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The glibc dynamic linker currently prevents moving a symbol from one soname to another if the symbol is versioned. This is an artifact of the way symbol-specific versioning is implemented in glibc. There is no fundamental technical reason to disallow this, and glibc 2.30 upstream lifts this restriction.
Upstream commit:
commit f0b2132b35248c1f4a80f62a2c38cddcc802aa8c
Author: Florian Weimer <fweimer>
Date: Fri Jun 28 10:12:50 2019 +0200
ld.so: Support moving versioned symbols between sonames [BZ #24741]
This change should be fully backwards-compatible because the old
code aborted the load if a soname mismatch was encountered
(instead of searching further for a matching symbol). This means
that no different symbols are found.
The soname check was explicitly disabled for the skip_map != NULL
case. However, this only happens with dl(v)sym and RTLD_NEXT,
and those lookups do not come with a verneed entry that could be used
for the check.
The error check was already explicitly disabled for the skip_map !=
NULL case, that is, when dl(v)sym was called with RTLD_NEXT. But
_dl_vsym always sets filename in the struct r_found_version argument
to NULL, so the check was not active anyway. This means that
symbol lookup results for the skip_map != NULL case do not change,
either.
The glibc dynamic linker currently prevents moving a symbol from one soname to another if the symbol is versioned. This is an artifact of the way symbol-specific versioning is implemented in glibc. There is no fundamental technical reason to disallow this, and glibc 2.30 upstream lifts this restriction. Upstream commit: commit f0b2132b35248c1f4a80f62a2c38cddcc802aa8c Author: Florian Weimer <fweimer> Date: Fri Jun 28 10:12:50 2019 +0200 ld.so: Support moving versioned symbols between sonames [BZ #24741] This change should be fully backwards-compatible because the old code aborted the load if a soname mismatch was encountered (instead of searching further for a matching symbol). This means that no different symbols are found. The soname check was explicitly disabled for the skip_map != NULL case. However, this only happens with dl(v)sym and RTLD_NEXT, and those lookups do not come with a verneed entry that could be used for the check. The error check was already explicitly disabled for the skip_map != NULL case, that is, when dl(v)sym was called with RTLD_NEXT. But _dl_vsym always sets filename in the struct r_found_version argument to NULL, so the check was not active anyway. This means that symbol lookup results for the skip_map != NULL case do not change, either.