1 /* Task credentials management - see Documentation/security/credentials.rst
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/export.h>
12 #include <linux/cred.h>
13 #include <linux/slab.h>
14 #include <linux/sched.h>
15 #include <linux/sched/coredump.h>
16 #include <linux/key.h>
17 #include <linux/keyctl.h>
18 #include <linux/init_task.h>
19 #include <linux/security.h>
20 #include <linux/binfmts.h>
21 #include <linux/cn_proc.h>
22 #include <linux/uidgid.h>
25 #define kdebug(FMT, ...) \
26 printk("[%-5.5s%5u] " FMT "\n", \
27 current->comm, current->pid, ##__VA_ARGS__)
29 #define kdebug(FMT, ...) \
32 no_printk("[%-5.5s%5u] " FMT "\n", \
33 current->comm, current->pid, ##__VA_ARGS__); \
37 static struct kmem_cache
*cred_jar
;
39 /* init to 2 - one for init_task, one to ensure it is never freed */
40 struct group_info init_groups
= { .usage
= ATOMIC_INIT(2) };
43 * The initial credentials for the initial task
45 struct cred init_cred
= {
46 .usage
= ATOMIC_INIT(4),
47 #ifdef CONFIG_DEBUG_CREDENTIALS
48 .subscribers
= ATOMIC_INIT(2),
51 .uid
= GLOBAL_ROOT_UID
,
52 .gid
= GLOBAL_ROOT_GID
,
53 .suid
= GLOBAL_ROOT_UID
,
54 .sgid
= GLOBAL_ROOT_GID
,
55 .euid
= GLOBAL_ROOT_UID
,
56 .egid
= GLOBAL_ROOT_GID
,
57 .fsuid
= GLOBAL_ROOT_UID
,
58 .fsgid
= GLOBAL_ROOT_GID
,
59 .securebits
= SECUREBITS_DEFAULT
,
60 .cap_inheritable
= CAP_EMPTY_SET
,
61 .cap_permitted
= CAP_FULL_SET
,
62 .cap_effective
= CAP_FULL_SET
,
63 .cap_bset
= CAP_FULL_SET
,
65 .user_ns
= &init_user_ns
,
66 .group_info
= &init_groups
,
69 static inline void set_cred_subscribers(struct cred
*cred
, int n
)
71 #ifdef CONFIG_DEBUG_CREDENTIALS
72 atomic_set(&cred
->subscribers
, n
);
76 static inline int read_cred_subscribers(const struct cred
*cred
)
78 #ifdef CONFIG_DEBUG_CREDENTIALS
79 return atomic_read(&cred
->subscribers
);
85 static inline void alter_cred_subscribers(const struct cred
*_cred
, int n
)
87 #ifdef CONFIG_DEBUG_CREDENTIALS
88 struct cred
*cred
= (struct cred
*) _cred
;
90 atomic_add(n
, &cred
->subscribers
);
95 * The RCU callback to actually dispose of a set of credentials
97 static void put_cred_rcu(struct rcu_head
*rcu
)
99 struct cred
*cred
= container_of(rcu
, struct cred
, rcu
);
101 kdebug("put_cred_rcu(%p)", cred
);
103 #ifdef CONFIG_DEBUG_CREDENTIALS
104 if (cred
->magic
!= CRED_MAGIC_DEAD
||
105 atomic_read(&cred
->usage
) != 0 ||
106 read_cred_subscribers(cred
) != 0)
107 panic("CRED: put_cred_rcu() sees %p with"
108 " mag %x, put %p, usage %d, subscr %d\n",
109 cred
, cred
->magic
, cred
->put_addr
,
110 atomic_read(&cred
->usage
),
111 read_cred_subscribers(cred
));
113 if (atomic_read(&cred
->usage
) != 0)
114 panic("CRED: put_cred_rcu() sees %p with usage %d\n",
115 cred
, atomic_read(&cred
->usage
));
118 security_cred_free(cred
);
119 key_put(cred
->session_keyring
);
120 key_put(cred
->process_keyring
);
121 key_put(cred
->thread_keyring
);
122 key_put(cred
->request_key_auth
);
123 if (cred
->group_info
)
124 put_group_info(cred
->group_info
);
125 free_uid(cred
->user
);
126 put_user_ns(cred
->user_ns
);
127 kmem_cache_free(cred_jar
, cred
);
131 * __put_cred - Destroy a set of credentials
132 * @cred: The record to release
134 * Destroy a set of credentials on which no references remain.
