 panic("CRED: put_cred_rcu() sees %p with usage %d\n",
111 cred
, atomic_read(&cred
->usage
));
114 security_cred_free(cred
);
115 key_put(cred
->session_keyring
);
116 key_put(cred
->process_keyring
);
117 key_put(cred
->thread_keyring
);
118 key_put(cred
->request_key_auth
);
119 if (cred
->group_info
)
120 put_group_info(cred
->group_info
);
121 free_uid(cred
->user
);
122 put_user_ns(cred
->user_ns
);
123 kmem_cache_free(cred_jar
, cred
);
127 * __put_cred - Destroy a set of credentials
128 * @cred: The record to release
130 * Destroy a set of credentials on which no references remain.
132 void __put_cred(struct cred
*cred
)
134 kdebug("__put_cred(%p{%d,%d})", cred
,
135 atomic_read(&cred
->usage
),
136 read_cred_subscribers(cred
));
138 BUG_ON(atomic_read(&cred
->usage
) != 0);
139 #ifdef CONFIG_DEBUG_CREDENTIALS
140 BUG_ON(read_cred_subscribers(cred
) != 0);
141 cred
->magic
= CRED_MAGIC_DEAD
;
142 cred
->put_addr
= __builtin_return_address(0);
144 BUG_ON(cred
== current
->cred
);
145 BUG_ON(cred
== current
->real_cred
);
147 call_rcu(&cred
->rcu
, put_cred_rcu
);
149 EXPORT_SYMBOL(__put_cred
);
152 * Clean up a task's credentials when it exits
154 void exit_creds(struct task_struct
*tsk
)
158 kdebug("exit_creds(%u,%p,%p,{%d,%d})", tsk
->pid
, tsk
->real_cred
, tsk
->cred
,
159 atomic_read(&tsk
->cred
->usage
),
160 read_cred_subscribers(tsk
->cred
));
162 cred
= (struct cred
*) tsk
->real_cred
;
163 tsk
->real_cred
= NULL
;
164 validate_creds(cred
);
165 alter_cred_subscribers(cred
, -1);
168 cred
= (struct cred
*) tsk
->cred
;
170 validate_creds(cred
);
171 alter_cred_subscribers(cred
, -1);
176 * get_task_cred - Get another task's objective credentials
177 * @task: The task to query
179 * Get the objective credentials of a task, pinning them so that they can't go
180 * away. Accessing a task's credentials directly is not permitted.
182 * The caller must also make sure task doesn't get deleted, either by holding a
183 * ref on task or by holding tasklist_lock to prevent it from being unlinked.
185 const struct cred
*get_task_cred(struct task_struct
*task
)
187 const struct cred
*cred
;
192 cred
= __task_cred((task
));
194 } while (!get_cred_rcu(cred
));
199 EXPORT_SYMBOL(get_task_cred
);
202 * Allocate blank credentials, such that the credentials can be filled in at a
203 * later date without risk of ENOMEM.
205 struct cred
*cred_alloc_blank(void)
209 new = kmem_cache_zalloc(cred_jar
, GFP_KERNEL
);
213 atomic_set(&new->usage
, 1);
214 #ifdef CONFIG_DEBUG_CREDENTIALS
215 new->magic
= CRED_MAGIC
;
218 if (security_cred_alloc_blank(new, GFP_KERNEL
) < 0)
229 * prepare_creds - Prepare a new set of credentials for modification
231 * Prepare a new set of task credentials for modification. A task's creds
232 * shouldn't generally be modified directly, therefore this function is used to
233 * prepare a new copy, which the caller then modifies and then commits by
234 * calling commit_creds().
236 * Preparation involves making a copy of the objective creds for modification.
238 * Returns a pointer to the new creds-to-be if successful, NULL otherwise.
240 * Call commit_creds() or abort_creds() to clean up.
