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CRED: Fix BUG() upon security_cred_alloc_blank() failure

Browse source 
In cred_alloc_blank() since 2.6.32, abort_creds(new) is called with
new->security == NULL and new->magic == 0 when security_cred_alloc_blank()
returns an error.  As a result, BUG() will be triggered if SELinux is enabled
or CONFIG_DEBUG_CREDENTIALS=y.

If CONFIG_DEBUG_CREDENTIALS=y, BUG() is called from __invalid_creds() because
cred->magic == 0.  Failing that, BUG() is called from selinux_cred_free()
because selinux_cred_free() is not expecting cred->security == NULL.  This does
not affect smack_cred_free(), tomoyo_cred_free() or apparmor_cred_free().

Fix these bugs by

(1) Set new->magic before calling security_cred_alloc_blank().

(2) Handle null cred->security in creds_are_invalid() and selinux_cred_free().

Signed-off-by: Tetsuo Handa <[email protected]>
Signed-off-by: David Howells <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Tetsuo Handa 2011-02-07 13:36:10 +00:00 • committed by Linus Torvalds
commit 2edeaa34a6
2 changed files with 13 additions and 5 deletions
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6
security/selinux/hooks.c
View file

@ -3198,7 +3198,11 @@ static void selinux_cred_free(struct cred *cred)
{
struct task_security_struct *tsec = cred->security;
BUG_ON((unsigned long) cred->security < PAGE_SIZE);
/*
* cred->security == NULL if security_cred_alloc_blank() or
* security_prepare_creds() returned an error.
*/
BUG_ON(cred->security && (unsigned long) cred->security < PAGE_SIZE);
cred->security = (void *) 0x7UL;
kfree(tsec);
}