This is a note to let you know that I've just added the patch titled
xfrm: Fix a race in the xdst pcpu cache.
to the 4.14-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-fix-a-race-in-the-xdst-pcpu-cache.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 76a4201191814a0061cb5c861fafb9ecaa764846 Mon Sep 17 00:00:00 2001
From: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
Date: Wed, 10 Jan 2018 12:14:28 +0100
Subject: xfrm: Fix a race in the xdst pcpu cache.
From: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
commit 76a4201191814a0061cb5c861fafb9ecaa764846 upstream.
We need to run xfrm_resolve_and_create_bundle() with
bottom halves off. Otherwise we may reuse an already
released dst_enty when the xfrm lookup functions are
called from process context.
Fixes: c30d78c14a813db39a647b6a348b428 ("xfrm: add xdst pcpu cache")
Reported-by: Darius Ski <darius.ski@xxxxxxxxx>
Signed-off-by: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
Acked-by: David Miller <davem@xxxxxxxxxxxxx>,
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/xfrm/xfrm_policy.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -2056,8 +2056,11 @@ xfrm_bundle_lookup(struct net *net, cons
if (num_xfrms <= 0)
goto make_dummy_bundle;
+ local_bh_disable();
xdst = xfrm_resolve_and_create_bundle(pols, num_pols, fl, family,
- xflo->dst_orig);
+ xflo->dst_orig);
+ local_bh_enable();
+
if (IS_ERR(xdst)) {
err = PTR_ERR(xdst);
if (err != -EAGAIN)
@@ -2144,9 +2147,12 @@ struct dst_entry *xfrm_lookup(struct net
goto no_transform;
}
+ local_bh_disable();
xdst = xfrm_resolve_and_create_bundle(
pols, num_pols, fl,
family, dst_orig);
+ local_bh_enable();
+
if (IS_ERR(xdst)) {
xfrm_pols_put(pols, num_pols);
err = PTR_ERR(xdst);
Patches currently in stable-queue which might be from steffen.klassert@xxxxxxxxxxx are
queue-4.14/xfrm-fix-a-race-in-the-xdst-pcpu-cache.patch