CVE-2022-50771

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> rcu: Fix __this_cpu_read() lockdep warning in rcu_force_quiescent_state()<br /> <br /> Running rcutorture with non-zero fqs_duration module parameter in a<br /> kernel built with CONFIG_PREEMPTION=y results in the following splat:<br /> <br /> BUG: using __this_cpu_read() in preemptible [00000000]<br /> code: rcu_torture_fqs/398<br /> caller is __this_cpu_preempt_check+0x13/0x20<br /> CPU: 3 PID: 398 Comm: rcu_torture_fqs Not tainted 6.0.0-rc1-yoctodev-standard+<br /> Call Trace:<br /> <br /> dump_stack_lvl+0x5b/0x86<br /> dump_stack+0x10/0x16<br /> check_preemption_disabled+0xe5/0xf0<br /> __this_cpu_preempt_check+0x13/0x20<br /> rcu_force_quiescent_state.part.0+0x1c/0x170<br /> rcu_force_quiescent_state+0x1e/0x30<br /> rcu_torture_fqs+0xca/0x160<br /> ? rcu_torture_boost+0x430/0x430<br /> kthread+0x192/0x1d0<br /> ? kthread_complete_and_exit+0x30/0x30<br /> ret_from_fork+0x22/0x30<br /> <br /> <br /> The problem is that rcu_force_quiescent_state() uses __this_cpu_read()<br /> in preemptible code instead of the proper raw_cpu_read(). This commit<br /> therefore changes __this_cpu_read() to raw_cpu_read().