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

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Message-ID: <nycvar.YFH.7.76.2108201501340.15313@cbobk.fhfr.pm>
Date:   Fri, 20 Aug 2021 15:01:43 +0200 (CEST)
From:   Jiri Kosina <jikos@...nel.org>
To:     Kees Cook <keescook@...omium.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 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.

-- 
Jiri Kosina
SUSE Labs