linux-kernel - Re: [PATCH 2/4] nvme: reject invalid pr_read_keys() num

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <c678bfcb-4872-4f3f-8aeb-3956c2e7a1c8@suse.de>
Date: Thu, 27 Nov 2025 08:02:27 +0100
From: Hannes Reinecke <hare@...e.de>
To: Stefan Hajnoczi <stefanha@...hat.com>, linux-block@...r.kernel.org
Cc: "Martin K. Petersen" <martin.petersen@...cle.com>,
 linux-kernel@...r.kernel.org,
 "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
 Mike Christie <michael.christie@...cle.com>, Jens Axboe <axboe@...nel.dk>,
 linux-nvme@...ts.infradead.org, Keith Busch <kbusch@...nel.org>,
 Sagi Grimberg <sagi@...mberg.me>, linux-scsi@...r.kernel.org,
 Christoph Hellwig <hch@....de>
Subject: Re: [PATCH 2/4] nvme: reject invalid pr_read_keys() num_keys values

On 11/26/25 17:35, Stefan Hajnoczi wrote:
> The pr_read_keys() interface has a u32 num_keys parameter. The NVMe
> Reservation Report command has a u32 maximum length. Reject num_keys
> values that are too large to fit.
> 
> 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/nvme/host/pr.c | 5 +++++
>   1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/nvme/host/pr.c b/drivers/nvme/host/pr.c
> index ca6a74607b139..476a0518a11ca 100644
> --- a/drivers/nvme/host/pr.c
> +++ b/drivers/nvme/host/pr.c
> @@ -233,6 +233,11 @@ static int nvme_pr_read_keys(struct block_device *bdev,
>   	int ret, i;
>   	bool eds;
>   
> +	/* Check that keys fit into u32 rse_len */
> +	if (num_keys > -(u32)offsetof(typeof(*rse), regctl_eds) /
> +	               sizeof(rse->regctl_eds[0]))
> +		return -EINVAL;
> +
>   	/*
>   	 * Assume we are using 128-bit host IDs and allocate a buffer large
>   	 * enough to get enough keys to fill the return keys buffer.

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