injectso

http://www.securereality.com.au/

"injectso is a tool to inject shared libraries into running processes
under Linux (IA32 and Sparc) and Solaris (Sparc). It also provides a
set of routines that injected libraries can use to easily modify the
behaviour of the host process by intercepting library function calls."
See the README.html in the tarball for more information. Applications
include patching security holes (or other bugs) on the fly and,
conversely, adding stealthy backdoors to servers on compromised systems.
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