Re: Non-Exec stack patches

[David Mosberger]

>>>>> On Wed, 24 Mar 2004 01:21:49 +0100, Kurt Garloff <garloff@xxxxxxx> said:

  >> Which architectures are currently making their pre-page execute
  >> permissions depend upon VM_EXEC?  Would additional arch patches
  >> be needed for this?

  Kurt> It works on AMD64 (not ia32e), both for 64bit and 32bit
  Kurt> binaries.  I have not yet tested other archs.

IA64 Linux had non-executable stack/data before PT_GNU_STACK was invented.
It's keyed off a ELF header flags bit:

/* Least-significant four bits of ELF header's e_flags are
   OS-specific.  The bits are interpreted as follows by Linux: */
#define EF_IA_64_LINUX_EXECUTABLE_STACK 0x1

I guess I never quiet understood why an entire program header is
needed for this, but that's just me.

	--david
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