linux-kernel - [PATCH 03/10] arm: perf: add additional validation to set_event

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Date:   Fri, 16 Nov 2018 10:24:06 +0000
From:   Andrew Murray <andrew.murray@....com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Will Deacon <will.deacon@....com>,
        Mark Rutland <mark.rutland@....com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>, x86@...nel.org
Cc:     linux-alpha@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 03/10] arm: perf: add additional validation to set_event_filter

The armv7pmu driver doesn't support host/guest mode exclusion so
let's report this when set_event_filter is called with these
exclusion flags set.

Signed-off-by: Andrew Murray <andrew.murray@....com>
---
 arch/arm/kernel/perf_event_v7.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/kernel/perf_event_v7.c b/arch/arm/kernel/perf_event_v7.c
index a4fb0f8..c4c9fbb 100644
--- a/arch/arm/kernel/perf_event_v7.c
+++ b/arch/arm/kernel/perf_event_v7.c
@@ -1074,6 +1074,8 @@ static int armv7pmu_set_event_filter(struct hw_perf_event *event,
 
 	if (attr->exclude_idle)
 		return -EPERM;
+	if (attr->exclude_host || attr->exclude_guest)
+		return -EPERM;
 	if (attr->exclude_user)
 		config_base |= ARMV7_EXCLUDE_USER;
 	if (attr->exclude_kernel)
-- 
2.7.4