Fix logic in loading dependencies crossing namespace boundaries
This change addresses multiple problems introduced by
02586a2a34e6acfccf359b94db840f422b6c0231
1. In the case of unsuccessful dlopen the failure guard is triggered
for two namespaces which leads to double unload.
2. In the case where load_tasks includes libraries from 3 and more
namespaces it results in incorrect linking of libraries shared between
second and third/forth and so on namespaces.
The root cause of these problems was recursive call to find_libraries.
It does not do what it is expected to do. It does not form new load_tasks
list and immediately jumps to linking local_group. Not only this skips
reference counting it also will include unlinked but accessible library
from third (and fourth and fifth) namespaces in invalid local group. The
best case scenario here is that for 3 or more namesapces this will
fail to link. The worse case scenario it will link the library
incorrectly with will lead to very hard to catch bugs.
This change removes recursive call and replaces it with explicit list of
local_groups which should be linked. It also revisits the way we do
reference counting - with this change the reference counts are updated after
after libraries are successfully loaded.
Also update soinfo_free to abort in case when linker tries to free same
soinfo for the second time - this makes linker behavior less undefined.
Test: bionic-unit-tests
Bug: http://b/69787209
Change-Id: Iea25ced181a98c6503cce6e2b832c91d697342d5
diff --git a/tests/libs/Android.bp b/tests/libs/Android.bp
index 8d0271a..e45eb6e 100644
--- a/tests/libs/Android.bp
+++ b/tests/libs/Android.bp
@@ -113,6 +113,62 @@
}
// -----------------------------------------------------------------------------
+// Library used by dlext direct unload on the namespace boundary tests
+// -----------------------------------------------------------------------------
+cc_test_library {
+ name: "libtest_missing_symbol",
+ defaults: ["bionic_testlib_defaults"],
+ srcs: ["dlopen_testlib_missing_symbol.cpp"],
+ allow_undefined_symbols: true,
+ relative_install_path: "bionic-loader-test-libs/public_namespace_libs",
+}
+
+
+// -----------------------------------------------------------------------------
+// Library used by dlext indirect unload on the namespace boundary tests
+//
+// These libraries produce following dependency graph:
+// libtest_missing_symbol_root (private ns)
+// +-> libbnstest_public (public ns)
+// +-> libtest_missing_symbol_child_public (public ns)
+// +-> libnstest_public (public ns)
+// +-> libtest_missing_symbol_child_private (private_ns)
+// +-> libnstest_public (public_ns)
+//
+// All libraries except libtest_missing_symbol are located in
+// private_namespace_libs/
+// -----------------------------------------------------------------------------
+cc_test_library {
+ name: "libtest_missing_symbol_child_public",
+ defaults: ["bionic_testlib_defaults"],
+ srcs: ["empty.cpp"],
+ relative_install_path: "bionic-loader-test-libs/public_namespace_libs",
+ shared_libs: ["libnstest_public"],
+}
+
+cc_test_library {
+ name: "libtest_missing_symbol_child_private",
+ defaults: ["bionic_testlib_defaults"],
+ srcs: ["empty.cpp"],
+ relative_install_path: "bionic-loader-test-libs/private_namespace_libs",
+ shared_libs: ["libnstest_public"],
+}
+
+cc_test_library {
+ name: "libtest_missing_symbol_root",
+ defaults: ["bionic_testlib_defaults"],
+ srcs: ["dlopen_testlib_missing_symbol.cpp"],
+ relative_install_path: "bionic-loader-test-libs/private_namespace_libs",
+ allow_undefined_symbols: true,
+ shared_libs: [
+ "libnstest_public",
+ "libtest_missing_symbol_child_public",
+ "libtest_missing_symbol_child_private",
+ ],
+}
+
+// -----------------------------------------------------------------------------
+// -----------------------------------------------------------------------------
// Library used by dlfcn nodelete tests
// -----------------------------------------------------------------------------
cc_test_library {
@@ -142,8 +198,65 @@
// -----------------------------------------------------------------------------
// Build test helper libraries for linker namespaces
+//
+// This set of libraries is used to verify linker namespaces.
+//
+// Test cases
+// 1. Check that private libraries loaded in different namespaces are
+// different. Check that dlsym does not confuse them.
+// 2. Check that public libraries loaded in different namespaces are shared
+// between them.
+// 3. Check that namespace sticks on dlopen
+// 4. Check that having access to shared library (libnstest_public.so)
+// does not expose symbols from dependent library (libnstest_public_internal.so)
+//
+// Dependency tree (visibility)
+// libnstest_root.so (this should be local to the namespace)
+// +-> libnstest_public.so
+// +-> libnstest_public_internal.so
+// +-> libnstest_private.so
+//
+// libnstest_dlopened.so (library in private namespace dlopened from libnstest_root.so)
// -----------------------------------------------------------------------------
-// include $(LOCAL_PATH)/Android.build.linker_namespaces.mk
+cc_test_library {
+ name: "libnstest_root",
+ defaults: ["bionic_testlib_defaults"],
+ srcs: ["namespaces_root.cpp"],
+ relative_install_path: "bionic-loader-test-libs/private_namespace_libs",
+ shared_libs: [
+ "libnstest_public",
+ "libnstest_private",
+ ],
+}
+
+cc_test_library {
+ name: "libnstest_public_internal",
+ defaults: ["bionic_testlib_defaults"],
+ srcs: ["namespaces_public_internal.cpp"],
+ relative_install_path: "bionic-loader-test-libs/public_namespace_libs",
+}
+
+cc_test_library {
+ name: "libnstest_public",
+ defaults: ["bionic_testlib_defaults"],
+ srcs: ["namespaces_public.cpp"],
+ relative_install_path: "bionic-loader-test-libs/public_namespace_libs",
+ shared_libs: ["libnstest_public_internal"],
+}
+
+cc_test_library {
+ name: "libnstest_private",
+ defaults: ["bionic_testlib_defaults"],
+ srcs: ["namespaces_private.cpp"],
+ relative_install_path: "bionic-loader-test-libs/private_namespace_libs",
+}
+
+cc_test_library {
+ name: "libnstest_dlopened",
+ defaults: ["bionic_testlib_defaults"],
+ srcs: ["namespaces_dlopened.cpp"],
+ relative_install_path: "bionic-loader-test-libs/private_namespace_libs",
+}
// -----------------------------------------------------------------------------
// Build DT_RUNPATH test helper libraries