Load libraries in breadth-first order
This patch fixes the problem with symbol search order
for dlsym(RTLD_DEFAULT/RTLD_NEXT, .) by loading libraries
and ld_preloads in correct order.
Bug: https://code.google.com/p/android/issues/detail?id=74255
Change-Id: I4cf84c70dbaabe99310230dfda12385ae5401859
diff --git a/tests/dlfcn_test.cpp b/tests/dlfcn_test.cpp
index 6de38c8..b8c33dd 100644
--- a/tests/dlfcn_test.cpp
+++ b/tests/dlfcn_test.cpp
@@ -130,6 +130,55 @@
}
#endif
+TEST(dlfcn, dlopen_check_order) {
+ // Here is how the test library and its dt_needed
+ // libraries are arranged
+ //
+ // libtest_check_order.so
+ // |
+ // +-> libtest_check_order_1_left.so
+ // | |
+ // | +-> libtest_check_order_a.so
+ // | |
+ // | +-> libtest_check_order_b.so
+ // |
+ // +-> libtest_check_order_2_right.so
+ // | |
+ // | +-> libtest_check_order_d.so
+ // | |
+ // | +-> libtest_check_order_b.so
+ // |
+ // +-> libtest_check_order_3_c.so
+ //
+ // load order should be (1, 2, 3, a, b, d)
+ //
+ // get_answer() is defined in (2, 3, a, b, c)
+ // get_answer2() is defined in (b, d)
+ void* sym = dlsym(RTLD_DEFAULT, "dlopen_test_get_answer");
+ ASSERT_TRUE(sym == nullptr);
+ void* handle = dlopen("libtest_check_order.so", RTLD_NOW);
+ ASSERT_TRUE(handle != nullptr);
+ typedef int (*fn_t) (void);
+ fn_t fn, fn2;
+ fn = reinterpret_cast<fn_t>(dlsym(RTLD_DEFAULT, "dlopen_test_get_answer"));
+ ASSERT_TRUE(fn != NULL);
+ fn2 = reinterpret_cast<fn_t>(dlsym(RTLD_DEFAULT, "dlopen_test_get_answer2"));
+ ASSERT_TRUE(fn2 != NULL);
+
+ ASSERT_EQ(42, fn());
+ ASSERT_EQ(43, fn2());
+ dlclose(handle);
+}
+
+// libtest_with_dependency_loop.so -> libtest_with_dependency_loop_a.so ->
+// libtest_with_dependency_loop_b.so -> libtest_with_dependency_loop_c.so ->
+// libtest_with_dependency_loop_a.so
+TEST(dlfcn, dlopen_check_loop) {
+ void* handle = dlopen("libtest_with_dependency_loop.so", RTLD_NOW);
+ ASSERT_TRUE(handle == NULL);
+ ASSERT_STREQ("dlopen failed: recursive link to \"libtest_with_dependency_loop_a.so\"", dlerror());
+}
+
TEST(dlfcn, dlopen_failure) {
void* self = dlopen("/does/not/exist", RTLD_NOW);
ASSERT_TRUE(self == NULL);