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| author | Ingo Molnar <mingo@elte.hu> | 2009-09-13 15:33:44 (GMT) |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-09-13 15:33:44 (GMT) |
| commit | 459ec28ab404d7afcd512ce9b855959ad301605a (patch) | |
| tree | 5c17a0f919242bafffd29cea65a62139a34c2aeb | |
| parent | 1fc35b29b4098aa3bf9fc9acb4c1615d0b5dd95d (diff) | |
| download | linux-459ec28ab404d7afcd512ce9b855959ad301605a.tar.xz | |
perf_counter: Allow mmap if paranoid checks are turned off
Before:
$ perf sched record -f sleep 1
Error: failed to mmap with 1 (Operation not permitted)
After:
$ perf sched record -f sleep 1
[ perf record: Captured and wrote 0.095 MB perf.data (~4161 samples) ]
Note, this is only allowed if perfcounter_paranoid is set to
the most permissive (non-default) value of -1.
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>
| -rw-r--r-- | kernel/perf_counter.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c index e0d91fd..667ab25 100644 --- a/kernel/perf_counter.c +++ b/kernel/perf_counter.c @@ -2315,7 +2315,8 @@ static int perf_mmap(struct file *file, struct vm_area_struct *vma) lock_limit >>= PAGE_SHIFT; locked = vma->vm_mm->locked_vm + extra; - if ((locked > lock_limit) && !capable(CAP_IPC_LOCK)) { + if ((locked > lock_limit) && perf_paranoid_tracepoint_raw() && + !capable(CAP_IPC_LOCK)) { ret = -EPERM; goto unlock; } |