136 void __put_cred(struct cred
*cred
)
138 kdebug("__put_cred(%p{%d,%d})", cred
,
139 atomic_read(&cred
->usage
),
140 read_cred_subscribers(cred
));
142 BUG_ON(atomic_read(&cred
->usage
) != 0);
143 #ifdef CONFIG_DEBUG_CREDENTIALS
144 BUG_ON(read_cred_subscribers(cred
) != 0);
145 cred
->magic
= CRED_MAGIC_DEAD
;
146 cred
->put_addr
= __builtin_return_address(0);
148 BUG_ON(cred
== current
->cred
);
149 BUG_ON(cred
== current
->real_cred
);
151 call_rcu(&cred
->rcu
, put_cred_rcu
);
153 EXPORT_SYMBOL(__put_cred
);
156 * Clean up a task's credentials when it exits
158 void exit_creds(struct task_struct
*tsk
)
162 kdebug("exit_creds(%u,%p,%p,{%d,%d})", tsk
->pid
, tsk
->real_cred
, tsk
->cred
,
163 atomic_read(&tsk
->cred
->usage
),
164 read_cred_subscribers(tsk
->cred
));
166 cred
= (struct cred
*) tsk
->real_cred
;
167 tsk
->real_cred
= NULL
;
168 validate_creds(cred
);
169 alter_cred_subscribers(cred
, -1);
172 cred
= (struct cred
*) tsk
->cred
;
174 validate_creds(cred
);
175 alter_cred_subscribers(cred
, -1);
180 * get_task_cred - Get another task's objective credentials
181 * @task: The task to query
183 * Get the objective credentials of a task, pinning them so that they can't go
184 * away. Accessing a task's credentials directly is not permitted.
186 * The caller must also make sure task doesn't get deleted, either by holding a
187 * ref on task or by holding tasklist_lock to prevent it from being unlinked.
189 const struct cred
*get_task_cred(struct task_struct
*task
)
191 const struct cred
*cred
;
196 cred
= __task_cred((task
));
198 } while (!get_cred_rcu(cred
));
203 EXPORT_SYMBOL(get_task_cred
);
206 * Allocate blank credentials, such that the credentials can be filled in at a
207 * later date without risk of ENOMEM.
209 struct cred
*cred_alloc_blank(void)
213 new = kmem_cache_zalloc(cred_jar
, GFP_KERNEL
);
217 atomic_set(&new->usage
, 1);
218 #ifdef CONFIG_DEBUG_CREDENTIALS
219 new->magic
= CRED_MAGIC
;
222 if (security_cred_alloc_blank(new, GFP_KERNEL
) < 0)
233 * prepare_creds - Prepare a new set of credentials for modification
235 * Prepare a new set of task credentials for modification. A task's creds
236 * shouldn't generally be modified directly, therefore this function is used to
237 * prepare a new copy, which the caller then modifies and then commits by
238 * calling commit_creds().
240 * Preparation involves making a copy of the objective creds for modification.
242 * Returns a pointer to the new creds-to-be if successful, NULL otherwise.
244 * Call commit_creds() or abort_creds() to clean up.
246 struct cred
*prepare_creds(void)
248 struct task_struct
*task
= current
;
249 const struct cred
*old
;
252 validate_process_creds();
254 new = kmem_cache_alloc(cred_jar
, GFP_KERNEL
);
258 kdebug("prepare_creds() alloc %p", new);
261 memcpy(new, old
, sizeof(struct cred
));
263 atomic_set(&new->usage
, 1);
264 set_cred_subscribers(new, 0);
265 get_group_info(new->group_info
);
267 get_user_ns(new->user_ns
);
270 key_get(new->session_keyring
);
271 key_get(new->process_keyring
);
272 key_get(new->thread_keyring
);
273 key_get(new->request_key_auth
);
276 #ifdef CONFIG_SECURITY
277 new->security
= NULL
;
280 if (security_prepare_creds(new, old
, GFP_KERNEL
) < 0)
289 EXPORT_SYMBOL(prepare_creds
);
292 * Prepare credentials for current to perform an execve()
293 * - The caller must hold ->cred_guard_mutex
295 struct cred
*prepare_exec_creds(void)
299 new = prepare_creds();
304 /* newly exec'd tasks don't get a thread keyring */
305 key_put(new->thread_keyring
);
306 new->thread_keyring
= NULL
;
308 /* inherit the session keyring; new process keyring */
309 key_put(new->process_keyring
);
310 new->process_keyring
= NULL
;
317 * Copy credentials for the new process created by fork()
319 * We share if we can, but under some circumstances we have to generate a new
322 * The new process gets the current process's subjective credentials as its
323 * objective and subjective credentials
325 int copy_creds(struct task_struct
*p
, unsigned long clone_flags
)
332 !p
->cred
->thread_keyring
&&
334 clone_flags
& CLONE_THREAD
336 p
->real_cred
= get_cred(p
->cred
);
338 alter_cred_subscribers(p
->cred
, 2);
339 kdebug("share_creds(%p{%d,%d})",
340 p
->cred
, atomic_read(&p
->cred
->usage
),
341 read_cred_subscribers(p
->cred
));
342 atomic_inc(&p
->cred
->user
->processes
);
346 new = prepare_creds();
350 if (clone_flags
& CLONE_NEWUSER
) {
351 ret
= create_user_ns(new);
357 /* new threads get their own thread keyrings if their parent already
359 if (new->thread_keyring
) {
360 key_put(new->thread_keyring
);
361 new->thread_keyring
= NULL
;
362 if (clone_flags
& CLONE_THREAD
)
363 install_thread_keyring_to_cred(new);
366 /* The process keyring is only shared between the threads in a process;
367 * anything outside of those threads doesn't inherit.
