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From: Jeffrey Walton <noloader@gmail.com>
To: musl@lists.openwall.com
Subject: Re: [musl] Shared library loading
Date: Thu, 28 May 2020 15:20:46 -0400	[thread overview]
Message-ID: <CAH8yC8n6mUFtFsp3hUbt=xcNd518JPrcuqgEwNp72r_HQwX9oQ@mail.gmail.com> (raw)
In-Reply-To: <a11d2224-cc3f-1731-6a40-c99e07a63239@samersoff.net>

On Wed, May 27, 2020 at 2:10 PM Dmitry Samersoff <dms@samersoff.net> wrote:
>
> > The "b" library loading works on my Ubuntu 19.10 and
> > fails on Alpine 3.11.6 with message: > dlopen failed: Error loading shared library liba.so: No such file or
> > directory (needed by /root/load-lib-sample/bin/b/libb.so)
> > Should it work on Alpine with musl libc as well?
>
> 1. You explicitly load library with a path (.../liba.so)
>
> 2. You are explicitly loading another library (.../libb.so)
>
> 3. Linker find liba.so in the appropriate section of libb.so and
> attempts to load it from syspath (LD_LIBRARY_PATH etc)
>
> 4. Linker doesn't find it. Musl return error on this step but glibc and
> BSD go further.
>
> 5. Linker compares short names of already loaded library and the
> required one
>
> 6. It matches, so Linker decides to resolve
>
> I didn't find any specification that dictates one or other behavior, so
> it could not be considered as a bug.

I believe Drepper's DSO HowTo specifies the behavior for Linux.

Also see https://www.akkadia.org/drepper/dsohowto.pdf.

Jeff

  parent reply	other threads:[~2020-05-28 19:21 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-21 11:27 Alexander Scherbatiy
2020-05-21 15:21 ` Markus Wichmann
2020-05-22 18:07   ` Alexander Scherbatiy
2020-05-22 18:25     ` Rich Felker
2020-05-23 14:12       ` Florian Weimer
2020-05-23 16:05         ` Rich Felker
2020-05-25 17:26       ` Alexander Scherbatiy
2020-05-25 17:46         ` Rich Felker
2020-05-27 18:10           ` Dmitry Samersoff
2020-05-28 18:53             ` Szabolcs Nagy
2020-05-28 19:20             ` Jeffrey Walton [this message]
2020-05-28 19:29               ` Rich Felker
2020-06-04 19:37           ` Alexander Scherbatiy
2020-06-04 19:48             ` Rich Felker

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