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seL4 Microkernel

Introduction

seL4 is a high-performance, highly secure microkernel designed for safety-critical systems. It is formally verified, meaning its implementation has been mathematically proven to correctly implement its specification and enforce key security properties.

Key Features

  • Formal Verification: seL4 is the world's first operating system kernel with a complete formal proof of implementation correctness and security enforcement.
  • High Performance: seL4 achieves benchmark-setting performance, often an order of magnitude faster than other microkernels.
  • Minimal Trusted Computing Base (TCB): The seL4 kernel itself is extremely small, only around 10,000 lines of code, minimizing the attack surface.
  • Capability-Based Security: seL4 uses unforgeable tokens called capabilities to represent and delegate access rights.
  • Multicore Support: seL4 supports multicore processors on architectures like ARM and x86.

Architecture

seL4 is a member of the L4 family of microkernels. It provides only the minimal mechanisms necessary for processes to communicate and share resources, with all other operating system services running as user-level servers.

The small size of the seL4 kernel allows it to be formally verified. The verification proves that seL4 correctly implements its specification, and that the specification enforces key security properties like spatial isolation between processes.

Use Cases

seL4 is suitable for a wide range of embedded and cyber-physical systems, especially those with security and safety requirements. Example use cases include:

  • Automotive systems
  • Avionics and aerospace systems
  • Medical devices
  • Industrial control systems
  • Secure network devices

Availability

seL4 is open source software, available under permissive licenses. It runs on ARM, x86, and RISC-V architectures.

The seL4 Foundation promotes the development and adoption of seL4 and its ecosystem.

Conclusion

With its unique combination of formal verification, high performance, and security features, seL4 is a compelling choice for building highly assured systems. Its small size and open source nature make it suitable for a wide range of applications.

Overview

  • Type: Microkernel
  • Release Year: 2009 (open-sourced in 2014)
  • Key Features:
    • Formal verification for correctness and security
    • Fine-grained capability-based access control
    • Minimal TCB for enhanced security
    • High performance suitable for real-time systems
  • Use Cases: Automotive systems, avionics, medical devices, industrial control systems
  • Current Management: Maintained by the seL4 Foundation

For more detailed information about seL4, visit the official seL4 website.

About

No description, website, or topics provided.

Resources

Readme
Activity
Custom properties

Stars

0 stars

Watchers

1 watching

Forks

0 forks
Report repository

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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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seL4 Microkernel
Introduction
seL4 is a high-performance, highly secure microkernel designed for safety-critical systems. It is formally verified, meaning its implementation has been mathematically proven to correctly implement its specification and enforce key security properties.
Key Features
  • Formal Verification: seL4 is the world's first operating system kernel with a complete formal proof of implementation correctness and security enforcement.
  • High Performance: seL4 achieves benchmark-setting performance, often an order of magnitude faster than other microkernels.
  • Minimal Trusted Computing Base (TCB): The seL4 kernel itself is extremely small, only around 10,000 lines of code, minimizing the attack surface.
  • Capability-Based Security: seL4 uses unforgeable tokens called capabilities to represent and delegate access rights.
  • Multicore Support: seL4 supports multicore processors on architectures like ARM and x86.
Architecture
seL4 is a member of the L4 family of microkernels. It provides only the minimal mechanisms necessary for processes to communicate and share resources, with all other operating system services running as user-level servers.
The small size of the seL4 kernel allows it to be formally verified. The verification proves that seL4 correctly implements its specification, and that the specification enforces key security properties like spatial isolation between processes.
Use Cases
seL4 is suitable for a wide range of embedded and cyber-physical systems, especially those with security and safety requirements. Example use cases include:
  • Automotive systems
  • Avionics and aerospace systems
  • Medical devices
  • Industrial control systems
  • Secure network devices
Availability
seL4 is open source software, available under permissive licenses. It runs on ARM, x86, and RISC-V architectures.
The seL4 Foundation promotes the development and adoption of seL4 and its ecosystem.
Conclusion
With its unique combination of formal verification, high performance, and security features, seL4 is a compelling choice for building highly assured systems. Its small size and open source nature make it suitable for a wide range of applications.
Overview
  • Type: Microkernel
  • Release Year: 2009 (open-sourced in 2014)
  • Key Features:

    • Formal verification for correctness and security
    • Fine-grained capability-based access control
    • Minimal TCB for enhanced security
    • High performance suitable for real-time systems
  • Use Cases: Automotive systems, avionics, medical devices, industrial control systems
  • Current Management: Maintained by the seL4 Foundation
For more detailed information about seL4, visit the official seL4 website.
About
No description, website, or topics provided.
Resources
Readme
Activity
Custom properties
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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seL4 Microkernel
Introduction
seL4 is a high-performance, highly secure microkernel designed for safety-critical systems. It is formally verified, meaning its implementation has been mathematically proven to correctly implement its specification and enforce key security properties.
Key Features
  • Formal Verification: seL4 is the world's first operating system kernel with a complete formal proof of implementation correctness and security enforcement.
  • High Performance: seL4 achieves benchmark-setting performance, often an order of magnitude faster than other microkernels.
  • Minimal Trusted Computing Base (TCB): The seL4 kernel itself is extremely small, only around 10,000 lines of code, minimizing the attack surface.
  • Capability-Based Security: seL4 uses unforgeable tokens called capabilities to represent and delegate access rights.
  • Multicore Support: seL4 supports multicore processors on architectures like ARM and x86.
Architecture
seL4 is a member of the L4 family of microkernels. It provides only the minimal mechanisms necessary for processes to communicate and share resources, with all other operating system services running as user-level servers.
The small size of the seL4 kernel allows it to be formally verified. The verification proves that seL4 correctly implements its specification, and that the specification enforces key security properties like spatial isolation between processes.
Use Cases
seL4 is suitable for a wide range of embedded and cyber-physical systems, especially those with security and safety requirements. Example use cases include:
  • Automotive systems
  • Avionics and aerospace systems
  • Medical devices
  • Industrial control systems
  • Secure network devices
Availability
seL4 is open source software, available under permissive licenses. It runs on ARM, x86, and RISC-V architectures.
The seL4 Foundation promotes the development and adoption of seL4 and its ecosystem.
Conclusion
With its unique combination of formal verification, high performance, and security features, seL4 is a compelling choice for building highly assured systems. Its small size and open source nature make it suitable for a wide range of applications.
Overview
  • Type: Microkernel
  • Release Year: 2009 (open-sourced in 2014)
  • Key Features:

    • Formal verification for correctness and security
    • Fine-grained capability-based access control
    • Minimal TCB for enhanced security
    • High performance suitable for real-time systems
  • Use Cases: Automotive systems, avionics, medical devices, industrial control systems
  • Current Management: Maintained by the seL4 Foundation
For more detailed information about seL4, visit the official seL4 website.
About
No description, website, or topics provided.
Resources
Readme
Activity
Custom properties
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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sel4
sel4
README.md
README.md
Repository files navigation
seL4 Microkernel
Introduction
seL4 is a high-performance, highly secure microkernel designed for safety-critical systems. It is formally verified, meaning its implementation has been mathematically proven to correctly implement its specification and enforce key security properties.
Key Features
  • Formal Verification: seL4 is the world's first operating system kernel with a complete formal proof of implementation correctness and security enforcement.
  • High Performance: seL4 achieves benchmark-setting performance, often an order of magnitude faster than other microkernels.
  • Minimal Trusted Computing Base (TCB): The seL4 kernel itself is extremely small, only around 10,000 lines of code, minimizing the attack surface.
  • Capability-Based Security: seL4 uses unforgeable tokens called capabilities to represent and delegate access rights.
  • Multicore Support: seL4 supports multicore processors on architectures like ARM and x86.
Architecture
seL4 is a member of the L4 family of microkernels. It provides only the minimal mechanisms necessary for processes to communicate and share resources, with all other operating system services running as user-level servers.
The small size of the seL4 kernel allows it to be formally verified. The verification proves that seL4 correctly implements its specification, and that the specification enforces key security properties like spatial isolation between processes.
Use Cases
seL4 is suitable for a wide range of embedded and cyber-physical systems, especially those with security and safety requirements. Example use cases include:
  • Automotive systems
  • Avionics and aerospace systems
  • Medical devices
  • Industrial control systems
  • Secure network devices
Availability
seL4 is open source software, available under permissive licenses. It runs on ARM, x86, and RISC-V architectures.
The seL4 Foundation promotes the development and adoption of seL4 and its ecosystem.
Conclusion
With its unique combination of formal verification, high performance, and security features, seL4 is a compelling choice for building highly assured systems. Its small size and open source nature make it suitable for a wide range of applications.
Overview
  • Type: Microkernel
  • Release Year: 2009 (open-sourced in 2014)
  • Key Features:

    • Formal verification for correctness and security
    • Fine-grained capability-based access control
    • Minimal TCB for enhanced security
    • High performance suitable for real-time systems
  • Use Cases: Automotive systems, avionics, medical devices, industrial control systems
  • Current Management: Maintained by the seL4 Foundation
For more detailed information about seL4, visit the official seL4 website.
About
No description, website, or topics provided.
Resources
Readme
Activity
Custom properties
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

