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| author | David Howells <dhowells@redhat.com> | 2008-11-14 10:39:19 +1100 |
|---|---|---|
| committer | James Morris <jmorris@namei.org> | 2008-11-14 10:39:19 +1100 |
| commit | c69e8d9c01db2adc503464993c358901c9af9de4 (patch) | |
| tree | bed94aaa9aeb7a7834d1c880f72b62a11a752c78 /include/linux/cred.h | |
| parent | 86a264abe542cfececb4df129bc45a0338d8cdb9 (diff) | |
| download | lwn-c69e8d9c01db2adc503464993c358901c9af9de4.tar.gz lwn-c69e8d9c01db2adc503464993c358901c9af9de4.zip | |
CRED: Use RCU to access another task's creds and to release a task's own creds
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>
Diffstat (limited to 'include/linux/cred.h')
| -rw-r--r-- | include/linux/cred.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/cred.h b/include/linux/cred.h index 4221ec6000c1..166ce4ddba64 100644 --- a/include/linux/cred.h +++ b/include/linux/cred.h @@ -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); } |