linux-kernel - [PATCH v4 3/5] powerpc/perf: Add privileged access check for thread

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Date:   Tue, 16 Apr 2019 15:18:29 +0530
From:   Anju T Sudhakar <anju@...ux.vnet.ibm.com>
To:     mpe@...erman.id.au
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        maddy@...ux.vnet.ibm.com, anju@...ux.vnet.ibm.com
Subject: [PATCH v4 3/5] powerpc/perf: Add privileged access check for thread_imc

From: Madhavan Srinivasan <maddy@...ux.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 <maddy@...ux.vnet.ibm.com>
Signed-off-by: Anju T Sudhakar <anju@...ux.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