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Message-ID: <CAGXu5jJt3uNWVXDD=GR6oVwn=g7O=Jcz9sxai5q10X9yyR56XA@mail.gmail.com>
Date: Wed, 10 Apr 2019 09:09:35 -0700
From: Kees Cook <keescook@...omium.org>
To: Alexander Potapenko <glider@...gle.com>
Cc: Masahiro Yamada <yamada.masahiro@...ionext.com>, James Morris <jmorris@...ei.org>,
"Serge E. Hallyn" <serge@...lyn.com>,
linux-security-module <linux-security-module@...r.kernel.org>,
linux-kbuild <linux-kbuild@...r.kernel.org>, Nick Desaulniers <ndesaulniers@...gle.com>,
Kostya Serebryany <kcc@...gle.com>, Dmitry Vyukov <dvyukov@...gle.com>, Kees Cook <keescook@...omium.org>,
Sandeep Patil <sspatil@...roid.com>, Laura Abbott <labbott@...hat.com>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>
Subject: Re: [PATCH v4 2/3] initmem: introduce CONFIG_INIT_ALL_HEAP
On Wed, Apr 10, 2019 at 6:18 AM Alexander Potapenko <glider@...gle.com> wrote:
>
> This config option adds the possibility to initialize newly allocated
> pages and heap objects with a 0xAA pattern.
> There's already a number of places where allocations are initialized
> based on the presence of __GFP_ZERO flag. We just change this code so
> that under CONFIG_INIT_ALL_HEAP these allocations are always initialized
> with either 0x00 or 0xAA depending on the __GFP_ZERO.
Why not just make __GFP_ZERO unconditional instead? This looks like
it'd be simpler and not need arch-specific implementation?
--
Kees Cook
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