linux-kernel - Re: [PATCH 6/6] scsi: Check sense buffer size at build time

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Date:   Thu, 24 May 2018 07:11:44 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Jens Axboe <axboe@...nel.dk>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        James Bottomley <James.Bottomley@...senpartnership.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>,
        linux-block@...r.kernel.org, linux-ide@...r.kernel.org,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/6] scsi: Check sense buffer size at build time

> +/* Make sure any sense buffer is the correct size. */
> +#define scsi_execute(sdev, cmd, data_direction, buffer, bufflen, sense,	\
> +		     sshdr, timeout, retries, flags, rq_flags, resid)	\
> +({									\
> +	BUILD_BUG_ON((sense) != NULL &&					\
> +		     sizeof(sense) != SCSI_SENSE_BUFFERSIZE);		\
> +	__scsi_execute(sdev, cmd, data_direction, buffer, bufflen,	\
> +		       sense, sshdr, timeout, retries, flags, rq_flags,	\
> +		       resid);						\
> +})

This macro gets evaluated in the scsi_execute_req inline function just
below.  So either we need to include scsi_sense.h/scsi_common.h in
scsi_device.h, or just move scsi_execute_req out of line.  The latter
sounds better to me a it's not really used in a fast path.