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Sender: Larry Finger <larry.finger@gmail.com>
Subject: Re: [PATCH 07/64] staging: rtl8192e: Use struct_group() for memcpy()
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To:     Kees Cook <keescook@chromium.org>, linux-hardening@vger.kernel.org
Cc:     "Gustavo A. R. Silva" <gustavoars@kernel.org>,
        Keith Packard <keithpac@amazon.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        linux-kernel@vger.kernel.org, linux-wireless@vger.kernel.org,
        netdev@vger.kernel.org, dri-devel@lists.freedesktop.org,
        linux-staging@lists.linux.dev, linux-block@vger.kernel.org,
        linux-kbuild@vger.kernel.org, clang-built-linux@googlegroups.com
References: <20210727205855.411487-1-keescook@chromium.org>
 <20210727205855.411487-8-keescook@chromium.org>
From:   Larry Finger <Larry.Finger@lwfinger.net>
Message-ID: <fa3a9a2f-b611-7fe4-9359-88fa51239765@lwfinger.net>
Date:   Tue, 27 Jul 2021 17:30:45 -0500
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On 7/27/21 3:57 PM, 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() around members addr1, addr2, and addr3 in struct
> rtllib_hdr_4addr, and members qui, qui_type, qui_subtype, version,
> and ac_info in struct rtllib_qos_information_element, 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 addr1 and qui.
> 
> "pahole" shows no size nor member offset changes to struct
> rtllib_hdr_4addr nor struct rtllib_qos_information_element. "objdump -d"
> shows no meaningful object code changes (i.e. only source line number
> induced differences and optimizations).
> 
> Signed-off-by: Kees Cook<keescook@chromium.org>

Tested-by: Larry Finger <Larry.Finger@lwfinger.net>
Acked-by: Larry Finger <Larry.Finger@lwfinger.net>

Looks good.

Larry