linux-kernel - Re: [PATCH 6/6] scsi: qedf: use correct strncpy() size

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Message-ID: <alpine.OSX.2.00.1802071126080.1466@administrators-MacBook-Pro.local>
Date:   Wed, 7 Feb 2018 11:26:43 -0500 (EST)
From:   Chad Dupuis <chad.dupuis@...ium.com>
To:     Arnd Bergmann <arnd@...db.de>
cc:     linux-scsi@...r.kernel.org,
        "James E . J . Bottomley" <jejb@...ux.vnet.ibm.com>,
        QLogic-Storage-Upstream@...ium.com,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Nicolas Pitre <nico@...aro.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Saurav Kashyap <saurav.kashyap@...ium.com>,
        Arun Easi <arun.easi@...ium.com>,
        Nilesh Javali <nilesh.javali@...ium.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/6] scsi: qedf: use correct strncpy() size


On Fri, 2 Feb 2018, 8:12am, Arnd Bergmann wrote:

> gcc-8 warns during link-time optimization that the strncpy() call
> passes the size of the source buffer rather than the destination:
> 
> drivers/scsi/qedf/qedf_dbg.c: In function 'qedf_uevent_emit':
> include/linux/string.h:253: error: 'strncpy' specified bound depends on the length of the source argument [-Werror=stringop-overflow=]
> 
> This changes it to strscpy() with the correct length, guaranteeing
> a properly nul-terminated string of the right size.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/scsi/qedf/qedf_dbg.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 

Reasonable security precaution.

Acked-by: Chad Dupuis <chad.dupuis@...ium.com>