netdev - Re: [PATCH] ip/xfrm: Fix deleteall when having many policies installed

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 19 Jan 2017 08:57:56 +0100
From:   Alexander Heinlein <alexander.heinlein@...unet.com>
To:     Stephen Hemminger <stephen@...workplumber.org>
CC:     <netdev@...r.kernel.org>, <shemminger@...l.org>
Subject: Re: [PATCH] ip/xfrm: Fix deleteall when having many policies
 installed

From 192cf19b3a97871a508ad57ba5893d1719877f13 Mon Sep 17 00:00:00 2001
From: Alexander Heinlein <alexander.heinlein@...unet.com>
Date: Mon, 16 Jan 2017 14:48:25 +0100
Subject: [PATCH] ip/xfrm: Fix deleteall when having many policies installed

Fix "Policy buffer overflow" when trying to use deleteall with many
policies installed.

Signed-off-by: Alexander Heinlein <alexander.heinlein@...unet.com>
---
 ip/xfrm_policy.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/ip/xfrm_policy.c b/ip/xfrm_policy.c
index cc9c0f1..451b982 100644
--- a/ip/xfrm_policy.c
+++ b/ip/xfrm_policy.c
@@ -732,10 +732,8 @@ static int xfrm_policy_keep(const struct sockaddr_nl *who,
 	if (!xfrm_policy_filter_match(xpinfo, ptype))
 		return 0;
 
-	if (xb->offset > xb->size) {
-		fprintf(stderr, "Policy buffer overflow\n");
-		return -1;
-	}
+	if (xb->offset + NLMSG_LENGTH(sizeof(*xpid)) > xb->size)
+		return 0;
 
 	new_n = (struct nlmsghdr *)(xb->buf + xb->offset);
 	new_n->nlmsg_len = NLMSG_LENGTH(sizeof(*xpid));
-- 
2.1.4



Download attachment "signature.asc" of type "application/pgp-signature" (834 bytes)