From 72252591ac01037fa53501adb88f00d5d3cc09ed Mon Sep 17 00:00:00 2001
From: Konstantin Belousov <kib@FreeBSD.org>
Date: Mon, 30 Mar 2026 03:42:00 +0300
Subject: [PATCH] rtld: add test for dlopen("#dirfd/path")

Reviewed by:	markj
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential revision:	 https://reviews.freebsd.org/D56152
---
 libexec/rtld-elf/tests/Makefile           |  1 +
 libexec/rtld-elf/tests/dlopen_hash_test.c | 45 +++++++++++++++++++++++
 2 files changed, 46 insertions(+)
 create mode 100644 libexec/rtld-elf/tests/dlopen_hash_test.c

diff --git a/libexec/rtld-elf/tests/Makefile b/libexec/rtld-elf/tests/Makefile
index 3c05b52b83b..4fbc32d8761 100644
--- a/libexec/rtld-elf/tests/Makefile
+++ b/libexec/rtld-elf/tests/Makefile
@@ -14,6 +14,7 @@ SRCS.$t=	$t.c common.c
 .endfor
 
 ATF_TESTS_C+=	dlopen_test
+ATF_TESTS_C+=	dlopen_hash_test
 
 WARNS?=		3
 
diff --git a/libexec/rtld-elf/tests/dlopen_hash_test.c b/libexec/rtld-elf/tests/dlopen_hash_test.c
new file mode 100644
index 00000000000..a95ebdb3438
--- /dev/null
+++ b/libexec/rtld-elf/tests/dlopen_hash_test.c
@@ -0,0 +1,45 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2026 Alex S <iwtcex@gmail.com>
+ * Copyright 2026 The FreeBSD Foundation
+ *
+ * Portions of this software were developed by
+ * Konstantin Belousov <kib@FreeBSD.org> under sponsorship from
+ * the FreeBSD Foundation.
+ */
+
+#include <atf-c.h>
+#include <dlfcn.h>
+#include <fcntl.h>
+#include <link.h>
+#include <stdio.h>
+
+ATF_TC_WITHOUT_HEAD(dlopen_hash);
+ATF_TC_BODY(dlopen_hash, tc)
+{
+	void *handle;
+	char *pathfds;
+	char *name;
+	int testdir;
+
+	handle = dlopen("libpythagoras.so.0", RTLD_LAZY);
+	ATF_REQUIRE(handle == NULL);
+
+	testdir = open(atf_tc_get_config_var(tc, "srcdir"),
+	    O_RDONLY | O_DIRECTORY);
+	ATF_REQUIRE(testdir >= 0);
+
+	ATF_REQUIRE(asprintf(&pathfds, "%d", testdir) > 0);
+	ATF_REQUIRE(rtld_set_var("LIBRARY_PATH_FDS", pathfds) == 0);
+
+	ATF_REQUIRE(asprintf(&name, "#%d/libpythagoras.so.0", testdir) > 0);
+	handle = dlopen(name,  RTLD_LAZY);
+	ATF_REQUIRE(handle != NULL);
+}
+
+ATF_TP_ADD_TCS(tp)
+{
+	ATF_TP_ADD_TC(tp, dlopen_hash);
+	return atf_no_error();
+}