242 struct cred
*prepare_creds(void)
244 struct task_struct
*task
= current
;
245 const struct cred
*old
;
248 validate_process_creds();
250 new = kmem_cache_alloc(cred_jar
, GFP_KERNEL
);
254 kdebug("prepare_creds() alloc %p", new);
257 memcpy(new, old
, sizeof(struct cred
));
259 atomic_set(&new->usage
, 1);
260 set_cred_subscribers(new, 0);
261 get_group_info(new->group_info
);
263 get_user_ns(new->user_ns
);
266 key_get(new->session_keyring
);
267 key_get(new->process_keyring
);
268 key_get(new->thread_keyring
);
269 key_get(new->request_key_auth
);
272 #ifdef CONFIG_SECURITY
273 new->security
= NULL
;
276 if (security_prepare_creds(new, old
, GFP_KERNEL
) < 0)
285 EXPORT_SYMBOL(prepare_creds
);
288 * Prepare credentials for current to perform an execve()
289 * - The caller must hold ->cred_guard_mutex
291 struct cred
*prepare_exec_creds(void)
295 new = prepare_creds();
300 /* newly exec'd tasks don't get a thread keyring */
301 key_put(new->thread_keyring
);
302 new->thread_keyring
= NULL
;
304 /* inherit the session keyring; new process keyring */
305 key_put(new->process_keyring
);
306 new->process_keyring
= NULL
;
313 * Copy credentials for the new process created by fork()
315 * We share if we can, but under some circumstances we have to generate a new
318 * The new process gets the current process's subjective credentials as its
319 * objective and subjective credentials
321 int copy_creds(struct task_struct
*p
, unsigned long clone_flags
)
328 !p
->cred
->thread_keyring
&&
330 clone_flags
& CLONE_THREAD
332 p
->real_cred
= get_cred(p
->cred
);
334 alter_cred_subscribers(p
->cred
, 2);
335 kdebug("share_creds(%p{%d,%d})",
336 p
->cred
, atomic_read(&p
->cred
->usage
),
337 read_cred_subscribers(p
->cred
));
338 atomic_inc(&p
->cred
->user
->processes
);
342 new = prepare_creds();
346 if (clone_flags
& CLONE_NEWUSER
) {
347 ret
= create_user_ns(new);
353 /* new threads get their own thread keyrings if their parent already
355 if (new->thread_keyring
) {
356 key_put(new->thread_keyring
);
357 new->thread_keyring
= NULL
;
358 if (clone_flags
& CLONE_THREAD
)
359 install_thread_keyring_to_cred(new);
362 /* The process keyring is only shared between the threads in a process;
363 * anything outside of those threads doesn't inherit.
365 if (!(clone_flags
& CLONE_THREAD
)) {
366 key_put(new->process_keyring
);
367 new->process_keyring
= NULL
;
371 atomic_inc(&new->user
->processes
);
372 p
->cred
= p
->real_cred
= get_cred(new);
373 alter_cred_subscribers(new, 2);
382 static bool cred_cap_issubset(const struct cred
*set
, const struct cred
*subset
)
384 const struct user_namespace
*set_ns
= set
->user_ns
;
385 const struct user_namespace
*subset_ns
= subset
->user_ns
;
387 /* If the two credentials are in the same user namespace see if
388 * the capabilities of subset are a subset of set.
390 if (set_ns
== subset_ns
)
391 return cap_issubset(subset
->cap_permitted
, set
->cap_permitted
);
393 /* The credentials are in a different user namespaces
394 * therefore one is a subset of the other only if a set is an
395 * ancestor of subset and set->euid is owner of subset or one
396 * of subsets ancestors.
398 for (;subset_ns
!= &init_user_ns
; subset_ns
= subset_ns
->parent
) {
399 if ((set_ns
== subset_ns
->parent
) &&
400 uid_eq(subset_ns
->owner
, set
->euid
))
408 * commit_creds - Install new credentials upon the current task
409 * @new: The credentials to be assigned
411 * Install a new set of credentials to the current task, using RCU to replace
412 * the old set. Both the objective and the subjective credentials pointers are
413 * updated. This function may not be called if the subjective credentials are
414 * in an overridden state.
416 * This function eats the caller's reference to the new credentials.
418 * Always returns 0 thus allowing this function to be tail-called at the end
419 * of, say, sys_setgid().
