LD_LRELOAD Trivia

There are many useful things that can be done using this hack. For example, the runsocks library will turn socket interface using programs into SOCK5 compliant programs on the fly.
Things are not always that simple: for example, if you'd like to hijack the open() symbol of the GNU C library you will find that certain internal functions calls the _open() symbol instead, and it is not exported by default...
It can also be a big security risk ;-)

There are many useful things that can be done using this hack. For example, the runsocks library will turn socket interface using programs into SOCK5 compliant programs on the fly.