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e25ebda78e
Remove dependence on libcap. libcap is only used to query whether a capability is supported, which is just 1 capget system call. If the capget system call fails, fall back on root permission checking. Previously if libcap fails then the permission is assumed not present which may be pessimistic/wrong. Add a used_root out argument to perf_cap__capable to say whether the fall back root check was used. This allows the correct error message, "root" vs "users with the CAP_PERFMON or CAP_SYS_ADMIN capability", to be selected. Tidy uses of perf_cap__capable so that tests aren't repeated if capget isn't supported. Signed-off-by: Ian Rogers <irogers@google.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com> Cc: Changbin Du <changbin.du@huawei.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Clark <james.clark@arm.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Kan Liang <kan.liang@linux.intel.com> Cc: Leo Yan <leo.yan@linux.dev> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Oliver Upton <oliver.upton@linux.dev> Cc: Peter Zijlstra <peterz@infradead.org> Link: https://lore.kernel.org/r/20240806220614.831914-1-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
20 lines
401 B
C
20 lines
401 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __PERF_CAP_H
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#define __PERF_CAP_H
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#include <stdbool.h>
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/* For older systems */
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#ifndef CAP_SYSLOG
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#define CAP_SYSLOG 34
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#endif
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#ifndef CAP_PERFMON
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#define CAP_PERFMON 38
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#endif
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/* Query if a capability is supported, used_root is set if the fallback root check was used. */
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bool perf_cap__capable(int cap, bool *used_root);
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#endif /* __PERF_CAP_H */
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