On Tue, Sep 20, 2016 at 2:42 PM, Christian N. <cn00@gmx.at
<mailto:cn00@gmx.at>> wrote:
I thought of setjmp/longjmp too but the setjmp (pcall) and longjmp
(error) both happen in the same Lua DLL.
That does not matter. The problem in question is Lua built for runtime A
but is executed with runtime B. In runtime A, the size of jmp_buf is a;
in runtime B the size is b, and it may be possible that a != b. Then, if
a < b, runtime B's setjmp called by Lua will cause a buffer overrun, or,
if a > b, runtime B's longjmp will not restore some of the state
required by Lua compiled for runtime A.
Secondly, setjmp, being a macro in either A or B or both, may do
something not compatible with the other runtime's longjmp even if a == b.
Cheers,
V.
