This is a note to let you know that I've just added the patch titled
xfrm: skip policies marked as dead while rehashing
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-skip-policies-marked-as-dead-while-rehashing.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 862591bf4f519d1b8d859af720fafeaebdd0162a Mon Sep 17 00:00:00 2001
From: Florian Westphal <fw@xxxxxxxxx>
Date: Wed, 27 Dec 2017 23:25:45 +0100
Subject: xfrm: skip policies marked as dead while rehashing
From: Florian Westphal <fw@xxxxxxxxx>
commit 862591bf4f519d1b8d859af720fafeaebdd0162a upstream.
syzkaller triggered following KASAN splat:
BUG: KASAN: slab-out-of-bounds in xfrm_hash_rebuild+0xdbe/0xf00 net/xfrm/xfrm_policy.c:618
read of size 2 at addr ffff8801c8e92fe4 by task kworker/1:1/23 [..]
Workqueue: events xfrm_hash_rebuild [..]
__asan_report_load2_noabort+0x14/0x20 mm/kasan/report.c:428
xfrm_hash_rebuild+0xdbe/0xf00 net/xfrm/xfrm_policy.c:618
process_one_work+0xbbf/0x1b10 kernel/workqueue.c:2112
worker_thread+0x223/0x1990 kernel/workqueue.c:2246 [..]
The reproducer triggers:
1016 if (error) {
1017 list_move_tail(&walk->walk.all, &x->all);
1018 goto out;
1019 }
in xfrm_policy_walk() via pfkey (it sets tiny rcv space, dump
callback returns -ENOBUFS).
In this case, *walk is located the pfkey socket struct, so this socket
becomes visible in the global policy list.
It looks like this is intentional -- phony walker has walk.dead set to 1
and all other places skip such "policies".
Ccing original authors of the two commits that seem to expose this
issue (first patch missed ->dead check, second patch adds pfkey
sockets to policies dumper list).
Fixes: 880a6fab8f6ba5b ("xfrm: configure policy hash table thresholds by netlink")
Fixes: 12a169e7d8f4b1c ("ipsec: Put dumpers on the dump list")
Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Cc: Timo Teras <timo.teras@xxxxxx>
Cc: Christophe Gouault <christophe.gouault@xxxxxxxxx>
Reported-by: syzbot <bot+c028095236fcb6f4348811565b75084c754dc729@xxxxxxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Florian Westphal <fw@xxxxxxxxx>
Signed-off-by: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/xfrm/xfrm_policy.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -610,7 +610,8 @@ static void xfrm_hash_rebuild(struct wor
/* re-insert all policies by order of creation */
list_for_each_entry_reverse(policy, &net->xfrm.policy_all, walk.all) {
- if (xfrm_policy_id2dir(policy->index) >= XFRM_POLICY_MAX) {
+ if (policy->walk.dead ||
+ xfrm_policy_id2dir(policy->index) >= XFRM_POLICY_MAX) {
/* skip socket policies */
continue;
}
Patches currently in stable-queue which might be from fw@xxxxxxxxx are
queue-4.14/xfrm-skip-policies-marked-as-dead-while-rehashing.patch
queue-4.14/netfilter-x_tables-avoid-out-of-bounds-reads-in-xt_request_find_-match-target.patch
queue-4.14/netfilter-on-sockopt-acquire-sock-lock-only-in-the-required-scope.patch
queue-4.14/netfilter-xt_rateest-acquire-xt_rateest_mutex-for-hash-insert.patch
queue-4.14/xfrm-don-t-call-xfrm_policy_cache_flush-while-holding-spinlock.patch