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5 Commits
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seL4_tutorials
sel4
sel4
README.md
README.md
Repository files navigation
seL4 Microkernel
Introduction
seL4 is a high-performance, highly secure microkernel designed for safety-critical systems. It is formally verified, meaning its implementation has been mathematically proven to correctly implement its specification and enforce key security properties.
Key Features
  • Formal Verification: seL4 is the world's first operating system kernel with a complete formal proof of implementation correctness and security enforcement.
  • High Performance: seL4 achieves benchmark-setting performance, often an order of magnitude faster than other microkernels.
  • Minimal Trusted Computing Base (TCB): The seL4 kernel itself is extremely small, only around 10,000 lines of code, minimizing the attack surface.
  • Capability-Based Security: seL4 uses unforgeable tokens called capabilities to represent and delegate access rights.
  • Multicore Support: seL4 supports multicore processors on architectures like ARM and x86.
Architecture
seL4 is a member of the L4 family of microkernels. It provides only the minimal mechanisms necessary for processes to communicate and share resources, with all other operating system services running as user-level servers.
The small size of the seL4 kernel allows it to be formally verified. The verification proves that seL4 correctly implements its specification, and that the specification enforces key security properties like spatial isolation between processes.
Use Cases
seL4 is suitable for a wide range of embedded and cyber-physical systems, especially those with security and safety requirements. Example use cases include:
  • Automotive systems
  • Avionics and aerospace systems
  • Medical devices
  • Industrial control systems
  • Secure network devices
Availability
seL4 is open source software, available under permissive licenses. It runs on ARM, x86, and RISC-V architectures.
The seL4 Foundation promotes the development and adoption of seL4 and its ecosystem.
Conclusion
With its unique combination of formal verification, high performance, and security features, seL4 is a compelling choice for building highly assured systems. Its small size and open source nature make it suitable for a wide range of applications.
Overview
  • Type: Microkernel
  • Release Year: 2009 (open-sourced in 2014)
  • Key Features:

    • Formal verification for correctness and security
    • Fine-grained capability-based access control
    • Minimal TCB for enhanced security
    • High performance suitable for real-time systems
  • Use Cases: Automotive systems, avionics, medical devices, industrial control systems
  • Current Management: Maintained by the seL4 Foundation
For more detailed information about seL4, visit the official seL4 website.
About
No description, website, or topics provided.
Resources
Readme
Activity
Custom properties
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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5 Commits
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sel4
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Repository files navigation
seL4 Microkernel
Introduction
seL4 is a high-performance, highly secure microkernel designed for safety-critical systems. It is formally verified, meaning its implementation has been mathematically proven to correctly implement its specification and enforce key security properties.
Key Features
  • Formal Verification: seL4 is the world's first operating system kernel with a complete formal proof of implementation correctness and security enforcement.
  • High Performance: seL4 achieves benchmark-setting performance, often an order of magnitude faster than other microkernels.
  • Minimal Trusted Computing Base (TCB): The seL4 kernel itself is extremely small, only around 10,000 lines of code, minimizing the attack surface.
  • Capability-Based Security: seL4 uses unforgeable tokens called capabilities to represent and delegate access rights.
  • Multicore Support: seL4 supports multicore processors on architectures like ARM and x86.
Architecture
seL4 is a member of the L4 family of microkernels. It provides only the minimal mechanisms necessary for processes to communicate and share resources, with all other operating system services running as user-level servers.
The small size of the seL4 kernel allows it to be formally verified. The verification proves that seL4 correctly implements its specification, and that the specification enforces key security properties like spatial isolation between processes.
Use Cases
seL4 is suitable for a wide range of embedded and cyber-physical systems, especially those with security and safety requirements. Example use cases include:
  • Automotive systems
  • Avionics and aerospace systems
  • Medical devices
  • Industrial control systems
  • Secure network devices
Availability
seL4 is open source software, available under permissive licenses. It runs on ARM, x86, and RISC-V architectures.
The seL4 Foundation promotes the development and adoption of seL4 and its ecosystem.
Conclusion
With its unique combination of formal verification, high performance, and security features, seL4 is a compelling choice for building highly assured systems. Its small size and open source nature make it suitable for a wide range of applications.
Overview
  • Type: Microkernel
  • Release Year: 2009 (open-sourced in 2014)
  • Key Features:

    • Formal verification for correctness and security
    • Fine-grained capability-based access control
    • Minimal TCB for enhanced security
    • High performance suitable for real-time systems
  • Use Cases: Automotive systems, avionics, medical devices, industrial control systems
  • Current Management: Maintained by the seL4 Foundation
For more detailed information about seL4, visit the official seL4 website.
About
No description, website, or topics provided.
Resources
Readme
Activity
Custom properties
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

