process-util: also disable dlopen() in safe_fork()

src/test/test-execute.c

@@ -20,6 +20,7 @@
 #include "fd-util.h"
 #include "fileio.h"
 #include "fs-util.h"
+#include "libmount-util.h"
 #include "manager.h"
 #include "mkdir.h"
 #include "mount-util.h"
@@ -1604,6 +1605,8 @@ TEST(run_tests_unprivileged) {
 }
 
 static int intro(void) {
+        int r;
+
 #if HAS_FEATURE_ADDRESS_SANITIZER
         if (strstr_ptr(ci_environment(), "travis") || strstr_ptr(ci_environment(), "github-actions"))
                 return log_tests_skipped("Running on Travis CI/GH Actions under ASan, see https://github.com/systemd/systemd/issues/10696");
@@ -1621,6 +1624,10 @@ static int intro(void) {
         if (path_is_read_only_fs("/sys") > 0)
                 return log_tests_skipped("/sys is mounted read-only");
 
+        r = dlopen_libmount();
+        if (r < 0)
+                return log_tests_skipped("libmount not available.");
+
         /* Create dummy network interface for testing PrivateNetwork=yes */
         have_net_dummy = system("ip link add dummy-test-exec type dummy") == 0;