Don't reference global variable modpath in insert_module and its helpers.

This allows insert_module to to be used for loading the signed uprobes.ko
module.

Allow the use of $$parms and $$return in uprobes based probes for
unprivileged users.

Re-add management of module signatures in the cache. Don't know why
it was removed.

1 files changed, 7 insertions, 0 deletions

diff --git a/cache.cxx b/cache.cxx
index 8a6553ff..29c20d0d 100644
--- a/cache.cxx
+++ b/cache.cxx
@@ -68,6 +68,9 @@ add_to_cache(systemtap_session& s)
       s.use_cache = false;
       return;
     }
+  // Copy the signature file, if any. It is not an error if this fails.
+  if (file_exists (module_src_path + ".sgn"))
+    copy_file(module_src_path + ".sgn", s.hash_path + ".sgn", verbose);
 
   string c_dest_path = s.hash_path;
   if (c_dest_path.rfind(".ko") == (c_dest_path.size() - 3))
@@ -155,6 +158,10 @@ get_from_cache(systemtap_session& s)
 	  close(fd_c);
 	  return false;
 	}
+      // Copy the module signature file, if any.
+      // It is not an error if this fails.
+      if (file_exists (s.hash_path + ".sgn"))
+	copy_file(s.hash_path + ".sgn", module_dest_path + ".sgn");
     }
 
   // We're done with these file handles.