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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 | |
| parent | 460fbf82c0842cad3f3c744c4dcb81978b7829f3 (diff) | |
| download | kernel_samsung_smdk4412-c3a9d6541f84ac3ff566982d08389b87c1c36b4e.tar.gz kernel_samsung_smdk4412-c3a9d6541f84ac3ff566982d08389b87c1c36b4e.tar.bz2 kernel_samsung_smdk4412-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>
| -rw-r--r-- | security/keys/key.c | 4 | ||||
| -rw-r--r-- | security/keys/keyring.c | 1 |
2 files changed, 5 insertions, 0 deletions
diff --git a/security/keys/key.c b/security/keys/key.c index a057e3311aa..b6061fa29da 100644 --- a/security/keys/key.c +++ b/security/keys/key.c @@ -785,6 +785,10 @@ key_ref_t key_create_or_update(key_ref_t keyring_ref, key_check(keyring); + key_ref = ERR_PTR(-ENOTDIR); + if (keyring->type != &key_type_keyring) + goto error_2; + down_write(&keyring->sem); /* if we're going to allocate a new key, we're going to have diff --git a/security/keys/keyring.c b/security/keys/keyring.c index d65a180f888..bffa924c1f8 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, |