Description
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.
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
b4fdabffae14cca2c80d99bd81f3f27239ac7f5e to < a4a05ceffe8fad68b45de38fe2311bda619e76e2affected4679272d5252720746fd9c5465352cbc5665f230 to < 09cb44cc3d3df7ade2cebc939d6257a2fa8afc7aaffected5bfbcd1ee57b607fd29e4645c7f350dd385dd9ad to < db8571a9a098086608c11a15856ff585789e67e8affected5bfbcd1ee57b607fd29e4645c7f350dd385dd9ad to < b484a02c9cedf8703eff8f0756f94618004bd165affected6.6.51 to < 6.6.55affected6.10.10 to < 6.10.14affected
Linux Linux
Default version status: affected
6.11affected0 to < 6.11unaffected6.6.55 to ≤ 6.6.*unaffected6.10.14 to ≤ 6.10.*unaffected6.11.3 to ≤ 6.11.*unaffected6.12 to ≤ *unaffected