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From: Farid Zakaria <fmzakari@ucsc.edu>
To: libc-help@sourceware.org
Subject: How can I wrap ld-linux or execve into it?
Date: Mon, 31 Jan 2022 12:10:10 -0800	[thread overview]
Message-ID: <CAH4OOv4bJA8xpPfEyBs3bOG4ijzz=fh4pwRgVTtHk3bcvroNpA@mail.gmail.com> (raw)

Hi,

I am looking to perform some functionality before the dynamic linker
(linux-ld/ld.so) is invoked.

My naive assessment was that I would be able to set in the PT_INTERP
section of a binary, my *static binary*, which will then execve into
the dynamic linker after doing some precanned actions.

Unfortunately, trying this has resulted in some SIGSEGV...

I came across https://github.com/Mic92/nix-ld which seems to do
something similar, but I was curious why it has to do a lot more to
achieve the same effect with a jump.

I have also been pointed to LD_AUDIT however I am also interested in
having it agnostic to libc (glibc vs. musl)

Thank you for any tips, guidance or links you can provide.
FZ

             reply	other threads:[~2022-01-31 20:10 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-01-31 20:10 Farid Zakaria [this message]
2022-01-31 20:29 ` Farid Zakaria
2022-02-01 12:43 ` Adhemerval Zanella
2022-02-01 17:14   ` Farid Zakaria
2022-02-01 17:49     ` Adhemerval Zanella

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