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| author | Alexey Budankov <alexey.budankov@linux.intel.com> | 2020-08-05 10:31:20 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2020-08-06 15:04:23 +0300 |
| commit | 4b0297ef8a4ecd56ec105e49752d1378e4f8a2f4 (patch) | |
| tree | 770c445f39e7ca4af40aa80affe99ad1769153b8 /tools/perf | |
| parent | 347a7389a7cc9b91f80deb8d7043e9827d08b328 (diff) | |
| download | linux-4b0297ef8a4ecd56ec105e49752d1378e4f8a2f4.tar.xz | |
perf evsel: Extend message to mention CAP_SYS_PTRACE and perf security doc link
Adjust limited access message to mention CAP_SYS_PTRACE capability for
processes of unprivileged users. Add link to perf security document in
the end of the section about capabilities.
The change has been inspired by this discussion:
https://lore.kernel.org/lkml/20200722113007.GI77866@kernel.org/
Signed-off-by: Alexey Budankov <alexey.budankov@linux.intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/6f8a7425-6e7d-19aa-1605-e59836b9e2a6@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf')
| -rw-r--r-- | tools/perf/util/evsel.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index b1845f799d81..fd865002cbbd 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -2502,8 +2502,10 @@ int evsel__open_strerror(struct evsel *evsel, struct target *target, return scnprintf(msg + printed, size - printed, "Consider adjusting /proc/sys/kernel/perf_event_paranoid setting to open\n" - "access to performance monitoring and observability operations for users\n" - "without CAP_PERFMON or CAP_SYS_ADMIN Linux capability.\n" + "access to performance monitoring and observability operations for processes\n" + "without CAP_PERFMON, CAP_SYS_PTRACE or CAP_SYS_ADMIN Linux capability.\n" + "More information can be found at 'Perf events and tool security' document:\n" + "https://www.kernel.org/doc/html/latest/admin-guide/perf-security.html\n" "perf_event_paranoid setting is %d:\n" " -1: Allow use of (almost) all events by all users\n" " Ignore mlock limit after perf_event_mlock_kb without CAP_IPC_LOCK\n" |