linker: implement shared namespaces
Shared namespaces clone the list of loaded native
libraries from the caller namespace. This allows
classloaders for bundled apps to share already loaded
libraries with default namespace.
Bug: http://b/22548808
Bug: http://b/26165097
Change-Id: I8949d45937fdb38e1f586ff0679003adac0d9dad
diff --git a/linker/linker.cpp b/linker/linker.cpp
index e38e252..eb938c7 100644
--- a/linker/linker.cpp
+++ b/linker/linker.cpp
@@ -1747,7 +1747,6 @@
});
return true;
-
}
static bool load_library(android_namespace_t* ns,
@@ -2377,8 +2376,12 @@
g_public_namespace_initialized = true;
// create anonymous namespace
+ // When the caller is nullptr - create_namespace will take global group
+ // from the anonymous namespace, which is fine because anonymous namespace
+ // is still pointing to the default one.
android_namespace_t* anon_ns =
- create_namespace("(anonymous)", nullptr, anon_ns_library_path, false, nullptr);
+ create_namespace(nullptr, "(anonymous)", nullptr, anon_ns_library_path,
+ ANDROID_NAMESPACE_TYPE_REGULAR, nullptr);
if (anon_ns == nullptr) {
g_public_namespace_initialized = false;
@@ -2389,16 +2392,23 @@
return true;
}
-android_namespace_t* create_namespace(const char* name,
+android_namespace_t* create_namespace(const void* caller_addr,
+ const char* name,
const char* ld_library_path,
const char* default_library_path,
- bool is_isolated,
+ uint64_t type,
const char* permitted_when_isolated_path) {
if (!g_public_namespace_initialized) {
DL_ERR("cannot create namespace: public namespace is not initialized.");
return nullptr;
}
+ soinfo* caller_soinfo = find_containing_library(caller_addr);
+
+ android_namespace_t* caller_ns = caller_soinfo != nullptr ?
+ caller_soinfo->get_namespace() :
+ g_anonymous_namespace;
+
ProtectedDataGuard guard;
std::vector<std::string> ld_library_paths;
std::vector<std::string> default_library_paths;
@@ -2410,14 +2420,20 @@
android_namespace_t* ns = new (g_namespace_allocator.alloc()) android_namespace_t();
ns->set_name(name);
- ns->set_isolated(is_isolated);
+ ns->set_isolated((type & ANDROID_NAMESPACE_TYPE_ISOLATED) != 0);
ns->set_ld_library_paths(std::move(ld_library_paths));
ns->set_default_library_paths(std::move(default_library_paths));
ns->set_permitted_paths(std::move(permitted_paths));
- // TODO(dimtiry): Should this be global group of caller's namespace?
- auto global_group = make_global_group(&g_default_namespace);
- std::copy(global_group.begin(), global_group.end(), std::back_inserter(ns->soinfo_list()));
+ if ((type & ANDROID_NAMESPACE_TYPE_SHARED) != 0) {
+ // If shared - clone the caller namespace
+ auto& soinfo_list = caller_ns->soinfo_list();
+ std::copy(soinfo_list.begin(), soinfo_list.end(), std::back_inserter(ns->soinfo_list()));
+ } else {
+ // If not shared - copy only the global group
+ auto global_group = make_global_group(caller_ns);
+ std::copy(global_group.begin(), global_group.end(), std::back_inserter(ns->soinfo_list()));
+ }
return ns;
}