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diff --git a/tests/sys/kern/Makefile b/tests/sys/kern/Makefile
--- a/tests/sys/kern/Makefile
+++ b/tests/sys/kern/Makefile
@@ -18,6 +18,7 @@
.if ${MK_OPENSSL} != "no"
ATF_TESTS_C+= ktls_test
.endif
+ATF_TESTS_C+= module_test
ATF_TESTS_C+= ptrace_test
TEST_METADATA.ptrace_test+= timeout="15"
ATF_TESTS_C+= reaper
diff --git a/tests/sys/kern/module_test.c b/tests/sys/kern/module_test.c
new file mode 100644
--- /dev/null
+++ b/tests/sys/kern/module_test.c
@@ -0,0 +1,197 @@
+/*-
+ * Copyright (c) 2022 University of Cambridge
+ *
+ * This software was developed by Ararat River Consulting, LLC under
+ * sponsorship from the University of Cambridge Computer Laboratory
+ * (Department of Computer Science and Technology) and Google, Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/param.h>
+#include <sys/module.h>
+#include <errno.h>
+#include <atf-c.h>
+
+ATF_TC_WITHOUT_HEAD(modfind);
+ATF_TC_BODY(modfind, tc)
+{
+ int modid;
+
+ /* This module is present in sys/kern/subr_bus.c. */
+ modid = modfind("rootbus");
+ ATF_REQUIRE(modid > 0);
+
+ modid = modfind("nonexistent_module");
+ ATF_REQUIRE(modid == -1);
+ ATF_REQUIRE(errno = ENOENT);
+}
+
+ATF_TC_WITHOUT_HEAD(modnext);
+ATF_TC_BODY(modnext, tc)
+{
+ int modid;
+
+ /* This assumes -1 is never used as a valid module id. */
+ modid = modnext(-1);
+ ATF_REQUIRE(modid == -1);
+ ATF_REQUIRE(errno = ENOENT);
+
+ modid = modnext(0);
+ ATF_REQUIRE(modid > 0);
+
+ for (;;) {
+ modid = modnext(modid);
+ ATF_REQUIRE(modid >= 0);
+ if (modid == 0)
+ break;
+ }
+}
+
+ATF_TC_WITHOUT_HEAD(modfnext);
+ATF_TC_BODY(modfnext, tc)
+{
+ int modid;
+
+ /* This assumes -1 is never used as a valid module id. */
+ modid = modfnext(-1);
+ ATF_REQUIRE(modid == -1);
+ ATF_REQUIRE(errno = ENOENT);
+
+ modid = modfnext(0);
+ ATF_REQUIRE(modid == -1);
+ ATF_REQUIRE(errno = ENOENT);
+
+ modid = modnext(0);
+ ATF_REQUIRE(modid > 0);
+
+ for (;;) {
+ modid = modfnext(modid);
+ ATF_REQUIRE(modid >= 0);
+ if (modid == 0)
+ break;
+ }
+}
+
+ATF_TC_WITHOUT_HEAD(modstat);
+ATF_TC_BODY(modstat, tc)
+{
+ struct module_stat ms;
+ int modid;
+
+ ms.version = sizeof(ms);
+ ATF_REQUIRE(modstat(0, &ms) == -1);
+ ATF_REQUIRE(errno == ENOENT);
+
+ modid = modnext(0);
+ ATF_REQUIRE(modid > 0);
+
+ ATF_REQUIRE(modstat(modid, NULL) == -1);
+ ATF_REQUIRE(errno == EFAULT);
+
+ ms.version = 0;
+ ATF_REQUIRE(modstat(modid, &ms) == -1);
+ ATF_REQUIRE(errno == EINVAL);
+
+ ms.version = sizeof(ms);
+ ATF_REQUIRE(modstat(modid, &ms) == 0);
+ ATF_REQUIRE(ms.id == modid);
+ if (strnlen(ms.name, sizeof(ms.name)) < sizeof(ms.name))
+ ATF_REQUIRE(modfind(ms.name) == modid);
+}
+
+ATF_TC_WITHOUT_HEAD(modstat_v1);
+ATF_TC_BODY(modstat_v1, tc)
+{
+ struct module_stat_v1 {
+ int version;
+ char name[32];
+ int refs;
+ int id;
+ } ms;
+ int modid;
+
+ ms.version = sizeof(ms);
+ ATF_REQUIRE(modstat(0, (struct module_stat *)&ms) == -1);
+ ATF_REQUIRE(errno == ENOENT);
+
+ modid = modnext(0);
+ ATF_REQUIRE(modid > 0);
+
+ ATF_REQUIRE(modstat(modid, NULL) == -1);
+ ATF_REQUIRE(errno == EFAULT);
+
+ ms.version = 0;
+ ATF_REQUIRE(modstat(modid, (struct module_stat *)&ms) == -1);
+ ATF_REQUIRE(errno == EINVAL);
+
+ ms.version = sizeof(ms);
+ ATF_REQUIRE(modstat(modid, (struct module_stat *)&ms) == 0);
+ ATF_REQUIRE(ms.id == modid);
+ if (strnlen(ms.name, sizeof(ms.name)) < sizeof(ms.name))
+ ATF_REQUIRE(modfind(ms.name) == modid);
+}
+
+ATF_TC_WITHOUT_HEAD(modstat_v2);
+ATF_TC_BODY(modstat_v2, tc)
+{
+ struct module_stat_v2 {
+ int version;
+ char name[32];
+ int refs;
+ int id;
+ modspecific_t data;
+ } ms;
+ int modid;
+
+ ms.version = sizeof(ms);
+ ATF_REQUIRE(modstat(0, (struct module_stat *)&ms) == -1);
+ ATF_REQUIRE(errno == ENOENT);
+
+ modid = modnext(0);
+ ATF_REQUIRE(modid > 0);
+
+ ATF_REQUIRE(modstat(modid, NULL) == -1);
+ ATF_REQUIRE(errno == EFAULT);
+
+ ms.version = 0;
+ ATF_REQUIRE(modstat(modid, (struct module_stat *)&ms) == -1);
+ ATF_REQUIRE(errno == EINVAL);
+
+ ms.version = sizeof(ms);
+ ATF_REQUIRE(modstat(modid, (struct module_stat *)&ms) == 0);
+ ATF_REQUIRE(ms.id == modid);
+ if (strnlen(ms.name, sizeof(ms.name)) < sizeof(ms.name))
+ ATF_REQUIRE(modfind(ms.name) == modid);
+}
+
+ATF_TP_ADD_TCS(tp)
+{
+ ATF_TP_ADD_TC(tp, modfind);
+ ATF_TP_ADD_TC(tp, modnext);
+ ATF_TP_ADD_TC(tp, modfnext);
+ ATF_TP_ADD_TC(tp, modstat);
+ ATF_TP_ADD_TC(tp, modstat_v1);
+ ATF_TP_ADD_TC(tp, modstat_v2);
+
+ return (atf_no_error());
+}

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