13 lines
2.3 KiB
HTML
13 lines
2.3 KiB
HTML
<?xml version="1.0" encoding="ISO-8859-1" standalone="no"?>
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<html xmlns="http://www.w3.org/1999/xhtml"><head><title>screaming tty</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="../S.html" title="S"/><link rel="previous" href="scream-and-die.html" title="scream and die"/><link rel="next" href="screen.html" title="screen"/></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">screaming tty</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="scream-and-die.html">Prev</a> </td><th width="60%" align="center">S</th><td width="20%" align="right"> <a accesskey="n" href="screen.html">Next</a></td></tr></table><hr/></div><dt><a id="screaming-tty"/><dt xmlns="" id="screaming-tty"><b>screaming tty</b>: <span xmlns="http://www.w3.org/1999/xhtml" class="grammar">n.</span></dt></dt><dd><p> [Unix] A terminal line which spews an infinite number of random
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characters at the operating system. This can happen if the terminal is
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either disconnected or connected to a powered-off terminal but still
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enabled for login; misconfiguration, misimplementation, or simple bad luck
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can start such a terminal screaming. A screaming tty or two can seriously
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degrade the performance of a vanilla Unix system; the arriving
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“<span class="quote">characters</span>” are treated as userid/password pairs and tested
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as such. The Unix password encryption algorithm is designed to be
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computationally intensive in order to foil brute-force crack attacks, so
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although none of the logins succeeds; the overhead of rejecting them all
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can be substantial.</p></dd><div class="navfooter"><hr/><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="scream-and-die.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="../S.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="screen.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">scream and die </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> screen</td></tr></table></div></body></html>
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