369 if (!(clone_flags
& CLONE_THREAD
)) {
370 key_put(new->process_keyring
);
371 new->process_keyring
= NULL
;
375 atomic_inc(&new->user
->processes
);
376 p
->cred
= p
->real_cred
= get_cred(new);
377 alter_cred_subscribers(new, 2);
386 static bool cred_cap_issubset(const struct cred
*set
, const struct cred
*subset
)
388 const struct user_namespace
*set_ns
= set
->user_ns
;
389 const struct user_namespace
*subset_ns
= subset
->user_ns
;
391 /* If the two credentials are in the same user namespace see if
392 * the capabilities of subset are a subset of set.
394 if (set_ns
== subset_ns
)
395 return cap_issubset(subset
->cap_permitted
, set
->cap_permitted
);
397 /* The credentials are in a different user namespaces
398 * therefore one is a subset of the other only if a set is an
399 * ancestor of subset and set->euid is owner of subset or one
400 * of subsets ancestors.
402 for (;subset_ns
!= &init_user_ns
; subset_ns
= subset_ns
->parent
) {
403 if ((set_ns
== subset_ns
->parent
) &&
404 uid_eq(subset_ns
->owner
, set
->euid
))
412 * commit_creds - Install new credentials upon the current task
413 * @new: The credentials to be assigned
415 * Install a new set of credentials to the current task, using RCU to replace
416 * the old set. Both the objective and the subjective credentials pointers are
417 * updated. This function may not be called if the subjective credentials are
418 * in an overridden state.
420 * This function eats the caller's reference to the new credentials.
422 * Always returns 0 thus allowing this function to be tail-called at the end
423 * of, say, sys_setgid().
425 int commit_creds(struct cred
*new)
427 struct task_struct
*task
= current
;
428 const struct cred
*old
= task
->real_cred
;
430 kdebug("commit_creds(%p{%d,%d})", new,
431 atomic_read(&new->usage
),
432 read_cred_subscribers(new));
434 BUG_ON(task
->cred
!= old
);
435 #ifdef CONFIG_DEBUG_CREDENTIALS
436 BUG_ON(read_cred_subscribers(old
) < 2);
440 BUG_ON(atomic_read(&new->usage
) < 1);
442 get_cred(new); /* we will require a ref for the subj creds too */
444 /* dumpability changes */
445 if (!uid_eq(old
->euid
, new->euid
) ||
446 !gid_eq(old
->egid
, new->egid
) ||
447 !uid_eq(old
->fsuid
, new->fsuid
) ||
448 !gid_eq(old
->fsgid
, new->fsgid
) ||
449 !cred_cap_issubset(old
, new)) {
451 set_dumpable(task
->mm
, suid_dumpable
);
452 task
->pdeath_signal
= 0;
454 * If a task drops privileges and becomes nondumpable,
455 * the dumpability change must become visible before
456 * the credential change; otherwise, a __ptrace_may_access()
457 * racing with this change may be able to attach to a task it
458 * shouldn't be able to attach to (as if the task had dropped
459 * privileges without becoming nondumpable).
460 * Pairs with a read barrier in __ptrace_may_access().
