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Home CVE Database CVE-2024-38613



In the Linux kernel, the following vulnerability has been resolved: m68k: Fix spinlock race in kernel thread creation Context switching does take care to retain the correct lock owner across the switch from \'prev\' to \'next\' tasks. This does rely on interrupts remaining disabled for the entire duration of the switch. This condition is guaranteed for normal process creation and context switching between already running processes, because both \'prev\' and \'next\' already have interrupts disabled in their saved copies of the status register. The situation is different for newly created kernel threads. The status register is set to PS_S in copy_thread(), which does leave the IPL at 0. Upon restoring the \'next\' thread\'s status register in switch_to() aka resume(), interrupts then become enabled prematurely. resume() then returns via ret_from_kernel_thread() and schedule_tail() where run queue lock is released (see finish_task_switch() and finish_lock_switch()). A timer interrupt calling scheduler_tick() before the lock is released in finish_task_switch() will find the lock already taken, with the current task as lock owner. This causes a spinlock recursion warning as reported by Guenter Roeck. As far as I can ascertain, this race has been opened in commit 533e6903bea0 (m68k: split ret_from_fork(), simplify kernel_thread()) but I haven\'t done a detailed study of kernel history so it may well predate that commit. Interrupts cannot be disabled in the saved status register copy for kernel threads (init will complain about interrupts disabled when finally starting user space). Disable interrupts temporarily when switching the tasks\' register sets in resume(). Note that a simple oriw 0x700,%sr after restoring sr is not enough here - this leaves enough of a race for the \'spinlock recursion\' warning to still be observed. Tested on ARAnyM and qemu (Quadra 800 emulation).

Priority: --
CVSS v3: --
Component: linux
Publish Date: Jun 19, 2024
Related ID: --
CVSS v2: --
Modified Date: Jun 20, 2024

Find out more about CVE-2024-38613 from the MITRE-CVE dictionary and NIST NVD

Products Affected

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Product Name Status Defect Fixed Downloads
Wind River Linux LTS 17 Requires LTSS -- -- --
Wind River Linux 8 Requires LTSS -- -- --
Wind River Linux 9 Requires LTSS -- -- --
Wind River Linux 7 Requires LTSS -- -- --
Wind River Linux LTS 21 Investigate -- -- --
Wind River Linux LTS 22 Fixed LIN1022-9407 --
Wind River Linux LTS 18 Requires LTSS -- -- --
Wind River Linux LTS 19 Investigate -- -- --
Wind River Linux CD release N/A -- -- --
Wind River Linux 6 Requires LTSS -- -- --
Wind River Linux LTS 23 Fixed LIN1023-6697 --
VxWorks 7 Not Vulnerable -- -- --
VxWorks 6.9 Not Vulnerable -- -- --
Helix Virtualization Platform Cert Edition
Helix Virtualization Platform Cert Edition Not Vulnerable -- -- --
eLxr 12 Vulnerable -- -- --

Related Products

Product Name Status Defect Fixed Downloads

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