Messages in this thread |  | | Date | Sat, 02 Apr 2022 19:24:26 -0700 | From | Kees Cook <> | Subject | Re: [PATCH] x86: Remove a.out support |
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On April 2, 2022 3:14:43 PM PDT, "Maciej W. Rozycki" <macro@orcam.me.uk> wrote: >On Wed, 16 Mar 2022, James Jones wrote: > >> Probably getting a bit off topic, but I did spend a few hours searching >> around for any existing tools to convert a binary from a.out->ELF, and >> trying to come up with something myself by extracting the sections with >> objdump and re-combining them into an ELF using a linker script placing >> the sections at the same locations. I couldn't get it working in an >> evening or two messing with it so I moved on, but I agree something like >> this seems possible in theory. > > 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).
-Kees
-- Kees Cook
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