This is a note to let you know that I've just added the patch titled
xfrm: check id proto in validate_tmpl()
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-check-id-proto-in-validate_tmpl.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 6a53b7593233ab9e4f96873ebacc0f653a55c3e1 Mon Sep 17 00:00:00 2001
From: Cong Wang <xiyou.wangcong@xxxxxxxxx>
Date: Mon, 27 Nov 2017 11:15:16 -0800
Subject: xfrm: check id proto in validate_tmpl()
From: Cong Wang <xiyou.wangcong@xxxxxxxxx>
commit 6a53b7593233ab9e4f96873ebacc0f653a55c3e1 upstream.
syzbot reported a kernel warning in xfrm_state_fini(), which
indicates that we have entries left in the list
net->xfrm.state_all whose proto is zero. And
xfrm_id_proto_match() doesn't consider them as a match with
IPSEC_PROTO_ANY in this case.
Proto with value 0 is probably not a valid value, at least
verify_newsa_info() doesn't consider it valid either.
This patch fixes it by checking the proto value in
validate_tmpl() and rejecting invalid ones, like what iproute2
does in xfrm_xfrmproto_getbyname().
Reported-by: syzbot <syzkaller@xxxxxxxxxxxxxxxx>
Cc: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
Cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Cong Wang <xiyou.wangcong@xxxxxxxxx>
Signed-off-by: Steffen Klassert <steffen.klassert@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/xfrm/xfrm_user.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -1402,6 +1402,21 @@ static int validate_tmpl(int nr, struct
default:
return -EINVAL;
}
+
+ switch (ut[i].id.proto) {
+ case IPPROTO_AH:
+ case IPPROTO_ESP:
+ case IPPROTO_COMP:
+#if IS_ENABLED(CONFIG_IPV6)
+ case IPPROTO_ROUTING:
+ case IPPROTO_DSTOPTS:
+#endif
+ case IPSEC_PROTO_ANY:
+ break;
+ default:
+ return -EINVAL;
+ }
+
}
return 0;
Patches currently in stable-queue which might be from xiyou.wangcong@xxxxxxxxx are
queue-4.4/netfilter-xt_rateest-acquire-xt_rateest_mutex-for-hash-insert.patch
queue-4.4/xfrm-check-id-proto-in-validate_tmpl.patch