[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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[3e36a78] | 4 | <!ENTITY % patches-entities SYSTEM "../patches.ent">
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[673b0d8] | 5 | %general-entities;
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[3e36a78] | 6 | %patches-entities;
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[673b0d8] | 7 | ]>
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[81fd230] | 8 | <sect1 id="ch-system-zlib" role="wrap">
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[673b0d8] | 9 | <title>Zlib-&zlib-version;</title>
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| 10 | <?dbhtml filename="zlib.html"?>
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[24380c7] | 11 |
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[673b0d8] | 12 | <indexterm zone="ch-system-zlib"><primary sortas="a-Zlib">Zlib</primary></indexterm>
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| 13 |
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[a001133] | 14 | <sect2 role="package"><title/>
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[e5846ef] | 15 | <para>The Zlib package contains compression and decompression routines used by
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[81fd230] | 16 | some programs.</para>
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[5888299] | 17 |
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[a001133] | 18 | <segmentedlist>
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| 19 | <segtitle>&buildtime;</segtitle>
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| 20 | <segtitle>&diskspace;</segtitle>
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[eb6d9eb] | 21 | <seglistitem><seg>0.1 SBU</seg><seg>2.7 MB</seg></seglistitem>
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[a001133] | 22 | </segmentedlist>
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[673b0d8] | 23 |
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[81fd230] | 24 | <segmentedlist>
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[45992ae] | 25 | <segtitle>&dependencies;</segtitle>
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[81fd230] | 26 | <seglistitem><seg>Binutils, Coreutils, GCC, Glibc, Make, and Sed</seg></seglistitem>
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| 27 | </segmentedlist>
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[a001133] | 28 | </sect2>
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[24380c7] | 29 |
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[a001133] | 30 | <sect2 role="installation">
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[73aedd1d] | 31 | <title>Installation of Zlib</title>
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| 32 |
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[fb39896] | 33 | <para>Zlib has a buffer overflow vulnerability that can lead to a Denial of
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| 34 | Service attack. The following patch fixes the problem:</para>
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[cf62a33e] | 35 |
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| 36 | <screen><userinput>patch -Np1 -i ../&zlib-security_fix-patch;</userinput></screen>
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| 37 |
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[81fd230] | 38 | <note><para>Zlib is known to build its shared library incorrectly if
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| 39 | <envar>CFLAGS</envar> is specified in the environment. If using a
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| 40 | specified <envar>CFLAGS</envar>
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| 41 | variable, be sure to add the <parameter>-fPIC</parameter> directive to
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| 42 | the <envar>CFLAGS</envar> variable for the duration of the
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| 43 | configure command below, then remove it afterwards.</para></note>
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| 44 |
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[4248b0e] | 45 | <para>Prepare Zlib for compilation:</para>
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| 46 |
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[5091251] | 47 | <screen><userinput>./configure --prefix=/usr --shared --libdir=/lib</userinput></screen>
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[4248b0e] | 48 |
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[73aedd1d] | 49 | <para>Compile the package:</para>
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| 50 |
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| 51 | <screen><userinput>make</userinput></screen>
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| 52 |
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[673b0d8] | 53 | <para>To test the results, issue:
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[8a5f906] | 54 | <userinput>make check</userinput>.</para>
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[dfddb12] | 55 |
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| 56 | <para>Install the shared library:</para>
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[73aedd1d] | 57 |
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| 58 | <screen><userinput>make install</userinput></screen>
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| 59 |
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[bc2136e] | 60 | <para>The previous command installed a <filename
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| 61 | class="extension">.so</filename> file in <filename
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| 62 | class="directory">/lib</filename>. We will remove it and relink it into
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| 63 | <filename class="directory">/usr/lib</filename>:</para>
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[7111666] | 64 |
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| 65 | <screen><userinput>rm /lib/libz.so
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| 66 | ln -sf ../../lib/libz.so.&zlib-version; /usr/lib/libz.so</userinput></screen>
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| 67 |
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[81fd230] | 68 | <para>Build the static library:</para>
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[8ad7980] | 69 |
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[73aedd1d] | 70 | <screen><userinput>make clean
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| 71 | ./configure --prefix=/usr
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| 72 | make</userinput></screen>
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| 73 |
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[81fd230] | 74 | <para>To test the results again, issue:
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[8a5f906] | 75 | <userinput>make check</userinput>.</para>
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[73aedd1d] | 76 |
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[84e4cae] | 77 | <para>Install the static library:</para>
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[73aedd1d] | 78 |
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| 79 | <screen><userinput>make install</userinput></screen>
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| 80 |
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[81fd230] | 81 | <para>Fix the permissions on the static library:</para>
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[84e4cae] | 82 |
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| 83 | <screen><userinput>chmod 644 /usr/lib/libz.a</userinput></screen>
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| 84 |
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[73aedd1d] | 85 | </sect2>
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[24380c7] | 86 |
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[5888299] | 87 |
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[c6cb3aa] | 88 | <sect2 id="contents-zlib" role="content"><title>Contents of Zlib</title>
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[673b0d8] | 89 |
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[81fd230] | 90 | <segmentedlist>
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| 91 | <segtitle>Installed libraries</segtitle>
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[bc2136e] | 92 | <seglistitem><seg>libz.[a,so]</seg></seglistitem>
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[81fd230] | 93 | </segmentedlist>
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| 94 |
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| 95 | <variablelist><bridgehead renderas="sect3">Short Descriptions</bridgehead>
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| 96 | <?dbfo list-presentation="list"?>
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[8f97096] | 97 | <?dbhtml list-presentation="table"?>
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[81fd230] | 98 |
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| 99 | <varlistentry id="libz">
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| 100 | <term><filename class="libraryfile">libz</filename></term>
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| 101 | <listitem>
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[e2c3fb9] | 102 | <para>Contains compression and decompression
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[81fd230] | 103 | functions used by some programs</para>
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| 104 | <indexterm zone="ch-system-zlib libz"><primary sortas="c-libz">libz</primary></indexterm>
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| 105 | </listitem>
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| 106 | </varlistentry>
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| 107 | </variablelist>
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[673b0d8] | 108 |
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| 109 | </sect2>
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| 110 |
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| 111 | </sect1>
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[81fd230] | 112 |
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