Fix for default library path "/vendor/lib"

Android N restrict which libraries C/C++ code
can link against at runtime.

If device has a vendor partition
then /system/vendor symlink to /vendor.
Otherwise /vendor symlink to /system/vendor.

But is_system_library() is only checking /vendor/lib.
It will return false for /system/vendor/lib path.
It is need to add a real path to default library path.

Similarily, default ld library path is already checking.
parse_LD_LIBRARY_PATH()->parse_path()->resolve_paths()

Test: build bionic and run bionic-unit-tests
Bug: http://b/31919547
Change-Id: Ie6777e2b02729948ce77a94de32343d40358bf2c
Signed-off-by: Hyangseok Chae <neo.chae@lge.com>
(cherry picked from commit 2589f9de6473a2030594e2c5e95541f00eb2dc7a)

1 files changed, 6 insertions, 1 deletions

diff --git a/linker/linker.cpp b/linker/linker.cpp
index 8b28d7537..9dc928eb4 100644
--- a/linker/linker.cpp
+++ b/linker/linker.cpp
@@ -4153,9 +4153,14 @@ static void init_default_namespace() {
     g_default_ld_paths = kDefaultLdPaths;
   }
 
+  char real_path[PATH_MAX];
   std::vector<std::string> ld_default_paths;
   for (size_t i = 0; g_default_ld_paths[i] != nullptr; ++i) {
-    ld_default_paths.push_back(g_default_ld_paths[i]);
+    if (realpath(g_default_ld_paths[i], real_path) != nullptr) {
+      ld_default_paths.push_back(real_path);
+    } else {
+      ld_default_paths.push_back(g_default_ld_paths[i]);
+    }
   }
 
   g_default_namespace.set_default_library_paths(std::move(ld_default_paths));