From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by mail.openembedded.org (Postfix) with ESMTP id 1A45F70101 for ; Wed, 4 May 2016 09:52:39 +0000 (UTC) Received: from orsmga003.jf.intel.com ([10.7.209.27]) by fmsmga103.fm.intel.com with ESMTP; 04 May 2016 02:52:38 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.24,576,1455004800"; d="scan'208";a="798516944" Received: from jlock-mobl2.ger.corp.intel.com ([10.252.24.244]) by orsmga003.jf.intel.com with ESMTP; 04 May 2016 02:52:35 -0700 Message-ID: <1462355553.6485.5.camel@linux.intel.com> From: Joshua G Lock To: Armin Kuster , openembedded-core@lists.openembedded.org Date: Wed, 04 May 2016 10:52:33 +0100 In-Reply-To: <1461867811-7837-1-git-send-email-akuster808@gmail.com> References: <1461867811-7837-1-git-send-email-akuster808@gmail.com> X-Mailer: Evolution 3.18.5.2 (3.18.5.2-1.fc23) Mime-Version: 1.0 Cc: Armin Kuster Subject: Re: [master][krogoth][PATCH 1/2] qemu: Security fix CVE-2016-2857 X-BeenThere: openembedded-core@lists.openembedded.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Patches and discussions about the oe-core layer List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 04 May 2016 09:52:44 -0000 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit Hi Armin, On Thu, 2016-04-28 at 11:23 -0700, Armin Kuster wrote: > From: Armin Kuster > I've been seeing: "qemu: uncaught target signal 11 (Segmentation fault) - core dumped" when trying to build gobject-introspection for qemux86 recently and narrowed it down to this change, if I revert this patch the use of qemu-native by gobject-introspection no longer causes a segmentation fault. Are we missing some related patches for this CVE fix? I haven't dug into the details, but noticed that Fedora's CVE-2016-2857 diffstat[1] is much larger than ours[2]. Regards, Joshua 1. http://pkgs.fedoraproject.org/cgit/rpms/qemu.git/commit/?id=54cb1301 c61f0be7b96e343902bb09be081b34fe 2. http://git.openembedded.org/openembedded-core/commit/?id=d1b972a55c5 9a3f3336b3ebd309532dc204ea97b > --- >  .../recipes-devtools/qemu/qemu/CVE-2016-2857.patch | 51 > ++++++++++++++++++++++ >  meta/recipes-devtools/qemu/qemu_2.5.0.bb           |  1 + >  2 files changed, 52 insertions(+) >  create mode 100644 meta/recipes-devtools/qemu/qemu/CVE-2016- > 2857.patch > > diff --git a/meta/recipes-devtools/qemu/qemu/CVE-2016-2857.patch > b/meta/recipes-devtools/qemu/qemu/CVE-2016-2857.patch > new file mode 100644 > index 0000000..73cfa2a > --- /dev/null > +++ b/meta/recipes-devtools/qemu/qemu/CVE-2016-2857.patch > @@ -0,0 +1,51 @@ > +From 362786f14a753d8a5256ef97d7c10ed576d6572b Mon Sep 17 00:00:00 > 2001 > +From: Prasad J Pandit > +Date: Wed, 2 Mar 2016 17:29:58 +0530 > +Subject: [PATCH] net: check packet payload length > + > +While computing IP checksum, 'net_checksum_calculate' reads > +payload length from the packet. It could exceed the given 'data' > +buffer size. Add a check to avoid it. > + > +Reported-by: Liu Ling > +Signed-off-by: Prasad J Pandit > +Signed-off-by: Jason Wang > + > +Upstream-Status: Backport > +CVE: CVE-2016-2857 > + > +http://git.qemu.org/?p=qemu.git;a=commit;h=362786f14a753d8a5256ef97d > 7c10ed576d6572b > +Signed-off-by: Armin Kuster > + > +--- > + net/checksum.c | 10 ++++++++-- > + 1 file changed, 8 insertions(+), 2 deletions(-) > + > +Index: qemu-2.5.0/net/checksum.c > +=================================================================== > +--- qemu-2.5.0.orig/net/checksum.c > ++++ qemu-2.5.0/net/checksum.c > +@@ -59,6 +59,11 @@ void net_checksum_calculate(uint8_t *dat > +     int hlen, plen, proto, csum_offset; > +     uint16_t csum; > +  > ++    /* Ensure data has complete L2 & L3 headers. */ > ++    if (length < 14 + 20) { > ++        return; > ++    } > ++ > +     if ((data[14] & 0xf0) != 0x40) > +  return; /* not IPv4 */ > +     hlen  = (data[14] & 0x0f) * 4; > +@@ -76,8 +81,9 @@ void net_checksum_calculate(uint8_t *dat > +  return; > +     } > +  > +-    if (plen < csum_offset+2) > +- return; > ++    if (plen < csum_offset + 2 || 14 + hlen + plen > length) { > ++        return; > ++    } > +  > +     data[14+hlen+csum_offset]   = 0; > +     data[14+hlen+csum_offset+1] = 0; > diff --git a/meta/recipes-devtools/qemu/qemu_2.5.0.bb b/meta/recipes- > devtools/qemu/qemu_2.5.0.bb > index e9d9a8d..7622386 100644 > --- a/meta/recipes-devtools/qemu/qemu_2.5.0.bb > +++ b/meta/recipes-devtools/qemu/qemu_2.5.0.bb > @@ -11,6 +11,7 @@ SRC_URI += "file://configure-fix-Darwin-target-dete > ction.patch \ >              file://CVE-2016-2197.patch \ >              file://CVE-2016-2198.patch \ >              file://pathlimit.patch \ > +            file://CVE-2016-2857.patch \ >             " >  SRC_URI_prepend = "http://wiki.qemu-project.org/download/${BP}.tar.b > z2" >  SRC_URI[md5sum] = "f469f2330bbe76e3e39db10e9ac4f8db" > --  > 2.3.5 >