Re: Non-executable stack patch

Aaron M. Ucko (amu@MIT.EDU)
09 Jun 1997 15:12:04 -0400

Ingo Molnar <> writes:

> 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

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