linux-kernel - Re: [PATCH v2 9/9] scsi: Check sense buffer size at build time

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Message-ID: <20180801082516.GE26378@infradead.org>
Date:   Wed, 1 Aug 2018 01:25:16 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Jens Axboe <axboe@...nel.dk>,
        Christoph Hellwig <hch@...radead.org>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        Tejun Heo <tj@...nel.org>, Borislav Petkov <bp@...en8.de>,
        "David S. Miller" <davem@...emloft.net>,
        "Manoj N. Kumar" <manoj@...ux.vnet.ibm.com>,
        "Matthew R. Ochs" <mrochs@...ux.vnet.ibm.com>,
        Uma Krishnan <ukrishn@...ux.vnet.ibm.com>,
        "Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Cyrille Pitchen <cyrille.pitchen@...e-electrons.com>,
        Juergen Gross <jgross@...e.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Sagar Dharia <sdharia@...eaurora.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Vinod Koul <vinod.koul@...el.com>,
        David Kershner <david.kershner@...sys.com>,
        linux-block@...r.kernel.org, linux-ide@...r.kernel.org,
        linux-scsi@...r.kernel.org, target-devel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 9/9] scsi: Check sense buffer size at build time

On Tue, Jul 31, 2018 at 12:51:54PM -0700, Kees Cook wrote:
> To avoid introducing problems like those fixed in commit f7068114d45e
> ("sr: pass down correctly sized SCSI sense buffer"), this creates a macro
> wrapper for scsi_execute() that verifies the size of the sense buffer
> similar to what was done for command string sizes in commit 3756f6401c30
> ("exec: avoid gcc-8 warning for get_task_comm").
> 
> Another solution could be to add a length argument to scsi_execute(),
> but this function already takes a lot of arguments and Jens was not fond
> of that approach.
> 
> Additionally, this moves the SCSI_SENSE_BUFFERSIZE definition into
> scsi_device.h, and removes a redundant include for scsi_device.h from
> scsi_cmnd.h.
> 
> Signed-off-by: Kees Cook <keescook@...omium.org>

Looks good,

Reviewed-by: Christoph Hellwig <hch@....de>