forked from AUR/linux-vfio
50 lines
1.8 KiB
Diff
50 lines
1.8 KiB
Diff
From 1c3a5e72b70bcfaf342075a3fa5fcbdf99302a3f Mon Sep 17 00:00:00 2001
|
|
Message-Id: <1c3a5e72b70bcfaf342075a3fa5fcbdf99302a3f.1514245012.git.jan.steffens@gmail.com>
|
|
In-Reply-To: <b0bfa7c33cead5dd87267cfd4c29fda47dc1adc4.1514245012.git.jan.steffens@gmail.com>
|
|
References: <b0bfa7c33cead5dd87267cfd4c29fda47dc1adc4.1514245012.git.jan.steffens@gmail.com>
|
|
From: Steffen Klassert <steffen.klassert@secunet.com>
|
|
Date: Fri, 22 Dec 2017 10:44:57 +0100
|
|
Subject: [PATCH 2/3] xfrm: Fix stack-out-of-bounds read on socket policy
|
|
lookup.
|
|
|
|
When we do tunnel or beet mode, we pass saddr and daddr from the
|
|
template to xfrm_state_find(), this is ok. On transport mode,
|
|
we pass the addresses from the flowi, assuming that the IP
|
|
addresses (and address family) don't change during transformation.
|
|
This assumption is wrong in the IPv4 mapped IPv6 case, packet
|
|
is IPv4 and template is IPv6.
|
|
|
|
Fix this by catching address family missmatches of the policy
|
|
and the flow already before we do the lookup.
|
|
|
|
Reported-by: syzbot <syzkaller@googlegroups.com>
|
|
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
|
|
---
|
|
net/xfrm/xfrm_policy.c | 8 +++++++-
|
|
1 file changed, 7 insertions(+), 1 deletion(-)
|
|
|
|
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
|
|
index a2e531bf4f976308..c79ed3bed5d4dc2f 100644
|
|
--- a/net/xfrm/xfrm_policy.c
|
|
+++ b/net/xfrm/xfrm_policy.c
|
|
@@ -1169,9 +1169,15 @@ static struct xfrm_policy *xfrm_sk_policy_lookup(const struct sock *sk, int dir,
|
|
again:
|
|
pol = rcu_dereference(sk->sk_policy[dir]);
|
|
if (pol != NULL) {
|
|
- bool match = xfrm_selector_match(&pol->selector, fl, family);
|
|
+ bool match;
|
|
int err = 0;
|
|
|
|
+ if (pol->family != family) {
|
|
+ pol = NULL;
|
|
+ goto out;
|
|
+ }
|
|
+
|
|
+ match = xfrm_selector_match(&pol->selector, fl, family);
|
|
if (match) {
|
|
if ((sk->sk_mark & pol->mark.m) != pol->mark.v) {
|
|
pol = NULL;
|
|
--
|
|
2.15.1
|
|
|