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From: "fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug dynamic-link/29528] __libc_early_init not called after dlmopen
 that reuses namespace
Date: Fri, 26 Aug 2022 19:45:02 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29528

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |2.37
         Resolution|---                         |FIXED
             Status|ASSIGNED                    |RESOLVED

--- Comment #2 from Florian Weimer <fweimer at redhat dot com> ---
Fixed via:

commit d0e357ff45a75553dee3b17ed7d303bfa544f6fe
Author: Florian Weimer <fweimer@redhat.com>
Date:   Fri Aug 26 21:15:43 2022 +0200

    elf: Call __libc_early_init for reused namespaces (bug 29528)

    libc_map is never reset to NULL, neither during dlclose nor on a
    dlopen call which reuses the namespace structure.  As a result, if a
    namespace is reused, its libc is not initialized properly.  The most
    visible result is a crash in the <ctype.h> functions.

    To prevent similar bugs on namespace reuse from surfacing,
    unconditionally initialize the chosen namespace to zero using memset.

I'm going to backport this all the way to 2.34.

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