linux-hardening - Re: [PATCH v2 60/63] net/af_iucv: Use struct_group() to zero struct iucv

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Date:   Thu, 9 Sep 2021 08:14:52 +0200
From:   Karsten Graul <kgraul@...ux.ibm.com>
To:     Kees Cook <keescook@...omium.org>, linux-kernel@...r.kernel.org
Cc:     Julian Wiedmann <jwi@...ux.ibm.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, linux-s390@...r.kernel.org,
        netdev@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-wireless@...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,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2 60/63] net/af_iucv: Use struct_group() to zero struct
 iucv_sock region

On 18/08/2021 08:05, Kees Cook wrote:
> In preparation for FORTIFY_SOURCE performing compile-time and run-time
> field bounds checking for memset(), avoid intentionally writing across
> neighboring fields.
> 
> Add struct_group() to mark the region of struct iucv_sock that gets
> initialized to zero. Avoid the future warning:
> 
> In function 'fortify_memset_chk',
>     inlined from 'iucv_sock_alloc' at net/iucv/af_iucv.c:476:2:
> ./include/linux/fortify-string.h:199:4: warning: call to '__write_overflow_field' declared with attribute warning: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Wattribute-warning]
>   199 |    __write_overflow_field(p_size_field, size);
>       |    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> Cc: Julian Wiedmann <jwi@...ux.ibm.com>
> Cc: Karsten Graul <kgraul@...ux.ibm.com>
> Cc: "David S. Miller" <davem@...emloft.net>
> Cc: Jakub Kicinski <kuba@...nel.org>
> Cc: linux-s390@...r.kernel.org
> Cc: netdev@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
>  include/net/iucv/af_iucv.h | 10 ++++++----
>  net/iucv/af_iucv.c         |  2 +-
>  2 files changed, 7 insertions(+), 5 deletions(-)

No objections.
Acked-by: Karsten Graul <kgraul@...ux.ibm.com>

Thank you.