linux-hardening - Re: [PATCH] powerpc/signal32: Use struct

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Message-ID: <202111190839.B6EC699B1@keescook>
Date:   Fri, 19 Nov 2021 08:42:08 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        kernel test robot <lkp@...el.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Nicholas Piggin <npiggin@...il.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-hardening@...r.kernel.org" <linux-hardening@...r.kernel.org>
Subject: Re: [PATCH] powerpc/signal32: Use struct_group() to zero spe regs

On Fri, Nov 19, 2021 at 05:35:00PM +0100, Christophe Leroy wrote:
> Neither do I. I was just scared by what I saw while reviewing your patch. A
> cleanup is probably required but it can be another patch.

Heh, understood! For my end, my objective with the fortify work is to
either split cross-member memcpy() calls (which is usually undesirable) or
add a struct group so it can be seen as a "single member" memcpy again
(and usually results in 0 differences in binary output). :)

-- 
Kees Cook