On Fri, Jan 23, 2004 at 05:43:02PM -0500, David Dawes wrote:
> So long as ld.so.conf overrides the rpath (does it?) then this won't
> matter. LD_LIBRARY_PATH and LD_PRELOAD won't work for setuid apps.
It doesn't.
Searching for libraries is done in glibc the following order:
DT_RPATH directories (provided DT_RUNPATH dynamic tag doesn't exist)
LD_LIBRARY_PATH env variable dirs
DT_RUNPATH directories
ld.so.cache directories (created by ldconfig which searches directories
mentioned in ld.so.conf and system dirs)
system dirs
Using -rpath on Linux is a bad idea for any directories which can be considered
standard (/lib{,64}, /usr/lib{,64}, /usr/X11R6/lib{,64} certainly should
be considered as standard), as it slows down program startup unnecessarily
(ld.so needs to search for each loaded library all DT_RPATH or DT_RUNPATH
dirs and up to 7 their subdirectories for processor features while without
-rpath it can pick up the right lib from the cache without any filesystem
searching) and (only with -rpath and not -rpath --enable-new-dtags) cannot
be overridden by environment.
Jakub
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