linux-kernel - Re: [tip:tracing/ftrace] kernel/trace/trace_functions_graph.c: fix nsecs

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Date:	Mon, 23 Mar 2009 18:15:36 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	mingo@...hat.com, hpa@...or.com, linux-kernel@...r.kernel.org,
	rostedt@...dmis.org, tglx@...utronix.de, daniel@...aq.de,
	linux-tip-commits@...r.kernel.org
Subject: Re: [tip:tracing/ftrace] kernel/trace/trace_functions_graph.c: fix
	nsecs_str buffer size


* Frederic Weisbecker <fweisbec@...il.com> wrote:

> On Mon, Mar 23, 2009 at 04:42:27PM +0000, Daniel Mack wrote:
> > Commit-ID:  603b9b9081ae0a1af986b9059a0a5055876ddea9
> > Gitweb:     http://git.kernel.org/tip/603b9b9081ae0a1af986b9059a0a5055876ddea9
> > Author:     Daniel Mack <daniel@...aq.de>
> > AuthorDate: Mon, 23 Mar 2009 17:10:37 +0100
> > Committer:  Ingo Molnar <mingo@...e.hu>
> > CommitDate: Mon, 23 Mar 2009 17:40:51 +0100
> > 
> > kernel/trace/trace_functions_graph.c: fix nsecs_str buffer size
> > 
> > Impact: fix currently inactive buffer-overflow
> > 
> > In kernel/trace/trace_functions_graph.c, print_graph_duration(),
> > len can be as low as 1 or 2, which could make snprintf() write
> > beyond the buffer bounds. (Found by cppcheck, no real-world bug
> > occured)
> > 
> > Signed-off-by: Daniel Mack <daniel@...aq.de>
> > Cc: Steven Rostedt <rostedt@...dmis.org>
> > Cc: Frederic Weisbecker <fweisbec@...il.com>
> > LKML-Reference: <1237824637-28190-1-git-send-email-daniel@...aq.de>
> > Signed-off-by: Ingo Molnar <mingo@...e.hu>
> > 
> > 
> > ---
> >  kernel/trace/trace_functions_graph.c |    2 +-
> >  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> 
> 
> Ingo, as I explained to Daniel before (I should have Cc you),
> there is no overflow to protect here, so this patch will not
> change anything.
> 
> This is my bad, I should better comment my code.

Yeah - saw your reply, and zapped the commit already. Please add a 
comment in any case.

	Ingo
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