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Commit efa7936e authored by Fangrui Song's avatar Fangrui Song
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dlsym: Make RTLD_NEXT prefer default version definition [BZ #14932]

When the first object providing foo defines both foo@v1 and foo@@v2,
dlsym(RTLD_NEXT, "foo") returns foo@v1 while dlsym(RTLD_DEFAULT, "foo")
returns foo@@v2.  The issue is that RTLD_DEFAULT uses the
DL_LOOKUP_RETURN_NEWEST flag while RTLD_NEXT doesn't.  Fix the RTLD_NEXT
branch to use DL_LOOKUP_RETURN_NEWEST.

Note: the new behavior matches FreeBSD rtld.  Future sanitizers will not
need to add versioned interceptors like https://reviews.llvm.org/D96348



Reviewed-by: default avatarAdhemerval Zanella <adhemerval.zanella@linaro.org>
parent f8587a61
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