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#System Calls

Showing: 83 courses
Linux Plumbers Conference

Demystifying Proxy Execution

0 rewiews
Explore proxy execution in Linux systems, understanding its mechanisms, challenges, and potential solutions for improved performance and security.
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1 Lesons
22 minutes
On-Demand
Free-Video

Linux Course - Engineering, UGC-NET - Ravindrababu Ravula

0 rewiews
Comprehensive Linux training covering history, commands, kernel types, file systems, system calls, shell programming, and processes. Ideal for engineering and UGC-NET preparation.
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14 Lesons
10 hours
On-Demand
Free-Video
Write your own Operating System

Write Your Own Operating System - System Calls, POSIX Compliance

0 rewiews
Learn to implement system calls and achieve POSIX compliance in operating system development, enabling effective communication between user-space programs and the kernel.
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5 Lesons
32 minutes
On-Demand
Free-Video
Linux Foundation

Threads in Embedded Linux - 6 Easy Pieces

0 rewiews
Explore concurrent processing in Linux through threads, covering creation, synchronization, and signal handling. Gain practical insights with hands-on demos and tool usage for efficient embedded development.
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1 Lesons
40 minutes
On-Demand
Free-Video
ACM SIGPLAN

Building Dynamic System Call Sandbox with Partial Order Analysis

0 rewiews
Explore dynamic system call sandboxing using partial order analysis to enhance OS security. Learn how to restrict unnecessary system calls and reduce attack surfaces in program execution.
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1 Lesons
19 minutes
On-Demand
Free-Video
Linux Foundation

Fuzzing Linux Drivers with Syzkaller

0 rewiews
Explore Syzkaller for effective Linux driver fuzzing, covering architecture, setup, configuration, and practical use cases to enhance software testing and security.
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16 Lesons
38 minutes
On-Demand
Free-Video
Linux Foundation

Kernelspace Fault Injection with KRF - Discovering Vulnerabilities Through System Call Errors

0 rewiews
Explore kernelspace fault injection with KRF to discover vulnerabilities and improve software resilience through targeted system call error induction and analysis.
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21 Lesons
26 minutes
On-Demand
Free-Video
CNCF [Cloud Native Computing Foundation]

Sandboxing Wasm Programs - Syscall Isolation Techniques for Edge Computing

0 rewiews
Explore Wasm runtime sandboxing techniques, including SELinux, cgroups, and seccomp. Learn about Callander, a novel syscall sandboxing tool, to enhance security in edge computing platforms.
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1 Lesons
26 minutes
On-Demand
Free-Video
OpenInfra Foundation

No More Re-execs: Speeding Up Docker Container Startup Using Runtime LockOSThread

0 rewiews
Dive into the technical challenges and solutions for optimizing Docker container startup times by addressing Go runtime's interaction with Linux unshare system calls and modern workarounds.
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1 Lesons
16 minutes
On-Demand
Free-Video
SNIAVideo

Samba io_uring Status Update and Implementation Design

0 rewiews
Discover how io_uring infrastructure in Linux kernel optimizes data handling, improves CPU core efficiency, and enhances network throughput performance in Samba implementations.
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1 Lesons
30 minutes
On-Demand
Free-Video
Conf42

Using Falco and eBPF to Protect Your Applications

0 rewiews
Explore Falco and eBPF for application protection. Learn about runtime security, syscalls, and Falco's architecture. Discover how to implement, connect, and contribute to this powerful security tool.
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22 Lesons
25 minutes
On-Demand
Free-Video
Rawkode Academy

Introduction to the Kubernetes Seccomp Operator

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Explore Kubernetes Seccomp Operator: enhance security, manage profiles, and implement secure computing mode for improved container isolation and system call control.
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10 Lesons
1 hour 24 minutes
On-Demand
Free-Video
Linux Foundation

Stress-ng: How to Stress Test Your Computer (and Possibly Break It)

0 rewiews
Explore stress-ng, a powerful tool for stress testing kernels and hardware. Learn testing concepts, practical examples, and how to contribute to this essential project for system reliability.
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25 Lesons
1 hour 37 minutes
On-Demand
Free-Video
CodeHelp - by Babbar

System Calls in Operating System - Theory, Example, Hands-on Terminal

0 rewiews
Comprehensive exploration of system calls in operating systems, covering theory, examples, and hands-on terminal practice. Includes user-kernel mode transitions and various types of system calls.
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8 Lesons
28 minutes
On-Demand
Free-Video
CNCF [Cloud Native Computing Foundation]

Generating Security Policies with eBPF - Hands-on Walkthrough

0 rewiews
Explore eBPF-based solutions for capturing security events and generating policies. Learn to leverage tools like seccomp, Inspektor Gadget, and Tetragon for comprehensive system protection.
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1 Lesons
33 minutes
On-Demand
Free-Video
Linux Foundation

