1 files changed, 83 insertions, 0 deletions
diff --git a/tools/testing/selftests/futex/functional/futex_wait_uninitialized_heap.c b/tools/testing/selftests/futex/functional/futex_wait_uninitialized_heap.c
new file mode 100644
index 000000000000..b07d68a67f31
--- /dev/null
+++ b/tools/testing/selftests/futex/functional/futex_wait_uninitialized_heap.c
@@ -0,0 +1,83 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/******************************************************************************
+ *
+ * Copyright FUJITSU LIMITED 2010
+ * Copyright KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
+ *
+ * DESCRIPTION
+ *      Wait on uninitialized heap. It shold be zero and FUTEX_WAIT should
+ *      return immediately. This test is intent to test zero page handling in
+ *      futex.
+ *
+ * AUTHOR
+ *      KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
+ *
+ * HISTORY
+ *      2010-Jan-6: Initial version by KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
+ *
+ *****************************************************************************/
+
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <syscall.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <errno.h>
+#include <linux/futex.h>
+#include <libgen.h>
+
+#include "futextest.h"
+#include "kselftest_harness.h"
+
+#define WAIT_US 5000000
+
+static int child_blocked = 1;
+static bool child_ret;
+void *buf;
+
+void *wait_thread(void *arg)
+{
+	int res;
+
+	child_ret = true;
+	res = futex_wait(buf, 1, NULL, 0);
+	child_blocked = 0;
+
+	if (res != 0 && errno != EWOULDBLOCK) {
+		ksft_exit_fail_msg("futex failure\n");
+		child_ret = false;
+	}
+	pthread_exit(NULL);
+}
+
+TEST(futex_wait_uninitialized_heap)
+{
+	long page_size;
+	pthread_t thr;
+	int ret;
+
+	page_size = sysconf(_SC_PAGESIZE);
+
+	buf = mmap(NULL, page_size, PROT_READ|PROT_WRITE,
+		   MAP_PRIVATE|MAP_ANONYMOUS, 0, 0);
+	if (buf == (void *)-1)
+		ksft_exit_fail_msg("mmap\n");
+
+	ret = pthread_create(&thr, NULL, wait_thread, NULL);
+	if (ret)
+		ksft_exit_fail_msg("pthread_create\n");
+
+	ksft_print_dbg_msg("waiting %dus for child to return\n", WAIT_US);
+	usleep(WAIT_US);
+
+	if (child_blocked)
+		ksft_test_result_fail("child blocked in kernel\n");
+
+	if (!child_ret)
+		ksft_test_result_fail("child error\n");
+}
+
+TEST_HARNESS_MAIN