linux-kernel - Re: FInal kprobes rollup patches

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Message-ID: <20071217142235.GA21379@linux.vnet.ibm.com>
Date:	Mon, 17 Dec 2007 19:52:35 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Harvey Harrison <harvey.harrison@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Maneesh Soni <maneesh@...ux.vnet.ibm.com>,
	srinivasa@...ibm.com, Jim Keniston <jkenisto@...ibm.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Masami Hiramatsu <hiramatu@....hitachi.co.jp>,
	Rusty Lynch <rusty.lynch@...el.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Keshavamurthy Anil S <anil.s.keshavamurthy@...el.com>
Subject: Re: FInal kprobes rollup patches

* Ingo Molnar <mingo@...e.hu> [2007-12-15 14:12:04]:


Hi Ingo, Harvey

In file include/asm-x86/kprobes_32.h
typedef u8 kprobe_opcode_t;
hence sizeof(kprobe_opcode_t) turns out to be 1.

Hence

memcpy(p->ainsn.insn, p->addr, MAX_INSN_SIZE * sizeof(kprobe_opcode_t));
is correct.

--
Regards
Srikar




> 
> * Harvey Harrison <harvey.harrison@...il.com> wrote:
> 
> > If you compare this memcpy from arch_prepare_kprobe in 32/64 bit I'm 
> > almost sure the X86_32 version should be
> > 
> > ... + sizeof(kprobe_opcode_t)
> > 
> > not
> > 
> > ... * sizeof(kprobe_opcode_t)
> 
> good point. I've Cc:-ed the top authors of kprobes.c. Could anyone 
> confirm (or deny) that Harvey found a real kprobes bug here?
> 
> 	Ingo
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