KEYS: encrypted: fix buffer overread in valid_master_desc()

With the 'encrypted' key type it was possible for userspace to provide a
data blob ending with a master key description shorter than expected,
e.g. 'keyctl add encrypted desc "new x" @s'.  When validating such a
master key description, validate_master_desc() could read beyond the end
of the buffer.  Fix this by using strncmp() instead of memcmp().  [Also
clean up the code to deduplicate some logic.]

Cc: Mimi Zohar <zohar@linux.vnet.ibm.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>

1 files changed, 15 insertions, 16 deletions

diff --git a/security/keys/encrypted-keys/encrypted.c b/security/keys/encrypted-keys/encrypted.c
index d14f1a47a130..0f7b95de3b5f 100644
--- a/security/keys/encrypted-keys/encrypted.c
+++ b/security/keys/encrypted-keys/encrypted.c
@@ -141,23 +141,22 @@ static int valid_ecryptfs_desc(const char *ecryptfs_desc)
  */
 static int valid_master_desc(const char *new_desc, const char *orig_desc)
 {
-        if (!memcmp(new_desc, KEY_TRUSTED_PREFIX, KEY_TRUSTED_PREFIX_LEN)) {
-                if (strlen(new_desc) == KEY_TRUSTED_PREFIX_LEN)
-                        goto out;
-                if (orig_desc)
-                        if (memcmp(new_desc, orig_desc, KEY_TRUSTED_PREFIX_LEN))
-                                goto out;
-        } else if (!memcmp(new_desc, KEY_USER_PREFIX, KEY_USER_PREFIX_LEN)) {
-                if (strlen(new_desc) == KEY_USER_PREFIX_LEN)
-                        goto out;
-                if (orig_desc)
-                        if (memcmp(new_desc, orig_desc, KEY_USER_PREFIX_LEN))
-                                goto out;
-        } else
-                goto out;
+        int prefix_len;
+
+        if (!strncmp(new_desc, KEY_TRUSTED_PREFIX, KEY_TRUSTED_PREFIX_LEN))
+                prefix_len = KEY_TRUSTED_PREFIX_LEN;
+        else if (!strncmp(new_desc, KEY_USER_PREFIX, KEY_USER_PREFIX_LEN))
+                prefix_len = KEY_USER_PREFIX_LEN;
+        else
+                return -EINVAL;
+
+        if (!new_desc[prefix_len])
+                return -EINVAL;
+
+        if (orig_desc && strncmp(new_desc, orig_desc, prefix_len))
+                return -EINVAL;
+
         return 0;
-out:
-        return -EINVAL;
 }
 
 /*