linux-kernel - [tip:perf/urgent] perf probe: Ensure offset provided is not greater than function length without DWARF info too

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Message-ID: <tip-1c1bc9223387dacc48eb2b61b0baabe7e9cf47f6@git.kernel.org>
Date:	Fri, 2 Mar 2012 01:52:15 -0800
From:	tip-bot for Prashanth Nageshappa <prashanth@...ux.vnet.ibm.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, linux-kernel@...r.kernel.org, hpa@...or.com,
	mingo@...hat.com, prashanth@...ux.vnet.ibm.com, ananth@...ibm.com,
	masami.hiramatsu.pt@...achi.com, rostedt@...dmis.org,
	akpm@...ux-foundation.org, srikar@...ux.vnet.ibm.com,
	tglx@...utronix.de, jbaron@...hat.com
Subject: [tip:perf/urgent] perf probe:
  Ensure offset provided is not greater than function length without DWARF info too

Commit-ID:  1c1bc9223387dacc48eb2b61b0baabe7e9cf47f6
Gitweb:     http://git.kernel.org/tip/1c1bc9223387dacc48eb2b61b0baabe7e9cf47f6
Author:     Prashanth Nageshappa <prashanth@...ux.vnet.ibm.com>
AuthorDate: Tue, 28 Feb 2012 09:43:01 +0530
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Wed, 29 Feb 2012 18:29:46 -0300

perf probe: Ensure offset provided is not greater than function length without DWARF info too

The 'perf probe' command allows kprobe to be inserted at any offset from
a function start, which results in adding kprobes to unintended
location.  (example: perf probe do_fork+10000 is allowed even though
size of do_fork is ~904).

My previous patch https://lkml.org/lkml/2012/2/24/42 addressed the case
where DWARF info was available for the kernel. This patch fixes the
case where perf probe is used on a kernel without debuginfo available.

Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: Ananth N Mavinakayanahalli <ananth@...ibm.com>
Cc: Jason Baron <jbaron@...hat.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Link: http://lkml.kernel.org/r/4F4C544D.1010909@linux.vnet.ibm.com
Signed-off-by: Prashanth Nageshappa <prashanth@...ux.vnet.ibm.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/probe-event.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 29cb654..e33554a 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -1867,6 +1867,12 @@ static int convert_to_probe_trace_events(struct perf_probe_event *pev,
 			   tev->point.symbol);
 		ret = -ENOENT;
 		goto error;
+	} else if (tev->point.offset > sym->end - sym->start) {
+		pr_warning("Offset specified is greater than size of %s\n",
+			   tev->point.symbol);
+		ret = -ENOENT;
+		goto error;
+
 	}
 
 	return 1;
--
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