linux-kernel - Re: kernel NULL pointer dereference in quirk_clear_strap_no_soft_reset_dev2_f0 -> amd_smn

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: <aYacFOY-u_PDtagq@mail-itl>
Date: Sat, 7 Feb 2026 02:57:40 +0100
From: Marek Marczykowski-Górecki <marmarek@...isiblethingslab.com>
To: Yazen Ghannam <yazen.ghannam@....com>
Cc: Mario Limonciello <mario.limonciello@....com>,
	"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
	"open list:AMD NODE DRIVER" <linux-kernel@...r.kernel.org>,
	regressions@...ts.linux.dev
Subject: Re: kernel NULL pointer dereference in
 quirk_clear_strap_no_soft_reset_dev2_f0 -> amd_smn_read

On Fri, Jan 30, 2026 at 12:01:06PM -0500, Yazen Ghannam wrote:
> On Tue, Jan 13, 2026 at 02:01:34AM +0100, Marek Marczykowski-Górecki wrote:
> > Hi,
> > 
> > I've got a report that kernel 6.17.9 crashes when running a Xen HVM domU
> > with AMD Raphael/Granite Ridge USB controller passed through.
> > It worked correctly in 6.12.59. Between those versions, I don't see any
> > relevant change to quirk_clear_strap_no_soft_reset_dev2_f0() function,
> > but the AMD node driver did got some changes, so my guess is one of them
> > is to blame. I know the good-bad range is huge, but there aren't that
> > many changes to the AMD node driver in this range.
> > 
> > It's running on Qubes OS 4.3, which uses Xen 4.19, and does PCI
> > passthrough of USB controllers to a dedicated VM (HVM).
> > 
> 
> Hi Marek,
> 
> Can you please test with the following patch?
> adbf61cc47cb ("x86/acpi/boot: Correct acpi_is_processor_usable() check again")
> 
> This is in the TIP maintainers repo and linux-next.

FWIW I asked[1] a week ago the original reporter to test this, but
unfortunately no feedback so far.

[1] https://forum.qubes-os.org/t/yet-another-usb-keyboard-thread/38355/20

-- 
Best Regards,
Marek Marczykowski-Górecki
Invisible Things Lab

Download attachment "signature.asc" of type "application/pgp-signature" (489 bytes)