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CRED: Use RCU to access another task's creds and to release a task's own creds

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Use RCU to access another task's creds and to release a task's own creds.
This means that it will be possible for the credentials of a task to be
replaced without another task (a) requiring a full lock to read them, and (b)
seeing deallocated memory.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: James Morris <jmorris@namei.org>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
David Howells 2008-11-14 10:39:19 +11:00 • committed by James Morris
parent 86a264abe5
commit c69e8d9c01
28 changed files with 353 additions and 202 deletions
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3
include/linux/cred.h
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@ -147,8 +147,9 @@ static inline struct cred *get_cred(struct cred *cred)
* Release a reference to a set of credentials, deleting them when the last ref
* is released.
*/
static inline void put_cred(struct cred *cred)
static inline void put_cred(const struct cred *_cred)
{
struct cred *cred = (struct cred *) _cred;
if (atomic_dec_and_test(&(cred)->usage))
__put_cred(cred);
}