On Wed, 6 Nov 2013 09:46:49 -0500
Steven Rostedt <[email protected]> wrote:
>
> As I usually send you signed tag pull releases, I made one of those too:
>
>
I just included Vince's tested-by tag. Here's a new tag you can pull.
-- Steve
Linus,
Please pull the latest ftrace-urgent-3.12-v2 tree, which can be found at:
git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
ftrace-urgent-3.12-v2
Tag SHA1: 84665f63eaea429fc56c9bc8c1b4e2da1ed697d5
Head SHA1: 12ae030d54ef250706da5642fc7697cc60ad0df7
Steven Rostedt (1):
perf/ftrace: Fix paranoid level for enabling function tracer
----
kernel/trace/trace_event_perf.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
---------------------------
commit 12ae030d54ef250706da5642fc7697cc60ad0df7
Author: Steven Rostedt <[email protected]>
Date: Tue Nov 5 12:51:11 2013 -0500
perf/ftrace: Fix paranoid level for enabling function tracer
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 <[email protected]>
Reported-by: Vince Weaver <[email protected]>
Tested-by: Vince Weaver <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: [email protected] # 3.4+
CVE: CVE-2013-2930
Fixes: ced39002f5ea ("ftrace, perf: Add support to use function tracepoint
in perf")
Signed-off-by: Steven Rostedt <[email protected]>
diff --git a/kernel/trace/trace_event_perf.c b/kernel/trace/trace_event_perf.c
index 80c36bc..78e27e3 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 */
--
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