musl - Making a shared library that intercepts call to main work with musl compiled binary

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Message-ID: <CAJhBkVQRq7HSD1o76MgL79R1ce14buFMTp5WDn-Z+E4b-1qjDw@mail.gmail.com>
Date: Mon, 6 Jul 2015 13:00:52 -0400
From: Riyad Parvez <riyad.parvez@...terloo.ca>
To: musl@...ts.openwall.com
Subject: Making a shared library that intercepts call to main work with musl
 compiled binary

Hi All,

I've shared library [1] which intercepts loading of a binary and does some
pre-processing with the command-line arguments via "LD_PRELOAD" technique.
The shared library works fine with glibc compiled binary i.e., it can
intercept the call to main and does some preprocessing. But it can't
intercept call to "main" in musl-compiled binary. I've compiled my binary
in static mode with musl "CC=/musl-gcc -static". How can I make the shared
library work with musl-compiled binary?

Thanks
Riyad

[1]: https://github.com/dslab-epfl/s2e/blob/master/guest/init_env/init_env.c

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