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| author | Ingo Molnar <mingo@elte.hu> | 2009-09-02 21:46:00 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-09-02 21:53:02 +0200 |
| commit | 0fbdea19e9394a5cb5f2f5081b028c50b558910a (patch) | |
| tree | c3eae68d53504ed1f1615dcb7b5de58ce5d6ff98 /kernel/perf_counter.c | |
| parent | f76bd108e5031202bb40849306f98c4afebe4ef6 (diff) | |
| download | kernel_samsung_smdk4412-0fbdea19e9394a5cb5f2f5081b028c50b558910a.zip kernel_samsung_smdk4412-0fbdea19e9394a5cb5f2f5081b028c50b558910a.tar.gz kernel_samsung_smdk4412-0fbdea19e9394a5cb5f2f5081b028c50b558910a.tar.bz2 | |
perf_counter: Introduce new (non-)paranoia level to allow raw tracepoint access
I want to sample inherited tracepoint workloads as a normal
user and the CAP_SYS_ADMIN check prevents me from doing that
right now.
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/perf_counter.c')
| -rw-r--r-- | kernel/perf_counter.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c index d988dfb4..0aa609f 100644 --- a/kernel/perf_counter.c +++ b/kernel/perf_counter.c @@ -46,12 +46,18 @@ static atomic_t nr_task_counters __read_mostly; /* * perf counter paranoia level: - * 0 - not paranoid - * 1 - disallow cpu counters to unpriv - * 2 - disallow kernel profiling to unpriv + * -1 - not paranoid at all + * 0 - disallow raw tracepoint access for unpriv + * 1 - disallow cpu counters for unpriv + * 2 - disallow kernel profiling for unpriv */ int sysctl_perf_counter_paranoid __read_mostly = 1; +static inline bool perf_paranoid_tracepoint_raw(void) +{ + return sysctl_perf_counter_paranoid > -1; +} + static inline bool perf_paranoid_cpu(void) { return sysctl_perf_counter_paranoid > 0; @@ -3971,6 +3977,7 @@ static const struct pmu *tp_perf_counter_init(struct perf_counter *counter) * have these. */ if ((counter->attr.sample_type & PERF_SAMPLE_RAW) && + perf_paranoid_tracepoint_raw() && !capable(CAP_SYS_ADMIN)) return ERR_PTR(-EPERM); |