live data

n. 1. Data that is written to be interpreted and takes over program flow
when triggered by some un-obvious operation, such as viewing it. One use of
such hacks is to break security. For example, some smart terminals have
commands that allow one to download strings to program keys; this can be
used to write live data that, when listed to the terminal, infects it with a
security-breaking virus that is triggered the next time a hapless user
strikes that key. For another, there are some well-known bugs in vi that
allow certain texts to send arbitrary commands back to the machine when they
are simply viewed. 2. In C code, data that includes pointers to function
hooks (executable code). 3. An object, such as a trampoline , that is
constructed on the fly by a program and intended to be executed as code.
