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- Subject: Re: future of bytecode verifier
- From: Alexander Gladysh <agladysh@...>
- Date: Wed, 4 Mar 2009 23:36:29 +0300
On Wed, Mar 4, 2009 at 9:58 PM, Luiz Henrique de Figueiredo
> Following several bytecode exploits found by the relentless Peter Cawley
> and others, we are considering dropping the bytecode verifier completely in
> Lua 5.2. It seems useless to make a promise that we can't seem to deliver
> without a much more complicated verifier than the current one, and possibly
> with the need for costly runtime checks as well.
> Our impression is that applications that are open to running arbitrary Lua
> code provided by the user should avoid accepting precompiled scripts. So we
> think that adding a flag to load (the Lua function from the base library)
> to check for and reject precompiled scripts is enough for Lua-based apps
> to be able to reject precompiled scripts if they want to. We don't think
> anything else is needed in the C side, since you can always write you own
> lua_Reader function to reject precompiled scripts.
Perhaps a luaL_* convenience function?