From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-yw0-f197.google.com (mail-yw0-f197.google.com [209.85.161.197]) by kanga.kvack.org (Postfix) with ESMTP id DCA026B025F for ; Mon, 7 Aug 2017 15:05:42 -0400 (EDT) Received: by mail-yw0-f197.google.com with SMTP id c13so18811517ywa.2 for ; Mon, 07 Aug 2017 12:05:42 -0700 (PDT) Received: from mail-yw0-x22a.google.com (mail-yw0-x22a.google.com. [2607:f8b0:4002:c05::22a]) by mx.google.com with ESMTPS id w7si1710221ybw.658.2017.08.07.12.05.41 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 07 Aug 2017 12:05:42 -0700 (PDT) Received: by mail-yw0-x22a.google.com with SMTP id s143so8430453ywg.1 for ; Mon, 07 Aug 2017 12:05:41 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: References: <1502131739.1803.12.camel@gmail.com> From: Kostya Serebryany Date: Mon, 7 Aug 2017 12:05:40 -0700 Message-ID: Subject: Re: binfmt_elf: use ELF_ET_DYN_BASE only for PIE breaks asan Content-Type: multipart/alternative; boundary="001a114dd15e76999405562e88c9" Sender: owner-linux-mm@kvack.org List-ID: To: Kees Cook Cc: Daniel Micay , Dmitry Vyukov , Michal Hocko , Andrew Morton , "linux-mm@kvack.org" , Rik van Riel , Reid Kleckner , Peter Collingbourne , Evgeniy Stepanov --001a114dd15e76999405562e88c9 Content-Type: text/plain; charset="UTF-8" On Mon, Aug 7, 2017 at 11:59 AM, Kees Cook wrote: > On Mon, Aug 7, 2017 at 11:56 AM, Kostya Serebryany wrote: > > Is it possible to implement some userspace<=>kernel interface that will > > allow applications (sanitizers) > > to request *fixed* address ranges from the kernel at startup (so that the > > kernel couldn't refuse)? > > Wouldn't building non-PIE accomplish this? > Well, many asan users do need PIE. Then, non-PIE only applies to the main executable, all DSOs are still PIC and the old change that moved DSOs from 0x7fff to 0x5555 caused us quite a bit of trouble too, even w/o PIE > > -Kees > > -- > Kees Cook > Pixel Security > --001a114dd15e76999405562e88c9 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable


On Mon, Aug 7, 2017 at 11:59 AM, Kees Cook <keescook@google.com&= gt; wrote:
On Mon= , Aug 7, 2017 at 11:56 AM, Kostya Serebryany <kcc@google.com> wrote:
> Is it possible to implement some userspace<=3D>kernel interface = that will
> allow applications (sanitizers)
> to request *fixed* address ranges from the kernel at startup (so that = the
> kernel couldn't refuse)?

Wouldn't building non-PIE accomplish this?
=
Well, many asan users do need PIE.=C2=A0
Then, non= -PIE only applies to the main executable, all DSOs are still=C2=A0
PIC and the old change that moved DSOs from 0x7fff to 0x5555 caused us qu= ite a bit of trouble too, even w/o PIE
=C2=A0

-Kees

--
Kees Cook
Pixel Security

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