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 2/4] perf: Use CAP_SYS_ADMIN with perf_event_paranoid checks
Date: Tue, 6 Aug 2019 23:35:55 -0400 [thread overview]
Message-ID: <70ce92d9c252bbafa883a6b5b3c96cf10d1a5b31.1565146171.git.ilubashe@akamai.com> (raw)
In-Reply-To: <cover.1565146171.git.ilubashe@akamai.com>
The kernel is using CAP_SYS_ADMIN instead of euid==0 to override
perf_event_paranoid check. Make perf do the same.
Signed-off-by: Igor Lubashev <ilubashe@akamai.com>
---
tools/perf/arch/arm/util/cs-etm.c | 3 ++-
tools/perf/arch/arm64/util/arm-spe.c | 4 ++--
tools/perf/arch/x86/util/intel-bts.c | 3 ++-
tools/perf/arch/x86/util/intel-pt.c | 2 +-
tools/perf/util/evsel.c | 2 +-
5 files changed, 8 insertions(+), 6 deletions(-)
diff --git a/tools/perf/arch/arm/util/cs-etm.c b/tools/perf/arch/arm/util/cs-etm.c
index 5cb07e8cb296..b87a1ca2968f 100644
--- a/tools/perf/arch/arm/util/cs-etm.c
+++ b/tools/perf/arch/arm/util/cs-etm.c
@@ -18,6 +18,7 @@
#include "../../perf.h"
#include "../../util/auxtrace.h"
#include "../../util/cpumap.h"
+#include "../../util/event.h"
#include "../../util/evlist.h"
#include "../../util/evsel.h"
#include "../../util/pmu.h"
@@ -254,7 +255,7 @@ static int cs_etm_recording_options(struct auxtrace_record *itr,
struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu;
struct evsel *evsel, *cs_etm_evsel = NULL;
struct perf_cpu_map *cpus = evlist->core.cpus;
- bool privileged = (geteuid() == 0 || perf_event_paranoid() < 0);
+ bool privileged = perf_event_paranoid_check(-1);
int err = 0;
ptr->evlist = evlist;
diff --git a/tools/perf/arch/arm64/util/arm-spe.c b/tools/perf/arch/arm64/util/arm-spe.c
index 00915b8fd05b..200bc973371b 100644
--- a/tools/perf/arch/arm64/util/arm-spe.c
+++ b/tools/perf/arch/arm64/util/arm-spe.c
@@ -12,6 +12,7 @@
#include <time.h>
#include "../../util/cpumap.h"
+#include "../../util/event.h"
#include "../../util/evsel.h"
#include "../../util/evlist.h"
#include "../../util/session.h"
@@ -65,8 +66,7 @@ static int arm_spe_recording_options(struct auxtrace_record *itr,
struct arm_spe_recording *sper =
container_of(itr, struct arm_spe_recording, itr);
struct perf_pmu *arm_spe_pmu = sper->arm_spe_pmu;
- struct evsel *evsel, *arm_spe_evsel = NULL;
- bool privileged = geteuid() == 0 || perf_event_paranoid() < 0;
+ bool privileged = perf_event_paranoid_check(-1);
struct evsel *tracking_evsel;
int err;
diff --git a/tools/perf/arch/x86/util/intel-bts.c b/tools/perf/arch/x86/util/intel-bts.c
index 7b23318ebd7b..56a76142e9fd 100644
--- a/tools/perf/arch/x86/util/intel-bts.c
+++ b/tools/perf/arch/x86/util/intel-bts.c
@@ -12,6 +12,7 @@
#include <linux/zalloc.h>
#include "../../util/cpumap.h"
+#include "../../util/event.h"
#include "../../util/evsel.h"
#include "../../util/evlist.h"
#include "../../util/session.h"
@@ -107,7 +108,7 @@ static int intel_bts_recording_options(struct auxtrace_record *itr,
struct perf_pmu *intel_bts_pmu = btsr->intel_bts_pmu;
struct evsel *evsel, *intel_bts_evsel = NULL;
const struct perf_cpu_map *cpus = evlist->core.cpus;
- bool privileged = geteuid() == 0 || perf_event_paranoid() < 0;
+ bool privileged = perf_event_paranoid_check(-1);
btsr->evlist = evlist;
btsr->snapshot_mode = opts->auxtrace_snapshot_mode;
diff --git a/tools/perf/arch/x86/util/intel-pt.c b/tools/perf/arch/x86/util/intel-pt.c
index 218a4e694618..43d5088ee824 100644
--- a/tools/perf/arch/x86/util/intel-pt.c
+++ b/tools/perf/arch/x86/util/intel-pt.c
@@ -558,7 +558,7 @@ static int intel_pt_recording_options(struct auxtrace_record *itr,
bool have_timing_info, need_immediate = false;
struct evsel *evsel, *intel_pt_evsel = NULL;
const struct perf_cpu_map *cpus = evlist->core.cpus;
- bool privileged = geteuid() == 0 || perf_event_paranoid() < 0;
+ bool privileged = perf_event_paranoid_check(-1);
u64 tsc_bit;
int err;
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 64bc32ed6dfa..eafc134bf17c 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -279,7 +279,7 @@ struct evsel *perf_evsel__new_idx(struct perf_event_attr *attr, int idx)
static bool perf_event_can_profile_kernel(void)
{
- return geteuid() == 0 || perf_event_paranoid() == -1;
+ return perf_event_paranoid_check(-1);
}
struct evsel *perf_evsel__new_cycles(bool precise)
--
2.7.4
next prev parent reply other threads:[~2019-08-07 3:37 UTC|newest]
Thread overview: 8+ 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 ` [PATCH v2 1/4] perf: Add capability-related utilities Igor Lubashev
2019-08-07 3:35 ` Igor Lubashev [this message]
2019-08-07 11:44 ` [PATCH v2 2/4] perf: Use CAP_SYS_ADMIN with perf_event_paranoid checks Alexey Budankov
2019-08-07 11:46 ` Jiri Olsa
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 ` [PATCH v2 4/4] perf: Use CAP_SYS_ADMIN instead of euid==0 with ftrace Igor Lubashev
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