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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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