linux-kernel - [PATCH 4/3] perf: Use CAP_SYS_ADMIN instead of euid==0 with ftrace

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Date:   Wed, 17 Jul 2019 14:15:59 -0400
From:   Igor Lubashev <ilubashe@...mai.com>
To:     <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexey Budankov <alexey.budankov@...ux.intel.com>
CC:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Igor Lubashev <ilubashe@...mai.com>
Subject: [PATCH 4/3] perf: Use CAP_SYS_ADMIN instead of euid==0 with ftrace

Kernel requires CAP_SYS_ADMIN instead of euid==0 to mount debugfs for ftrace.
Make perf require the same.

Signed-off-by: Igor Lubashev <ilubashe@...mai.com>
---
 tools/perf/builtin-ftrace.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
index 9c228c55e1fb..2f632b11ebba 100644
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c
@@ -13,6 +13,7 @@
 #include <signal.h>
 #include <fcntl.h>
 #include <poll.h>
+#include <linux/capability.h>
 
 #include "debug.h"
 #include <subcmd/parse-options.h>
@@ -21,6 +22,7 @@
 #include "target.h"
 #include "cpumap.h"
 #include "thread_map.h"
+#include "util/cap.h"
 #include "util/config.h"
 
 
@@ -281,7 +283,7 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv)
 		.events = POLLIN,
 	};
 
-	if (geteuid() != 0) {
+	if (!perf_cap__capable(CAP_SYS_ADMIN)) {
 		pr_err("ftrace only works for root!\n");
 		return -1;
 	}
-- 
2.7.4