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Use Linux FHS plus /usr/ merge for paths

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documentation/hardened_malloc.xhtml
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<!DOCTYPE html>
<!-- Inferencium - Website - Documentation - hardened_malloc -->
<!-- Version: 5.0.1 -->
<!-- Version: 5.0.2-alpha.1 -->
<!-- Copyright 2023 Jake Winters -->
<!-- SPDX-License-Identifier: BSD-3-Clause -->
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<p>This documentation contains instructions to use
<a href="https://github.com/GrapheneOS/hardened_malloc">hardened_malloc</a>
memory allocator as the system's default memory allocator. These instructions apply to both musl and
glibc C libraries on Unix-based and Unix-like systems.</p>
glibc C libraries on Linux-based systems.</p>
<p>hardened_malloc can also be used per-application and/or per-user, in which case root permissions are
not required; this documentation focuses on system-wide usage of hardened_malloc, assumes root
privileges, and assumes the compiled library will be located in a path readable and executable by all
users of the system.</p>
<p>This documentation uses
<a href="https://refspecs.linuxfoundation.org/FHS_3.0/fhs/index.html">Linux Filesystem Hierarchy Standard</a>
paths, with the modern <code>/usr/</code> merge approach of most Linux distributions. For non-standard
configurations, adjust the paths accordingly.</p>
<p>For the complete hardened_malloc documentation, visit its
<a href="https://github.com/GrapheneOS/hardened_malloc#hardened_malloc">official documentation</a>.</p>
<p>This documentation is also available in portable AsciiDoc format in my
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</section>
<section id="copy_library">
<h2><a href="#copy_library">Copy Compiled hardened_malloc Library</a></h2>
<p><code># cp out/libhardened_malloc.so <var>&lt;target path&gt;</var></code></p>
<p><code># cp out/libhardened_malloc.so /usr/local/lib/libhardened_malloc.so</code></p>
</section>
<section id="preload_on_boot">
<h2><a href="#preload_on_boot">Set System to Preload hardened_malloc on Boot</a></h2>
<p><b>musl-based systems:</b> Add <code>LD_PRELOAD=<var>&lt;hardened_malloc path&gt;</var></code> to
<p><b>musl-based systems:</b> Add <code>LD_PRELOAD=/usr/local/lib/libhardened_malloc.so</code> to
<code>/etc/environment</code></p>
<p><b>glibc-based systems:</b> Add <code><var>&lt;hardened_malloc path&gt;</var></code> to
<p><b>glibc-based systems:</b> Add <code>/usr/local/lib/libhardened_malloc.so</code> to
<code>/etc/ld.so.preload</code></p>
</section>
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