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Message-ID: <20170704160509.GE2032@port70.net>
Date: Tue, 4 Jul 2017 18:05:10 +0200
From: Szabolcs Nagy <nsz@...t70.net>
To: musl@...ts.openwall.com
Subject: Re: Multiple bugs in dlopen & dependency tracking
* Rich Felker <dalias@...c.org> [2017-07-04 10:53:28 -0400]:
> Commit 4ff234f6cba96403b5de6d29d48a59fd73252040 introduced a
> regression whereby dlopen RTLD_GLOBAL of a library that was previously
> loaded RTLD_LOCAL no longer promotes the library to the global
> namespace as intended. This is easy to fix, but there are other
> related bugs I've found in the process, and I want to document them
> here. Some may be trickier to fix. They relate to the ->deps list for
> a dso, which is supposed to contain a dependency-order list of dsos
> that dlsym will search when called on the dso handle. These are also
> connected to the stalled attempt to do dependency-order execution of
> constructors.
maybe adding debugging to the dynamic linker would help
finding these issues earlier (e.g. if LD_DEBUG is set
then print some trace to stderr in whatever format about
what the dynamic linker is doing) since using a debugger
on the dynamic linker is often non-trivial.
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