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From: John Garry <john.g.garry@oracle.com>
To: Vegard Nossum <vegard.nossum@oracle.com>,
	Kees Cook <keescook@chromium.org>,
	Bart Van Assche <bvanassche@acm.org>
Cc: Hannes Reinecke <hare@suse.de>,
	Himanshu Madhani <himanshu.madhani@oracle.com>,
	Adaptec OEM Raid Solutions <aacraid@microsemi.com>,
	"James E.J. Bottomley" <jejb@linux.ibm.com>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	linux-scsi@vger.kernel.org, stable@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org
Subject: Re: [PATCH] scsi: aacraid: Allocate cmd_priv with scsicmd
Date: Tue, 31 Jan 2023 09:02:07 +0000	[thread overview]
Message-ID: <e4b04313-20e9-0060-5e29-17fac62a8234@oracle.com> (raw)
In-Reply-To: <1bb8de35-16ba-6c7c-0ef6-67a7226a0a2d@oracle.com>

On 28/01/2023 18:40, Vegard Nossum wrote:
> aac_priv() uses scsi_cmd_priv() which has the comment:
> 
> /*
>   * Return the driver private allocation behind the command.
>   * Only works if cmd_size is set in the host template.
>   */
> 
> This is set for this driver:
> 
> static struct scsi_host_template aac_driver_template = {
> [...]
>     .cmd_size                       = sizeof(struct aac_cmd_priv),
> 
> I looked around to see if there was some kind of "allocate cmd" helper,
> but couldn't find it -- scsi_ioctl_reset() allocates one (together with
> struct request) and there are a few uses of ->cmd_size in
> drivers/scsi/scsi_lib.c but there doesn't seem to be a common code path
> for this.
> 
> I guess you could use dev->host->hostt->cmd_size or something, but that
> doesn't seem worth it since this is driver specific and we already know
> what the correct value should be.

How this driver allocates a SCSI cmd in this fashion is not proper, and 
hostt->cmd_size would only apply when the SCSI command is allocated in 
the proper fashion, that being as a request - __scsi_execute() -> 
scsi_alloc_request() being an example.

Hannes did have a conversion for this driver to allocate a request in
https://urldefense.com/v3/__https://lore.kernel.org/linux-scsi/8efc0e24-3000-39d9-7676-e0896145f247@suse.de/__;!!ACWV5N9M2RV99hQ!MealB8BN3q8cxYSaB7yKEbHyDmFTNl0YNVQXpVw8Zd0-iNqQ-k4IFxnqONpixfavb0DqGWnkbDVjBJCE22mYq5Ly8Xs$ 
- hopefully we can progress that work at some stage.

Thanks,
John

  reply	other threads:[~2023-01-31  9:06 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-01-28  0:04 [PATCH] scsi: aacraid: Allocate cmd_priv with scsicmd Kees Cook
2023-01-28 18:40 ` Vegard Nossum
2023-01-31  9:02   ` John Garry [this message]
2023-01-30 18:14 ` Hannes Reinecke
2023-01-30 18:19 ` Bart Van Assche
2023-02-08 23:16 ` Martin K. Petersen
2023-02-14 16:57 ` Martin K. Petersen

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