linux-hardening - Re: [PATCH] scsi: ibmvscsis: Silence -Warray-bounds warning

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Date:   Wed, 9 Feb 2022 15:53:21 -0800
From:   Tyrel Datwyler <tyreld@...ux.ibm.com>
To:     Kees Cook <keescook@...omium.org>,
        Michael Cyr <mikecyr@...ux.ibm.com>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, target-devel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] scsi: ibmvscsis: Silence -Warray-bounds warning

On 2/7/22 10:12 PM, Kees Cook wrote:
> Instead of doing a cast to storage that is too small, add a union for
> the high 64 bits. Silences the warnings under -Warray-bounds:
> 
> drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c: In function 'ibmvscsis_send_messages':
> drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c:1934:44: error: array subscript 'struct viosrp_crq[0]' is partly outside array bounds of 'u64[1]' {aka 'long long unsigned int[1]'} [-Werror=array-bounds]
>  1934 |                                         crq->valid = VALID_CMD_RESP_EL;
>       |                                            ^~
> drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c:1875:13: note: while referencing 'msg_hi'
>  1875 |         u64 msg_hi = 0;
>       |             ^~~~~~
> 
> There is no change to the resulting binary instructions.
> 
> Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
> Link: https://lore.kernel.org/lkml/20220125142430.75c3160e@canb.auug.org.au
> Cc: Michael Cyr <mikecyr@...ux.ibm.com>
> Cc: "James E.J. Bottomley" <jejb@...ux.ibm.com>
> Cc: "Martin K. Petersen" <martin.petersen@...cle.com>
> Cc: Tyrel Datwyler <tyreld@...ux.ibm.com>
> Cc: linux-scsi@...r.kernel.org
> Cc: target-devel@...r.kernel.org
> Signed-off-by: Kees Cook <keescook@...omium.org>
> ---
>  drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c |  9 +++------

Reviewed-by: Tyrel Datwyler <tyreld@...ux.ibm.com>