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2.6 KiB
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15 lines
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<?xml version="1.0" encoding="ISO-8859-1" standalone="no"?>
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<html xmlns="http://www.w3.org/1999/xhtml"><head><title>live data</title><link rel="stylesheet" href="../../jargon.css" type="text/css"/><meta name="generator" content="DocBook XSL Stylesheets V1.61.0"/><link rel="home" href="../index.html" title="The Jargon File"/><link rel="up" href="../L.html" title="L"/><link rel="previous" href="live.html" title="live"/><link rel="next" href="Live-Free-Or-Die-.html" title="Live Free Or Die!"/></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">live data</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="live.html">Prev</a><EFBFBD></td><th width="60%" align="center">L</th><td width="20%" align="right"><EFBFBD><a accesskey="n" href="Live-Free-Or-Die-.html">Next</a></td></tr></table><hr/></div><dt><a id="live-data"/><dt xmlns="" id="live-data"><b>live data</b>: <span xmlns="http://www.w3.org/1999/xhtml" class="grammar">n.</span></dt></dt><dd><p> 1. Data that is written to be interpreted and takes over program
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flow when triggered by some un-obvious operation, such as viewing it. One
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use of such hacks is to break security. For example, some smart terminals
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have commands that allow one to download strings to program keys; this can
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be used to write live data that, when listed to the terminal, infects it
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with a security-breaking <a href="../V/virus.html"><i class="glossterm">virus</i></a> that is triggered the
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next time a hapless user strikes that key. For another, there are some
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well-known bugs in <a href="../V/vi.html"><i class="glossterm">vi</i></a> that allow certain texts to
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send arbitrary commands back to the machine when they are simply
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viewed.</p></dd><dd><p> 2. In C code, data that includes pointers to function
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<a href="../H/hook.html"><i class="glossterm">hook</i></a>s (executable code). </p></dd><dd><p> 3. An object, such as a <a href="../T/trampoline.html"><i class="glossterm">trampoline</i></a>, that is
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constructed on the fly by a program and intended to be executed as
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code.</p></dd><div class="navfooter"><hr/><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="live.html">Prev</a><EFBFBD></td><td width="20%" align="center"><a accesskey="u" href="../L.html">Up</a></td><td width="40%" align="right"><EFBFBD><a accesskey="n" href="Live-Free-Or-Die-.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">live<EFBFBD></td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"><EFBFBD>Live Free Or Die!</td></tr></table></div></body></html>
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