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

From: Yury Gribov <y dot gribov at samsung dot com>
To: Andrey Ryabinin <a dot ryabinin at samsung dot com>, Alexey Preobrazhensky <preobr at google dot com>, 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>, Jakub Jelinek <jakub at redhat dot com>
Date: Tue, 22 Jul 2014 14:30:55 +0400
Subject: Re: [PATCH] Support asan-fixed-shadow-offset in GCC
Authentication-results: sourceware.org; auth=none
References: <CA+FTKhusLtf9frmh7VcNMWpwDdanHT3mgUh8PhduDY9Ff4sCww at mail dot gmail dot com> <53CE3A67 dot 1050908 at samsung dot com>

It is required for Kernel AddressSanitizer, as the shadow offset is
not known at the compile time,


To get shadow offset this patch uses function __asan_get_shadow_ptr.
Wouldn't be more effective just to read variable instead of function call?

Depends on how much logic you want to hide there. If it's just "returnsomething" than surebut if you need some synchronization or complex calculations, accessingglobal would not be enough.

-Y

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

References:
- [PATCH] Support asan-fixed-shadow-offset in GCC
  - From: Alexey Preobrazhensky
- Re: [PATCH] Support asan-fixed-shadow-offset in GCC
  - From: Andrey Ryabinin

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