Re: [PATCH] cfi: Fix __cfi_slowpath_diag RCU usage with cpuidle

[Kees Cook]

On Tue, 31 May 2022 10:59:10 -0700, Sami Tolvanen wrote:
> RCU_NONIDLE usage during __cfi_slowpath_diag can result in an invalid
> RCU state in the cpuidle code path:
> 
>   WARNING: CPU: 1 PID: 0 at kernel/rcu/tree.c:613 rcu_eqs_enter+0xe4/0x138
>   ...
>   Call trace:
>     rcu_eqs_enter+0xe4/0x138
>     rcu_idle_enter+0xa8/0x100
>     cpuidle_enter_state+0x154/0x3a8
>     cpuidle_enter+0x3c/0x58
>     do_idle.llvm.6590768638138871020+0x1f4/0x2ec
>     cpu_startup_entry+0x28/0x2c
>     secondary_start_kernel+0x1b8/0x220
>     __secondary_switched+0x94/0x98
> 
> [...]

Applied to for-next/hardening, thanks!

[1/1] cfi: Fix __cfi_slowpath_diag RCU usage with cpuidle
      https://git.kernel.org/kees/c/57cd6d157eb4

-- 
Kees Cook