Re: [PATCH] Introduce the pkill_on_warn boot parameter

[Dave Hansen]

On 9/29/21 11:58 AM, Alexander Popov wrote:
> --- a/kernel/panic.c
> +++ b/kernel/panic.c
> @@ -53,6 +53,7 @@ static int pause_on_oops_flag;
>  static DEFINE_SPINLOCK(pause_on_oops_lock);
>  bool crash_kexec_post_notifiers;
>  int panic_on_warn __read_mostly;
> +int pkill_on_warn __read_mostly;
>  unsigned long panic_on_taint;
>  bool panic_on_taint_nousertaint = false;
>  
> @@ -610,6 +611,9 @@ void __warn(const char *file, int line, void *caller, unsigned taint,
>  
>  	print_oops_end_marker();
>  
> +	if (pkill_on_warn && system_state >= SYSTEM_RUNNING)
> +		do_group_exit(SIGKILL);
> +
>  	/* Just a warning, don't kill lockdep. */
>  	add_taint(taint, LOCKDEP_STILL_OK);
>  }

Doesn't this tie into the warning *printing* code?  That's better than
nothing, for sure.  But, if we're doing this for hardening, I think we
would want to kill anyone provoking a warning, not just the first one
that triggered *printing* the warning.