Allow traversal into /storage paths.

Apps are no longer required to have sdcard_r or sdcard_rw to access
some parts of external storage.  Relax the mount parameters to allow
everyone to traverse.

Bug: 10577808
Change-Id: Ife3c6fb18028f7093ff853459c1ca1e0ec7a6d01
diff --git a/runtime/runtime.cc b/runtime/runtime.cc
index 09cbd0b..c87ce6c 100644
--- a/runtime/runtime.cc
+++ b/runtime/runtime.cc
@@ -773,7 +773,7 @@
   const char* target_base = getenv("EMULATED_STORAGE_TARGET");
   if (target_base != NULL) {
     if (mount("tmpfs", target_base, "tmpfs", MS_NOSUID | MS_NODEV,
-              "uid=0,gid=1028,mode=0050") == -1) {
+              "uid=0,gid=1028,mode=0751") == -1) {
       LOG(WARNING) << "Failed to mount tmpfs to " << target_base;
       return false;
     }