421 int commit_creds(struct cred
*new)
423 struct task_struct
*task
= current
;
424 const struct cred
*old
= task
->real_cred
;
426 kdebug("commit_creds(%p{%d,%d})", new,
427 atomic_read(&new->usage
),
428 read_cred_subscribers(new));
430 BUG_ON(task
->cred
!= old
);
431 #ifdef CONFIG_DEBUG_CREDENTIALS
432 BUG_ON(read_cred_subscribers(old
) < 2);
436 BUG_ON(atomic_read(&new->usage
) < 1);
438 get_cred(new); /* we will require a ref for the subj creds too */
440 /* dumpability changes */
441 if (!uid_eq(old
->euid
, new->euid
) ||
442 !gid_eq(old
->egid
, new->egid
) ||
443 !uid_eq(old
->fsuid
, new->fsuid
) ||
444 !gid_eq(old
->fsgid
, new->fsgid
) ||
445 !cred_cap_issubset(old
, new)) {
447 set_dumpable(task
->mm
, suid_dumpable
);
448 task
->pdeath_signal
= 0;
452 /* alter the thread keyring */
453 if (!uid_eq(new->fsuid
, old
->fsuid
))
454 key_fsuid_changed(task
);
455 if (!gid_eq(new->fsgid
, old
->fsgid
))
456 key_fsgid_changed(task
);
459 * RLIMIT_NPROC limits on user->processes have already been checked
462 alter_cred_subscribers(new, 2);
463 if (new->user
!= old
->user
)
464 atomic_inc(&new->user
->processes
);
465 rcu_assign_pointer(task
->real_cred
, new);
466 rcu_assign_pointer(task
->cred
, new);
467 if (new->user
!= old
->user
)
468 atomic_dec(&old
->user
->processes
);
469 alter_cred_subscribers(old
, -2);
471 /* send notifications */
472 if (!uid_eq(new->uid
, old
->uid
) ||
473 !uid_eq(new->euid
, old
->euid
) ||
474 !uid_eq(new->suid
, old
->suid
) ||
475 !uid_eq(new->fsuid
, old
->fsuid
))
476 proc_id_connector(task
, PROC_EVENT_UID
);
478 if (!gid_eq(new->gid
, old
->gid
) ||
479 !gid_eq(new->egid
, old
->egid
) ||
480 !gid_eq(new->sgid
, old
->sgid
) ||
481 !gid_eq(new->fsgid
, old
->fsgid
))
482 proc_id_connector(task
, PROC_EVENT_GID
);
484 /* release the old obj and subj refs both */
489 EXPORT_SYMBOL(commit_creds
);
492 * abort_creds - Discard a set of credentials and unlock the current task
493 * @new: The credentials that were going to be applied
495 * Discard a set of credentials that were under construction and unlock the
498 void abort_creds(struct cred
*new)
500 kdebug("abort_creds(%p{%d,%d})", new,
501 atomic_read(&new->usage
),
502 read_cred_subscribers(new));
504 #ifdef CONFIG_DEBUG_CREDENTIALS
505 BUG_ON(read_cred_subscribers(new) != 0);
507 BUG_ON(atomic_read(&new->usage
) < 1);
510 EXPORT_SYMBOL(abort_creds
);
513 * override_creds - Override the current process's subjective credentials
514 * @new: The credentials to be assigned
516 * Install a set of temporary override subjective credentials on the current
517 * process, returning the old set for later reversion.
519 const struct cred
*override_creds(const struct cred
*new)
521 const struct cred
*old
= current
->cred
;
523 kdebug("override_creds(%p{%d,%d})", new,
524 atomic_read(&new->usage
),
525 read_cred_subscribers(new));
530 alter_cred_subscribers(new, 1);
531 rcu_assign_pointer(current
->cred
, new);
532 alter_cred_subscribers(old
, -1);
534 kdebug("override_creds() = %p{%d,%d}", old
,
535 atomic_read(&old
->usage
),
536 read_cred_subscribers(old
));
539 EXPORT_SYMBOL(override_creds
);
542 * revert_creds - Revert a temporary subjective credentials override
543 * @old: The credentials to be restored
545 * Revert a temporary set of override subjective credentials to an old set,
546 * discarding the override set.
548 void revert_creds(const struct cred
*old
)
550 const struct cred
*override
= current
->cred
;
552 kdebug("revert_creds(%p{%d,%d})", old
,
553 atomic_read(&old
->usage
),
554 read_cred_subscribers(old
));
557 validate_creds(override
);
558 alter_cred_subscribers(old
, 1);
559 rcu_assign_pointer(current
->cred
, old
);
560 alter_cred_subscribers(override
, -1);
563 EXPORT_SYMBOL(revert_creds
);
566 * cred_fscmp - Compare two credentials with respect to filesystem access.
567 * @a: The first credential
568 * @b: The second credential
570 * cred_cmp() will return zero if both credentials have the same
571 * fsuid, fsgid, and supplementary groups. That is, if they will both
572 * provide the same access to files based on mode/uid/gid.
573 * If the credentials are different, then either -1 or 1 will
574 * be returned depending on whether @a comes before or after @b
575 * respectively in an arbitrary, but stable, ordering of credentials.
