linux-kernel - Re: [PATCH 1/1] iommu/vt-d: debugfs: Avoid dumping context command register

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] [day] [month] [year] [list]

Message-ID: <7c211a7a-c68d-41c6-8f1b-76af74a3def6@linux.intel.com>
Date: Thu, 18 Sep 2025 12:37:11 +0800
From: Baolu Lu <baolu.lu@...ux.intel.com>
To: Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
 Robin Murphy <robin.murphy@....com>, Kevin Tian <kevin.tian@...el.com>
Cc: iommu@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] iommu/vt-d: debugfs: Avoid dumping context command
 register

On 9/17/25 10:50, Lu Baolu wrote:
> The register-based cache invalidation interface is in the process of being
> replaced by the queued invalidation interface. The VT-d architecture
> allows hardware implementations with a queued invalidation interface to
> not implement the registers used for cache invalidation. Currently, the
> debugfs interface dumps the Context Command Register unconditionally,
> which is not reasonable.
> 
> Remove it to avoid potential access tonon-present registers.
> 
> Signed-off-by: Lu Baolu<baolu.lu@...ux.intel.com>
> ---
>   drivers/iommu/intel/debugfs.c | 1 -
>   1 file changed, 1 deletion(-)

Queued for v6.18.