465 /* alter the thread keyring */
466 if (!uid_eq(new->fsuid
, old
->fsuid
))
467 key_fsuid_changed(task
);
468 if (!gid_eq(new->fsgid
, old
->fsgid
))
469 key_fsgid_changed(task
);
472 * RLIMIT_NPROC limits on user->processes have already been checked
475 alter_cred_subscribers(new, 2);
476 if (new->user
!= old
->user
)
477 atomic_inc(&new->user
->processes
);
478 rcu_assign_pointer(task
->real_cred
, new);
479 rcu_assign_pointer(task
->cred
, new);
480 if (new->user
!= old
->user
)
481 atomic_dec(&old
->user
->processes
);
482 alter_cred_subscribers(old
, -2);
484 /* send notifications */
485 if (!uid_eq(new->uid
, old
->uid
) ||
486 !uid_eq(new->euid
, old
->euid
) ||
487 !uid_eq(new->suid
, old
->suid
) ||
488 !uid_eq(new->fsuid
, old
->fsuid
))
489 proc_id_connector(task
, PROC_EVENT_UID
);
491 if (!gid_eq(new->gid
, old
->gid
) ||
492 !gid_eq(new->egid
, old
->egid
) ||
493 !gid_eq(new->sgid
, old
->sgid
) ||
494 !gid_eq(new->fsgid
, old
->fsgid
))
495 proc_id_connector(task
, PROC_EVENT_GID
);
497 /* release the old obj and subj refs both */
502 EXPORT_SYMBOL(commit_creds
);
505 * abort_creds - Discard a set of credentials and unlock the current task
506 * @new: The credentials that were going to be applied
508 * Discard a set of credentials that were under construction and unlock the
511 void abort_creds(struct cred
*new)
513 kdebug("abort_creds(%p{%d,%d})", new,
514 atomic_read(&new->usage
),
515 read_cred_subscribers(new));
517 #ifdef CONFIG_DEBUG_CREDENTIALS
518 BUG_ON(read_cred_subscribers(new) != 0);
520 BUG_ON(atomic_read(&new->usage
) < 1);
523 EXPORT_SYMBOL(abort_creds
);
526 * override_creds - Override the current process's subjective credentials
527 * @new: The credentials to be assigned
529 * Install a set of temporary override subjective credentials on the current
530 * process, returning the old set for later reversion.
532 const struct cred
*override_creds(const struct cred
*new)
534 const struct cred
*old
= current
->cred
;
536 kdebug("override_creds(%p{%d,%d})", new,
537 atomic_read(&new->usage
),
538 read_cred_subscribers(new));
543 alter_cred_subscribers(new, 1);
544 rcu_assign_pointer(current
->cred
, new);
545 alter_cred_subscribers(old
, -1);
547 kdebug("override_creds() = %p{%d,%d}", old
,
548 atomic_read(&old
->usage
),
549 read_cred_subscribers(old
));
552 EXPORT_SYMBOL(override_creds
);
555 * revert_creds - Revert a temporary subjective credentials override
556 * @old: The credentials to be restored
558 * Revert a temporary set of override subjective credentials to an old set,
559 * discarding the override set.
561 void revert_creds(const struct cred
*old
)
563 const struct cred
*override
= current
->cred
;
565 kdebug("revert_creds(%p{%d,%d})", old
,
566 atomic_read(&old
->usage
),
567 read_cred_subscribers(old
));
570 validate_creds(override
);
571 alter_cred_subscribers(old
, 1);
572 rcu_assign_pointer(current
->cred
, old
);
573 alter_cred_subscribers(override
, -1);
576 EXPORT_SYMBOL(revert_creds
);
579 * cred_fscmp - Compare two credentials with respect to filesystem access.
580 * @a: The first credential
581 * @b: The second credential
583 * cred_cmp() will return zero if both credentials have the same
584 * fsuid, fsgid, and supplementary groups. That is, if they will both
585 * provide the same access to files based on mode/uid/gid.
586 * If the credentials are different, then either -1 or 1 will
587 * be returned depending on whether @a comes before or after @b
588 * respectively in an arbitrary, but stable, ordering of credentials.
