From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754759AbcFPRhn (ORCPT ); Thu, 16 Jun 2016 13:37:43 -0400 Received: from mail-oi0-f53.google.com ([209.85.218.53]:35714 "EHLO mail-oi0-f53.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754130AbcFPRhm (ORCPT ); Thu, 16 Jun 2016 13:37:42 -0400 MIME-Version: 1.0 In-Reply-To: References: From: Andy Lutomirski Date: Thu, 16 Jun 2016 10:37:21 -0700 Message-ID: Subject: Re: [PATCH 06/13] fork: Add generic vmalloced stack support To: Kees Cook Cc: Andy Lutomirski , "linux-kernel@vger.kernel.org" , "x86@kernel.org" , Borislav Petkov , Nadav Amit , Brian Gerst , "kernel-hardening@lists.openwall.com" , Linus Torvalds , Josh Poimboeuf Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Jun 16, 2016 at 10:25 AM, Kees Cook wrote: > On Wed, Jun 15, 2016 at 5:28 PM, Andy Lutomirski wrote: >> If CONFIG_VMAP_STACK is selected, kernel stacks are allocated with >> vmalloc_node. >> >> Signed-off-by: Andy Lutomirski >> --- >> arch/Kconfig | 12 ++++++++++++ >> kernel/fork.c | 45 +++++++++++++++++++++++++++++++++++++-------- >> 2 files changed, 49 insertions(+), 8 deletions(-) >> >> diff --git a/arch/Kconfig b/arch/Kconfig >> index d794384a0404..1acd262036b0 100644 >> --- a/arch/Kconfig >> +++ b/arch/Kconfig >> @@ -658,4 +658,16 @@ config ARCH_NO_COHERENT_DMA_MMAP >> config CPU_NO_EFFICIENT_FFS >> def_bool n >> >> +config HAVE_ARCH_VMAP_STACK >> + def_bool n > > In the style of HAVE_ARCH_SECCOMP_FILTER, can you detail all the > things an architecture needs to do to correctly support a vmap stack? > This will help with arch porting. Done.