Description
In the Linux kernel, the following vulnerability has been resolved: soc: qcom: cmd-db: Map shared memory as WC, not WB Linux does not write into cmd-db region. This region of memory is write protected by XPU. XPU may sometime falsely detect clean cache eviction as "write" into the write protected region leading to secure interrupt which causes an endless loop somewhere in Trust Zone. The only reason it is working right now is because Qualcomm Hypervisor maps the same region as Non-Cacheable memory in Stage 2 translation tables. The issue manifests if we want to use another hypervisor (like Xen or KVM), which does not know anything about those specific mappings. Changing the mapping of cmd-db memory from MEMREMAP_WB to MEMREMAP_WT/WC removes dependency on correct mappings in Stage 2 tables. This patch fixes the issue by updating the mapping to MEMREMAP_WC. I tested this on SA8155P with Xen.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
312416d9171a1460b7ed8d182b5b540c910ce80d to < 0ee9594c974368a17e85a431e9fe1c14fb65c278affected312416d9171a1460b7ed8d182b5b540c910ce80d to < f5a5a5a0e95f36e2792d48e6e4b64e665eb01374affected312416d9171a1460b7ed8d182b5b540c910ce80d to < eaff392c1e34fb77cc61505a31b0191e5e46e271affected312416d9171a1460b7ed8d182b5b540c910ce80d to < d9d48d70e922b272875cda60d2ada89291c840cfaffected312416d9171a1460b7ed8d182b5b540c910ce80d to < ef80520be0ff78ae5ed44cb6eee1525e65bebe70affected312416d9171a1460b7ed8d182b5b540c910ce80d to < 62c2d63605ca25b5db78a347ed303c0a0a77d5b4affected312416d9171a1460b7ed8d182b5b540c910ce80d to < f9bb896eab221618927ae6a2f1d566567999839daffected
Linux Linux
Default version status: affected
4.18affected0 to < 4.18unaffected5.4.283 to ≤ 5.4.*unaffected5.10.225 to ≤ 5.10.*unaffected5.15.166 to ≤ 5.15.*unaffected6.1.108 to ≤ 6.1.*unaffected6.6.49 to ≤ 6.6.*unaffected6.10.8 to ≤ 6.10.*unaffected6.11 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/0ee9594c974368a17e85a431e9fe1c14fb65c278 ↗
- https://git.kernel.org/stable/c/f5a5a5a0e95f36e2792d48e6e4b64e665eb01374 ↗
- https://git.kernel.org/stable/c/eaff392c1e34fb77cc61505a31b0191e5e46e271 ↗
- https://git.kernel.org/stable/c/d9d48d70e922b272875cda60d2ada89291c840cf ↗
- https://git.kernel.org/stable/c/ef80520be0ff78ae5ed44cb6eee1525e65bebe70 ↗
- https://git.kernel.org/stable/c/62c2d63605ca25b5db78a347ed303c0a0a77d5b4 ↗
- https://git.kernel.org/stable/c/f9bb896eab221618927ae6a2f1d566567999839d ↗
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html ↗
- https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html ↗