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From: Dinh Nguyen <dinguyen@kernel.org>
To: Abdifatah Suruur <suruurism@gmail.com>, linux-fpga@vger.kernel.org
Cc: linux-kernel@vger.kernel.org, yilun.xu@intel.com, trix@redhat.com
Subject: Re: [PATCH] fpga: dfl: afu: prevent read-only port mappings from becoming writable
Date: Wed, 19 Aug 2026 06:23:21 -0500	[thread overview]
Message-ID: <7d5b8ce3-2f07-434b-afcf-927214959730@kernel.org> (raw)
In-Reply-To: <20260819084213.1560-1-suruurism@gmail.com>



On 8/19/26 03:42, Abdifatah Suruur wrote:
> afu_mmap() rejects writable mappings of port regions without the WRITE
> flag, but leaves VM_MAYWRITE set.  Userspace can map such a region
> read-only and then upgrade the mapping to writable with mprotect(),
> writing to FPGA port control/status registers the host owns.  A guest
> assigned an AFU can use this to reconfigure or reset the port and
> interfere with other tenants on the same FPGA.
> 
> Clear VM_MAYWRITE for regions without the WRITE flag, as i915 does for
> its read-only objects and as fixed in drm/vc4 (CVE-2026-68445) and
> drm/panthor (CVE-2024-53071) and ptp: vmclock (commit
> a5edadbae57e2298a56cf7a4e774a027905a331f).
> 
> Fixes: 1a1527cf5ddac ("fpga: dfl: add FPGA Accelerated Function Unit driver basic framework")

Please used exactly 12 characters for the hash ID.

Dinh

  reply	other threads:[~2026-08-19 11:23 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-08-19  8:42 [PATCH] fpga: dfl: afu: prevent read-only port mappings from becoming writable Abdifatah Suruur
2026-08-19 11:23 ` Dinh Nguyen [this message]
  -- strict thread matches above, loose matches on Subject: below --
2026-08-19  8:39 Abdifatah Suruur

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