linux-kernel - Re: [PATCH] kprobes/x86: Return correct length in __copy

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Message-ID: <20150316150345.GA18641@gmail.com>
Date:	Mon, 16 Mar 2015 16:03:45 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Eugene Shatokhin <eugene.shatokhin@...alab.ru>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH] kprobes/x86: Return correct length in
 __copy_instruction()


* Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> wrote:

> (2015/03/09 20:19), Eugene Shatokhin wrote:
> > On x86-64, __copy_instruction() always returns 0 (error) if the
> > instruction uses %rip-relative addressing. This is because
> > kernel_insn_init() is called the second time for 'insn' instance
> > in such cases and sets all its fields to 0.
> > 
> > Because of this, trying to place a Kprobe on such instruction will
> > fail, register_kprobe() will return -EINVAL.
> 
> Oops, good catch!
> 
> Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>

Mind resending it with your SOB, as I wasn't Cc:-ed on the original 
submission?

Thanks,

	Ingo
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