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From: Igor Lubashev <ilubashe@akamai.com>
To: <linux-kernel@vger.kernel.org>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Jiri Olsa <jolsa@redhat.com>,
	Alexey Budankov <alexey.budankov@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Mathieu Poirier <mathieu.poirier@linaro.org>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Namhyung Kim <namhyung@kernel.org>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	<linux-arm-kernel@lists.infradead.org>,
	James Morris <jmorris@namei.org>,
	Igor Lubashev <ilubashe@akamai.com>
Subject: [PATCH v2 4/4] perf: Use CAP_SYS_ADMIN instead of euid==0 with ftrace
Date: Tue, 6 Aug 2019 23:35:57 -0400	[thread overview]
Message-ID: <eb995d4d73fb58e6a1c1560803beec048cafb4d7.1565146171.git.ilubashe@akamai.com> (raw)
In-Reply-To: <cover.1565146171.git.ilubashe@akamai.com>

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>
---
 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 ae1466aa3b26..d09eac8a6d57 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


WARNING: multiple messages have this Message-ID (diff)
From: Igor Lubashev <ilubashe@akamai.com>
To: <linux-kernel@vger.kernel.org>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Jiri Olsa <jolsa@redhat.com>,
	Alexey Budankov <alexey.budankov@linux.intel.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Igor Lubashev <ilubashe@akamai.com>,
	James Morris <jmorris@namei.org>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Ingo Molnar <mingo@redhat.com>,
	Namhyung Kim <namhyung@kernel.org>,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 4/4] perf: Use CAP_SYS_ADMIN instead of euid==0 with ftrace
Date: Tue, 6 Aug 2019 23:35:57 -0400	[thread overview]
Message-ID: <eb995d4d73fb58e6a1c1560803beec048cafb4d7.1565146171.git.ilubashe@akamai.com> (raw)
In-Reply-To: <cover.1565146171.git.ilubashe@akamai.com>

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>
---
 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 ae1466aa3b26..d09eac8a6d57 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


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  parent reply	other threads:[~2019-08-07  3:37 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-07  3:35 [PATCH v2 0/4] perf: Use capabilities instead of uid and euid Igor Lubashev
2019-08-07  3:35 ` Igor Lubashev
2019-08-07  3:35 ` [PATCH v2 1/4] perf: Add capability-related utilities Igor Lubashev
2019-08-07  3:35   ` Igor Lubashev
2019-08-07  3:35 ` [PATCH v2 2/4] perf: Use CAP_SYS_ADMIN with perf_event_paranoid checks Igor Lubashev
2019-08-07  3:35   ` Igor Lubashev
2019-08-07 11:44   ` Alexey Budankov
2019-08-07 11:44     ` Alexey Budankov
2019-08-07 11:46   ` Jiri Olsa
2019-08-07 11:46     ` Jiri Olsa
2019-08-07 14:56     ` Lubashev, Igor
2019-08-07 14:56       ` Lubashev, Igor
2019-08-07  3:35 ` [PATCH v2 3/4] perf: Use CAP_SYSLOG with kptr_restrict checks Igor Lubashev
2019-08-07  3:35   ` Igor Lubashev
2019-08-07  3:35 ` Igor Lubashev [this message]
2019-08-07  3:35   ` [PATCH v2 4/4] perf: Use CAP_SYS_ADMIN instead of euid==0 with ftrace Igor Lubashev

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