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| author |   David Howells <dhowells@redhat.com> | 2006-04-10 15:15:21 +0100 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@g5.osdl.org> | 2006-04-10 09:33:46 -0700 |
| commit | c3a9d6541f84ac3ff566982d08389b87c1c36b4e (patch) | |
| tree | 161e507b276105b35dadf0c2637be9f018b0f664 /security/keys/keyring.c | |
| parent | Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 (diff) | |
| download | linux-dev-c3a9d6541f84ac3ff566982d08389b87c1c36b4e.tar.xz linux-dev-c3a9d6541f84ac3ff566982d08389b87c1c36b4e.zip | |
[Security] Keys: Fix oops when adding key to non-keyring
This fixes the problem of an oops occuring when a user attempts to add a
key to a non-keyring key [CVE-2006-1522].
The problem is that __keyring_search_one() doesn't check that the
keyring it's been given is actually a keyring.
I've fixed this problem by:
(1) declaring that caller of __keyring_search_one() must guarantee that
the keyring is a keyring; and
(2) making key_create_or_update() check that the keyring is a keyring,
and return -ENOTDIR if it isn't.
This can be tested by:
keyctl add user b b `keyctl add user a a @s`
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'security/keys/keyring.c')
| -rw-r--r-- | security/keys/keyring.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/security/keys/keyring.c b/security/keys/keyring.c index d65a180f888d..bffa924c1f88 100644 --- a/security/keys/keyring.c +++ b/security/keys/keyring.c @@ -437,6 +437,7 @@ EXPORT_SYMBOL(keyring_search); /* * search the given keyring only (no recursion) * - keyring must be locked by caller + * - caller must guarantee that the keyring is a keyring */ key_ref_t __keyring_search_one(key_ref_t keyring_ref, const struct key_type *ktype, |