From: Igor Lubashev ilubashe@akamai.com
[ Upstream commit c766f3df635de14295e410c6dd5410bc416c24a0 ]
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... Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- 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 22386ab350504..2026364a61dc2 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; }