> What about mapping libc always onto addresses that have a 0xab******
> pattern, and then forbidding character '0xab' in argv[] and envp[] strings
> [done by the kernel].
That's an incredibly bad idea, in part because 0xab is a legitimate
character in many sets, including ISO 8859-1 (in which it's a left
guillemot).
-- Aaron M. Ucko (amu@mit.edu) | For Geek Code, PGP public key, and other info, finger amu@monk.mit.edu. | "Kids! Bringing about Armageddon can be dangerous. Do not attempt it in your home." -- T. Pratchett & N. Gaiman, _Good Omens_