Emacs runs inside an operating system such as GNU/Linux, and relies on
the operating system to check security constraints such as accesses to
files. The default settings for Emacs are designed for typical use;
they may require some tailoring in environments where security is more
of a concern, or less of a concern, than usual. For example,
file-local variables can be risky, and you can set the variable
enable-local-variables to :safe or (even more
conservatively) to nil; conversely, if your files can all be
trusted and the default checking for these variables is irritating,
you can set enable-local-variables to :all. See Safety of File Variables.
See Security Considerations in The Emacs Lisp Reference Manual, for more information about security considerations when using Emacs as part of a larger application.