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From: "fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug dynamic-link/29522] New: Missing invalidation of the link map
 cache in __cxa_thread_atexit_impl
Date: Thu, 25 Aug 2022 09:11:14 +0000
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X-Bugzilla-Type: new
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X-Bugzilla-Product: glibc
X-Bugzilla-Component: dynamic-link
X-Bugzilla-Version: 2.37
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: fweimer at redhat dot com
X-Bugzilla-Status: NEW
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X-Bugzilla-Priority: P2
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D29522

            Bug ID: 29522
           Summary: Missing invalidation of the link map cache in
                    __cxa_thread_atexit_impl
           Product: glibc
           Version: 2.37
            Status: NEW
          Severity: normal
          Priority: P2
         Component: dynamic-link
          Assignee: unassigned at sourceware dot org
          Reporter: fweimer at redhat dot com
  Target Milestone: ---
             Flags: security-

__cxa_thread_atexit_impl uses the TLS variables dso_symbol_cache and lm_cac=
he,
but the cache is not invalidated in dlclose. This means there is an ABA bug,
and we could use the wrong link map for a stale dso_symbol value.

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