linux-kernel - [tip:perf/urgent] perf probe: Fix to ensure function declared file

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Date:	Wed, 6 Apr 2011 11:12:52 GMT
From:	tip-bot for Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	acme@...hat.com, linux-kernel@...r.kernel.org, hpa@...or.com,
	mingo@...hat.com, peterz@...radead.org,
	masami.hiramatsu.pt@...achi.com, fweisbec@...il.com,
	ming.m.lin@...el.com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:perf/urgent] perf probe: Fix to ensure function declared file

Commit-ID:  7d21635ac5c78abe162fb3f56b37c30bcbfa019f
Gitweb:     http://git.kernel.org/tip/7d21635ac5c78abe162fb3f56b37c30bcbfa019f
Author:     Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
AuthorDate: Wed, 30 Mar 2011 18:25:41 +0900
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Tue, 5 Apr 2011 15:34:53 -0300

perf probe: Fix to ensure function declared file

Fix to ensure function declared file matches given file name. This fixes
a potential bug.

As I've commented on Lin Ming's fastpath enhancement, decl_file should
be checked on each probe point if user gives a probe point as func@...e.

Cc: 2nddept-manager@....hitachi.co.jp
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...e.hu>
Cc: Lin Ming <ming.m.lin@...el.com>
Cc: Peter Zijlstra <peterz@...radead.org>
LKML-Reference: <20110330092541.2132.3584.stgit@...236.sdl.hitachi.co.jp>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/probe-finder.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index 194f9e2..3bcd140 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -1395,6 +1395,10 @@ static int probe_point_search_cb(Dwarf_Die *sp_die, void *data)
 	    !die_compare_name(sp_die, pp->function))
 		return DWARF_CB_OK;
 
+	/* Check declared file */
+	if (pp->file && strtailcmp(pp->file, dwarf_decl_file(sp_die)))
+		return DWARF_CB_OK;
+
 	pf->fname = dwarf_decl_file(sp_die);
 	if (pp->line) { /* Function relative line */
 		dwarf_decl_line(sp_die, &pf->lno);
@@ -1840,6 +1844,10 @@ static int line_range_search_cb(Dwarf_Die *sp_die, void *data)
 	struct line_finder *lf = param->data;
 	struct line_range *lr = lf->lr;
 
+	/* Check declared file */
+	if (lr->file && strtailcmp(lr->file, dwarf_decl_file(sp_die)))
+		return DWARF_CB_OK;
+
 	if (dwarf_tag(sp_die) == DW_TAG_subprogram &&
 	    die_compare_name(sp_die, lr->function)) {
 		lf->fname = dwarf_decl_file(sp_die);
--
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