linux-hardening - Re: [PATCH 09/64] staging: rtl8723bs: Avoid field-overflowing memcpy()

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Date:   Wed, 28 Jul 2021 07:46:27 +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 09/64] staging: rtl8723bs: Avoid field-overflowing
 memcpy()

On Tue, Jul 27, 2021 at 01:58:00PM -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.
> 
> Adjust memcpy() destination to be the named structure itself, rather than
> the first member, allowing memcpy() to correctly reason about the size.
> 
> "objdump -d" shows no object code changes.
> 
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
>  drivers/staging/rtl8723bs/core/rtw_mlme.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)


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