linux-kernel - Re: [PATCHv2 2/2] scsi: ibmvscsis: Ensure partition name is properly NUL terminated

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Message-ID: <CAGXu5jKT88hPBcgj_mbxA5sREQQYBYkdKMkn-WFAUa+=TNUeaw@mail.gmail.com>
Date:   Tue, 11 Sep 2018 12:33:12 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Laura Abbott <labbott@...hat.com>
Cc:     "Bryant G. Ly" <bryantly@...ux.vnet.ibm.com>,
        Michael Cyr <mikecyr@...ux.vnet.ibm.com>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org,
        target-devel <target-devel@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv2 2/2] scsi: ibmvscsis: Ensure partition name is properly
 NUL terminated

On Tue, Sep 11, 2018 at 12:22 PM, Laura Abbott <labbott@...hat.com> wrote:
>
> While reviewing another part of the code, Kees noticed that the
> strncpy of the partition name might not always be NUL terminated. Switch
> to using strscpy which does this safely.
>
> Reported-by: Kees Cook <keescook@...omium.org>
> Signed-off-by: Laura Abbott <labbott@...hat.com>

Reviewed-by: Kees Cook <keescook@...omium.org>

-Kees

> ---
> v2: Switch to strscpy instead of just strlcpy
> ---
>  drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c b/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
> index b3a029ad07cd..f42a619198c4 100644
> --- a/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
> +++ b/drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
> @@ -3477,7 +3477,7 @@ static int ibmvscsis_probe(struct vio_dev *vdev,
>         snprintf(vscsi->eye, sizeof(vscsi->eye), "VSCSI %s", vdev->name);
>
>         vscsi->dds.unit_id = vdev->unit_address;
> -       strncpy(vscsi->dds.partition_name, partition_name,
> +       strscpy(vscsi->dds.partition_name, partition_name,
>                 sizeof(vscsi->dds.partition_name));
>         vscsi->dds.partition_num = partition_number;
>
> --
> 2.17.1
>



-- 
Kees Cook
Pixel Security