Re: [PATCH 2/3] arm64: kprobes: Remove unneeded RODATA check

[James Morse]

Hi!

On 17/12/2018 06:41, Masami Hiramatsu wrote:
> Remove unneeded RODATA check from arch_prepare_kprobe().
> 
> Since check_kprobe_address_safe() already ensured that
> the probe address is in kernel text, we don't need to
> check whether the address in RODATA or not. That must
> be always false.

So it does!

Reviewed-by: James Morse <james.morse@xxxxxxx>


Thanks

James

> diff --git a/arch/arm64/kernel/probes/kprobes.c b/arch/arm64/kernel/probes/kprobes.c
> index b2d4b7428ebc..1dae500d0a81 100644
> --- a/arch/arm64/kernel/probes/kprobes.c
> +++ b/arch/arm64/kernel/probes/kprobes.c
> @@ -91,8 +91,6 @@ static void __kprobes arch_simulate_insn(struct kprobe *p, struct pt_regs *regs)
>  int __kprobes arch_prepare_kprobe(struct kprobe *p)
>  {
>  	unsigned long probe_addr = (unsigned long)p->addr;
> -	extern char __start_rodata[];
> -	extern char __end_rodata[];
>  
>  	if (probe_addr & 0x3)
>  		return -EINVAL;
> @@ -106,10 +104,6 @@ int __kprobes arch_prepare_kprobe(struct kprobe *p)
>  	if (search_exception_tables(probe_addr))
>  		return -EINVAL;
>  
> -	if (probe_addr >= (unsigned long) __start_rodata &&
> -	    probe_addr <= (unsigned long) __end_rodata)
> -		return -EINVAL;
> -
>  	/* decode instruction */
>  	switch (arm_kprobe_decode_insn(p->addr, &p->ainsn)) {
>  	case INSN_REJECTED:	/* insn not supported */
>