This is a note to let you know that I've just added the patch titled
xfrm: policy: check policy direction value
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-policy-check-policy-direction-value.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 7bab09631c2a303f87a7eb7e3d69e888673b9b7e Mon Sep 17 00:00:00 2001
From: Vladis Dronov <vdronov@xxxxxxxxxx>
Date: Wed, 2 Aug 2017 19:50:14 +0200
Subject: xfrm: policy: check policy direction value
From: Vladis Dronov <vdronov@xxxxxxxxxx>
commit 7bab09631c2a303f87a7eb7e3d69e888673b9b7e upstream.
The 'dir' parameter in xfrm_migrate() is a user-controlled byte which is used
as an array index. This can lead to an out-of-bound access, kernel lockup and
DoS. Add a check for the 'dir' value.
This fixes CVE-2017-11600.
References: https://bugzilla.redhat.com/show_bug.cgi?id=1474928
Fixes: 80c9abaabf42 ("[XFRM]: Extension for dynamic update of endpoint address(es)")
Reported-by: "bo Zhang" <zhangbo5891001@xxxxxxxxx>
Signed-off-by: Vladis Dronov <vdronov@xxxxxxxxxx>
Signed-off-by: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/xfrm/xfrm_policy.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -3275,9 +3275,15 @@ int xfrm_migrate(const struct xfrm_selec
struct xfrm_state *x_new[XFRM_MAX_DEPTH];
struct xfrm_migrate *mp;
+ /* Stage 0 - sanity checks */
if ((err = xfrm_migrate_check(m, num_migrate)) < 0)
goto out;
+ if (dir >= XFRM_POLICY_MAX) {
+ err = -EINVAL;
+ goto out;
+ }
+
/* Stage 1 - find policy */
if ((pol = xfrm_migrate_policy_find(sel, dir, type, net)) == NULL) {
err = -ENOENT;
Patches currently in stable-queue which might be from vdronov@xxxxxxxxxx are
queue-4.4/xfrm-policy-check-policy-direction-value.patch