CVE-2024-50249

Summary

In the Linux kernel, the following vulnerability has been resolved:

ACPI: CPPC: Make rmw_lock a raw_spin_lock

The following BUG was triggered:

============================= [ BUG: Invalid wait context ] 6.12.0-rc2-XXX #406 Not tainted

kworker/1:1/62 is trying to lock: ffffff8801593030 (&cpc_ptr->rmw_lock){+.+.}-{3:3}, at: cpc_write+0xcc/0x370 other info that might help us debug this: context-{5:5} 2 locks held by kworker/1:1/62: #0: ffffff897ef5ec98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2c/0x50 #1: ffffff880154e238 (&sg_policy->update_lock){….}-{2:2}, at: sugov_update_shared+0x3c/0x280 stack backtrace: CPU: 1 UID: 0 PID: 62 Comm: kworker/1:1 Not tainted 6.12.0-rc2-g9654bd3e8806 #406 Workqueue: 0x0 (events) Call trace: dump_backtrace+0xa4/0x130 show_stack+0x20/0x38 dump_stack_lvl+0x90/0xd0 dump_stack+0x18/0x28 __lock_acquire+0x480/0x1ad8 lock_acquire+0x114/0x310 _raw_spin_lock+0x50/0x70 cpc_write+0xcc/0x370 cppc_set_perf+0xa0/0x3a8 cppc_cpufreq_fast_switch+0x40/0xc0 cpufreq_driver_fast_switch+0x4c/0x218 sugov_update_shared+0x234/0x280 update_load_avg+0x6ec/0x7b8 dequeue_entities+0x108/0x830 dequeue_task_fair+0x58/0x408 __schedule+0x4f0/0x1070 schedule+0x54/0x130 worker_thread+0xc0/0x2e8 kthread+0x130/0x148 ret_from_fork+0x10/0x20

sugov_update_shared() locks a raw_spinlock while cpc_write() locks a spinlock.

To have a correct wait-type order, update rmw_lock to a raw spinlock and ensure that interrupts will be disabled on the CPU holding it.

[ rjw: Changelog edits ]

Affected Software

VendorProductVersion RangeStatus
LinuxLinux94e8c988468dafde1d2bfe0532a60a3117f6394b < c46d6b02588000c27b7b869388c2c0278bd0d173affected
LinuxLinuxf812ca13a0d3e3aa418da36b66ca40df0d6f9e60 < 23039b4aaf1e82e0feea1060834d4ec34262e453affected
LinuxLinux8ad28208be7bbe748e90442c45963ddbef0fd1e2 < 0eb2b767c42fac61ab23c4063eb456baa4c2c262affected
LinuxLinux20cde05aa8bcd7a5ff36a609d813189b7cdbe692 < 43b1df48d1e7000a214acd1a81b8012ca8a929c8affected
LinuxLinux60949b7b805424f21326b450ca4f1806c06d982e < 1c10941e34c5fdc0357e46a25bd130d9cf40b925affected
LinuxLinux82cee12ada68dfd438c7faca152dbfe042868743affected
LinuxLinux6.10.13 < 6.11affected
LinuxLinux5.15.168 < 5.15.171affected
LinuxLinux6.1.113 < 6.1.116affected
LinuxLinux6.6.54 < 6.6.60affected
LinuxLinux6.11.2 < 6.11.7affected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

References