CVE-2022-50771
Description
In the Linux kernel, the following vulnerability has been resolved: rcu: Fix __this_cpu_read() lockdep warning in rcu_force_quiescent_state() Running rcutorture with non-zero fqs_duration module parameter in a kernel built with CONFIG_PREEMPTION=y results in the following splat: BUG: using __this_cpu_read() in preemptible [00000000] code: rcu_torture_fqs/398 caller is __this_cpu_preempt_check+0x13/0x20 CPU: 3 PID: 398 Comm: rcu_torture_fqs Not tainted 6.0.0-rc1-yoctodev-standard+ Call Trace: <TASK> dump_stack_lvl+0x5b/0x86 dump_stack+0x10/0x16 check_preemption_disabled+0xe5/0xf0 __this_cpu_preempt_check+0x13/0x20 rcu_force_quiescent_state.part.0+0x1c/0x170 rcu_force_quiescent_state+0x1e/0x30 rcu_torture_fqs+0xca/0x160 ? rcu_torture_boost+0x430/0x430 kthread+0x192/0x1d0 ? kthread_complete_and_exit+0x30/0x30 ret_from_fork+0x22/0x30 </TASK> The problem is that rcu_force_quiescent_state() uses __this_cpu_read() in preemptible code instead of the proper raw_cpu_read(). This commit therefore changes __this_cpu_read() to raw_cpu_read().
How to fix
- Linux Linux3d92527a919edd1aa381bdd6c299dd75a8167396, 5a52380b8193cf8be6c4a6b94b86ef64ed80c0dc, 98a5b1265a36e9d843a51ddd6c9fa02da50d2c57, a74af9b937707b42c3fd041aae1ed4ce2f337307, 80a3e7ab477b3655615fc1627c88c248d4ad28d9, ceb1c8c9b8aa9199da46a0f29d2d5f08d9b44c15 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | d860d40327dde251d508a234fa00bd0d90fbb656 ≤ v < 3d92527a919edd1aa381bdd6c299dd75a8167396, d860d40327dde251d508a234fa00bd0d90fbb656 ≤ v < 5a52380b8193cf8be6c4a6b94b86ef64ed80c0dc, d860d40327dde251d508a234fa00bd0d90fbb656 ≤ v < 98a5b1265a36e9d843a51ddd6c9fa02da50d2c57, d860d40327dde251d508a234fa00bd0d90fbb656 ≤ v < a74af9b937707b42c3fd041aae1ed4ce2f337307, d860d40327dde251d508a234fa00bd0d90fbb656 ≤ v < 80a3e7ab477b3655615fc1627c88c248d4ad28d9, d860d40327dde251d508a234fa00bd0d90fbb656 ≤ v < ceb1c8c9b8aa9199da46a0f29d2d5f08d9b44c15, 3.17 | 3d92527a919edd1aa381bdd6c299dd75a8167396, 5a52380b8193cf8be6c4a6b94b86ef64ed80c0dc, 98a5b1265a36e9d843a51ddd6c9fa02da50d2c57, a74af9b937707b42c3fd041aae1ed4ce2f337307, 80a3e7ab477b3655615fc1627c88c248d4ad28d9, ceb1c8c9b8aa9199da46a0f29d2d5f08d9b44c15 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.