I can't seem to find a way to, for example, lock down Lua's file IO functions,

That is easy, compile lua.dll without the file/io extension :)

Or undefine io  io = nil; but you have to disable  require('io'); with  require = nil ...

It doesn't matter much which API you use, you setup your lua sandbox, then call runcode $userinput -- read/combine these :)

• http://lua-users.org/wiki/LuaSecurity
• http://lua-users.org/wiki/SandBoxes
• http://www.corsix.org/lua/bytecode_abuse_0_1.lua
• http://stackoverflow.com/questions/5097993/lua-sandboxing-eliminating-function-creation
• http://stackoverflow.com/questions/1224708/how-can-i-create-a-secure-lua-sandbox
• http://stackoverflow.com/questions/966162/best-way-to-omit-lua-standard-libraries
• http://www.tecgraf.puc-rio.br/~lhf/ftp/lua/#demo
• Re^3: Embedded scripting sandbox? Lua?
• http://luadist.org/

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.