linux-hardening - Re: [PATCH 08/64] staging: rtl8192u: Use struct

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Date:   Wed, 28 Jul 2021 07:45:59 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     linux-hardening@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Keith Packard <keithpac@...zon.com>,
        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 08/64] staging: rtl8192u: Use struct_group() for memcpy()
 region

On Tue, Jul 27, 2021 at 01:57:59PM -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() around members addr1, addr2, and addr3 in struct
> rtl_80211_hdr_4addr, and members qui, qui_type, qui_subtype, version,
> and ac_info in struct ieee80211_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. Additionally replace zero sized
> arrays with flexible arrays in struct ieee_param.
> 
> "pahole" shows no size nor member offset changes to struct
> rtl_80211_hdr_4addr nor struct ieee80211_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@...omium.org>

Acked-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>