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authorDavid Howells <dhowells@redhat.com>2006-04-10 17:01:40 +0000
committerGreg Kroah-Hartman <gregkh@suse.de>2006-04-10 21:48:21 -0700
commit5494bd6a500cc7c5a502279eabfbdacccd4b89d1 (patch)
treea1013355c5ff3d8b02245e3a91c52ac5e3b52c40 /security
parentdbb676d1214c181e6cde4ce67b7bf012d071f1ed (diff)
downloadlinux-linaro-stable-5494bd6a500cc7c5a502279eabfbdacccd4b89d1.tar.gz
[PATCH] Keys: Fix oops when adding key to non-keyring [CVE-2006-1522]
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> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'security')
-rw-r--r--security/keys/key.c4
-rw-r--r--security/keys/keyring.c1
2 files changed, 5 insertions, 0 deletions
diff --git a/security/keys/key.c b/security/keys/key.c
index 99781b798312..0e2584e11308 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 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,