Re: [PATCH -next] x86: Prevent KASAN false positive warnings in __show_regs()

[Josh Poimboeuf]

On Thu, Aug 28, 2025 at 08:06:17PM +0800, Tengda Wu wrote:
> +++ b/arch/x86/kernel/dumpstack.c
> @@ -189,9 +189,15 @@ static void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
>         unsigned long visit_mask = 0;
>         int graph_idx = 0;
>         bool partial = false;
> +       bool kasan_disabled = false;
>  
>         printk("%sCall Trace:\n", log_lvl);
>  
> +       if (task != current) {
> +               kasan_disable_current();
> +               kasan_disabled = true;
> +       }

Looks reasonable to me, though note that some callers pass a NULL @task
to indicate 'current'.

(No idea why, that subtlety should probably be removed...)

So this might need to be

	if (task && task != current) {
		...

-- 
Josh