linux-kernel - [PATCH v1] perf report: Fix owner error when reading perf.data

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Date:	Thu,  1 Oct 2015 18:03:34 +0900
From:	Taeung Song <treeze.taeung@...il.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	linux-kernel@...r.kernel.org, jolsa@...hat.com,
	namhyung@...nel.org, Ingo Molnar <mingo@...hat.com>,
	Taeung Song <treeze.taeung@...il.com>
Subject: [PATCH v1] perf report: Fix owner error when reading perf.data

If perf.data file is owned by some user,
it can't be read even if current user is root.
A 'st_uid' from fstat() is user ID of the file owner.
Therefore use getuid() instead of st_uid to check if
user of the calling 'perf' process is root or not.

Signed-off-by: Taeung Song <treeze.taeung@...il.com>
---
 tools/perf/util/data.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c
index 1921942..91ebe4e 100644
--- a/tools/perf/util/data.c
+++ b/tools/perf/util/data.c
@@ -67,7 +67,7 @@ static int open_file_read(struct perf_data_file *file)
 	if (fstat(fd, &st) < 0)
 		goto out_close;
 
-	if (!file->force && st.st_uid && (st.st_uid != geteuid())) {
+	if (!file->force && getuid() && (st.st_uid != geteuid())) {
 		pr_err("File %s not owned by current user or root (use -f to override)\n",
 		       file->path);
 		goto out_close;
-- 
1.9.1

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