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perf evsel: Extend message to mention CAP_SYS_PTRACE and perf security doc link

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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>
This commit is contained in:
Alexey Budankov 2020-08-05 10:31:20 +03:00 committed by Arnaldo Carvalho de Melo
parent 347a7389a7
commit 4b0297ef8a
1 changed files with 4 additions and 2 deletions
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6
tools/perf/util/evsel.c
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@ -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"