Controlling Script Execution in Linux - Security Mechanisms and Challenges

0 rewiews
Explore kernel-managed script execution control in Linux, addressing challenges and implementation approaches for a consistent global policy.
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1 Lesons
46 minutes
On-Demand
Free-Video
Linux Foundation

Strace - Swiss Army Knife to Trace, Analyze, and Debug in Real-Time

0 rewiews
Explore strace's versatile capabilities for tracing, analyzing, and debugging. Learn practical applications through live demos, from file access analysis to real-time timing information collection.
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1 Lesons
47 minutes
On-Demand
Free-Video
Linux Foundation

File System Information Retrieval: fsinfo(), getvalues(), and getxattr() Functions

0 rewiews
Explore file system information retrieval methods with experts Amir Goldstein and Miklos Szeredi, focusing on fsinfo(), getvalues(), and getxattr() functions in Linux systems.
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1 Lesons
32 minutes
On-Demand
Free-Video
Linux Foundation

A New Futex2 System Call

0 rewiews
Explore the new futex2() system call in Linux, its implementation, benefits, and potential impact on synchronization primitives and application performance.
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1 Lesons
24 minutes
On-Demand
Free-Video
Linux Foundation

Efficient Syscall Emulation on Linux

0 rewiews
Explore efficient syscall emulation techniques for Linux, covering architecture-specific challenges, userspace interception, kernel-level filtering, and cross-platform considerations.
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13 Lesons
31 minutes
On-Demand
Free-Video
Linux Foundation

Monitoring Linux Systems Using Kernel Audit Subsystem

0 rewiews
Learn to monitor Linux systems using the Kernel Audit Subsystem. Explore architecture, setup, tools, rules, and event recording for enhanced system security and compliance.
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17 Lesons
1 hour 6 minutes
On-Demand
Free-Video
Docker

What Have Namespaces Done for You Lately? - Writing Containers from Scratch

0 rewiews
Explore container creation from scratch using Go, focusing on namespaces and their impact on resource access and system isolation.
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15 Lesons
33 minutes
On-Demand
Free-Video
Linux Plumbers Conference

A move_pages() Equivalent for Physical Memory

0 rewiews
Proposal for a syscall to migrate physical memory contents between NUMA nodes, exploring integration with mm/migrate.c and potential applications in tiering frameworks.
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1 Lesons
30 minutes
On-Demand
Free-Video
Docker

Securing Containers - One Patch at a Time

0 rewiews
Explore CVE-2016-9962: discovery, implications, and resolution. Dive into kernel boundaries, system calls, and address space randomization for enhanced container security.
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1 Lesons
36 minutes
On-Demand
Free-Video
Linux Foundation

The New Shiny System Call in the Block

0 rewiews
Explore the latest system call innovation with Uber engineer Abhijit Singh, delving into its functionality, implementation, and potential impact on Linux kernel development.
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1 Lesons
55 minutes
On-Demand
Free-Video
Linux Foundation

Implementing BPF_PROG_LOAD_FD

0 rewiews
Explore the implementation of BPF_PROG_LOAD_FD with Neill Kapron, gaining insights into this crucial aspect of Linux kernel programming and eBPF technology.
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1 Lesons
19 minutes
On-Demand
Free-Video
Linux Foundation

Mount API Extensions

0 rewiews
Explore mount API extensions with Christian Brauner, delving into advanced Linux system concepts and their practical applications.
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1 Lesons
35 minutes
On-Demand
Free-Video
Linux Foundation

Fast Uprobes - Enhancing Linux Kernel Tracing

0 rewiews
Explore fast uprobes with Jiri Olsa, learning about their implementation, performance benefits, and practical applications in Linux kernel tracing.
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1 Lesons
31 minutes
On-Demand
Free-Video
Linux Foundation

Tracing the Source of Errors

0 rewiews
Discover effective techniques for identifying and tracing error sources in Linux systems, enhancing debugging skills and improving system reliability.
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1 Lesons
20 minutes
On-Demand
Free-Video
CNCF [Cloud Native Computing Foundation]

Hooking Libc Calls to Debug Kubernetes Apps - When They Go High, We Go Low

0 rewiews
Explore innovative debugging techniques for Kubernetes apps using low-level Rust code to hook libc calls, enabling local testing and debugging in cloud conditions.
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1 Lesons
40 minutes
On-Demand
Free-Video
Linux Foundation

Debugging with Strace - A Peek Behind the Scenes of Linux Processes

0 rewiews
Unravel the mysteries of strace, a powerful Linux debugging tool. Learn system calls, analyze output, and enhance your skills with real-life examples to become a more proficient Linux developer.
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1 Lesons
1 hour 30 minutes
On-Demand
Free-Video
DevConf

