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c22e150e3a
Add utilities to help checking capabilities of the running procss. Make perf link with libcap, if it is available. If no libcap-dev[el], fallback to the geteuid() == 0 test used before. Committer notes: $ perf test python 18: 'import perf' in python : FAILED! $ perf test -v python Couldn't bump rlimit(MEMLOCK), failures may take place when creating BPF maps, etc 18: 'import perf' in python : --- start --- test child forked, pid 23288 Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: /tmp/build/perf/python/perf.so: undefined symbol: cap_get_flag test child finished with -1 ---- end ---- 'import perf' in python: FAILED! $ This happens because differently from the perf binary generated with this patch applied: $ ldd /tmp/build/perf/perf | grep libcap libcap.so.2 => /lib64/libcap.so.2 (0x00007f724a4ef000) $ The python binding isn't linking with libcap: $ ldd /tmp/build/perf/python/perf.so | grep libcap $ So add 'cap' to the 'extra_libraries' variable in tools/perf/util/setup.py, and rebuild: $ perf test python 18: 'import perf' in python : Ok $ If we explicitely disable libcap it also continues to work: $ make NO_LIBCAP=1 -C tools/perf O=/tmp/build/perf install-bin $ ldd /tmp/build/perf/perf | grep libcap $ ldd /tmp/build/perf/python/perf.so | grep libcap $ perf test python 18: 'import perf' in python : Ok $ 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 [ split from a larger patch ] Link: http://lkml.kernel.org/r/8a1e76cf5c7c9796d0d4d240fbaa85305298aafa.1565188228.git.ilubashe@akamai.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
30 lines
468 B
C
30 lines
468 B
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Capability utilities
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*/
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#ifdef HAVE_LIBCAP_SUPPORT
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#include "cap.h"
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#include <stdbool.h>
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#include <sys/capability.h>
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bool perf_cap__capable(cap_value_t cap)
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{
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cap_flag_value_t val;
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cap_t caps = cap_get_proc();
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if (!caps)
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return false;
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if (cap_get_flag(caps, cap, CAP_EFFECTIVE, &val) != 0)
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val = CAP_CLEAR;
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if (cap_free(caps) != 0)
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return false;
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return val == CAP_SET;
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}
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#endif /* HAVE_LIBCAP_SUPPORT */
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