From owner-svn-src-all@freebsd.org  Tue Oct 25 17:14:51 2016
Return-Path: <owner-svn-src-all@freebsd.org>
Delivered-To: svn-src-all@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id D5B36C21227;
 Tue, 25 Oct 2016 17:14:51 +0000 (UTC)
 (envelope-from glebius@FreeBSD.org)
Received: from repo.freebsd.org (repo.freebsd.org
 [IPv6:2610:1c1:1:6068::e6a:0])
 (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
 (Client did not present a certificate)
 by mx1.freebsd.org (Postfix) with ESMTPS id A6F8C1793;
 Tue, 25 Oct 2016 17:14:51 +0000 (UTC)
 (envelope-from glebius@FreeBSD.org)
Received: from repo.freebsd.org ([127.0.1.37])
 by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id u9PHEo3b076363;
 Tue, 25 Oct 2016 17:14:50 GMT (envelope-from glebius@FreeBSD.org)
Received: (from glebius@localhost)
 by repo.freebsd.org (8.15.2/8.15.2/Submit) id u9PHEoma076362;
 Tue, 25 Oct 2016 17:14:50 GMT (envelope-from glebius@FreeBSD.org)
Message-Id: <201610251714.u9PHEoma076362@repo.freebsd.org>
X-Authentication-Warning: repo.freebsd.org: glebius set sender to
 glebius@FreeBSD.org using -f
From: Gleb Smirnoff <glebius@FreeBSD.org>
Date: Tue, 25 Oct 2016 17:14:50 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
 svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org
Subject: svn commit: r307938 - stable/11/sys/amd64/amd64
X-SVN-Group: stable-11
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
X-BeenThere: svn-src-all@freebsd.org
X-Mailman-Version: 2.1.23
Precedence: list
List-Id: "SVN commit messages for the entire src tree \(except for &quot;
 user&quot; and &quot; projects&quot; \)" <svn-src-all.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/svn-src-all>,
 <mailto:svn-src-all-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-all/>
List-Post: <mailto:svn-src-all@freebsd.org>
List-Help: <mailto:svn-src-all-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/svn-src-all>,
 <mailto:svn-src-all-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 25 Oct 2016 17:14:51 -0000

Author: glebius
Date: Tue Oct 25 17:14:50 2016
New Revision: 307938
URL: https://svnweb.freebsd.org/changeset/base/307938

Log:
  Merge r307936:
    The argument validation in r296956 was not enough to close all possible
    overflows in sysarch(2).
  
    Submitted by: Kun Yang <kun.yang chaitin.com>
    Patch by:     kib
    Security:     SA-16:15

Modified:
  stable/11/sys/amd64/amd64/sys_machdep.c
Directory Properties:
  stable/11/   (props changed)

Modified: stable/11/sys/amd64/amd64/sys_machdep.c
==============================================================================
--- stable/11/sys/amd64/amd64/sys_machdep.c	Tue Oct 25 17:13:58 2016	(r307937)
+++ stable/11/sys/amd64/amd64/sys_machdep.c	Tue Oct 25 17:14:50 2016	(r307938)
@@ -608,6 +608,8 @@ amd64_set_ldt(td, uap, descs)
 		largest_ld = uap->start + uap->num;
 		if (largest_ld > max_ldt_segment)
 			largest_ld = max_ldt_segment;
+		if (largest_ld < uap->start)
+			return (EINVAL);
 		i = largest_ld - uap->start;
 		mtx_lock(&dt_lock);
 		bzero(&((struct user_segment_descriptor *)(pldt->ldt_base))
@@ -620,7 +622,8 @@ amd64_set_ldt(td, uap, descs)
 		/* verify range of descriptors to modify */
 		largest_ld = uap->start + uap->num;
 		if (uap->start >= max_ldt_segment ||
-		    largest_ld > max_ldt_segment)
+		    largest_ld > max_ldt_segment ||
+		    largest_ld < uap->start)
 			return (EINVAL);
 	}