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Continuing the above report, I also found OMAGIC and QMAGIC binaries.
The OMAGIC binaries just segfault at address 0.
The QMAGIC binaries work, when provided with ld.so and the right libraries.
So, CONFIG_HAVE_AOUT=y and CONFIG_BINFMT_AOUT=m are successful,
but only for QMAGIC, the most recent format.

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https://bugs.launchpad.net/bugs/966472

Title:
  missing a.out (ZMAGIC) support

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  In order to run old (1994) commercial binaries, one needs a.out (ZMAGIC) support.
  Executables that used to work (a few years ago) now give "cannot execute binary file".
  strace on the invocation shows "ENOEXEC (Exec format error)".
  Inspection of /boot/config-2.6.32-22-generic shows 
  # CONFIG_HAVE_AOUT is not set
  # CONFIG_IA32_AOUT is not set
  Inspection of /lib/modules/2.6.32-22-generic shows no ia32_aout.ko, where I think there used to be such a module.

  So, perhaps the absence of such a module contributes to the non-running of my old executable.
  Recently, perhaps in 2.6.27-11-generic there still was such a module.
  All this is on x86_64 with Ubuntu 10.04.4 LTS. It looks like Ubuntu 11.10 does not have AOUT support either.

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