linux-kernel - Re: [patch V4 part 1 18/36] samples/kprobes: Add __kprobes and NOKPROBE

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Date:   Wed, 6 May 2020 17:57:56 +0200
From:   Alexandre Chartre <alexandre.chartre@...cle.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, "Paul E. McKenney" <paulmck@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Frederic Weisbecker <frederic@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Brian Gerst <brgerst@...il.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Will Deacon <will@...nel.org>
Subject: Re: [patch V4 part 1 18/36] samples/kprobes: Add __kprobes and
 NOKPROBE_SYMBOL() for handlers.


On 5/5/20 3:16 PM, Thomas Gleixner wrote:
> From: Masami Hiramatsu <mhiramat@...nel.org>
> 
> Add __kprobes and NOKPROBE_SYMBOL() for sample kprobe handlers.
> 
> Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Link: https://lkml.kernel.org/r/158523421177.24735.16273975317343670204.stgit@devnote2
> 
> ---
>   samples/kprobes/kprobe_example.c    |    6 ++++--
>   samples/kprobes/kretprobe_example.c |    2 ++
>   2 files changed, 6 insertions(+), 2 deletions(-)

Reviewed-by: Alexandre Chartre <alexandre.chartre@...cle.com>

alex.

> 
> --- a/samples/kprobes/kprobe_example.c
> +++ b/samples/kprobes/kprobe_example.c
> @@ -25,7 +25,7 @@ static struct kprobe kp = {
>   };
>   
>   /* kprobe pre_handler: called just before the probed instruction is executed */
> -static int handler_pre(struct kprobe *p, struct pt_regs *regs)
> +static int __kprobes handler_pre(struct kprobe *p, struct pt_regs *regs)
>   {
>   #ifdef CONFIG_X86
>   	pr_info("<%s> pre_handler: p->addr = 0x%p, ip = %lx, flags = 0x%lx\n",
> @@ -54,7 +54,7 @@ static int handler_pre(struct kprobe *p,
>   }
>   
>   /* kprobe post_handler: called after the probed instruction is executed */
> -static void handler_post(struct kprobe *p, struct pt_regs *regs,
> +static void __kprobes handler_post(struct kprobe *p, struct pt_regs *regs,
>   				unsigned long flags)
>   {
>   #ifdef CONFIG_X86
> @@ -90,6 +90,8 @@ static int handler_fault(struct kprobe *
>   	/* Return 0 because we don't handle the fault. */
>   	return 0;
>   }
> +/* NOKPROBE_SYMBOL() is also available */
> +NOKPROBE_SYMBOL(handler_fault);
>   
>   static int __init kprobe_init(void)
>   {
> --- a/samples/kprobes/kretprobe_example.c
> +++ b/samples/kprobes/kretprobe_example.c
> @@ -48,6 +48,7 @@ static int entry_handler(struct kretprob
>   	data->entry_stamp = ktime_get();
>   	return 0;
>   }
> +NOKPROBE_SYMBOL(entry_handler);
>   
>   /*
>    * Return-probe handler: Log the return value and duration. Duration may turn
> @@ -67,6 +68,7 @@ static int ret_handler(struct kretprobe_
>   			func_name, retval, (long long)delta);
>   	return 0;
>   }
> +NOKPROBE_SYMBOL(ret_handler);
>   
>   static struct kretprobe my_kretprobe = {
>   	.handler		= ret_handler,
>