linux-kernel - Re: [PATCH 10/64] lib80211: Use struct

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Message-ID: <YQDwiz1SdrzFKOWw@kroah.com>
Date:   Wed, 28 Jul 2021 07:52:11 +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 10/64] lib80211: Use struct_group() for memcpy() region

On Tue, Jul 27, 2021 at 01:58:01PM -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
> ieee80211_hdr 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.
> 
> "pahole" shows no size nor member offset changes to struct ieee80211_hdr.
> "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>
> ---
>  drivers/staging/rtl8723bs/core/rtw_security.c | 5 +++--
>  drivers/staging/rtl8723bs/core/rtw_xmit.c     | 5 +++--
>  include/linux/ieee80211.h                     | 8 +++++---
>  net/wireless/lib80211_crypt_ccmp.c            | 3 ++-
>  4 files changed, 13 insertions(+), 8 deletions(-)

For the staging portion:

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