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https://github.com/cirosantilli/linux-kernel-module-cheat.git
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569 lines
36 KiB
HTML
569 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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</head>
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<body id="your-first-binutils-hack" class="article">
|
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<div id="header">
|
||
<h1>Linux Kernel Module Cheat</h1>
|
||
</div>
|
||
<div id="content">
|
||
<div class="sect4">
|
||
<h5 id="your-first-binutils-hack"><a class="anchor" href="#your-first-binutils-hack"></a><a class="link" href="#your-first-binutils-hack">2.2.2.4. Your first Binutils hack</a></h5>
|
||
<div class="paragraph">
|
||
<p>Have you ever felt that a single <code>inc</code> instruction was not enough? Really? Me too!</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>So let’s hack the <a href="gnu-gas-assembler.html">GNU GAS assembler</a>, which is part of <a href="https://en.wikipedia.org/wiki/GNU_Binutils">GNU Binutils</a>, to add a new shiny version of <code>inc</code> called…​ <code>myinc</code>!</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>GCC uses GNU GAS as its backend, so we will test out new mnemonic with an <a href="gcc-inline-assembly.html">GCC inline assembly</a> test program: <a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/userland/arch/x86_64/binutils_hack.c">userland/arch/x86_64/binutils_hack.c</a>, which is just a copy of <a href="https://github.com/cirosantilli/linux-kernel-module-cheat/blob/master/userland/arch/x86_64/binutils_nohack.c">userland/arch/x86_64/binutils_nohack.c</a> but with <code>myinc</code> instead of <code>inc</code>.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>The inline assembly is disabled with an <code>#ifdef</code>, so first modify the source to enable that.</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Then, try to build userland:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./build-userland</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>and watch it fail with:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>binutils_hack.c:8: Error: no such instruction: `myinc %rax'</pre>
|
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</div>
|
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</div>
|
||
<div class="paragraph">
|
||
<p>Now, edit the file</p>
|
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</div>
|
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<div class="literalblock">
|
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<div class="content">
|
||
<pre>vim submodules/binutils-gdb/opcodes/i386-tbl.h</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>and add a copy of the <code>"inc"</code> instruction just next to it, but with the new name <code>"myinc"</code>:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>diff --git a/opcodes/i386-tbl.h b/opcodes/i386-tbl.h
|
||
index af583ce578..3cc341f303 100644
|
||
--- a/opcodes/i386-tbl.h
|
||
+++ b/opcodes/i386-tbl.h
|
||
@@ -1502,6 +1502,19 @@ const insn_template i386_optab[] =
|
||
{ { { 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||
0, 0, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0,
|
||
1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0 } } } },
|
||
+ { "myinc", 1, 0xfe, 0x0, 1,
|
||
+ { { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 } },
|
||
+ { 0, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||
+ 0, 1, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0,
|
||
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||
+ 0, 0, 0, 0, 0, 0 },
|
||
+ { { { 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||
+ 0, 0, 1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0,
|
||
+ 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0 } } } },
|
||
{ "sub", 2, 0x28, None, 1,
|
||
{ { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Finally, rebuild Binutils, userland and test our program with <a href="user-mode-simulation.html">User mode simulation</a>:</p>
|
||
</div>
|
||
<div class="literalblock">
|
||
<div class="content">
|
||
<pre>./build-buildroot -- host-binutils-rebuild
|
||
./build-userland --static
|
||
./run --static --userland userland/arch/x86_64/binutils_hack.c</pre>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>and we se that <code>myinc</code> worked since the assert did not fail!</p>
|
||
</div>
|
||
<div class="paragraph">
|
||
<p>Tested on b60784d59bee993bf0de5cde6c6380dd69420dda + 1.</p>
|
||
</div>
|
||
<div class="ulist">
|
||
<ul>
|
||
</ul>
|
||
</div>
|
||
</div>
|
||
<div class="paragraph nav-footer">
|
||
<p>← Previous: <a href="your-first-glibc-hack.html">Your first glibc hack</a> | ↑ Up: <a href="how-to-hack-stuff.html">How to hack stuff</a> | ⌂ Home: <a href="README.html">Linux Kernel Module Cheat</a> | Next: <a href="your-first-gcc-hack.html">Your first GCC hack</a> →</p>
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