From: no-reply@sashiko.virtuozzo.com
To: "Denis V. Lunev" <den@openvz.org>, andrey.drobyshev@virtuozzo.com
Cc: svt-core@virtuozzo.com, den@openvz.org
Subject: Re: [PATCH hci-8.1 2/3] hw/usb/hcd-xhci: Limit DMA transfers to plain memory #VSTOR-151666
Date: Mon, 26 Oct 2026 11:50:08 +0000 [thread overview]
Message-ID: <010701a1780be6f6-575846a9-3612-4483-87a3-d7cda7d337dd-000000@eu-central-1.amazonses.com> (raw)
In-Reply-To: <20261026114645.187003-3-den@openvz.org>
> From: Thomas Huth <thuth@redhat.com>
>
> XHCI is a complex controller, involving lots of descriptors that
> are written and read via DMA transfers. As some recent bugs like
> https://gitlab.com/qemu-project/qemu/-/work_items/3926 revealed,
> this can sometimes be exploited from the guest side to crash or
> stall QEMU.
>
> The code currently does DMA writes with the MEMTXATTRS_UNSPECIFIED
> attribute, i.e. the controller is allowed to write to other MMIO
> regions, too. However, in normal operation, this should not be
> necessary, all descriptors should reside in normal memory. So let's
> decrease the attack surface a little bit and limit the DMA writes
> to normal memory here.
>
> Signed-off-by: Thomas Huth <thuth@redhat.com>
Sashiko has reviewed this patch and found no issues. It looks great!
--
Sashiko AI review · https://sashiko.vzint.dev/#/patchset/20261026114645.187003-1-den@openvz.org?part=2
next prev parent reply other threads:[~2026-10-26 11:50 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-26 11:46 [PATCH hci-8.1 0/3] hw/usb/hcd-xhci: fix guest-triggerable use-after-free (CVE-2026-17588, CVE-2026-111819) #VSTOR-151666 Denis V. Lunev
2026-10-26 11:46 ` [PATCH hci-8.1 1/3] hw/usb/hcd-xhci: Set reentrancy guard in timer functions (CVE-2026-17588) #VSTOR-151666 Denis V. Lunev
2026-10-26 11:51 ` no-reply
2026-10-26 11:46 ` [PATCH hci-8.1 2/3] hw/usb/hcd-xhci: Limit DMA transfers to plain memory #VSTOR-151666 Denis V. Lunev
2026-10-26 11:50 ` no-reply [this message]
2026-10-26 11:46 ` [PATCH hci-8.1 3/3] hw/usb/hcd-xhci: More reentrancy guard fixes for the XHCI code #VSTOR-151666 Denis V. Lunev
2026-10-26 11:53 ` no-reply
2026-10-26 16:13 ` [PATCH hci-8.1 0/3] hw/usb/hcd-xhci: fix guest-triggerable use-after-free (CVE-2026-17588, CVE-2026-111819) #VSTOR-151666 Andrey Drobyshev
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