From mboxrd@z Thu Jan 1 00:00:00 1970 From: Carmelo AMOROSO Date: Tue, 11 Jan 2011 15:56:02 +0000 Subject: Re: [PATCH 1/2] stackprotector: add stack smashing protector Message-Id: <4D2C7D92.1090104@st.com> List-Id: References: <1293111851-7175-1-git-send-email-filippo.arcidiacono@st.com> <4D245D16.5010702@st.com> In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="windows-1254" Content-Transfer-Encoding: base64 To: linux-arm-kernel@lists.infradead.org LS0tLS1CRUdJTiBQR1AgU0lHTkVEIE1FU1NBR0UtLS0tLQpIYXNoOiBTSEExCgpPbiAxLzExLzIw MTEgNjozMCBBTSwgTWlrZSBGcnlzaW5nZXIgd3JvdGU6Cj4gd2hhdCBhcmUgeW91IHVzaW5nIHRv IHRlc3QgdGhpcyA/IGlzIHRoZXJlIGEgc2ltcGxlIHN0cmNweSBvciBzaW1pbGFyCj4gY29kZSB5 b3UgcnVuIGFzIGEga2VybmVsIG1vZHVsZSB0aGF0J2xsIGFsbG93IG1lIHRvIHZlcmlmeSA/Cj4g LW1pa2UKPiAKSGkgTWlrZSwKeWVzLCBhIHNpbXBsZSBrZXJuZWwgbW9kdWxlIHdpdGggYSBpbml0 IGZ1bmMgdGhhdCB1c2Ugc3RyY3B5IG9yIG1lbWNweQp0byB3cml0ZSBvdmVyIHRoZSBib3VuZGFy aWVzIG9mIGFuIGxvY2FsIGFycmF5IHZhcmlhYmxlIGlzIGVub3VnaC4KQXMgeW91IGtub3csIHRo ZSBhcnJheSBoYXMgdG8gYmUgbGFyZ2VyIHRoYW4gOCBieXRlcyB0byBtYXRjaCB3aXRoIHRoZQpn Y2MgaGV1cmlzdGljIGFuZCBnZW5lcmF0ZSB0aGUgY2FsbCB0byB0aGUgZ3VhcmQuCgpDaGVlcnMs CkNhcm1lbG8KCgoKLS0tLS1CRUdJTiBQR1AgU0lHTkFUVVJFLS0tLS0KVmVyc2lvbjogR251UEcg djEuNC4xMCAoTWluZ1czMikKQ29tbWVudDogVXNpbmcgR251UEcgd2l0aCBNb3ppbGxhIC0gaHR0 cDovL2VuaWdtYWlsLm1vemRldi5vcmcvCgppRVlFQVJFQ0FBWUZBazBzZlpJQUNna1FvUnEvM0Jy SzFzOGtmd0NlSWpheUlvYUhhcHdlRzUzaWNwMXlvQ04rCnlwTUFuQTA4Y2h4VHU0OWVQNFFZVFFV OFV6TzRQVnBwCj15c2k0Ci0tLS0tRU5EIFBHUCBTSUdOQVRVUkUtLS0tLQr/9Oi6ey5uxyuJt5+u ia2GKyWKy/+x6d22F6WKd/+6ey5uxyuJt6WKe7H+yP+Ke2F5uh3Kh9qZ6yxqB62iZqOit2iaj++B 6v+R6ud6X+iuAyit6ZqOit2iaiKd+hq2G22n//++B6v+R6ud6f+iuD+ZqOit2iaj+Kd+j+EK From mboxrd@z Thu Jan 1 00:00:00 1970 From: carmelo.amoroso@st.com (Carmelo AMOROSO) Date: Tue, 11 Jan 2011 16:56:02 +0100 Subject: [PATCH 1/2] stackprotector: add stack smashing protector generic implementation In-Reply-To: References: <1293111851-7175-1-git-send-email-filippo.arcidiacono@st.com> <4D245D16.5010702@st.com> Message-ID: <4D2C7D92.1090104@st.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 1/11/2011 6:30 AM, Mike Frysinger wrote: > what are you using to test this ? is there a simple strcpy or similar > code you run as a kernel module that'll allow me to verify ? > -mike > Hi Mike, yes, a simple kernel module with a init func that use strcpy or memcpy to write over the boundaries of an local array variable is enough. As you know, the array has to be larger than 8 bytes to match with the gcc heuristic and generate the call to the guard. Cheers, Carmelo -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk0sfZIACgkQoRq/3BrK1s8kfwCeIjayIoaHapweG53icp1yoCN+ ypMAnA08chxTu49eP4QYTQU8UzO4PVpp =ysi4 -----END PGP SIGNATURE----- From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932290Ab1AKP4q (ORCPT ); Tue, 11 Jan 2011 10:56:46 -0500 Received: from eu1sys200aog108.obsmtp.com ([207.126.144.125]:33885 "EHLO eu1sys200aog108.obsmtp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932160Ab1AKP4o (ORCPT ); Tue, 11 Jan 2011 10:56:44 -0500 From: Carmelo AMOROSO To: Mike Frysinger Cc: "linux-kernel@vger.kernel.org" , Filippo ARCIDIACONO , "linux-sh@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "nicolas.pitre@linaro.org" , "nico@fluxnic.net" Date: Tue, 11 Jan 2011 16:56:02 +0100 Subject: Re: [PATCH 1/2] stackprotector: add stack smashing protector generic implementation Thread-Topic: [PATCH 1/2] stackprotector: add stack smashing protector generic implementation Thread-Index: AcuxqA/hqFnFKR1+SOeJ3YfzE17dig== Message-ID: <4D2C7D92.1090104@st.com> References: <1293111851-7175-1-git-send-email-filippo.arcidiacono@st.com> <4D245D16.5010702@st.com> In-Reply-To: Accept-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-enigmail-version: 1.1.1 user-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.13) Gecko/20101207 Lightning/1.0b2 Thunderbird/3.1.7 acceptlanguage: en-US Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from base64 to 8bit by mail.home.local id p0BFut3R020945 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 1/11/2011 6:30 AM, Mike Frysinger wrote: > what are you using to test this ? is there a simple strcpy or similar > code you run as a kernel module that'll allow me to verify ? > -mike > Hi Mike, yes, a simple kernel module with a init func that use strcpy or memcpy to write over the boundaries of an local array variable is enough. As you know, the array has to be larger than 8 bytes to match with the gcc heuristic and generate the call to the guard. Cheers, Carmelo -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk0sfZIACgkQoRq/3BrK1s8kfwCeIjayIoaHapweG53icp1yoCN+ ypMAnA08chxTu49eP4QYTQU8UzO4PVpp =ysi4 -----END PGP SIGNATURE----- {.n++%ݶw{.n+{G{ayʇڙ,jfhz_(階ݢj"mG?&~iOzv^m ?I