1 files changed, 72 insertions, 0 deletions
diff --git a/src/kernel/tests/include/lapi/openat2.h b/src/kernel/tests/include/lapi/openat2.h
new file mode 100644
index 0000000..62da1a0
--- /dev/null
+++ b/src/kernel/tests/include/lapi/openat2.h
@@ -0,0 +1,72 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (c) 2020 Linaro Limited. All rights reserved.
+ * Author: Viresh Kumar <viresh.kumar@linaro.org>
+ */
+
+#ifndef OPENAT2_H
+#define OPENAT2_H
+
+#include <sys/syscall.h>
+#include <linux/types.h>
+
+#include "lapi/syscalls.h"
+
+#include "config.h"
+
+#ifndef HAVE_OPENAT2
+/*
+ * Arguments for how openat2(2) should open the target path. If only @flags and
+ * @mode are non-zero, then openat2(2) operates very similarly to openat(2).
+ *
+ * However, unlike openat(2), unknown or invalid bits in @flags result in
+ * -EINVAL rather than being silently ignored. @mode must be zero unless one of
+ * {O_CREAT, O_TMPFILE} are set.
+ *
+ * @flags: O_* flags.
+ * @mode: O_CREAT/O_TMPFILE file mode.
+ * @resolve: RESOLVE_* flags.
+ */
+struct open_how {
+	uint64_t flags;
+	uint64_t mode;
+	uint64_t resolve;
+};
+
+/* how->resolve flags for openat2(2). */
+#define RESOLVE_NO_XDEV		0x01 /* Block mount-point crossings
+					(includes bind-mounts). */
+#define RESOLVE_NO_MAGICLINKS	0x02 /* Block traversal through procfs-style
+					"magic-links". */
+#define RESOLVE_NO_SYMLINKS	0x04 /* Block traversal through all symlinks
+					(implies OEXT_NO_MAGICLINKS) */
+#define RESOLVE_BENEATH		0x08 /* Block "lexical" trickery like
+					"..", symlinks, and absolute
+					paths which escape the dirfd. */
+#define RESOLVE_IN_ROOT		0x10 /* Make all jumps to "/" and ".."
+					be scoped inside the dirfd
+					(similar to chroot(2)). */
+
+int openat2(int dfd, const char *pathname, struct open_how *how, size_t size)
+{
+	return tst_syscall(__NR_openat2, dfd, pathname, how, size);
+}
+#endif
+
+struct open_how_pad {
+	/* how should be kept as the first entry here */
+	struct open_how how;
+	uint64_t pad;
+};
+
+void openat2_supported_by_kernel(void)
+{
+	if ((tst_kvercmp(5, 6, 0)) < 0) {
+		/* Check if the syscall is backported on an older kernel */
+		TEST(syscall(__NR_openat2, -1, NULL, NULL, 0));
+		if (TST_RET == -1 && TST_ERR == ENOSYS)
+			tst_brk(TCONF, "Test not supported on kernel version < v5.6");
+	}
+}
+
+#endif /* OPENAT2_H */