linux-kernel - Re: [PATCH] tracing/kprobes: fix probe parsing

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Date:	Wed, 10 Feb 2010 17:26:39 -0500
From:	Masami Hiramatsu <mhiramat@...hat.com>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
CC:	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tracing/kprobes: fix probe parsing

Heiko Carstens wrote:
> From: Heiko Carstens <heiko.carstens@...ibm.com>
> 
> Trying to add a probe like
> 
> echo p:myprobe 0x10000 > /sys/kernel/debug/tracing/kprobe_events
> 
> will fail since the wrong pointer is passed to strict_strtoul
> when trying to convert the address to an unsigned long.

Right, it's a bug! Thank you!


> 
> Signed-off-by: Heiko Carstens <heiko.carstens@...ibm.com>

Acked-by: Masami Hiramatsu <mhiramat@...hat.com>

> ---
>  kernel/trace/trace_kprobe.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> --- a/kernel/trace/trace_kprobe.c
> +++ b/kernel/trace/trace_kprobe.c
> @@ -689,7 +689,7 @@ static int create_trace_probe(int argc, 
>  			return -EINVAL;
>  		}
>  		/* an address specified */
> -		ret = strict_strtoul(&argv[0][2], 0, (unsigned long *)&addr);
> +		ret = strict_strtoul(&argv[1][0], 0, (unsigned long *)&addr);
>  		if (ret) {
>  			pr_info("Failed to parse address.\n");
>  			return ret;

-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division

e-mail: mhiramat@...hat.com

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