Description
In the Linux kernel, the following vulnerability has been resolved: x86/sgx: Fix deadlock in SGX NUMA node search When the current node doesn't have an EPC section configured by firmware and all other EPC sections are used up, CPU can get stuck inside the while loop that looks for an available EPC page from remote nodes indefinitely, leading to a soft lockup. Note how nid_of_current will never be equal to nid in that while loop because nid_of_current is not set in sgx_numa_mask. Also worth mentioning is that it's perfectly fine for the firmware not to setup an EPC section on a node. While setting up an EPC section on each node can enhance performance, it is not a requirement for functionality. Rework the loop to start and end on *a* node that has SGX memory. This avoids the deadlock looking for the current SGX-lacking node to show up in the loop when it never will.
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
901ddbb9ecf5425183ea0c09d10c2fd7868dce54 to < 40fb64257dab507d86b5f1f2a62f3669ef0c91a8affected901ddbb9ecf5425183ea0c09d10c2fd7868dce54 to < 20c96d0aaabfe361fc2a11c173968dc67feadbbfaffected901ddbb9ecf5425183ea0c09d10c2fd7868dce54 to < fb2d057539eda67ec7cfc369bf587e6518a9b99daffected901ddbb9ecf5425183ea0c09d10c2fd7868dce54 to < 0f89fb4042c08fd143bfc28af08bf6c8a0197eeaaffected901ddbb9ecf5425183ea0c09d10c2fd7868dce54 to < 8132510c915815e6b537ab937d94ed66893bc7b8affected901ddbb9ecf5425183ea0c09d10c2fd7868dce54 to < 9c936844010466535bd46ea4ce4656ef17653644affected
Linux Linux
Default version status: affected
5.13affected0 to < 5.13unaffected5.15.168 to ≤ 5.15.*unaffected6.1.113 to ≤ 6.1.*unaffected6.6.54 to ≤ 6.6.*unaffected6.10.13 to ≤ 6.10.*unaffected6.11.2 to ≤ 6.11.*unaffected6.12 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/40fb64257dab507d86b5f1f2a62f3669ef0c91a8 ↗
- https://git.kernel.org/stable/c/20c96d0aaabfe361fc2a11c173968dc67feadbbf ↗
- https://git.kernel.org/stable/c/fb2d057539eda67ec7cfc369bf587e6518a9b99d ↗
- https://git.kernel.org/stable/c/0f89fb4042c08fd143bfc28af08bf6c8a0197eea ↗
- https://git.kernel.org/stable/c/8132510c915815e6b537ab937d94ed66893bc7b8 ↗
- https://git.kernel.org/stable/c/9c936844010466535bd46ea4ce4656ef17653644 ↗
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html ↗