libfaketime modifies the system time for a single application

List of resources related to LD_PRELOAD, a mechanism for changing application behavior at run-time

Inject a shared library (i.e. arbitrary code) into a live linux process, without ptrace

Turn IP sockets into Unix domain sockets

A simple LD_PRELOAD library to disable SSL certificate verification. Inspired by libeatmydata.

LD_PRELOAD rootkit

Hackbrary to Hook and Augment X11 protocol calls

Make programs think their stdout is a tty / terminal.

My Kobo mods/hacks/tools which aren't patches and aren't in koboutils.

Override time reporting in Linux processes (accelerate/slowdown games, test code involving timers/delays)

Support fonts with double-width icons in xterm/rxvt-unicode/zsh/vim/…

A library for creating mods for Kobo's eReader software, Nickel.

ld_preload userland rootkit

Show stack traces from C++ exceptions at run-time without rebuilding target applications

Proxy protocol v1 and v2 support via an LD_PRELOAD library

Shared library implementations that transform the containing process into a shell when loaded (useful for privilege escalation, argument injection, file overwrites, LD_PRELOAD, etc.).

A simple Linux in-memory .so loader

-x-x-x- DO NOT RUN ON PRODUCTION MACHINE -x-x-x- LD_PRELOAD based user-land rootkit for Linux platform.

LD_PRELOAD for the gopher crowd

redirect file open operations via LD_PRELOAD