linux-kernel - Re: [PATCH 01/52] perf tools: Fix jump label always changing during tracing

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Message-ID: <20140723065822.GN3935@laptop>
Date:	Wed, 23 Jul 2014 08:58:22 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	linux-kernel@...r.kernel.org, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 01/52] perf tools: Fix jump label always changing during
 tracing

On Wed, Jul 23, 2014 at 09:07:32AM +0300, Adrian Hunter wrote:
> On 07/22/2014 05:11 PM, Peter Zijlstra wrote:
> > On Tue, Jul 22, 2014 at 11:00:34AM -0300, Arnaldo Carvalho de Melo wrote:
> >> Em Tue, Jul 22, 2014 at 04:17:10PM +0300, Adrian Hunter escreveu:
> >>> Intel PT decoding walks the object code to reconstruct
> >>> the trace.  A jump label change during tracing causes
> >>> decoding errors.
> > 
> > You'd better fix that, jump_labels can change any time and they're all
> > over the frigging place.
> > 
> 
> Perhaps a general method is needed to be able to deal with kernel
> self-modifying code.

I know people are looking at doing the same to userspace, is that also a
problem?
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