46 lines
1.5 KiB
Diff
46 lines
1.5 KiB
Diff
From 3881b164810a564714dfdc16520b0fe538ae4bf7 Mon Sep 17 00:00:00 2001
|
|
From: David Howells <dhowells@redhat.com>
|
|
Date: Mon, 27 Jul 2015 15:23:43 +0100
|
|
Subject: [PATCH] KEYS: ensure we free the assoc array edit if edit is valid
|
|
|
|
__key_link_end is not freeing the associated array edit structure
|
|
and this leads to a 512 byte memory leak each time an identical
|
|
existing key is added with add_key().
|
|
|
|
The reason the add_key() system call returns okay is that
|
|
key_create_or_update() calls __key_link_begin() before checking to see
|
|
whether it can update a key directly rather than adding/replacing - which
|
|
it turns out it can. Thus __key_link() is not called through
|
|
__key_instantiate_and_link() and __key_link_end() must cancel the edit.
|
|
|
|
CVE-2015-1333
|
|
|
|
Signed-off-by: Colin Ian King <colin.king@canonical.com>
|
|
Signed-off-by: David Howells <dhowells@redhat.com>
|
|
---
|
|
security/keys/keyring.c | 8 +++++---
|
|
1 file changed, 5 insertions(+), 3 deletions(-)
|
|
|
|
diff --git a/security/keys/keyring.c b/security/keys/keyring.c
|
|
index e72548b5897e..d33437007ad2 100644
|
|
--- a/security/keys/keyring.c
|
|
+++ b/security/keys/keyring.c
|
|
@@ -1181,9 +1181,11 @@ void __key_link_end(struct key *keyring,
|
|
if (index_key->type == &key_type_keyring)
|
|
up_write(&keyring_serialise_link_sem);
|
|
|
|
- if (edit && !edit->dead_leaf) {
|
|
- key_payload_reserve(keyring,
|
|
- keyring->datalen - KEYQUOTA_LINK_BYTES);
|
|
+ if (edit) {
|
|
+ if (!edit->dead_leaf) {
|
|
+ key_payload_reserve(keyring,
|
|
+ keyring->datalen - KEYQUOTA_LINK_BYTES);
|
|
+ }
|
|
assoc_array_cancel_edit(edit);
|
|
}
|
|
up_write(&keyring->sem);
|
|
--
|
|
2.4.3
|
|
|