linker: the global group is added to all built-in namespaces
With ld.config.txt, we now have multiple built-in namespaces other than
the default namespace. Libs (and their dependents) listed in LD_PRELOAD
must be visible to those additional namespaces as well.
This also adds a debugging only feature: path to the linker config file
can be customized via LD_CONFIG_FILE environment variable. This works
only for debuggable builds.
Bug: 38114603
Bug: 62815515
Test: 1. ./external/compiler-rt/lib/asan/scripts/asan_device_setup --lib
prebuilts/clang/host/linux-x86/clang-stable/lib64/clang/5.0/lib/linux
2. enable talkback shortcut
3. in the home screen, hold vol-up/down together
4. device does not reboots and talkback shortcut is toggled
Test: bionic-unit-tests and linker-unit-tests successful
Change-Id: I9a03591053f4a9caea82f0dcb23e7a3d324bb9bd
diff --git a/linker/linker_namespaces.cpp b/linker/linker_namespaces.cpp
index 3c86f99..9fdf0b5 100644
--- a/linker/linker_namespaces.cpp
+++ b/linker/linker_namespaces.cpp
@@ -31,6 +31,8 @@
#include "linker_soinfo.h"
#include "linker_utils.h"
+#include <dlfcn.h>
+
bool android_namespace_t::is_accessible(const std::string& file) {
if (!is_isolated_) {
return true;
@@ -86,3 +88,41 @@
return !is_accessible_ftor(si);
});
}
+
+// TODO: this is slightly unusual way to construct
+// the global group for relocation. Not every RTLD_GLOBAL
+// library is included in this group for backwards-compatibility
+// reasons.
+//
+// This group consists of the main executable, LD_PRELOADs
+// and libraries with the DF_1_GLOBAL flag set.
+soinfo_list_t android_namespace_t::get_global_group() {
+ soinfo_list_t global_group;
+ soinfo_list().for_each([&](soinfo* si) {
+ if ((si->get_dt_flags_1() & DF_1_GLOBAL) != 0) {
+ global_group.push_back(si);
+ }
+ });
+
+ return global_group;
+}
+
+// This function provides a list of libraries to be shared
+// by the namespace. For the default namespace this is the global
+// group (see get_global_group). For all others this is a group
+// of RTLD_GLOBAL libraries (which includes the global group from
+// the default namespace).
+soinfo_list_t android_namespace_t::get_shared_group() {
+ if (this == &g_default_namespace) {
+ return get_global_group();
+ }
+
+ soinfo_list_t shared_group;
+ soinfo_list().for_each([&](soinfo* si) {
+ if ((si->get_rtld_flags() & RTLD_GLOBAL) != 0) {
+ shared_group.push_back(si);
+ }
+ });
+
+ return shared_group;
+}