Date: Thu, 28 May 2020 15:20:46 -0400 From: Jeffrey Walton <noloader@...il.com> To: musl@...ts.openwall.com Subject: Re: Shared library loading On Wed, May 27, 2020 at 2:10 PM Dmitry Samersoff <dms@...ersoff.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
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