Ignore symbols of imported libs' dependencies
When a library is present in a namespace via the secondary_namespaces
list (i.e. the executable, LD_PRELOAD, DF_1_GLOBAL, or
android_create_namespace inheritance), then we want to search that
library's symbols, but not the symbols of its dependencies. Otherwise,
we want to search the dependencies to handle cross-NS dependency.
Bug: http://b/148569846
Test: bionic unit tests
Change-Id: If798d69de28ed5c0f1a155e4ff85c7e08934e531
diff --git a/tests/libs/ns_hidden_child_helper.cpp b/tests/libs/ns_hidden_child_helper.cpp
new file mode 100644
index 0000000..c2140f1
--- /dev/null
+++ b/tests/libs/ns_hidden_child_helper.cpp
@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * 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 COPYRIGHT HOLDERS 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
+ * COPYRIGHT OWNER 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 <android/dlext.h>
+#include <dlfcn.h>
+#include <stdlib.h>
+
+#include <string>
+
+#include "../core_shared_libs.h"
+#include "../dlext_private.h"
+
+extern "C" void global_function();
+extern "C" void internal_function();
+
+int main(int argc, char* argv[]) {
+ if (argc != 2) {
+ fprintf(stderr, "usage: %s NS_PATH\n", argv[0]);
+ fprintf(stderr, "NS_PATH path to the ns_hidden_child_app directory\n");
+ exit(1);
+ }
+
+ // Ensure that -Wl,--needed doesn't break the test by removing DT_NEEDED entries.
+ global_function();
+ internal_function();
+
+ const char* app_lib_dir = argv[1];
+ android_namespace_t* app_ns =
+ android_create_namespace("app", nullptr, app_lib_dir, ANDROID_NAMESPACE_TYPE_ISOLATED,
+ nullptr, nullptr);
+ if (app_ns == nullptr) {
+ fprintf(stderr, "android_create_namespace failed: %s\n", dlerror());
+ exit(1);
+ }
+
+ std::string public_libs = std::string(kCoreSharedLibs) + ":libns_hidden_child_public.so";
+ if (!android_link_namespaces(app_ns, nullptr, public_libs.c_str())) {
+ fprintf(stderr, "android_link_namespaces failed: %s\n", dlerror());
+ exit(1);
+ }
+
+ android_dlextinfo ext = {
+ .flags = ANDROID_DLEXT_USE_NAMESPACE,
+ .library_namespace = app_ns,
+ };
+ void* app_lib = android_dlopen_ext("libns_hidden_child_app.so", RTLD_NOW | RTLD_LOCAL, &ext);
+ if (app_lib == nullptr) {
+ fprintf(stderr, "android_dlopen_ext failed: %s\n", dlerror());
+ exit(1);
+ }
+
+ auto app_function = reinterpret_cast<void(*)()>(dlsym(app_lib, "app_function"));
+ if (app_function == nullptr) {
+ fprintf(stderr, "dlsym failed to find app_function: %s\n", dlerror());
+ exit(1);
+ }
+
+ app_function();
+ return 0;
+}