Explicitly set lib dir permissions during unlink

The default umask changed, so we have to explicitly set the mode of the
lib directory when we create it in unlinklib.

Bug: 6857022
Change-Id: I06fc3f29e99d686bbbb96184d8c314d4cc57e9fe

Author: kruton

cmds/installd/commands.c

@@ -1056,7 +1056,12 @@ int unlinklib(const char* dataDir)
         rc = -errno;
         goto out;
     }
-
+    if (chmod(libdir, 0755) < 0) {
+        ALOGE("cannot chmod dir '%s': %s\n", libdir, strerror(errno));
+        unlink(libdir);
+        rc = -errno;
+        goto out;
+    }
     if (chown(libdir, AID_SYSTEM, AID_SYSTEM) < 0) {
         ALOGE("cannot chown dir '%s': %s\n", libdir, strerror(errno));
         unlink(libdir);