arm: guest_physmap_remove_page not removing the p2m mappings The functions to remove one or more entries from a guest p2m pagetable on Arm (p2m_remove_mapping, guest_physmap_remove_page, and p2m_set_entry with mfn set to INVALID_MFN) do not actually clear the pagetable entry if the entry doesn't have the valid bit set. It is possible to have a valid pagetable entry without the valid bit set when a guest operating system uses set/way cache maintenance instructions. For instance, a guest issuing a set/way cache maintenance instruction, then calling the XENMEM_decrease_reservation hypercall to give back memory pages to Xen, might be able to retain access to those pages even after Xen started reusing them for other purposes.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade xen | Mar 26, 2024 | Jan 25, 2022 |
| Debian | — | Upgrade xen | Nov 4, 2022 | Jan 25, 2022 |
| Gentoo Linux | — | Upgrade app-emulation/xen.Upgrade app-emulation/xen-tools. | Aug 16, 2022 | Jan 25, 2022 |
| Suse | — | Upgrade xenUpgrade xen-toolsUpgrade xen-tools-xendomains-wait-diskUpgrade xen-develUpgrade xen-tools-domUUpgrade xen-libs-32bitUpgrade xen-libsUpgrade xen-doc-html | Feb 5, 2022 | Jan 25, 2022 |
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