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From: "fweimer at redhat dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug dynamic-link/25938] ld.so.cache should store meaning of hwcap
 mask bits
Date: Fri, 04 Dec 2020 08:52:39 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D25938

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |2.33
                 CC|                            |fweimer at redhat dot com
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED
           Assignee|unassigned at sourceware dot org   |fweimer at redhat d=
ot com

--- Comment #1 from Florian Weimer <fweimer at redhat dot com> ---
More or less fixed in glibc 2.33 by a new mechanism:

commit b44ac4f4c7a8bbe5eaa2701aa9452eaf2c96e1dd
Author: Florian Weimer <fweimer@redhat.com>
Date:   Fri Dec 4 09:13:43 2020 +0100

    elf: Process glibc-hwcaps subdirectories in ldconfig

    Libraries from these subdirectories are added to the cache
    with a special hwcap bit DL_CACHE_HWCAP_EXTENSION, so that
    they are ignored by older dynamic loaders.

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

commit 600d9e0c87940da9b0fdeff492bf888df852d40c
Author: Florian Weimer <fweimer@redhat.com>
Date:   Fri Dec 4 09:13:43 2020 +0100

    elf: Add glibc-hwcaps subdirectory support to ld.so cache processing

    This recognizes the DL_CACHE_HWCAP_EXTENSION flag in cache entries,
    and picks the supported cache entry with the highest priority.

    The elf/tst-glibc-hwcaps-prepend-cache test documents a non-desired
    aspect of the current cache implementation: If the cache selects a DSO
    that does not exist on disk, _dl_map_object falls back to open_path,
    which may or may not find an alternative implementation.  This is an
    existing limitation that also applies to the legacy hwcaps processing
    for ld.so.cache.

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

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