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Sender: Namhyung Kim <namhyung@gmail.com>
From:   Namhyung Kim <namhyung@kernel.org>
To:     Peter Zijlstra <peterz@infradead.org>
Cc:     Ingo Molnar <mingo@kernel.org>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Jiri Olsa <jolsa@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Stephane Eranian <eranian@google.com>,
        Andi Kleen <ak@linux.intel.com>,
        Ian Rogers <irogers@google.com>,
        James Morris <jmorris@namei.org>,
        Joel Fernandes <joel@joelfernandes.org>
Subject: [PATCH] perf/core: Call LSM hook after copying perf_event_attr
Date:   Thu,  2 Jun 2022 15:47:54 -0700
Message-Id: <20220602224754.602074-1-namhyung@kernel.org>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

It passes the attr struct to the security_perf_event_open() but it's
not initialized yet.

Fixes: da97e18458fb ("perf_event: Add support for LSM and SELinux checks")
Cc: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 kernel/events/core.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 7858bafffa9d..e035545f624f 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -12033,12 +12033,12 @@ SYSCALL_DEFINE5(perf_event_open,
 	if (flags & ~PERF_FLAG_ALL)
 		return -EINVAL;
 
-	/* Do we allow access to perf_event_open(2) ? */
-	err = security_perf_event_open(&attr, PERF_SECURITY_OPEN);
+	err = perf_copy_attr(attr_uptr, &attr);
 	if (err)
 		return err;
 
-	err = perf_copy_attr(attr_uptr, &attr);
+	/* Do we allow access to perf_event_open(2) ? */
+	err = security_perf_event_open(&attr, PERF_SECURITY_OPEN);
 	if (err)
 		return err;
 
-- 
2.36.1.255.ge46751e96f-goog