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Make perf link with libcap. Signed-off-by: Igor Lubashev --- tools/perf/Makefile.config | 2 +- tools/perf/util/Build | 1 + tools/perf/util/cap.c | 24 ++++++++++++++++++++++++ tools/perf/util/cap.h | 10 ++++++++++ tools/perf/util/event.h | 1 + tools/perf/util/python-ext-sources | 1 + tools/perf/util/util.c | 9 +++++++++ 7 files changed, 47 insertions(+), 1 deletion(-) create mode 100644 tools/perf/util/cap.c create mode 100644 tools/perf/util/cap.h diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config index 85fbcd265351..21470a50ed39 100644 --- a/tools/perf/Makefile.config +++ b/tools/perf/Makefile.config @@ -259,7 +259,7 @@ CXXFLAGS += -Wno-strict-aliasing # adding assembler files missing the .GNU-stack linker note. LDFLAGS += -Wl,-z,noexecstack -EXTLIBS = -lpthread -lrt -lm -ldl +EXTLIBS = -lpthread -lrt -lm -ldl -lcap ifeq ($(FEATURES_DUMP),) include $(srctree)/tools/build/Makefile.feature diff --git a/tools/perf/util/Build b/tools/perf/util/Build index 6d5bbc8b589b..9cc6e9b34ebd 100644 --- a/tools/perf/util/Build +++ b/tools/perf/util/Build @@ -1,6 +1,7 @@ perf-y += annotate.o perf-y += block-range.o perf-y += build-id.o +perf-y += cap.o perf-y += config.o perf-y += ctype.o perf-y += db-export.o diff --git a/tools/perf/util/cap.c b/tools/perf/util/cap.c new file mode 100644 index 000000000000..c42ea32663cf --- /dev/null +++ b/tools/perf/util/cap.c @@ -0,0 +1,24 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Capability utilities + */ +#include "cap.h" +#include +#include + +bool perf_cap__capable(cap_value_t cap) +{ + cap_flag_value_t val; + cap_t caps = cap_get_proc(); + + if (!caps) + return false; + + if (cap_get_flag(caps, cap, CAP_EFFECTIVE, &val) != 0) + val = CAP_CLEAR; + + if (cap_free(caps) != 0) + return false; + + return val == CAP_SET; +} diff --git a/tools/perf/util/cap.h b/tools/perf/util/cap.h new file mode 100644 index 000000000000..5521de78b228 --- /dev/null +++ b/tools/perf/util/cap.h @@ -0,0 +1,10 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __PERF_CAP_H +#define __PERF_CAP_H + +#include +#include + +bool perf_cap__capable(cap_value_t cap); + +#endif /* __PERF_CAP_H */ diff --git a/tools/perf/util/event.h b/tools/perf/util/event.h index 9e999550f247..013d9e28fcac 100644 --- a/tools/perf/util/event.h +++ b/tools/perf/util/event.h @@ -849,6 +849,7 @@ void cpu_map_data__synthesize(struct cpu_map_data *data, struct cpu_map *map, void event_attr_init(struct perf_event_attr *attr); int perf_event_paranoid(void); +bool perf_event_paranoid_check(int max_level); extern int sysctl_perf_event_max_stack; extern int sysctl_perf_event_max_contexts_per_stack; diff --git a/tools/perf/util/python-ext-sources b/tools/perf/util/python-ext-sources index 7aa0ea64544e..4545eaf018b5 100644 --- a/tools/perf/util/python-ext-sources +++ b/tools/perf/util/python-ext-sources @@ -6,6 +6,7 @@ # util/python.c +util/cap.c util/ctype.c util/evlist.c util/evsel.c diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c index d388f80d8703..cde538ec727d 100644 --- a/tools/perf/util/util.c +++ b/tools/perf/util/util.c @@ -16,10 +16,12 @@ #include #include #include +#include #include #include #include #include +#include "cap.h" #include "strlist.h" #include "string2.h" @@ -456,6 +458,13 @@ int perf_event_paranoid(void) return value; } + +bool perf_event_paranoid_check(int max_level) +{ + return perf_cap__capable(CAP_SYS_ADMIN) || + perf_event_paranoid() <= max_level; +} + static int fetch_ubuntu_kernel_version(unsigned int *puint) { -- 2.7.4