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.
Metrics
Affected Vendors & Products
References
History
Wed, 23 Oct 2024 17:00:00 +0000
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First Time appeared |
Linux
Linux linux Kernel |
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Weaknesses | CWE-835 | |
CPEs | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
Vendors & Products |
Linux
Linux linux Kernel |
Tue, 22 Oct 2024 01:30:00 +0000
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References |
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Metrics |
threat_severity
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cvssV3_1
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Mon, 21 Oct 2024 13:15:00 +0000
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Metrics |
ssvc
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Mon, 21 Oct 2024 12:30:00 +0000
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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. | |
Title | x86/sgx: Fix deadlock in SGX NUMA node search | |
References |
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MITRE
Status: PUBLISHED
Assigner: Linux
Published: 2024-10-21T12:18:48.123Z
Updated: 2024-12-19T09:27:39.313Z
Reserved: 2024-10-21T12:17:06.016Z
Link: CVE-2024-49856
Vulnrichment
Updated: 2024-10-21T12:56:20.359Z
NVD
Status : Analyzed
Published: 2024-10-21T13:15:06.353
Modified: 2024-10-23T16:33:20.857
Link: CVE-2024-49856
Redhat