CVE - CVE-2024-49866

CVE-ID
CVE-2024-49866	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: Fix a race during cpuhp processing There is another found exception that the "timerlat/1" thread was scheduled on CPU0, and lead to timer corruption finally: ``` ODEBUG: init active (active state 0) object: ffff888237c2e108 object type: hrtimer hint: timerlat_irq+0x0/0x220 WARNING: CPU: 0 PID: 426 at lib/debugobjects.c:518 debug_print_object+0x7d/0xb0 Modules linked in: CPU: 0 UID: 0 PID: 426 Comm: timerlat/1 Not tainted 6.11.0-rc7+ #45 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:debug_print_object+0x7d/0xb0 ... Call Trace: <TASK> ? __warn+0x7c/0x110 ? debug_print_object+0x7d/0xb0 ? report_bug+0xf1/0x1d0 ? prb_read_valid+0x17/0x20 ? handle_bug+0x3f/0x70 ? exc_invalid_op+0x13/0x60 ? asm_exc_invalid_op+0x16/0x20 ? debug_print_object+0x7d/0xb0 ? debug_print_object+0x7d/0xb0 ? __pfx_timerlat_irq+0x10/0x10 __debug_object_init+0x110/0x150 hrtimer_init+0x1d/0x60 timerlat_main+0xab/0x2d0 ? __pfx_timerlat_main+0x10/0x10 kthread+0xb7/0xe0 ? __pfx_kthread+0x10/0x10 ret_from_fork+0x2d/0x40 ? __pfx_kthread+0x10/0x10 ret_from_fork_asm+0x1a/0x30 </TASK> ``` After tracing the scheduling event, it was discovered that the migration of the "timerlat/1" thread was performed during thread creation. Further analysis confirmed that it is because the CPU online processing for osnoise is implemented through workers, which is asynchronous with the offline processing. When the worker was scheduled to create a thread, the CPU may has already been removed from the cpu_online_mask during the offline process, resulting in the inability to select the right CPU: T1 \| T2 [CPUHP_ONLINE] \| cpu_device_down() osnoise_hotplug_workfn() \| \| cpus_write_lock() \| takedown_cpu(1) \| cpus_write_unlock() [CPUHP_OFFLINE] \| cpus_read_lock() \| start_kthread(1) \| cpus_read_unlock() \| To fix this, skip online processing if the CPU is already offline.
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/322920b53dc11f9c2b33397eb3ae5bc6a175b60d URL:https://git.kernel.org/stable/c/322920b53dc11f9c2b33397eb3ae5bc6a175b60d MISC:https://git.kernel.org/stable/c/829e0c9f0855f26b3ae830d17b24aec103f7e915 URL:https://git.kernel.org/stable/c/829e0c9f0855f26b3ae830d17b24aec103f7e915 MISC:https://git.kernel.org/stable/c/a0d9c0cd5856191e095cf43a2e141b73945b7716 URL:https://git.kernel.org/stable/c/a0d9c0cd5856191e095cf43a2e141b73945b7716 MISC:https://git.kernel.org/stable/c/a6e9849063a6c8f4cb2f652a437e44e3ed24356c URL:https://git.kernel.org/stable/c/a6e9849063a6c8f4cb2f652a437e44e3ed24356c MISC:https://git.kernel.org/stable/c/ce25f33ba89d6eefef64157655d318444580fa14 URL:https://git.kernel.org/stable/c/ce25f33ba89d6eefef64157655d318444580fa14 MISC:https://git.kernel.org/stable/c/f72b451dc75578f644a3019c1489e9ae2c14e6c4 URL:https://git.kernel.org/stable/c/f72b451dc75578f644a3019c1489e9ae2c14e6c4
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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