[PATCH v4 3/5] powerpc/perf: Add privileged access check for thread_imc

[Anju T Sudhakar]

From: Madhavan Srinivasan <ma...@linux.vnet.ibm.com>

Add code to restrict user access to thread_imc pmu since
some event report privilege level information.

Fixes: f74c89bd80fb3 ('powerpc/perf: Add thread IMC PMU support')
Signed-off-by: Madhavan Srinivasan <ma...@linux.vnet.ibm.com>
Signed-off-by: Anju T Sudhakar <a...@linux.vnet.ibm.com>
---
 arch/powerpc/perf/imc-pmu.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/powerpc/perf/imc-pmu.c b/arch/powerpc/perf/imc-pmu.c
index 51f1d3eaaa6d..7fe258e17dfe 100644
--- a/arch/powerpc/perf/imc-pmu.c
+++ b/arch/powerpc/perf/imc-pmu.c
@@ -859,6 +859,9 @@ static int thread_imc_event_init(struct perf_event *event)
        if (event->attr.type != event->pmu->type)
                return -ENOENT;
 
+       if (!capable(CAP_SYS_ADMIN))
+               return -EACCES;
+
        /* Sampling not supported */
        if (event->hw.sample_period)
                return -EINVAL;
-- 
2.17.2