Messages in this thread | | | Date | Mon, 4 Apr 2022 12:03:37 +0100 (BST) | From | "Maciej W. Rozycki" <> | Subject | Re: [PATCH] x86: Remove a.out support |
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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).
Maciej
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