577 * Return: -1, 0, or 1 depending on comparison
579 int cred_fscmp(const struct cred
*a
, const struct cred
*b
)
581 struct group_info
*ga
, *gb
;
586 if (uid_lt(a
->fsuid
, b
->fsuid
))
588 if (uid_gt(a
->fsuid
, b
->fsuid
))
591 if (gid_lt(a
->fsgid
, b
->fsgid
))
593 if (gid_gt(a
->fsgid
, b
->fsgid
))
604 if (ga
->ngroups
< gb
->ngroups
)
606 if (ga
->ngroups
> gb
->ngroups
)
609 for (g
= 0; g
< ga
->ngroups
; g
++) {
610 if (gid_lt(ga
->gid
[g
], gb
->gid
[g
]))
612 if (gid_gt(ga
->gid
[g
], gb
->gid
[g
]))
617 EXPORT_SYMBOL(cred_fscmp
);
620 * initialise the credentials stuff
622 void __init
cred_init(void)
624 /* allocate a slab in which we can store credentials */
625 cred_jar
= kmem_cache_create("cred_jar", sizeof(struct cred
), 0,
626 SLAB_HWCACHE_ALIGN
|SLAB_PANIC
|SLAB_ACCOUNT
, NULL
);
630 * prepare_kernel_cred - Prepare a set of credentials for a kernel service
631 * @daemon: A userspace daemon to be used as a reference
633 * Prepare a set of credentials for a kernel service. This can then be used to
634 * override a task's own credentials so that work can be done on behalf of that
635 * task that requires a different subjective context.
637 * @daemon is used to provide a base for the security record, but can be NULL.
638 * If @daemon is supplied, then the security data will be derived from that;
639 * otherwise they'll be set to 0 and no groups, full capabilities and no keys.
641 * The caller may change these controls afterwards if desired.
643 * Returns the new credentials or NULL if out of memory.
645 * Does not take, and does not return holding current->cred_replace_mutex.
647 struct cred
*prepare_kernel_cred(struct task_struct
*daemon
)
649 const struct cred
*old
;
652 new = kmem_cache_alloc(cred_jar
, GFP_KERNEL
);
656 kdebug("prepare_kernel_cred() alloc %p", new);
659 old
= get_task_cred(daemon
);
661 old
= get_cred(&init_cred
);
666 atomic_set(&new->usage
, 1);
667 set_cred_subscribers(new, 0);
669 get_user_ns(new->user_ns
);
670 get_group_info(new->group_info
);
673 new->session_keyring
= NULL
;
674 new->process_keyring
= NULL
;
675 new->thread_keyring
= NULL
;
676 new->request_key_auth
= NULL
;
677 new->jit_keyring
= KEY_REQKEY_DEFL_THREAD_KEYRING
;
680 #ifdef CONFIG_SECURITY
681 new->security
= NULL
;
683 if (security_prepare_creds(new, old
, GFP_KERNEL
) < 0)
695 EXPORT_SYMBOL(prepare_kernel_cred
);
698 * set_security_override - Set the security ID in a set of credentials
699 * @new: The credentials to alter
700 * @secid: The LSM security ID to set
702 * Set the LSM security ID in a set of credentials so that the subjective
703 * security is overridden when an alternative set of credentials is used.
705 int set_security_override(struct cred
*new, u32 secid
)
707 return security_kernel_act_as(new, secid
);
709 EXPORT_SYMBOL(set_security_override
);
712 * set_security_override_from_ctx - Set the security ID in a set of credentials
713 * @new: The credentials to alter
714 * @secctx: The LSM security context to generate the security ID from.
716 * Set the LSM security ID in a set of credentials so that the subjective
717 * security is overridden when an alternative set of credentials is used. The
718 * security ID is specified in string form as a security context to be
719 * interpreted by the LSM.
721 int set_security_override_from_ctx(struct cred
*new, const char *secctx
)
726 ret
= security_secctx_to_secid(secctx
, strlen(secctx
), &secid
);
730 return set_security_override(new, secid
);
732 EXPORT_SYMBOL(set_security_override_from_ctx
);
735 * set_create_files_as - Set the LSM file create context in a set of credentials
736 * @new: The credentials to alter
737 * @inode: The inode to take the context from
739 * Change the LSM file creation context in a set of credentials to be the same
740 * as the object context of the specified inode, so that the new inodes have
741 * the same MAC context as that inode.
