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authorSteven Rostedt <rostedt@goodmis.org>2013-11-05 12:51:11 -0500
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-11-29 11:11:43 -0800
commit65b4037862eeec836fef612bbcd558ea10efe1a8 (patch)
tree48de155107eb0290a12dc74a1c57107505625b78 /kernel
parent1b81dc5b7eead5d1112c4042a41339493f71ddeb (diff)
perf/ftrace: Fix paranoid level for enabling function tracer
commit 12ae030d54ef250706da5642fc7697cc60ad0df7 upstream. The current default perf paranoid level is "1" which has "perf_paranoid_kernel()" return false, and giving any operations that use it, access to normal users. Unfortunately, this includes function tracing and normal users should not be allowed to enable function tracing by default. The proper level is defined at "-1" (full perf access), which "perf_paranoid_tracepoint_raw()" will only give access to. Use that check instead for enabling function tracing. Reported-by: Dave Jones <davej@redhat.com> Reported-by: Vince Weaver <vincent.weaver@maine.edu> Tested-by: Vince Weaver <vincent.weaver@maine.edu> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> CVE: CVE-2013-2930 Fixes: ced39002f5ea ("ftrace, perf: Add support to use function tracepoint in perf") Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/trace/trace_event_perf.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/trace/trace_event_perf.c b/kernel/trace/trace_event_perf.c
index 84b1e045faba..8354dc81ae64 100644
--- a/kernel/trace/trace_event_perf.c
+++ b/kernel/trace/trace_event_perf.c
@@ -26,7 +26,7 @@ static int perf_trace_event_perm(struct ftrace_event_call *tp_event,
{
/* The ftrace function trace is allowed only for root. */
if (ftrace_event_is_function(tp_event) &&
- perf_paranoid_kernel() && !capable(CAP_SYS_ADMIN))
+ perf_paranoid_tracepoint_raw() && !capable(CAP_SYS_ADMIN))
return -EPERM;
/* No tracing, just counting, so no obvious leak */