CVE-2023-52831 (GCVE-0-2023-52831)

Vulnerability from cvelistv5 – Published: 2024-05-21 15:31 – Updated: 2026-01-05 10:17
VLAI?
Title
cpu/hotplug: Don't offline the last non-isolated CPU
Summary
In the Linux kernel, the following vulnerability has been resolved: cpu/hotplug: Don't offline the last non-isolated CPU If a system has isolated CPUs via the "isolcpus=" command line parameter, then an attempt to offline the last housekeeping CPU will result in a WARN_ON() when rebuilding the scheduler domains and a subsequent panic due to and unhandled empty CPU mas in partition_sched_domains_locked(). cpuset_hotplug_workfn() rebuild_sched_domains_locked() ndoms = generate_sched_domains(&doms, &attr); cpumask_and(doms[0], top_cpuset.effective_cpus, housekeeping_cpumask(HK_FLAG_DOMAIN)); Thus results in an empty CPU mask which triggers the warning and then the subsequent crash: WARNING: CPU: 4 PID: 80 at kernel/sched/topology.c:2366 build_sched_domains+0x120c/0x1408 Call trace: build_sched_domains+0x120c/0x1408 partition_sched_domains_locked+0x234/0x880 rebuild_sched_domains_locked+0x37c/0x798 rebuild_sched_domains+0x30/0x58 cpuset_hotplug_workfn+0x2a8/0x930 Unable to handle kernel paging request at virtual address fffe80027ab37080 partition_sched_domains_locked+0x318/0x880 rebuild_sched_domains_locked+0x37c/0x798 Aside of the resulting crash, it does not make any sense to offline the last last housekeeping CPU. Prevent this by masking out the non-housekeeping CPUs when selecting a target CPU for initiating the CPU unplug operation via the work queue.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: fea9dd8653ff39ce383c54e747bde4c39289b4ad , < 3410b702354702b500bde10e3cc1f9db8731d908 (git)
Affected: 07f9e0c9987bf1c4ef57611ad2f789ba68978102 , < 335a47ed71e332c82339d1aec0c7f6caccfcda13 (git)
Affected: 2b8272ff4a70b866106ae13c36be7ecbef5d5da2 , < 3073f6df783d9d75f7f69f73e16c7ef85d6cfb63 (git)
Affected: 2b8272ff4a70b866106ae13c36be7ecbef5d5da2 , < 38685e2a0476127db766f81b1c06019ddc4c9ffa (git)
Affected: 9734e4c0c470258c32b6aa5ea7ef8a86506c0909 (git)
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    Linux Linux Affected: 6.6
Unaffected: 0 , < 6.6 (semver)
Unaffected: 6.1.64 , ≤ 6.1.* (semver)
Unaffected: 6.5.13 , ≤ 6.5.* (semver)
Unaffected: 6.6.3 , ≤ 6.6.* (semver)
Unaffected: 6.7 , ≤ * (original_commit_for_fix)
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