powerpc/perf: Add privileged access check for thread_imc

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 <maddy@linux.vnet.ibm.com>
Signed-off-by: Anju T Sudhakar <anju@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/perf/imc-pmu.c b/arch/powerpc/perf/imc-pmu.c
index 23092a3..975837d 100644 (file)
--- a/arch/powerpc/perf/imc-pmu.c
+++ b/arch/powerpc/perf/imc-pmu.c
@@ -864,6 +864,9 @@ 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;