linux-kernel - Re: [PATCH] riscv: add do_page_fault and do_trap

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Message-ID: <mhng-91078457-1fd6-425a-a7d8-d18be7088cea@palmerdabbelt-glaptop>
Date:   Sun, 11 Apr 2021 18:09:06 -0700 (PDT)
From:   Palmer Dabbelt <palmer@...belt.com>
To:     jszhang3@...l.ustc.edu.cn
CC:     Paul Walmsley <paul.walmsley@...ive.com>, aou@...s.berkeley.edu,
        mhiramat@...nel.org, guoren@...ux.alibaba.com,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject:     Re: [PATCH] riscv: add do_page_fault and do_trap_break into the kprobes blacklist

On Mon, 29 Mar 2021 11:12:26 PDT (-0700), jszhang3@...l.ustc.edu.cn wrote:
> From: Jisheng Zhang <jszhang@...nel.org>
>
> These two functions are used to implement the kprobes feature so they
> can't be kprobed.
>
> Fixes: c22b0bcb1dd0 ("riscv: Add kprobes supported")
> Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
> ---
>  arch/riscv/kernel/traps.c | 1 +
>  arch/riscv/mm/fault.c     | 1 +
>  2 files changed, 2 insertions(+)
>
> diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c
> index 0879b5df11b9..1357abf79570 100644
> --- a/arch/riscv/kernel/traps.c
> +++ b/arch/riscv/kernel/traps.c
> @@ -178,6 +178,7 @@ asmlinkage __visible void do_trap_break(struct pt_regs *regs)
>  	else
>  		die(regs, "Kernel BUG");
>  }
> +NOKPROBE_SYMBOL(do_trap_break);
>
>  #ifdef CONFIG_GENERIC_BUG
>  int is_valid_bugaddr(unsigned long pc)
> diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c
> index 8f17519208c7..c5dbd55cbf7c 100644
> --- a/arch/riscv/mm/fault.c
> +++ b/arch/riscv/mm/fault.c
> @@ -328,3 +328,4 @@ asmlinkage void do_page_fault(struct pt_regs *regs)
>  	}
>  	return;
>  }
> +NOKPROBE_SYMBOL(do_page_fault);

Thanks, this is on fixes.