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From: Chris Smith <space DOT dandy AT icloud DOT com>
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Subject: Re: [geda-user] FOSDEM
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Date: Sat, 07 Feb 2015 09:09:50 +0000
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Reply-To: geda-user AT delorie DOT com


> On 6 Feb 2015, at 16:29, Jason White <whitewaterssoftwareinfo AT gmail DOT com> wrote:
> 
> For those who have not seen, I implemented an example program in C
> using Lua to safely read data defined in Lua files. I added to
> protected mode to the interpreter which disables the instructions in
> the Lua virtual machine which are not associated with defining
> (storing) variables. So if you put something other than a variable
> definition in the file, (for instance a loop or a function call) the
> interpreter will just skip over it producing a warning in the console.
> This makes it safe to use as a parser for data files since it disables
> its ability to run it as a program; all it becomes capable of doing is
> pushing strings and numbers to the stack.

Why do you think it necessary to remove all that? All you need do to provide a secure sandbox is remove or sanitise a handful of built in functions and libraries.

Chris