Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: srcu: Use irq_work to start GP in tiny SRCU Tiny SRCU's srcu_gp_start_if_needed() directly calls schedule_work(), which acquires the workqueue pool->lock. This causes a lockdep splat when call_srcu() is called with a scheduler lock held, due to: call_srcu() [holding pi_lock] srcu_gp_start_if_needed() schedule_work() -> pool->lock workqueue_init() / create_worker() [holding pool->lock] wake_up_process() -> try_to_wake_up() -> pi_lock Also add irq_work_sync() to cleanup_srcu_struct() to prevent a use-after-free if a queued irq_work fires after cleanup begins. Tested with rcutorture SRCU-T and no lockdep warnings. [ Thanks to Boqun for similar fix in patch "rcu: Use an intermediate irq_work to start process_srcu()" ]
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected d8be81735aa89413b333de488251f0e64e2be591 before 20b98d9ffb09763048a7c84b47403eb0f177272c; affected d8be81735aa89413b333de488251f0e64e2be591 before 2127e6b79d9d579ea538a350d1bbe859e39814d5; affected d8be81735aa89413b333de488251f0e64e2be591 before 28768bc7ea0b13f558a70f63cc3cfcd32d55d488; affected d8be81735aa89413b333de488251f0e64e2be591 before bb37286db65368cb72ba8757ad86299c4e4a73fc; affected d8be81735aa89413b333de488251f0e64e2be591 before a6fc88b22bc8d12ad52e8412c667ec0f5bf055af |
| Linux / Linux | affected 4.12; unaffected 0 before 4.12; unaffected 6.6.160 through 6.6.*; unaffected 6.12.114 through 6.12.*; unaffected 6.18.57 through 6.18.*; unaffected 6.19.14 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/20b98d9ffb09763048a7c84b47403eb0f177272c
- https://git.kernel.org/stable/c/2127e6b79d9d579ea538a350d1bbe859e39814d5
- https://git.kernel.org/stable/c/28768bc7ea0b13f558a70f63cc3cfcd32d55d488
- https://git.kernel.org/stable/c/bb37286db65368cb72ba8757ad86299c4e4a73fc
- https://git.kernel.org/stable/c/a6fc88b22bc8d12ad52e8412c667ec0f5bf055af