Re: Q: path for dynamic libs hardwired ?

>From: Christoph Liebig <chris@dvs1.informatik.th-darmstadt.de> >Date: Tue, 10 Jun 1997 18:47:01 +0200 >X-Informix-List-Id: <news.38996> > >I am wondering if the search path for dynamic link libs (Solaris >platform) for informix tools, e.g. dbaccess & co are hardwired >into the binaries or set at installation time. It depends on which version you are using... If you're using a 7.1x version, the answer may well be 'Yes'. For some tools, notably the ones which run SUID root, it is absolutely necessary that the shared libraries are in /usr/lib because the basic Solaris (SVR4) security mechanisms do not allow the user to specify where the shared libraries come from -- because there'd be nothing to stop an unscrupulous user from writing their own version of the library and putting it in a directory on LD_LIBRARY_PATH before the official library, thereby getting root priveleges to do what they will with the system. For DB-Access in the 7.2x versions, the executables do not use any Informix shared libraries (they are statically linked): $ . 722UC2.OnLine $ ldd `whence dbaccess` libnsl.so.1 => /usr/lib/libnsl.so.1 libsocket.so.1 => /usr/lib/libsocket.so.1 libaio.so.1 => /usr/lib/libaio.so.1 libm.so.1 => /usr/lib/libm.so.1 libc.so.1 => /usr/lib/libc.so.1 libdl.so.1 => /usr/lib/libdl.so.1 libintl.so.1 => /usr/lib/libintl.so.1 libmp.so.1 => /usr/lib/libmp.so.1 libw.so.1 => /usr/lib/libw.so.1 $ >Currently we need to have some links in /usr/lib to the libs >in the INFORMIXDIR/lib directory. >I would rather like to extend LD_LIBRARY_PATH and drop the links >in /usr/lib. > >(How) Is this possible ? Well, there's the obvious suggestion -- try it. You can only do that if the programs will never be used by root, and only if the programs were linked in such a way that the pathname for the libraries was not specified explicitly in the link line. And beware of the OnLine utilities... Yours, Jonathan Leffler (johnl@informix.com) #include <disclaimer.h>