Commit 7d173913 authored May 12, 2016 by Arnaldo Carvalho de Melo

perf evsel: Improve EPERM error handling in open_strerror()



We were showing a hardcoded default value for the kernel.perf_event_paranoid
sysctl, now that it became more paranoid (1 -> 2 [1]), this would need to be
updated, instead show the current value:

  [acme@jouet linux]$ perf record ls
  Error:
  You may not have permission to collect stats.

  Consider tweaking /proc/sys/kernel/perf_event_paranoid,
  which controls use of the performance events system by
  unprivileged users (without CAP_SYS_ADMIN).

  The current value is 2:

    -1: Allow use of (almost) all events by all users
  >= 0: Disallow raw tracepoint access by users without CAP_IOC_LOCK
  >= 1: Disallow CPU event access by users without CAP_SYS_ADMIN
  >= 2: Disallow kernel profiling by users without CAP_SYS_ADMIN
  [acme@jouet linux]$

[1] 0161028b ("perf/core: Change the default paranoia level to 2")

Reported-by: Ingo Molnar <mingo@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-0gc4rdpg8d025r5not8s8028@git.kernel.org


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

parent 106b816c

tools/perf/util/evsel.c

+3 −2

Original line number	Diff line number	Diff line
		@@ -2382,12 +2382,13 @@ int perf_evsel__open_strerror(struct perf_evsel evsel, struct target target,
		"Consider tweaking /proc/sys/kernel/perf_event_paranoid,\n"
		"which controls use of the performance events system by\n"
		"unprivileged users (without CAP_SYS_ADMIN).\n\n"
		"The default value is 1:\n\n"
		"The current value is %d:\n\n"
		" -1: Allow use of (almost) all events by all users\n"
		">= 0: Disallow raw tracepoint access by users without CAP_IOC_LOCK\n"
		">= 1: Disallow CPU event access by users without CAP_SYS_ADMIN\n"
		">= 2: Disallow kernel profiling by users without CAP_SYS_ADMIN",
		target->system_wide ? "system-wide " : "");
		target->system_wide ? "system-wide " : "",
		perf_event_paranoid());
		case ENOENT:
		return scnprintf(msg, size, "The %s event is not supported.",
		perf_evsel__name(evsel));

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