743 int set_create_files_as(struct cred
*new, struct inode
*inode
)
745 if (!uid_valid(inode
->i_uid
) || !gid_valid(inode
->i_gid
))
747 new->fsuid
= inode
->i_uid
;
748 new->fsgid
= inode
->i_gid
;
749 return security_kernel_create_files_as(new, inode
);
751 EXPORT_SYMBOL(set_create_files_as
);
753 #ifdef CONFIG_DEBUG_CREDENTIALS
755 bool creds_are_invalid(const struct cred
*cred
)
757 if (cred
->magic
!= CRED_MAGIC
)
761 EXPORT_SYMBOL(creds_are_invalid
);
764 * dump invalid credentials
766 static void dump_invalid_creds(const struct cred
*cred
, const char *label
,
767 const struct task_struct
*tsk
)
769 printk(KERN_ERR
"CRED: %s credentials: %p %s%s%s\n",
771 cred
== &init_cred
? "[init]" : "",
772 cred
== tsk
->real_cred
? "[real]" : "",
773 cred
== tsk
->cred
? "[eff]" : "");
774 printk(KERN_ERR
"CRED: ->magic=%x, put_addr=%p\n",
775 cred
->magic
, cred
->put_addr
);
776 printk(KERN_ERR
"CRED: ->usage=%d, subscr=%d\n",
777 atomic_read(&cred
->usage
),
778 read_cred_subscribers(cred
));
779 printk(KERN_ERR
"CRED: ->*uid = { %d,%d,%d,%d }\n",
780 from_kuid_munged(&init_user_ns
, cred
->uid
),
781 from_kuid_munged(&init_user_ns
, cred
->euid
),
782 from_kuid_munged(&init_user_ns
, cred
->suid
),
783 from_kuid_munged(&init_user_ns
, cred
->fsuid
));
784 printk(KERN_ERR
"CRED: ->*gid = { %d,%d,%d,%d }\n",
785 from_kgid_munged(&init_user_ns
, cred
->gid
),
786 from_kgid_munged(&init_user_ns
, cred
->egid
),
787 from_kgid_munged(&init_user_ns
, cred
->sgid
),
788 from_kgid_munged(&init_user_ns
, cred
->fsgid
));
789 #ifdef CONFIG_SECURITY
790 printk(KERN_ERR
"CRED: ->security is %p\n", cred
->security
);
791 if ((unsigned long) cred
->security
>= PAGE_SIZE
&&
792 (((unsigned long) cred
->security
& 0xffffff00) !=
793 (POISON_FREE
<< 24 | POISON_FREE
<< 16 | POISON_FREE
<< 8)))
794 printk(KERN_ERR
"CRED: ->security {%x, %x}\n",
795 ((u32
*)cred
->security
)[0],
796 ((u32
*)cred
->security
)[1]);
801 * report use of invalid credentials
803 void __invalid_creds(const struct cred
*cred
, const char *file
, unsigned line
)
805 printk(KERN_ERR
"CRED: Invalid credentials\n");
806 printk(KERN_ERR
"CRED: At %s:%u\n", file
, line
);
807 dump_invalid_creds(cred
, "Specified", current
);
810 EXPORT_SYMBOL(__invalid_creds
);
813 * check the credentials on a process
815 void __validate_process_creds(struct task_struct
*tsk
,
816 const char *file
, unsigned line
)
818 if (tsk
->cred
== tsk
->real_cred
) {
819 if (unlikely(read_cred_subscribers(tsk
->cred
) < 2 ||
820 creds_are_invalid(tsk
->cred
)))
823 if (unlikely(read_cred_subscribers(tsk
->real_cred
) < 1 ||
824 read_cred_subscribers(tsk
->cred
) < 1 ||
825 creds_are_invalid(tsk
->real_cred
) ||
826 creds_are_invalid(tsk
->cred
)))
832 printk(KERN_ERR
"CRED: Invalid process credentials\n");
833 printk(KERN_ERR
"CRED: At %s:%u\n", file
, line
);
835 dump_invalid_creds(tsk
->real_cred
, "Real", tsk
);
836 if (tsk
->cred
!= tsk
->real_cred
)
837 dump_invalid_creds(tsk
->cred
, "Effective", tsk
);
839 printk(KERN_ERR
"CRED: Effective creds == Real creds\n");
842 EXPORT_SYMBOL(__validate_process_creds
);
845 * check creds for do_exit()
847 void validate_creds_for_do_exit(struct task_struct
*tsk
)
849 kdebug("validate_creds_for_do_exit(%p,%p{%d,%d})",
850 tsk
->real_cred
, tsk
->cred
,
851 atomic_read(&tsk
->cred
->usage
),
852 read_cred_subscribers(tsk
->cred
));
854 __validate_process_creds(tsk
, __FILE__
, __LINE__
);
857 #endif /* CONFIG_DEBUG_CREDENTIALS */