cve-2024-49976
Vulnerability from cvelistv5
Published
2024-10-21 18:02
Modified
2024-12-19 09:30
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: tracing/timerlat: Drop interface_lock in stop_kthread() stop_kthread() is the offline callback for "trace/osnoise:online", since commit 5bfbcd1ee57b ("tracing/timerlat: Add interface_lock around clearing of kthread in stop_kthread()"), the following ABBA deadlock scenario is introduced: T1 | T2 [BP] | T3 [AP] osnoise_hotplug_workfn() | work_for_cpu_fn() | cpuhp_thread_fun() | _cpu_down() | osnoise_cpu_die() mutex_lock(&interface_lock) | | stop_kthread() | cpus_write_lock() | mutex_lock(&interface_lock) cpus_read_lock() | cpuhp_kick_ap() | As the interface_lock here in just for protecting the "kthread" field of the osn_var, use xchg() instead to fix this issue. Also use for_each_online_cpu() back in stop_per_cpu_kthreads() as it can take cpu_read_lock() again.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/09cb44cc3d3df7ade2cebc939d6257a2fa8afc7aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a4a05ceffe8fad68b45de38fe2311bda619e76e2Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b484a02c9cedf8703eff8f0756f94618004bd165Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/db8571a9a098086608c11a15856ff585789e67e8Patch
Impacted products
Vendor Product Version
Linux Linux Version: b4fdabffae14cca2c80d99bd81f3f27239ac7f5e
Version: 4679272d5252720746fd9c5465352cbc5665f230
Version: 5bfbcd1ee57b607fd29e4645c7f350dd385dd9ad
Version: 5bfbcd1ee57b607fd29e4645c7f350dd385dd9ad
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   Linux Linux Version: 6.11
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