590 * Return: -1, 0, or 1 depending on comparison
592 int cred_fscmp(const struct cred
*a
, const struct cred
*b
)
594 struct group_info
*ga
, *gb
;
599 if (uid_lt(a
->fsuid
, b
->fsuid
))
601 if (uid_gt(a
->fsuid
, b
->fsuid
))
604 if (gid_lt(a
->fsgid
, b
->fsgid
))
606 if (gid_gt(a
->fsgid
, b
->fsgid
))
617 if (ga
->ngroups
< gb
->ngroups
)
619 if (ga
->ngroups
> gb
->ngroups
)
622 for (g
= 0; g
< ga
->ngroups
; g
++) {
623 if (gid_lt(ga
->gid
[g
], gb
->gid
[g
]))
625 if (gid_gt(ga
->gid
[g
], gb
->gid
[g
]))
630 EXPORT_SYMBOL(cred_fscmp
);
633 * initialise the credentials stuff
635 void __init
cred_init(void)
637 /* allocate a slab in which we can store credentials */
638 cred_jar
= kmem_cache_create("cred_jar", sizeof(struct cred
), 0,
639 SLAB_HWCACHE_ALIGN
|SLAB_PANIC
|SLAB_ACCOUNT
, NULL
);
643 * prepare_kernel_cred - Prepare a set of credentials for a kernel service
644 * @daemon: A userspace daemon to be used as a reference
646 * Prepare a set of credentials for a kernel service. This can then be used to
647 * override a task's own credentials so that work can be done on behalf of that
648 * task that requires a different subjective context.
650 * @daemon is used to provide a base for the security record, but can be NULL.
651 * If @daemon is supplied, then the security data will be derived from that;
652 * otherwise they'll be set to 0 and no groups, full capabilities and no keys.
654 * The caller may change these controls afterwards if desired.
656 * Returns the new credentials or NULL if out of memory.
658 * Does not take, and does not return holding current->cred_replace_mutex.
660 struct cred
*prepare_kernel_cred(struct task_struct
*daemon
)
662 const struct cred
*old
;
665 new = kmem_cache_alloc(cred_jar
, GFP_KERNEL
);
669 kdebug("prepare_kernel_cred() alloc %p", new);
672 old
= get_task_cred(daemon
);
674 old
= get_cred(&init_cred
);
679 atomic_set(&new->usage
, 1);
680 set_cred_subscribers(new, 0);
682 get_user_ns(new->user_ns
);
683 get_group_info(new->group_info
);
686 new->session_keyring
= NULL
;
687 new->process_keyring
= NULL
;
688 new->thread_keyring
= NULL
;
689 new->request_key_auth
= NULL
;
690 new->jit_keyring
= KEY_REQKEY_DEFL_THREAD_KEYRING
;
693 #ifdef CONFIG_SECURITY
694 new->security
= NULL
;
696 if (security_prepare_creds(new, old
, GFP_KERNEL
) < 0)
708 EXPORT_SYMBOL(prepare_kernel_cred
);
711 * set_security_override - Set the security ID in a set of credentials
712 * @new: The credentials to alter
713 * @secid: The LSM security ID to set
715 * Set the LSM security ID in a set of credentials so that the subjective
716 * security is overridden when an alternative set of credentials is used.
718 int set_security_override(struct cred
*new, u32 secid
)
720 return security_kernel_act_as(new, secid
);
722 EXPORT_SYMBOL(set_security_override
);
725 * set_security_override_from_ctx - Set the security ID in a set of credentials
726 * @new: The credentials to alter
727 * @secctx: The LSM security context to generate the security ID from.
729 * Set the LSM security ID in a set of credentials so that the subjective
730 * security is overridden when an alternative set of credentials is used. The
731 * security ID is specified in string form as a security context to be
732 * interpreted by the LSM.
734 int set_security_override_from_ctx(struct cred
*new, const char *secctx
)
739 ret
= security_secctx_to_secid(secctx
, strlen(secctx
), &secid
);
743 return set_security_override(new, secid
);
745 EXPORT_SYMBOL(set_security_override_from_ctx
);
748 * set_create_files_as - Set the LSM file create context in a set of credentials
749 * @new: The credentials to alter
750 * @inode: The inode to take the context from
752 * Change the LSM file creation context in a set of credentials to be the same
753 * as the object context of the specified inode, so that the new inodes have
754 * the same MAC context as that inode.
