Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: sched/psi: Shut down rtpoll_timer in psi_cgroup_free() psi_schedule_rtpoll_work() is called locklessly from the scheduler hotpath and can race psi_trigger_destroy() taking down the last rtpoll trigger under rtpoll_trigger_lock: psi_schedule_rtpoll_work() psi_trigger_destroy() rcu_read_lock(); task = rcu_dereference(rtpoll_task); rcu_assign_pointer(rtpoll_task, NULL); timer_delete(&rtpoll_timer); mod_timer(&rtpoll_timer, ...); rcu_read_unlock(); synchronize_rcu(); kthread_stop(task_to_destroy); The group can then be freed with the re-armed timer still pending, and poll_timer_fn() runs on freed memory. 461daba06bdc ("psi: eliminate kthread_worker from psi trigger scheduling mechanism") deleted the timer synchronously after the synchronize_rcu(), which prevented this but raced trigger creation instead: the deletion could cancel the timer that a new trigger set armed during the grace period and, as creation also reinitialized the timer at the time, corrupt it. 8f91efd870ea ("psi: Fix race between psi_trigger_create/destroy") moved the initialization into group_init() and the deletion into the locked section, trading the creation races for the window above. Neither placement in the destruction path works. A pending timer firing while the group is alive is harmless though. poll_timer_fn() just wakes the rtpoll waitqueue and doesn't re-arm itself. Bind the timer to the group's lifetime instead and shut it down in psi_cgroup_free(). Nothing can arm it by then. timer_shutdown_sync() because the timer is never armed again.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 6bfcb6178925b1fd28c102e53d403091b8f49396 before 4addb102154b7cf6e2310ccbe20c3c08619e520d; affected 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 before 894a9300d7fb2e2951da92e565ae6de7ddfb0a69; affected 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 before 1e5ca82eee59caca6988f9d6e859786aab8a5fa0; affected 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 before 310b5a537a78c358a4cd244bd767c1a517a05459; affected 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 before 806fcff98c1d7cb3c1dc0015e55ebdbe819e6b08; affected 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 before 8037c5b2b2a447df52542f4d8535895d837bdcbd; affected 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 before 611e7821c4f83a671455658797336faecc3a5196; affected 8f91efd870ea5d8bc10b0fcc9740db51cd4c0c83 before 5457025fa8ca3c0d2732109513de839e3e797190; affected e1e5e263bbe0e6e9c3db36aa48a3c8acf546fa49; affected 979965c33f734a1666af67900408f997ac669c23; affected 5.10.50 before 5.10.266; affected 5.12.17 before 5.13; affected 5.13.2 before 5.14 |
| Linux / Linux | affected 5.14; unaffected 0 before 5.14; unaffected 5.10.266 through 5.10.*; unaffected 5.15.217 through 5.15.*; unaffected 6.1.183 through 6.1.*; unaffected 6.6.152 through 6.6.*; unaffected 6.12.104 through 6.12.*; unaffected 6.18.45 through 6.18.*; unaffected 7.1.9 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/4addb102154b7cf6e2310ccbe20c3c08619e520d
- https://git.kernel.org/stable/c/894a9300d7fb2e2951da92e565ae6de7ddfb0a69
- https://git.kernel.org/stable/c/1e5ca82eee59caca6988f9d6e859786aab8a5fa0
- https://git.kernel.org/stable/c/310b5a537a78c358a4cd244bd767c1a517a05459
- https://git.kernel.org/stable/c/806fcff98c1d7cb3c1dc0015e55ebdbe819e6b08
- https://git.kernel.org/stable/c/8037c5b2b2a447df52542f4d8535895d837bdcbd
- https://git.kernel.org/stable/c/611e7821c4f83a671455658797336faecc3a5196
- https://git.kernel.org/stable/c/5457025fa8ca3c0d2732109513de839e3e797190
ADP enrichment
No English description supplied.
No references supplied.