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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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603 lines
36 KiB
HTML
603 lines
36 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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.nav-footer{text-align: center; margin-top: auto;}
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|
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</head>
|
||
<body id="module-info" class="article">
|
||
<div id="header">
|
||
<h1>Linux Kernel Module Cheat</h1>
|
||
</div>
|
||
<div id="content">
|
||
<div class="sect3">
|
||
<h4 id="module-info"><a class="anchor" href="#module-info"></a><a class="link" href="#module-info">17.5.3. MODULE_INFO</a></h4>
|
||
<div class="paragraph">
|
||
<p>Module metadata is stored on module files at compile time. Some of the fields can be retrieved through the <code>THIS_MODULE</code> <code>struct module</code>:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>insmod module_info.ko</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Dmesg output:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>name = module_info
|
||
version = 1.0</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Source: <a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/kernel_modules/module_info.c">kernel_modules/module_info.c</a></p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Some of those are also present on sysfs:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>cat /sys/module/module_info/version</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Output:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>1.0</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>And we can also observe them with the <code>modinfo</code> command line utility:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>modinfo module_info.ko</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>sample output:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>filename: module_info.ko
|
||
license: GPL
|
||
version: 1.0
|
||
srcversion: AF3DE8A8CFCDEB6B00E35B6
|
||
depends:
|
||
vermagic: 4.17.0 SMP mod_unload modversions</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Module information is stored in a special <code>.modinfo</code> section of the ELF file:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./run-toolchain readelf -- -SW "$(./getvar kernel_modules_build_subdir)/module_info.ko"</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>contains:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre> [ 5] .modinfo PROGBITS 0000000000000000 0000d8 000096 00 A 0 0 8</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>and:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./run-toolchain readelf -- -x .modinfo "$(./getvar kernel_modules_build_subdir)/module_info.ko"</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>gives:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre> 0x00000000 6c696365 6e73653d 47504c00 76657273 license=GPL.vers
|
||
0x00000010 696f6e3d 312e3000 61736466 3d717765 ion=1.0.asdf=qwe
|
||
0x00000020 72000000 00000000 73726376 65727369 r.......srcversi
|
||
0x00000030 6f6e3d41 46334445 38413843 46434445 on=AF3DE8A8CFCDE
|
||
0x00000040 42364230 30453335 42360000 00000000 B6B00E35B6......
|
||
0x00000050 64657065 6e64733d 006e616d 653d6d6f depends=.name=mo
|
||
0x00000060 64756c65 5f696e66 6f007665 726d6167 dule_info.vermag
|
||
0x00000070 69633d34 2e31372e 3020534d 50206d6f ic=4.17.0 SMP mo
|
||
0x00000080 645f756e 6c6f6164 206d6f64 76657273 d_unload modvers
|
||
0x00000090 696f6e73 2000 ions .</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>I think a dedicated section is used to allow the Linux kernel and command line tools to easily parse that information from the ELF file as we’ve done with <code>readelf</code>.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Bibliography:</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
<li>
|
||
<p><a href="https://stackoverflow.com/questions/19467150/significance-of-this-module-in-linux-driver/49812248#49812248" class="bare">https://stackoverflow.com/questions/19467150/significance-of-this-module-in-linux-driver/49812248#49812248</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="https://stackoverflow.com/questions/4839024/how-to-find-the-version-of-a-compiled-kernel-module/42556565#42556565" class="bare">https://stackoverflow.com/questions/4839024/how-to-find-the-version-of-a-compiled-kernel-module/42556565#42556565</a></p>
|
||
</li>
|
||
<li>
|
||
<p><a href="https://unix.stackexchange.com/questions/238167/how-to-understand-the-modinfo-output" class="bare">https://unix.stackexchange.com/questions/238167/how-to-understand-the-modinfo-output</a></p>
|
||
</li>
|
||
</ul>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph nav-footer">
|
||
<p>← Previous: <a href="kernel-module-dependencies-with-modprobe.html">Kernel module dependencies with modprobe</a> | ↑ Up: <a href="kernel-module-apis.html">Kernel module APIs</a> | ⌂ Home: <a href="README.html">Linux Kernel Module Cheat</a> | Next: <a href="vermagic.html">vermagic</a> →</p>
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