linux-hardening - Re: [PATCH 54/64] ipv6: Use struct_group() to zero rt6

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Message-ID: <202107310801.D50070F@keescook>
Date:   Sat, 31 Jul 2021 08:01:57 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     linux-hardening@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Keith Packard <keithpac@...zon.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.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
Subject: Re: [PATCH 54/64] ipv6: Use struct_group() to zero rt6_info

On Thu, Jul 29, 2021 at 11:58:50AM -0700, Jakub Kicinski wrote:
> On Tue, 27 Jul 2021 13:58:45 -0700 Kees Cook wrote:
> > In preparation for FORTIFY_SOURCE performing compile-time and run-time
> > field bounds checking for memset(), avoid intentionally writing across
> > neighboring fields.
> > 
> > Add struct_group() to mark region of struct rt6_info that should be
> > initialized to zero.
> 
> memset_after() ?

Oh, hah. Yes. I will adjust for v2.

-- 
Kees Cook