Re: lua calling exit()
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- Subject: Re: lua calling exit()
- From: Roberto Ierusalimschy <rieru@...>
- Date: 2001年8月22日 10:12:51 -0500 (CDT)
On 2001年8月22日, Edgar Toernig wrote:
> [...]
> The possibly raised errors in your first example are:
>
> - lua_getglobal may invoke tag methods and by that executes arbitrary
> code and can generate all kind of errors.
>
> - lua_pushstring may get an out of memory error.
>
> - lua_getglobal and lua_pushstring may get a stack overflow.
>
> - If you'd used lua_tostring instead of lua_tonumber you could get
> an out of memory there too.
>
> [...]
> Unfortunately it's pretty difficult to protect against these errors.
The first error can be avoided calling lua_rawget, instead of
lua_getglobal. Stack overflows can be avoided checking stack space before
the call (lua_stackspace). That leave us only with out of memory
errors. Those are really hard to protect in the current implementation.
-- Roberto