Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S947189AbcJaV0k (ORCPT ); Mon, 31 Oct 2016 17:26:40 -0400 Received: from albireo.enyo.de ([5.158.152.32]:56124 "EHLO albireo.enyo.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S947172AbcJaV0j (ORCPT ); Mon, 31 Oct 2016 17:26:39 -0400 From: Florian Weimer To: Jann Horn Cc: Daniel Micay , Kees Cook , kernel-hardening@lists.openwall.com, Andrew Morton , Michal Hocko , Ingo Molnar , Andy Lutomirski , LKML Subject: Re: [kernel-hardening] Re: [PATCH] fork: make whole stack_canary random References: <1477922641-2221-1-git-send-email-jann@thejh.net> <20161031162918.GA2994@pc.thejh.net> <87mvhks0vs.fsf@mid.deneb.enyo.de> <1477947388.8761.3.camel@gmail.com> <1477947674.8761.4.camel@gmail.com> <87ins8rzqm.fsf@mid.deneb.enyo.de> <20161031212251.GB3286@pc.thejh.net> Date: Mon, 31 Oct 2016 22:26:26 +0100 In-Reply-To: <20161031212251.GB3286@pc.thejh.net> (Jann Horn's message of "Mon, 31 Oct 2016 22:22:51 +0100") Message-ID: <877f8orz0d.fsf@mid.deneb.enyo.de> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 386 Lines: 11 * Jann Horn: > Until recently: Zero, no guard pages below stacks, stack overflow > goes straight into some other allocation. > Now: One guard page, thanks to a lot of work by Andy Lutomirski. > (I think that change is in the current 4.9-rc3 kernel, but not in > any stable kernel yet.) Sorry, I meant for the stack allocation in user space. (I'm very much a user space person only.)