linux-kernel - [PATCH] perf: Start rejecting the syscall with attr.__reserved

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Message-Id: <20191025121636.75182-1-alexander.shishkin@linux.intel.com>
Date:   Fri, 25 Oct 2019 15:16:36 +0300
From:   Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Arnaldo Carvalho de Melo <acme@...hat.com>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        jolsa@...hat.com, adrian.hunter@...el.com,
        mathieu.poirier@...aro.org, mark.rutland@....com,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: [PATCH] perf: Start rejecting the syscall with attr.__reserved_2 set

Commit

  1a5941312414c ("perf: Add wakeup watermark control to the AUX area")

added attr.__reserved_2 padding, but forgot to add an ABI check to reject
attributes with this field set. Fix that.

Signed-off-by: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
---
 kernel/events/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 77793ef0d8bc..0940c8810be0 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -10660,7 +10660,7 @@ static int perf_copy_attr(struct perf_event_attr __user *uattr,
 
 	attr->size = size;
 
-	if (attr->__reserved_1)
+	if (attr->__reserved_1 || attr->__reserved_2)
 		return -EINVAL;
 
 	if (attr->sample_type & ~(PERF_SAMPLE_MAX-1))
-- 
2.23.0