Consider the issue with Linux. The reason '.' can be used to escape from a chroot() environment is because '.' is not special. '.' is a hard link to current directory. In operating systems that implement chroot() to be 'more secure', '.' must be special cased.
Specifically, '.' and '/..' must be special cased. In the simplest form, this may mean that '/.' and /..' need to be translated in place on reference to appear as if they both referred to '/'.
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Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
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Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
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Want more info? How to link
or How to display code and escape characters
are good places to start.
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