[673b0d8] | 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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[1770019] | 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN" "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
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[673b0d8] | 3 | <!ENTITY % general-entities SYSTEM "../general.ent">
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| 4 | %general-entities;
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| 5 | ]>
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[81fd230] | 6 | <sect1 id="ch-system-zlib" role="wrap">
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[673b0d8] | 7 | <title>Zlib-&zlib-version;</title>
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| 8 | <?dbhtml filename="zlib.html"?>
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[24380c7] | 9 |
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[673b0d8] | 10 | <indexterm zone="ch-system-zlib"><primary sortas="a-Zlib">Zlib</primary></indexterm>
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| 11 |
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[a001133] | 12 | <sect2 role="package"><title/>
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[90b56f5] | 13 | <para>The Zlib package contains compression and decompression routines used by
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[81fd230] | 14 | some programs.</para>
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[5888299] | 15 |
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[a001133] | 16 | <segmentedlist>
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| 17 | <segtitle>&buildtime;</segtitle>
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| 18 | <segtitle>&diskspace;</segtitle>
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[fc1024a] | 19 | <seglistitem><seg>0.1 SBU</seg><seg>2.7 MB</seg></seglistitem>
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[a001133] | 20 | </segmentedlist>
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[673b0d8] | 21 |
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[81fd230] | 22 | <segmentedlist>
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[45992ae] | 23 | <segtitle>&dependencies;</segtitle>
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[81fd230] | 24 | <seglistitem><seg>Binutils, Coreutils, GCC, Glibc, Make, and Sed</seg></seglistitem>
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| 25 | </segmentedlist>
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[a001133] | 26 | </sect2>
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[24380c7] | 27 |
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[a001133] | 28 | <sect2 role="installation">
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[73aedd1d] | 29 | <title>Installation of Zlib</title>
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| 30 |
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[624e062] | 31 | <para>Zlib has a buffer overflow vulnerability that can lead to a Denial of
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| 32 | Service attack. The following patch fixes the problem:</para>
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| 33 |
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| 34 | <screen><userinput>patch -Np1 -i ../zlib-&zlib-version;-security_fix-1.patch</userinput></screen>
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| 35 |
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[81fd230] | 36 | <note><para>Zlib is known to build its shared library incorrectly if
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| 37 | <envar>CFLAGS</envar> is specified in the environment. If using a
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| 38 | specified <envar>CFLAGS</envar>
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| 39 | variable, be sure to add the <parameter>-fPIC</parameter> directive to
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| 40 | the <envar>CFLAGS</envar> variable for the duration of the
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| 41 | configure command below, then remove it afterwards.</para></note>
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| 42 |
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[4248b0e] | 43 | <para>Prepare Zlib for compilation:</para>
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| 44 |
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[5091251] | 45 | <screen><userinput>./configure --prefix=/usr --shared --libdir=/lib</userinput></screen>
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[4248b0e] | 46 |
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[73aedd1d] | 47 | <para>Compile the package:</para>
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| 48 |
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| 49 | <screen><userinput>make</userinput></screen>
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| 50 |
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[673b0d8] | 51 | <para>To test the results, issue:
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[8a5f906] | 52 | <userinput>make check</userinput>.</para>
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[dfddb12] | 53 |
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| 54 | <para>Install the shared library:</para>
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[73aedd1d] | 55 |
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| 56 | <screen><userinput>make install</userinput></screen>
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| 57 |
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[373a708] | 58 | <para>The previous command installed a <filename
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| 59 | class="extension">.so</filename> file in <filename
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| 60 | class="directory">/lib</filename>. We will remove it and relink it into
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| 61 | <filename class="directory">/usr/lib</filename>:</para>
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[7111666] | 62 |
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| 63 | <screen><userinput>rm /lib/libz.so
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| 64 | ln -sf ../../lib/libz.so.&zlib-version; /usr/lib/libz.so</userinput></screen>
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| 65 |
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[81fd230] | 66 | <para>Build the static library:</para>
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[8ad7980] | 67 |
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[73aedd1d] | 68 | <screen><userinput>make clean
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| 69 | ./configure --prefix=/usr
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| 70 | make</userinput></screen>
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| 71 |
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[81fd230] | 72 | <para>To test the results again, issue:
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[8a5f906] | 73 | <userinput>make check</userinput>.</para>
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[73aedd1d] | 74 |
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[84e4cae] | 75 | <para>Install the static library:</para>
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[73aedd1d] | 76 |
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| 77 | <screen><userinput>make install</userinput></screen>
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| 78 |
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[81fd230] | 79 | <para>Fix the permissions on the static library:</para>
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[84e4cae] | 80 |
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| 81 | <screen><userinput>chmod 644 /usr/lib/libz.a</userinput></screen>
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| 82 |
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[73aedd1d] | 83 | </sect2>
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[24380c7] | 84 |
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[5888299] | 85 |
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[c6cb3aa] | 86 | <sect2 id="contents-zlib" role="content"><title>Contents of Zlib</title>
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[673b0d8] | 87 |
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[81fd230] | 88 | <segmentedlist>
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| 89 | <segtitle>Installed libraries</segtitle>
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[373a708] | 90 | <seglistitem><seg>libz.[a,so]</seg></seglistitem>
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[81fd230] | 91 | </segmentedlist>
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| 92 |
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| 93 | <variablelist><bridgehead renderas="sect3">Short Descriptions</bridgehead>
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| 94 | <?dbfo list-presentation="list"?>
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[8f97096] | 95 | <?dbhtml list-presentation="table"?>
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[81fd230] | 96 |
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| 97 | <varlistentry id="libz">
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| 98 | <term><filename class="libraryfile">libz</filename></term>
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| 99 | <listitem>
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| 100 | <para>Contains compression and un-compression
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| 101 | functions used by some programs</para>
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| 102 | <indexterm zone="ch-system-zlib libz"><primary sortas="c-libz">libz</primary></indexterm>
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| 103 | </listitem>
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| 104 | </varlistentry>
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| 105 | </variablelist>
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[673b0d8] | 106 |
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| 107 | </sect2>
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| 108 |
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| 109 | </sect1>
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[81fd230] | 110 |
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