CVE-2023-52932
mm/swapfile: add cond_resched() in get_swap_pages()
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Description
In the Linux kernel, the following vulnerability has been resolved: mm/swapfile: add cond_resched() in get_swap_pages() The softlockup still occurs in get_swap_pages() under memory pressure. 64 CPU cores, 64GB memory, and 28 zram devices, the disksize of each zram device is 50MB with same priority as si. Use the stress-ng tool to increase memory pressure, causing the system to oom frequently. The plist_for_each_entry_safe() loops in get_swap_pages() could reach tens of thousands of times to find available space (extreme case: cond_resched() is not called in scan_swap_map_slots()). Let's add cond_resched() into get_swap_pages() when failed to find available space to avoid softlockup.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
- https://git.kernel.org/stable/c/29f0349c5c76b627fe06b87d4b13fa03a6ce8e64
- https://git.kernel.org/stable/c/30187be29052bba9203b0ae2bdd815e0bc2faaab
- https://git.kernel.org/stable/c/387217b97e99699c34e6d95ce2b91b327fcd853e
- https://git.kernel.org/stable/c/49178d4d61e78aed8c837dfeea8a450700f196e2
- https://git.kernel.org/stable/c/5dbe1ebd56470d03b78fc31491a9e4d433106ef2
References (7)
SSVC — Action Prioritization
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
- Attack Vector
- LOCAL
- Complexity
- LOW
- Privileges
- LOW
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- NONE
- Integrity
- NONE
- Availability
- HIGH
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