linux-hardening - Re: [PATCH v3 0/3] staging: rtl*: Check for NULL header value

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Date:   Thu, 20 Jan 2022 15:32:52 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Kees Cook <keescook@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Larry Finger <Larry.Finger@...inger.net>,
        Phillip Potter <phil@...lpotter.co.uk>,
        Michael Straube <straube.linux@...il.com>,
        Fabio Aiuto <fabioaiuto83@...il.com>,
        Florian Schilhabel <florian.c.schilhabel@...glemail.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Zhansaya Bagdauletkyzy <zhansayabagdaulet@...il.com>,
        Ivan Safonov <insafonov@...il.com>,
        Martin Kaiser <martin@...ser.cx>,
        Yang Li <yang.lee@...ux.alibaba.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Marco Cesati <marcocesati@...il.com>,
        Joe Perches <joe@...ches.com>,
        "Fabio M. De Francesco" <fmdefrancesco@...il.com>,
        linux-kernel@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH v3 0/3] staging: rtl*: Check for NULL header value

Hi,

On 1/18/22 20:33, Kees Cook wrote:
> Hi,
> 
> When building with -Warray-bounds, the following warning is emitted:
> 
> In file included from ./include/linux/string.h:253,
>                  from ./arch/x86/include/asm/page_32.h:22,
>                  from ./arch/x86/include/asm/page.h:14,
>                  from ./arch/x86/include/asm/thread_info.h:12,
>                  from ./include/linux/thread_info.h:60,
>                  from ./arch/x86/include/asm/preempt.h:7,
>                  from ./include/linux/preempt.h:78,
>                  from ./include/linux/rcupdate.h:27,
>                  from ./include/linux/rculist.h:11,
>                  from ./include/linux/sched/signal.h:5,
>                  from ./drivers/staging/rtl8723bs/include/drv_types.h:17,
>                  from drivers/staging/rtl8723bs/core/rtw_recv.c:7:
> In function 'memcpy',
>     inlined from 'wlanhdr_to_ethhdr' at drivers/staging/rtl8723bs/core/rtw_recv.c:1554:2:
> ./include/linux/fortify-string.h:41:33: warning: '__builtin_memcpy' offset [0, 5] is out of the bounds [0, 0] [-Warray-bounds]
>    41 | #define __underlying_memcpy     __builtin_memcpy
>       |                                 ^
> 
> This is due to various paths to the memcpy() where the compile could
> see the destination buffer having a NULL value. This series fixes this
> by both eliminating cases where NULL returns were impossible and adding
> missing NULL checks where values were possible.
> 
> Thanks!

Thanks, the series looks good to me:

Reviewed-by: Hans de Goede <hdegoede@...hat.com>

for the entire series.

Regards,

Hans




> -Kees
> 
> v1: https://lore.kernel.org/lkml/20220113002001.3498383-1-keescook@chromium.org/
> v2: https://lore.kernel.org/lkml/20220115042427.824542-1-keescook@chromium.org
> v3:
>  - fix paste-o causing build failures (0day)
> 
> 
> Kees Cook (3):
>   staging: r8188eu: Drop get_recvframe_data()
>   staging: rtl8723bs: Drop get_recvframe_data()
>   staging: rtl8712: Drop get_recvframe_data()
> 
>  drivers/staging/r8188eu/core/rtw_recv.c        |  6 +++++-
>  drivers/staging/r8188eu/hal/rtl8188e_rxdesc.c  |  4 +---
>  drivers/staging/r8188eu/include/rtw_recv.h     |  9 ---------
>  drivers/staging/rtl8712/rtl871x_recv.c         |  4 ++--
>  drivers/staging/rtl8712/rtl871x_recv.h         |  8 --------
>  drivers/staging/rtl8723bs/core/rtw_recv.c      | 11 ++++++++---
>  drivers/staging/rtl8723bs/hal/rtl8723bs_recv.c |  3 +--
>  drivers/staging/rtl8723bs/include/rtw_recv.h   | 11 -----------
>  8 files changed, 17 insertions(+), 39 deletions(-)
>