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authorIngo Molnar <mingo@elte.hu>2009-09-13 17:33:44 +0200
committerIngo Molnar <mingo@elte.hu>2009-09-13 17:33:44 +0200
commit459ec28ab404d7afcd512ce9b855959ad301605a (patch)
tree5c17a0f919242bafffd29cea65a62139a34c2aeb /kernel
parent1fc35b29b4098aa3bf9fc9acb4c1615d0b5dd95d (diff)
downloadop-kernel-dev-459ec28ab404d7afcd512ce9b855959ad301605a.zip
op-kernel-dev-459ec28ab404d7afcd512ce9b855959ad301605a.tar.gz
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>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/perf_counter.c3
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;
}
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