mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
synced 2024-10-01 01:35:54 -04:00
39 lines
1.4 KiB
Diff
39 lines
1.4 KiB
Diff
|
From f843ee6dd019bcece3e74e76ad9df0155655d0df Mon Sep 17 00:00:00 2001
|
||
|
|
From: Andy Whitcroft <apw@canonical.com>
|
||
|
|
Date: Thu, 23 Mar 2017 07:45:44 +0000
|
||
|
|
Subject: xfrm_user: validate XFRM_MSG_NEWAE incoming ESN size harder
|
||
|
|
|
||
|
|
Kees Cook has pointed out that xfrm_replay_state_esn_len() is subject to
|
||
|
|
wrapping issues. To ensure we are correctly ensuring that the two ESN
|
||
|
|
structures are the same size compare both the overall size as reported
|
||
|
|
by xfrm_replay_state_esn_len() and the internal length are the same.
|
||
|
|
|
||
|
|
CVE-2017-7184
|
||
|
|
Signed-off-by: Andy Whitcroft <apw@canonical.com>
|
||
|
|
Acked-by: Steffen Klassert <steffen.klassert@secunet.com>
|
||
|
|
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
||
|
|
---
|
||
|
|
net/xfrm/xfrm_user.c | 6 +++++-
|
||
|
|
1 file changed, 5 insertions(+), 1 deletion(-)
|
||
|
|
|
||
|
|
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
|
||
|
|
index cdf887f..40a8aa3 100644
|
||
|
|
--- a/net/xfrm/xfrm_user.c
|
||
|
|
+++ b/net/xfrm/xfrm_user.c
|
||
|
|
@@ -412,7 +412,11 @@ static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_es
|
||
|
|
up = nla_data(rp);
|
||
|
|
ulen = xfrm_replay_state_esn_len(up);
|
||
|
|
|
||
|
|
- if (nla_len(rp) < ulen || xfrm_replay_state_esn_len(replay_esn) != ulen)
|
||
|
|
+ /* Check the overall length and the internal bitmap length to avoid
|
||
|
|
+ * potential overflow. */
|
||
|
|
+ if (nla_len(rp) < ulen ||
|
||
|
|
+ xfrm_replay_state_esn_len(replay_esn) != ulen ||
|
||
|
|
+ replay_esn->bmp_len != up->bmp_len)
|
||
|
|
return -EINVAL;
|
||
|
|
|
||
|
|
if (up->replay_window > up->bmp_len * sizeof(__u32) * 8)
|
||
|
|
--
|
||
|
|
cgit v1.1
|
||
|
|
|