[RFC PATCH v2 1/2] ARM/mm/fault: always goto bad_area when handling with page faults of kernel address

[Sebastian Andrzej Siewior]

On 2025-11-27 22:01:08 [+0800], Xie Yuanbin wrote:
> --- a/arch/arm/mm/fault.c
> +++ b/arch/arm/mm/fault.c
> @@ -270,10 +270,15 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
>  	vm_flags_t vm_flags = VM_ACCESS_FLAGS;
>  
>  	if (kprobe_page_fault(regs, fsr))
>  		return 0;
>  
> +	if (unlikely(addr >= TASK_SIZE)) {
> +		fault = 0;
> +		code = SEGV_MAPERR;
> +		goto bad_area;
> +	}
>  
>  	/* Enable interrupts if they were enabled in the parent context. */
>  	if (interrupts_enabled(regs))
>  		local_irq_enable();

What is with the patch I sent wrong?

Sebastian