This is a note to let you know that I've just added the patch titled
xfrm_user: validate XFRM_MSG_NEWAE incoming ESN size harder
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
xfrm_user-validate-xfrm_msg_newae-incoming-esn-size-harder.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From f843ee6dd019bcece3e74e76ad9df0155655d0df Mon Sep 17 00:00:00 2001
From: Andy Whitcroft <apw@xxxxxxxxxxxxx>
Date: Thu, 23 Mar 2017 07:45:44 +0000
Subject: xfrm_user: validate XFRM_MSG_NEWAE incoming ESN size harder
From: Andy Whitcroft <apw@xxxxxxxxxxxxx>
commit f843ee6dd019bcece3e74e76ad9df0155655d0df upstream.
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@xxxxxxxxxxxxx>
Acked-by: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/xfrm/xfrm_user.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -412,7 +412,11 @@ static inline int xfrm_replay_verify_len
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)
Patches currently in stable-queue which might be from apw@xxxxxxxxxxxxx are
queue-4.4/xfrm_user-validate-xfrm_msg_newae-incoming-esn-size-harder.patch
queue-4.4/xfrm_user-validate-xfrm_msg_newae-xfrma_replay_esn_val-replay_window.patch