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[PATCH] Support asan-fixed-shadow-offset in GCC

From: Alexey Preobrazhensky <preobr at google dot com>
To: GCC Patches <gcc-patches at gcc dot gnu dot org>
Cc: Kostya Serebryany <kcc at google dot com>, Dmitry Vyukov <dvyukov at google dot com>, David Li <davidxl at google dot com>, Yury Gribov <y dot gribov at samsung dot com>, Andrey Ryabinin <a dot ryabinin at samsung dot com>, Jakub Jelinek <jakub at redhat dot com>
Date: Mon, 21 Jul 2014 23:00:11 +0400
Subject: [PATCH] Support asan-fixed-shadow-offset in GCC
Authentication-results: sourceware.org; auth=none

Hi all,

This patch adds support for non-fixed shadow in asan stack instrumentation.

It is required for Kernel AddressSanitizer, as the shadow offset is
not known at the compile time, and the shadow may not be allocated
during the early boot stages.

This option is intended to be triggered by -fsanitize=kernel-address
option, together with enabling instrumentation with calls.

Bootstrapped&regtested on x86_64.

Codereview: https://codereview.appspot.com/118040043/

--
Alexey

Attachment: no-fixed-shadow.diff
Description: Text document

Follow-Ups:
- Re: [PATCH] Support asan-fixed-shadow-offset in GCC
  - From: Yury Gribov
- Re: [PATCH] Support asan-fixed-shadow-offset in GCC
  - From: Andrey Ryabinin

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