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- Subject: Re: Thoughts on lua_checkstack() implicit usage
- From: Peng Zhicheng <pengzhicheng1986@...>
- Date: Fri, 21 Oct 2011 23:49:59 +0800
于 2011年10月21日 23:29, Rebel Neurofog 写道:
The problem comes with implicit stack usage by calls like luaL_ref() (and others I presume).
As for me, luaL_checkstack () bothers me the most.
This function is supposed to grow extra stack space or throw error if
stack can't grow anymore.
And so it does: it calls luaL_error () which seems to use additional
stack space WITHOUT checking extra space.
Sounds like major security issue.
Do I miss something?
lLua reserved some stack slots for common internal use.
grep `EXTRA_STACK' from the source code, you will find it.