linux-hardening - Re: [PATCH] powerpc/64s: Disable stack variable initialisation for prom

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Message-ID: <CAHk-=wihbCSydApZcH21hev5pcKu=-CrQgwp6qmPwuv5kMpwxQ@mail.gmail.com>
Date:   Mon, 18 Jul 2022 11:34:50 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH] powerpc/64s: Disable stack variable initialisation for prom_init

On Mon, Jul 18, 2022 at 6:44 AM Michael Ellerman <mpe@...erman.id.au> wrote:
>
> With GCC 12, allmodconfig enables CONFIG_INIT_STACK_ALL_PATTERN, which
> causes the compiler to emit memset calls to initialise on-stack
> variables with a pattern.

Ahh, and that explains why "volatile" made no difference. That did
seem very odd.

Thanks for figuring it out,

                   Linus