linux-kernel - Re: [PATCH RFC 2/6] arm64: Kprobes with single stepping support

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Date:	Tue, 12 Nov 2013 11:59:35 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Sandeepa Prabhu <sandeepa.prabhu@...aro.org>
Cc:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Will Deacon <will.deacon@....com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"patches@...aro.org" <patches@...aro.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	"steve.capper@...aro.org" <steve.capper@...aro.org>,
	"nico@...aro.org" <nico@...aro.org>,
	"srikar@...ux.vnet.ibm.com" <srikar@...ux.vnet.ibm.com>,
	"dsaxena@...aro.org" <dsaxena@...aro.org>,
	"Vijaya.Kumar@...iumnetworks.com" <Vijaya.Kumar@...iumnetworks.com>,
	Jiang Liu <liuj97@...il.com>,
	"yrl.pp-manager.tt@...achi.com" <yrl.pp-manager.tt@...achi.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH RFC 2/6] arm64: Kprobes with single stepping support

On Tue, 12 Nov 2013 16:25:26 +0530
Sandeepa Prabhu <sandeepa.prabhu@...aro.org> wrote:


> >
> > BTW, I'm currently trying a general housecleaning of __kprobes
> > annotations. It may also have impact on your patch.
> > https://lkml.org/lkml/2013/11/8/187
> Hmm, we can help testing your patchset on arm64 platforms. Also have
> many doubts on the changes you are working [blacklisting probes etc]
> 
> Basically I had tried placing kprobe on memcpy() and the model hung
> (insmod never returned back!). Fast-model I have does not have option
> of any debug so no clue what happened!.
> memcpy() is low-level call being used internally within kprobes, so
> probably we cannot handle probe on that routine, but then how to make
> sure all such API are rejected by kprobe sub-system ?

Working on ports of ftrace, I found that many of the functions in lib/
are used by several locations that just can't be traced, due to how
low level they are. I just simply blacklisted the entire lib/
directory (See the top of lib/Makefile)

I wonder if there's an easy way to blacklist entire directories from
being used by kprobes too. Or at least do it by a file per file basis.

-- Steve
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