linker: only re-open std* for setuid programs.

get_AT_SECURE() was getting called before linker_env_init() had
been called, and returning the default value ("true"). This was
causing us to reopen closed stdin, stdout, and stderr for ALL
processes, not just privileged (setuid) processes.

Calling path:
  - __linker_init
    - soinfo_link_image
      - get_AT_SECURE
    - __linker_init_post_relocation
      - linker_env_init

This change restores the intended behavior of only re-opening
stdin, stdout, and stderr for privileged processes.

Change-Id: I8b085ea6597710ac4c1a3c93f1bf8b81eecb08c0
1 file changed