linux-kernel - Re: [PATCH v2 1/4] scsi: sd: reject invalid pr_read_keys() num

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Message-ID: <4eb8b77a-6553-42ec-ab85-a1cddb7d8f23@suse.de>
Date: Thu, 27 Nov 2025 19:03:51 +0100
From: Hannes Reinecke <hare@...e.de>
To: Stefan Hajnoczi <stefanha@...hat.com>, linux-block@...r.kernel.org
Cc: Keith Busch <kbusch@...nel.org>,
 "Martin K. Petersen" <martin.petersen@...cle.com>,
 linux-kernel@...r.kernel.org,
 "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
 Christoph Hellwig <hch@....de>, Mike Christie <michael.christie@...cle.com>,
 linux-nvme@...ts.infradead.org, Jens Axboe <axboe@...nel.dk>,
 linux-scsi@...r.kernel.org, Sagi Grimberg <sagi@...mberg.me>
Subject: Re: [PATCH v2 1/4] scsi: sd: reject invalid pr_read_keys() num_keys
 values

On 11/27/25 16:54, Stefan Hajnoczi wrote:
> The pr_read_keys() interface has a u32 num_keys parameter. The SCSI
> PERSISTENT RESERVE IN command has a maximum READ KEYS service action
> size of 65536 bytes. Reject num_keys values that are too large to fit
> into the SCSI command.
> 
> This will become important when pr_read_keys() is exposed to untrusted
> userspace via an <linux/pr.h> ioctl.
> 
> Signed-off-by: Stefan Hajnoczi <stefanha@...hat.com>
> ---
>   drivers/scsi/sd.c | 11 ++++++++++-
>   1 file changed, 10 insertions(+), 1 deletion(-)
> 
Reviewed-by: Hannes Reinecke <hare@...e.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                  Kernel Storage Architect
hare@...e.de                                +49 911 74053 688
SUSE Software Solutions GmbH, Frankenstr. 146, 90461 Nürnberg
HRB 36809 (AG Nürnberg), GF: I. Totev, A. McDonald, W. Knoblich