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<li class=""><a href="/website_pr_hosting/PR_401/">Home</a></li><li class="dropdown active"><a class="dropdown-toggle" data-toggle="dropdown" href="/website_pr_hosting/PR_401/About/">What is seL4? <span class="caret"></span></a>
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<h1>
About seL4
</h1>
<a href="seL4-whitepaper.pdf">
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style="width: 15%;">
<div class="row">
<img style=
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<p>
seL4 is a high-assurance, high-performance operating system
microkernel. It is unique because of its comprehensive formal
verification, without compromising <a href=
"Performance/">performance</a>. It is meant to be used as a
trustworthy foundation for building safety- and security-critical
systems. It is available as open source on <a href=
"https://github.com/seL4/">GitHub</a> and supported by the
<a href="../Foundation/">seL4 Foundation</a>.
</p>
<p>
<img style="width: 250px; margin-left: 10px; float: right;"
src="../images/trusted.svg"
alt="seL4 system" />
Being a <em>kernel</em> means it is the piece
of software that runs at the heart of any software system and
controls all accesses to resources. It provides fine-grained
access control through <a href=
"https://en.wikipedia.org/wiki/Capability-based_security">capabilities</a>,
and controls communication between components of the system.
It is the most critical part of the software system, and runs
in privileged mode.
</p>
<p>
Being a microkernel means that it is reduced to a minimal core
that is free from policy and therefore can form a dependable base
for building arbitrary systems serving many different usage
scenarios.
</p>
<p>
seL4 is a member of the <a title=
"L4 microkernel family on wikipedia"
href="https://en.wikipedia.org/wiki/L4_microkernel_family">L4 family of
microkernels</a>, and is the world's most advanced, most
highly assured operating-system kernel.
</p>
<p>
seL4's formal verification sets it apart from any other operating
system. In a nutshell, it provides the highest assurance of
<em>isolation</em> between applications running in the system,
meaning that a compromise in one part of the system can be
contained and prevented from harming other, potentially more
critical parts of the system.
</p>
<p>
Specifically, seL4's implementation is formally (mathematically)
proven correct (bug-free) against its specification, has been
proved to enforce strong security properties, and if configured
correctly its operations have proven safe upper bounds on their
worst-case execution times. It was the world's first operating
system with such a proof, and is still the only proven operating
system featuring fine-grained capability-based security and high
performance. It also has the most advanced support for <a href=
"https://en.wikipedia.org/wiki/Mixed_criticality">mixed
criticality real-time systems</a>.
</p>
<p>
For detailed explanations of these terms, see our <a href=
"https://docs.sel4.systems/projects/sel4/frequently-asked-questions.html">FAQ</a>.
</p>
<p>
In 2009, the seL4 kernel was a scientific breakthrough result
from the <a href="http://trustworthy.systems/">Trustworthy Systems
group</a> (TS) that showed that high-performance kernels are
within the realm of formal verification. Today, seL4 is part of
an ecosystem supporting active use in various domains including
automotive, aviation, infrastructure, medical, and defence. A key
highlight demonstrating its fit for real-world deployment was in
the DARPA-funded <a href=
"http://trustworthy.systems/projects/TS/SMACCM/">HACMS</a>
program, where seL4 was used to protect an autonomous helicopter
against cyber-attacks. TS continues to push the state of the art
of operating systems through <a href=
"http://trustworthy.systems/projects/seL4/">seL4</a>, in close
cooperation with its partners in the seL4 Foundation.
</p>

<p>
More on TS ongoing and future <a
href="../Info/more-research.html">research</a> about seL4 and trustworthy
systems.
</p>

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Copyright &copy; 2024 seL4 Project a Series of LF Projects, LLC.<br/>
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For trademark usage guidelines, privacy and cookie policies,
and other applicable policies, as well as terms and conditions
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