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Creds: creds->security can be NULL is selinux is disabled

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__validate_process_creds should check if selinux is actually enabled before
running tests on the selinux portion of the credentials struct.

Signed-off-by: Eric Paris <eparis@redhat.com>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
Eric Paris 2009-09-12 22:54:10 -04:00 • committed by James Morris
parent 86d710146f
commit ed868a5698
3 changed files with 23 additions and 5 deletions
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13
include/linux/cred.h
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@ -15,6 +15,7 @@
#include <linux/capability.h>
#include <linux/init.h>
#include <linux/key.h>
#include <linux/selinux.h>
#include <asm/atomic.h>
struct user_struct;
@ -182,11 +183,13 @@ static inline bool creds_are_invalid(const struct cred *cred)
if (atomic_read(&cred->usage) < atomic_read(&cred->subscribers))
return true;
#ifdef CONFIG_SECURITY_SELINUX
if ((unsigned long) cred->security < PAGE_SIZE)
return true;
if ((*(u32*)cred->security & 0xffffff00) ==
(POISON_FREE << 24 | POISON_FREE << 16 | POISON_FREE << 8))
return true;
if (selinux_is_enabled()) {
if ((unsigned long) cred->security < PAGE_SIZE)
return true;
if ((*(u32 *)cred->security & 0xffffff00) ==
(POISON_FREE << 24 | POISON_FREE << 16 | POISON_FREE << 8))
return true;
}
#endif
return false;
}