linux-hardening - Re: [PATCH v2 13/63] iommu/amd: Use struct

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Date:   Wed, 18 Aug 2021 13:34:23 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     linux-kernel@...r.kernel.org, Will Deacon <will@...nel.org>,
        iommu@...ts.linux-foundation.org,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-staging@...ts.linux.dev,
        linux-block@...r.kernel.org, linux-kbuild@...r.kernel.org,
        clang-built-linux@...glegroups.com,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2 13/63] iommu/amd: Use struct_group() for memcpy()
 region

On Tue, Aug 17, 2021 at 11:04:43PM -0700, Kees Cook wrote:
> In preparation for FORTIFY_SOURCE performing compile-time and run-time
> field bounds checking for memcpy(), memmove(), and memset(), avoid
> intentionally writing across neighboring fields.
> 
> Use struct_group() in struct ivhd_entry around members ext and hidh, so
> they can be referenced together. This will allow memcpy() and sizeof()
> to more easily reason about sizes, improve readability, and avoid future
> warnings about writing beyond the end of ext.
> 
> "pahole" shows no size nor member offset changes to struct ivhd_entry.
> "objdump -d" shows no object code changes.
> 
> Cc: Joerg Roedel <joro@...tes.org>
> Cc: Will Deacon <will@...nel.org>
> Cc: iommu@...ts.linux-foundation.org
> Signed-off-by: Kees Cook <keescook@...omium.org>

Acked-by: Joerg Roedel <jroedel@...e.de>