From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752065AbdIIWZJ (ORCPT ); Sat, 9 Sep 2017 18:25:09 -0400 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:41753 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751965AbdIIWYx (ORCPT ); Sat, 9 Sep 2017 18:24:53 -0400 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, "Andrey Konovalov" , "Steffen Klassert" Date: Sat, 09 Sep 2017 22:47:14 +0100 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) Subject: [PATCH 3.16 005/233] af_key: Fix slab-out-of-bounds in pfkey_compile_policy. In-Reply-To: X-SA-Exim-Connect-IP: 2a02:8011:400e:2:6f00:88c8:c921:d332 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.16.48-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Steffen Klassert commit d90c902449a7561f1b1d58ba5a0d11728ce8b0b2 upstream. The sadb_x_sec_len is stored in the unit 'byte divided by eight'. So we have to multiply this value by eight before we can do size checks. Otherwise we may get a slab-out-of-bounds when we memcpy the user sec_ctx. Fixes: df71837d502 ("[LSM-IPSec]: Security association restriction.") Reported-by: Andrey Konovalov Tested-by: Andrey Konovalov Signed-off-by: Steffen Klassert Signed-off-by: Ben Hutchings --- net/key/af_key.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/net/key/af_key.c +++ b/net/key/af_key.c @@ -3282,7 +3282,7 @@ static struct xfrm_policy *pfkey_compile p += pol->sadb_x_policy_len*8; sec_ctx = (struct sadb_x_sec_ctx *)p; if (len < pol->sadb_x_policy_len*8 + - sec_ctx->sadb_x_sec_len) { + sec_ctx->sadb_x_sec_len*8) { *dir = -EINVAL; goto out; }