linux-kernel - [PATCH 1/2] selftests: futex: Make futex_waitv's invalid clockid test more robust

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Date:   Thu, 28 Oct 2021 16:29:35 -0300
From:   André Almeida <andrealmeid@...labora.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Darren Hart <dvhart@...radead.org>,
        linux-kernel@...r.kernel.org, Davidlohr Bueso <dave@...olabs.net>
Cc:     André Almeida <andrealmeid@...labora.com>
Subject: [PATCH 1/2] selftests: futex: Make futex_waitv's invalid clockid test more robust

If we use NULL for *waiters, we may be triggering a different error
path. Use a valid value for this arguments to make sure that the invalid
clockid is the one triggering the EINVAL return.

Signed-off-by: André Almeida <andrealmeid@...labora.com>
---
 tools/testing/selftests/futex/functional/futex_waitv.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/futex/functional/futex_waitv.c b/tools/testing/selftests/futex/functional/futex_waitv.c
index a94337f677e1..336b04dacd0e 100644
--- a/tools/testing/selftests/futex/functional/futex_waitv.c
+++ b/tools/testing/selftests/futex/functional/futex_waitv.c
@@ -217,12 +217,17 @@ int main(int argc, char *argv[])
 	}
 
 	/* Testing an invalid clockid */
+	waitv[0].uaddr = (uintptr_t)&futexes[0];
+	waitv[0].flags = FUTEX_PRIVATE_FLAG | FUTEX_32;
+	waitv[0].val = 0;
+	waitv[0].__reserved = 0;
+
 	if (clock_gettime(CLOCK_MONOTONIC, &to))
 		error("gettime64 failed\n", errno);
 
 	to.tv_sec++;
 
-	res = futex_waitv(NULL, NR_FUTEXES, 0, &to, CLOCK_TAI);
+	res = futex_waitv(waitv, 1, 0, &to, CLOCK_TAI);
 	if (res == EINVAL) {
 		ksft_test_result_fail("futex_waitv private returned: %d %s\n",
 				      res ? errno : res,
-- 
2.33.1