CVE - CVE-2024-49976

CVE-ID
CVE-2024-49976	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/09cb44cc3d3df7ade2cebc939d6257a2fa8afc7a URL:https://git.kernel.org/stable/c/09cb44cc3d3df7ade2cebc939d6257a2fa8afc7a MISC:https://git.kernel.org/stable/c/a4a05ceffe8fad68b45de38fe2311bda619e76e2 URL:https://git.kernel.org/stable/c/a4a05ceffe8fad68b45de38fe2311bda619e76e2 MISC:https://git.kernel.org/stable/c/b484a02c9cedf8703eff8f0756f94618004bd165 URL:https://git.kernel.org/stable/c/b484a02c9cedf8703eff8f0756f94618004bd165 MISC:https://git.kernel.org/stable/c/db8571a9a098086608c11a15856ff585789e67e8 URL:https://git.kernel.org/stable/c/db8571a9a098086608c11a15856ff585789e67e8
Assigning CNA
kernel.org
Date Record Created
20241021	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20241021)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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