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5 Commits
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sel4
sel4
README.md
README.md
Repository files navigation
seL4 Microkernel
Introduction
seL4 is a high-performance, highly secure microkernel designed for safety-critical systems. It is formally verified, meaning its implementation has been mathematically proven to correctly implement its specification and enforce key security properties.
Key Features
  • Formal Verification: seL4 is the world's first operating system kernel with a complete formal proof of implementation correctness and security enforcement.
  • High Performance: seL4 achieves benchmark-setting performance, often an order of magnitude faster than other microkernels.
  • Minimal Trusted Computing Base (TCB): The seL4 kernel itself is extremely small, only around 10,000 lines of code, minimizing the attack surface.
  • Capability-Based Security: seL4 uses unforgeable tokens called capabilities to represent and delegate access rights.
  • Multicore Support: seL4 supports multicore processors on architectures like ARM and x86.
Architecture
seL4 is a member of the L4 family of microkernels. It provides only the minimal mechanisms necessary for processes to communicate and share resources, with all other operating system services running as user-level servers.
The small size of the seL4 kernel allows it to be formally verified. The verification proves that seL4 correctly implements its specification, and that the specification enforces key security properties like spatial isolation between processes.
Use Cases
seL4 is suitable for a wide range of embedded and cyber-physical systems, especially those with security and safety requirements. Example use cases include:
  • Automotive systems
  • Avionics and aerospace systems
  • Medical devices
  • Industrial control systems
  • Secure network devices
Availability
seL4 is open source software, available under permissive licenses. It runs on ARM, x86, and RISC-V architectures.
The seL4 Foundation promotes the development and adoption of seL4 and its ecosystem.
Conclusion
With its unique combination of formal verification, high performance, and security features, seL4 is a compelling choice for building highly assured systems. Its small size and open source nature make it suitable for a wide range of applications.
Overview
  • Type: Microkernel
  • Release Year: 2009 (open-sourced in 2014)
  • Key Features:

    • Formal verification for correctness and security
    • Fine-grained capability-based access control
    • Minimal TCB for enhanced security
    • High performance suitable for real-time systems
  • Use Cases: Automotive systems, avionics, medical devices, industrial control systems
  • Current Management: Maintained by the seL4 Foundation
For more detailed information about seL4, visit the official seL4 website.
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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seL4 Microkernel
Introduction
seL4 is a high-performance, highly secure microkernel designed for safety-critical systems. It is formally verified, meaning its implementation has been mathematically proven to correctly implement its specification and enforce key security properties.
Key Features
  • Formal Verification: seL4 is the world's first operating system kernel with a complete formal proof of implementation correctness and security enforcement.
  • High Performance: seL4 achieves benchmark-setting performance, often an order of magnitude faster than other microkernels.
  • Minimal Trusted Computing Base (TCB): The seL4 kernel itself is extremely small, only around 10,000 lines of code, minimizing the attack surface.
  • Capability-Based Security: seL4 uses unforgeable tokens called capabilities to represent and delegate access rights.
  • Multicore Support: seL4 supports multicore processors on architectures like ARM and x86.
Architecture
seL4 is a member of the L4 family of microkernels. It provides only the minimal mechanisms necessary for processes to communicate and share resources, with all other operating system services running as user-level servers.
The small size of the seL4 kernel allows it to be formally verified. The verification proves that seL4 correctly implements its specification, and that the specification enforces key security properties like spatial isolation between processes.
Use Cases
seL4 is suitable for a wide range of embedded and cyber-physical systems, especially those with security and safety requirements. Example use cases include:
  • Automotive systems
  • Avionics and aerospace systems
  • Medical devices
  • Industrial control systems
  • Secure network devices
Availability
seL4 is open source software, available under permissive licenses. It runs on ARM, x86, and RISC-V architectures.
The seL4 Foundation promotes the development and adoption of seL4 and its ecosystem.
Conclusion
With its unique combination of formal verification, high performance, and security features, seL4 is a compelling choice for building highly assured systems. Its small size and open source nature make it suitable for a wide range of applications.
Overview
  • Type: Microkernel
  • Release Year: 2009 (open-sourced in 2014)
  • Key Features:

    • Formal verification for correctness and security
    • Fine-grained capability-based access control
    • Minimal TCB for enhanced security
    • High performance suitable for real-time systems
  • Use Cases: Automotive systems, avionics, medical devices, industrial control systems
  • Current Management: Maintained by the seL4 Foundation
For more detailed information about seL4, visit the official seL4 website.
About
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1 watching
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