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

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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>
This commit is contained in:
Florian Weimer
2020-12-04 09:13:43 +01:00
parent b44ac4f4c7
commit 600d9e0c87
10 changed files with 508 additions and 3 deletions
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6
elf/tst-glibc-hwcaps-cache.script Normal file
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# test-container does not support scripts in sysdeps directories, so
# collect everything in one file.
cp $B/elf/libmarkermod2-1.so $L/libmarkermod2.so
cp $B/elf/libmarkermod3-1.so $L/libmarkermod3.so
cp $B/elf/libmarkermod4-1.so $L/libmarkermod4.so