[Octave-bug-tracker] [bug #29491] recursive source() causes segfault

[Jaroslav Hajek]

Follow-up Comment #7, bug #29491 (project octave):

I'd like to note that to make things absolutely bulletproof, we'd need to
have an extra total limit on call stack anyway. I can imagine a script
dynamically creating another script using tmpnam, then sourcing it (and
fooling the checks). 

For another (completely braindead) example how to forge an infinite
recursion, consider this stupid example:

function tt()
  fdisp (stderr, length (dbstack));
  system ("touch ./tt.m");
  pause (0.2);
  rehash ();
  tt();
endfunction

I'm not sure whether we should attempt to "fix" this nonsense, maybe we
should just have a limit (say, 100*max_recursion_depth) on the total size of
the call stack for safety.
The original issue would be fixed as a side effect.

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