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.
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