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From: "fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug dynamic-link/15271] dlmopen()ed shared library with LM_ID_NEWLM
 crashes if it fails dlsym() twice
Date: Wed, 21 Apr 2021 19:42:26 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D15271

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at sourceware dot org   |fweimer at redhat d=
ot com
         Resolution|---                         |FIXED
   Target Milestone|---                         |2.34
             Status|WAITING                     |RESOLVED

--- Comment #10 from Florian Weimer <fweimer at redhat dot com> ---
Fixed in glibc 2.34 via:

commit b2964eb1d9a6b8ab1250e8a881cf406182da5875
Author: Florian Weimer <fweimer@redhat.com>
Date:   Wed Apr 21 19:49:51 2021 +0200

    dlfcn: Failures after dlmopen should not terminate process [BZ #24772]

    Commit 9e78f6f6e7134a5f299cc8de77370218f8019237 ("Implement
    _dl_catch_error, _dl_signal_error in libc.so [BZ #16628]") has the
    side effect that distinct namespaces, as created by dlmopen, now have
    separate implementations of the rtld exception mechanism.  This means
    that the call to _dl_catch_error from libdl in a secondary namespace
    does not actually install an exception handler because the
    thread-local variable catch_hook in the libc.so copy in the secondary
    namespace is distinct from that of the base namepace.  As a result, a
    dlsym/dlopen/... failure in a secondary namespace terminates the process
    with a dynamic linker error because it looks to the exception handler
    mechanism as if no handler has been installed.

    This commit restores GLRO (dl_catch_error) and uses it to set the
    handler in the base namespace.

    Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

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