linux-hardening - Re: [PATCH v2 22/63] HID: cp2112: Use struct

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Date:   Fri, 20 Aug 2021 08:48:49 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Jiri Kosina <jikos@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        linux-input@...r.kernel.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 22/63] HID: cp2112: Use struct_group() for memcpy()
 region

On Fri, Aug 20, 2021 at 03:01:43PM +0200, Jiri Kosina wrote:
> On Tue, 17 Aug 2021, 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 cp2112_string_report around members report,
> > length, type, and string, 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
> > report.
> > 
> > "pahole" shows no size nor member offset changes to struct
> > cp2112_string_report.  "objdump -d" shows no meaningful object
> > code changes (i.e. only source line number induced differences.)
> > 
> > Cc: Jiri Kosina <jikos@...nel.org>
> > Cc: Benjamin Tissoires <benjamin.tissoires@...hat.com>
> > Cc: linux-input@...r.kernel.org
> > Signed-off-by: Kees Cook <keescook@...omium.org>
> 
> Applied, thanks.

I'm not sure if my other HTML email got through, but please don't apply
these to separate trees -- struct_group() is introduced as part of this
series.

-- 
Kees Cook