linux-kernel - [PATCH 2/3] perf: Do error out on a kernel filter on an exclude

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Message-Id: <20170126094057.13805-3-alexander.shishkin@linux.intel.com>
Date:   Thu, 26 Jan 2017 11:40:56 +0200
From:   Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:     Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:     Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        vince@...ter.net, eranian@...gle.com,
        Arnaldo Carvalho de Melo <acme@...radead.org>,
        Will Deacon <will.deacon@....com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>
Subject: [PATCH 2/3] perf: Do error out on a kernel filter on an exclude_filter event

It is currently possible to configure a kernel address filter for a
event that excludes kernel from its traces (attr.exclude_kernel==1).

While in reality this doesn't make sense, the SET_FILTER ioctl() should
return a error in such case, currently it does not. Furthermore, it
will still silently discard the filter and any potentially valid filters
that came with it.

This patch makes the SET_FILTER ioctl() error out in such cases.

Signed-off-by: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
---
 kernel/events/core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index b422b5feee..36770a13ef 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -8261,6 +8261,7 @@ perf_event_parse_addr_filter(struct perf_event *event, char *fstr,
 		 * attribute.
 		 */
 		if (state == IF_STATE_END) {
+			ret = -EINVAL;
 			if (kernel && event->attr.exclude_kernel)
 				goto fail;
 
-- 
2.11.0