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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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578 lines
35 KiB
HTML
578 lines
35 KiB
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<meta name="description" content="The perfect emulation setup to study and develop the <<linux-kernel>> v5.9.2, kernel modules, <<qemu-buildroot-setup,QEMU>>, <<gem5-buildroot-setup,gem5>> and x86_64, ARMv7 and ARMv8 <<userland-assembly,userland>> and <<baremetal-setup,baremetal>> assembly, <<c,ANSI C>>, <<cpp,C++>> and <<posix,POSIX>>. EVERYTHING is built from source. <<gdb>> and <<kgdb>> just work. Powered by <<about-the-qemu-buildroot-setup,Buildroot>> and <<about-the-baremetal-setup,crosstool-NG>>. Highly automated. Thoroughly documented. Automated <<test-this-repo,tests>>. "Tested" in an Ubuntu 20.04 host.">
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<title>Linux Kernel Module Cheat</title>
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|
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</head>
|
||
<body id="selinux" class="article">
|
||
<div id="header">
|
||
<h1>Linux Kernel Module Cheat</h1>
|
||
</div>
|
||
<div id="content">
|
||
<div class="sect4">
|
||
<h5 id="selinux"><a class="anchor" href="#selinux"></a><a class="link" href="#selinux">17.14.2.1. SELinux</a></h5>
|
||
<div class="paragraph">
|
||
<p>TODO get a hello world permission control working:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./build-linux \
|
||
--config-fragment linux_config/selinux \
|
||
--linux-build-id selinux \
|
||
;
|
||
./build-buildroot --config 'BR2_PACKAGE_REFPOLICY=y'
|
||
./run --enable-kvm --linux-build-id selinux</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Source: <a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/linux_config/selinux">linux_config/selinux</a></p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>This builds:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p><code>BR2_PACKAGE_REFPOLICY</code>, which includes a reference <code>/etc/selinux/config</code> policy: <a href="https://github.com/SELinuxProject/refpolicy" class="bare">https://github.com/SELinuxProject/refpolicy</a></p>
|
||
<div class="paragraph">
|
||
<p>refpolicy in turn depends on:</p>
|
||
</div>
|
||
</li>
|
||
<li>
|
||
<p><code>BR2_PACKAGE_SETOOLS</code>, which contains tools such as <code>getenforced</code>: <a href="https://github.com/SELinuxProject/setools" class="bare">https://github.com/SELinuxProject/setools</a></p>
|
||
<div class="paragraph">
|
||
<p>setools depends on:</p>
|
||
</div>
|
||
</li>
|
||
<li>
|
||
<p><code>BR2_PACKAGE_LIBSELINUX</code>, which is the backing userland library</p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>After boot finishes, we see:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>Starting auditd: mkdir: invalid option -- 'Z'</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>which comes from <code>/etc/init.d/S01auditd</code>, because BusyBox' <code>mkdir</code> does not have the crazy <code>-Z</code> option like Ubuntu. That’s amazing!</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>The kernel logs contain:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>SELinux: Initializing.</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Inside the guest we now have:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>getenforce</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>which initially says:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>Disabled</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>TODO: if we try to enforce:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>setenforce 1</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>it does not work and outputs:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>setenforce: SELinux is disabled</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>SELinux requires glibc as mentioned at: <a href="libc-choice.html">Section 26.10, “libc choice”</a>.</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph nav-footer">
|
||
<p>↑ Up: <a href="linux-security-modules.html">Linux security modules</a> | ⌂ Home: <a href="README.html">Linux Kernel Module Cheat</a> | Next: <a href="user-mode-linux.html">User mode Linux</a> →</p>
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