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perf ftrace: Use CAP_SYS_ADMIN instead of euid==0 

The kernel requires CAP_SYS_ADMIN instead of euid==0 to mount debugfs
for ftrace.  Make perf do the same.

Signed-off-by: Igor Lubashev <ilubashe@akamai.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexey Budankov <alexey.budankov@linux.intel.com>
Cc: James Morris <jmorris@namei.org>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/bd8763b72ed4d58d0b42d44fbc7eb474d32e53a3.1565188228.git.ilubashe@akamai.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
alistair/sunxi64-5.4-dsi
Igor Lubashev 2019-08-07 10:44:17 -04:00 committed by Arnaldo Carvalho de Melo
parent 083c1359b0
commit c766f3df63
1 changed files with 3 additions and 1 deletions
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4
tools/perf/builtin-ftrace.c
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@ -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;
}