[release-24.11] xen: manual backport of XSAs #467 & #469#407311
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LeSuisse merged 2 commits intoNixOS:release-24.11from May 16, 2025
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[release-24.11] xen: manual backport of XSAs #467 & #469#407311LeSuisse merged 2 commits intoNixOS:release-24.11from
LeSuisse merged 2 commits intoNixOS:release-24.11from
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When setting up interrupt remapping for legacy PCI(-X) devices,
including PCI(-X) bridges, a lookup of the upstream bridge is required.
This lookup, itself involving acquiring of a lock, is done in a context
where acquiring that lock is unsafe. This can lead to a deadlock.
The passing through of certain kinds of devices to an unprivileged guest
can result in a Denial of Service (DoS) affecting the entire host.
Note: Normal usage of such devices by a privileged domain can also
trigger the issue. In such a scenario, the deadlock is not
considered a security issue, but just a plain bug.
Systems with Intel IOMMU hardware (VT-d) are affected. Systems using
AMD or non-x86 hardware are not affected.
Only systems where certain kinds of devices are passed through to an
unprivileged guest are vulnerable.
Signed-off-by: Fernando Rodrigues <alpha@sigmasquadron.net>
(cherry picked from commit 5af1d19)
Researchers at VU Amsterdam have released Training Solo, detailing several speculative attacks which bypass current protections. One issue, which Intel has named Indirect Target Selection, is a bug in the hardware support for prediction-domain isolation. The mitigation for this involves both microcode and software changes in Xen. For more details, see: 1. https://vusec.net/projects/training-solo 2. https://www.intel.com/content/www/us/en/developer/articles/technical/software-security-guidance/advisory-guidance/indirect-target-selection.html Another issue discussed in the Training Solo paper pertains to classic-BPF. Xen does not have any capability similar to BPF filters, so is not believed to be affected by this issue. Signed-off-by: Fernando Rodrigues <alpha@sigmasquadron.net> (cherry picked from commit c29710d)
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Confirmed nixpkgs-review builds, let's merge. |
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Manual backport of #385642 and #406506.
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