Messages in this thread | | | From | David Laight <> | Subject | RE: [PATCH] x86: Remove a.out support | Date | Mon, 4 Apr 2022 17:07:11 +0000 |
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From: Maciej W. Rozycki > Sent: 04 April 2022 12:04 > > On Sat, 2 Apr 2022, Kees Cook wrote: > > > > Chiming in late as I'm scanning outstanding mailing list traffic: if this > > >is as you say all statically linked stuff, then converting from a.out to > > >ELF might be as easy as: > > > > > >$ objcopy -I a.out-i386-linux -O elf32-i386 a.out-binary elf-binary > > > > Based on my research (and the wrapper I ended up writing), I don't think > > this is sufficient because entry point handling is different between ELF > > and a.out (specifically the stack layout and initial sp register value). > > Fair enough. I guess the exact value of %esp doesn't matter that much > (why would it?), but the arguments and environment may well be structured > differently (and indeed based on a glance over binfmt_aout.c there's extra > indirection involved compared to the ELF i386 psABI).
You could write a custom 'elf interpreter'. Hacking at those isn't for the faint-hearted :-)
David
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