756 int set_create_files_as(struct cred
*new, struct inode
*inode
)
758 if (!uid_valid(inode
->i_uid
) || !gid_valid(inode
->i_gid
))
760 new->fsuid
= inode
->i_uid
;
761 new->fsgid
= inode
->i_gid
;
762 return security_kernel_create_files_as(new, inode
);
764 EXPORT_SYMBOL(set_create_files_as
);
766 #ifdef CONFIG_DEBUG_CREDENTIALS
768 bool creds_are_invalid(const struct cred
*cred
)
770 if (cred
->magic
!= CRED_MAGIC
)
774 EXPORT_SYMBOL(creds_are_invalid
);
777 * dump invalid credentials
779 static void dump_invalid_creds(const struct cred
*cred
, const char *label
,
780 const struct task_struct
*tsk
)
782 printk(KERN_ERR
"CRED: %s credentials: %p %s%s%s\n",
784 cred
== &init_cred
? "[init]" : "",
785 cred
== tsk
->real_cred
? "[real]" : "",
786 cred
== tsk
->cred
? "[eff]" : "");
787 printk(KERN_ERR
"CRED: ->magic=%x, put_addr=%p\n",
788 cred
->magic
, cred
->put_addr
);
789 printk(KERN_ERR
"CRED: ->usage=%d, subscr=%d\n",
790 atomic_read(&cred
->usage
),
791 read_cred_subscribers(cred
));
792 printk(KERN_ERR
"CRED: ->*uid = { %d,%d,%d,%d }\n",
793 from_kuid_munged(&init_user_ns
, cred
->uid
),
794 from_kuid_munged(&init_user_ns
, cred
->euid
),
795 from_kuid_munged(&init_user_ns
, cred
->suid
),
796 from_kuid_munged(&init_user_ns
, cred
->fsuid
));
797 printk(KERN_ERR
"CRED: ->*gid = { %d,%d,%d,%d }\n",
798 from_kgid_munged(&init_user_ns
, cred
->gid
),
799 from_kgid_munged(&init_user_ns
, cred
->egid
),
800 from_kgid_munged(&init_user_ns
, cred
->sgid
),
801 from_kgid_munged(&init_user_ns
, cred
->fsgid
));
802 #ifdef CONFIG_SECURITY
803 printk(KERN_ERR
"CRED: ->security is %p\n", cred
->security
);
804 if ((unsigned long) cred
->security
>= PAGE_SIZE
&&
805 (((unsigned long) cred
->security
& 0xffffff00) !=
806 (POISON_FREE
<< 24 | POISON_FREE
<< 16 | POISON_FREE
<< 8)))
807 printk(KERN_ERR
"CRED: ->security {%x, %x}\n",
808 ((u32
*)cred
->security
)[0],
809 ((u32
*)cred
->security
)[1]);
814 * report use of invalid credentials
816 void __invalid_creds(const struct cred
*cred
, const char *file
, unsigned line
)
818 printk(KERN_ERR
"CRED: Invalid credentials\n");
819 printk(KERN_ERR
"CRED: At %s:%u\n", file
, line
);
820 dump_invalid_creds(cred
, "Specified", current
);
823 EXPORT_SYMBOL(__invalid_creds
);
826 * check the credentials on a process
828 void __validate_process_creds(struct task_struct
*tsk
,
829 const char *file
, unsigned line
)
831 if (tsk
->cred
== tsk
->real_cred
) {
832 if (unlikely(read_cred_subscribers(tsk
->cred
) < 2 ||
833 creds_are_invalid(tsk
->cred
)))
836 if (unlikely(read_cred_subscribers(tsk
->real_cred
) < 1 ||
837 read_cred_subscribers(tsk
->cred
) < 1 ||
838 creds_are_invalid(tsk
->real_cred
) ||
839 creds_are_invalid(tsk
->cred
)))
845 printk(KERN_ERR
"CRED: Invalid process credentials\n");
846 printk(KERN_ERR
"CRED: At %s:%u\n", file
, line
);
848 dump_invalid_creds(tsk
->real_cred
, "Real", tsk
);
849 if (tsk
->cred
!= tsk
->real_cred
)
850 dump_invalid_creds(tsk
->cred
, "Effective", tsk
);
852 printk(KERN_ERR
"CRED: Effective creds == Real creds\n");
855 EXPORT_SYMBOL(__validate_process_creds
);
858 * check creds for do_exit()
860 void validate_creds_for_do_exit(struct task_struct
*tsk
)
862 kdebug("validate_creds_for_do_exit(%p,%p{%d,%d})",
863 tsk
->real_cred
, tsk
->cred
,
864 atomic_read(&tsk
->cred
->usage
),
865 read_cred_subscribers(tsk
->cred
));
867 __validate_process_creds(tsk
, __FILE__
, __LINE__
);
870 #endif /* CONFIG_DEBUG_CREDENTIALS */