How can I sandbox things in roblox?

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#1

How can I sandbox builtin functions roblox has like loadstring or rawget? I’m not trying to create a script builder but I believe it’s fun and good knowledge to have. I apologize, I don’t have any code to show because I don’t know where to start. I’m not asking for a handout but an article our guidance would help a lot.

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#2

I don’t recommend this, since it can disable some of Luau’s optimizations, but you can use setfenv on a function to set its environment.

local env = { }

local function f()
    print(1)
end

setfenv(f, env)
f() -- attempt to call a nil value

Also, rawget isn’t inherently dangerous, not sure why you want to sandbox it

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#3

Thank you a lot, I’ll keep what you said in mind. I used rawget as an example, as I said I’m not trying to prevent anything necessarily dangerous, I just want knowledge over how to do it.

#4

I apologize for being annoying but how would I sandbox things like loadstring with this?

#5

loadstring returns a function, so you would pass that on.

local f = loadstring("print(1)")
setfenv(f, { })
f() -- attempt to call a nil value
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