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| author | Peter Zijlstra | 2009-04-09 10:53:45 +0200 |
|---|---|---|
| committer | Ingo Molnar | 2009-04-09 11:50:52 +0200 |
| commit | 1ccd15497869f3ed83b5225d410df53a96e52757 (patch) | |
| tree | 67c475136503f53c2b2d9d9ada1c281aef0a162b /kernel/perf_counter.c | |
| parent | perf_counter: optimize mmap/comm tracking (diff) | |
| download | kernel-qcow2-linux-1ccd15497869f3ed83b5225d410df53a96e52757.tar.gz kernel-qcow2-linux-1ccd15497869f3ed83b5225d410df53a96e52757.tar.xz kernel-qcow2-linux-1ccd15497869f3ed83b5225d410df53a96e52757.zip | |
perf_counter: sysctl for system wide perf counters
Impact: add sysctl for paranoid/relaxed perfcounters policy
Allow the use of system wide perf counters to everybody, but provide
a sysctl to disable it for the paranoid security minded.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
LKML-Reference: <20090409085524.514046352@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/perf_counter.c')
| -rw-r--r-- | kernel/perf_counter.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c index 76376ecb23b5..7efb7ebaaae0 100644 --- a/kernel/perf_counter.c +++ b/kernel/perf_counter.c @@ -42,6 +42,8 @@ static atomic_t nr_mmap_tracking __read_mostly; static atomic_t nr_munmap_tracking __read_mostly; static atomic_t nr_comm_tracking __read_mostly; +int sysctl_perf_counter_priv __read_mostly; /* do we need to be privileged */ + /* * Mutex for (sysadmin-configurable) counter reservations: */ @@ -1132,7 +1134,7 @@ static struct perf_counter_context *find_get_context(pid_t pid, int cpu) */ if (cpu != -1) { /* Must be root to operate on a CPU counter: */ - if (!capable(CAP_SYS_ADMIN)) + if (sysctl_perf_counter_priv && !capable(CAP_SYS_ADMIN)) return ERR_PTR(-EACCES); if (cpu < 0 || cpu > num_possible_cpus()) |