Re: OpenSSL 1.1.0
24.11.2016 в 00:37:01 +0100 Kurt Roeckx написал:
> I've always had the impression that there are or used to be
> probems using using dlopen()/dlsym(). Maybe related to some things
> like RTDL_GLOBAL that causes the symbol lookup to go to the wrong
> library. Do you know of any problems related to that?
Some applications (asterisk) use dlsym without dlopen (with
RTLD_NEXT). This definitely asks for trouble if there are more than
one libssl loaded. (All of the functions dlsym'ed by Asterisk were
removed from libssl1.1 though.)
> Note that QT is one of those that uses dlopen()/dlsym() when
> calling openssl functions (for license reasons).
At least RTLD_GLOBAL (ExportExternalSymbolsHint) seems to be in
#ifdef Q_OS_OPENBSD
in qsslsocket_openssl_symbols.cpp.
qsslsocket_openssl_symbols.cpp also tries to load any libssl.* it can
find (in directories gathered from dl_iterate_phdr) when it cannot
find libssl.so.<SHLIB_VERSION_NUMBER>. This asks for trouble when
libssl1.0.2 is not installed and probably needs to be patched out.
(Or openssl-linked should be used. Or Breaks: libssl1.0.0, libssl1.1
looks necessary.)
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