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authorAlexey Budankov <alexey.budankov@linux.intel.com>2020-08-05 09:31:20 +0200
committerArnaldo Carvalho de Melo <acme@redhat.com>2020-08-06 14:04:23 +0200
commit4b0297ef8a4ecd56ec105e49752d1378e4f8a2f4 (patch)
tree770c445f39e7ca4af40aa80affe99ad1769153b8 /tools/perf
parentperf intel-pt: Add support for decoding PSB+ only (diff)
downloadlinux-4b0297ef8a4ecd56ec105e49752d1378e4f8a2f4.tar.xz
linux-4b0297ef8a4ecd56ec105e49752d1378e4f8a2f4.zip
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.c6
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"