linux-kernel - Re: [PATCH tracing/kprobes 1/7] x86/ptrace: Fix regs_get_argument

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Date:	Thu, 10 Sep 2009 21:43:06 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	lkml <linux-kernel@...r.kernel.org>,
	systemtap <systemtap@...rces.redhat.com>,
	DLE <dle-develop@...ts.sourceforge.net>,
	Jim Keniston <jkenisto@...ibm.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Christoph Hellwig <hch@...radead.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Jason Baron <jbaron@...hat.com>,
	"K.Prasad" <prasad@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Tom Zanussi <tzanussi@...il.com>
Subject: Re: [PATCH tracing/kprobes 1/7] x86/ptrace: Fix
 regs_get_argument_nth() to add correct offset

On Thu, 2009-09-10 at 19:53 -0400, Masami Hiramatsu wrote:

> ---
> 
>  arch/x86/kernel/ptrace.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
> index a33a17d..caffb68 100644
> --- a/arch/x86/kernel/ptrace.c
> +++ b/arch/x86/kernel/ptrace.c
> @@ -150,7 +150,7 @@ static const int arg_offs_table[] = {
>  unsigned long regs_get_argument_nth(struct pt_regs *regs, unsigned int n)
>  {
>  	if (n < ARRAY_SIZE(arg_offs_table))
> -		return *((unsigned long *)regs + arg_offs_table[n]);
> +		return *(unsigned long *)((char *)regs + arg_offs_table[n]);

That definitely looks like a bug.

Acked-by: Steven Rostedt <rostedt@...dmis.org>

-- Steve

>  	else {
>  		/*
>  		 * The typical case: arg n is on the stack.
> 
> 

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