Using STRACE to Troubleshoot Userspace Issues - DevConf.CZ 2023

0 rewiews
Explore strace basics and advanced techniques for troubleshooting userspace issues, with practical examples from Red Hat's support team.
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1 Lesons
37 minutes
On-Demand
Free-Video
DevConf

Current State of Netlink Decoding in Strace

0 rewiews
Explore strace's netlink decoding capabilities, implementation, and challenges in protocol design and decoding for Linux system call tracing.
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1 Lesons
34 minutes
On-Demand
Free-Video
DevConf

Modern strace - New Features and Problem-Solving Capabilities - DevConf.CZ 2023

0 rewiews
Explore advanced features of strace for Linux debugging, including seccomp-assisted filtering, syscall tampering, and PID namespace translation.
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1 Lesons
33 minutes
On-Demand
Free-Video
DevConf

Seitan: A Plant-Based Recipe Against Syscall Anxiety

0 rewiews
Explore a unified approach to privilege separation in containers and VMs using Seitan. Learn to write JSON recipes for filtered system calls and enhance security for untrusted workloads.
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1 Lesons
35 minutes
On-Demand
Free-Video
Linux Foundation

Update on Landlock: IOCTL Support

0 rewiews
Explore Landlock security module's features, recent developments, and new IOCTL restriction support for enhanced Linux process sandboxing and security policies.
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1 Lesons
48 minutes
On-Demand
Free-Video
BSidesLV

Catching Linux Post-Exploitation with Auditd

0 rewiews
Learn to detect Linux post-exploitation using Auditd. Explore system calls, audit rules, and attack scenarios for enhanced security monitoring and threat detection.
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23 Lesons
22 minutes
On-Demand
Free-Video
Ekoparty Security Conference

Ekoparty #UniTalks​ Córdoba 2021 - Analizando programas dinámicamente a través de sus syscalls

0 rewiews
Análisis dinámico de programas mediante syscalls para detectar malware. Nueva herramienta desarrollada en proyecto de investigación de UTN, presentada por experto en seguridad informática Germán Parisi.
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1 Lesons
24 minutes
On-Demand
Free-Video
media.ccc.de

Anatomie eines containerfähigen Linux-Kernel-Rootkits

0 rewiews
Einblick in die Implementierung eines containerfähigen Linux-Kernel-Rootkits. Erläutert Rootkits, Container-Technologien und zeigt detailliert die Programmierung eines solchen Rootkits mit Backdoor-Funktionen und Ausbruchsmöglichkeiten.
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16 Lesons
34 minutes
On-Demand
Free-Video
BSidesLV

Is That a Penguin in My Windows?

0 rewiews
Explore Windows Subsystem for Linux: architecture, processes, system calls, and security implications. Learn about cross-process access and Linux-Windows interactions.
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18 Lesons
40 minutes
On-Demand
Free-Video
DefCamp

Emulating Packed Linux Malware Using the Unicorn Emulator Framework - DefCamp - 2019

0 rewiews
Explore Linux malware packing, unpacking techniques, and emulation using Unicorn framework. Learn practical skills for malware analysis and reverse engineering in this hands-on cybersecurity talk.
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39 Lesons
30 minutes
On-Demand
Free-Video
Linux Foundation

The End of Time, 19 Years to Go

0 rewiews
Explore the 2038 time_t overflow issue in Linux, its impact on various systems, and ongoing efforts to address it. Learn about kernel updates, remaining challenges, and future steps for user space solutions.
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11 Lesons
49 minutes
On-Demand
Free-Video
Linux Foundation

Using Seccomp to Limit the Kernel Attack Surface

0 rewiews
Explore seccomp for system call filtering in Linux, covering BPF virtual machine basics, filter examples, and applications in sandboxing and security. Learn implementation techniques and considerations.
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31 Lesons
1 hour 29 minutes
On-Demand
Free-Video
Linux Foundation

KernelShark 1.0 is Here - What Does that Mean?

0 rewiews
Explore KernelShark 1.0, a powerful GUI for Linux kernel tracing. Learn its features, capabilities, and future developments through live demonstrations and insights.
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12 Lesons
34 minutes
On-Demand
Free-Video
Linux Foundation

Zephyr OS Memory Protection

0 rewiews
Explore MPU-based memory protection in Zephyr RTOS, covering security domains, permission management, object allocation, system calls, and IPC mechanisms for embedded systems.
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16 Lesons
35 minutes
On-Demand
Free-Video
Linux Foundation

Speeding Up VM's I/O Sharing Host's io_uring Queues With Guests

0 rewiews
Explore io_uring system calls and their application in virtualization to enhance VM I/O performance through queue sharing between hosts and guests.
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14 Lesons
19 minutes
On-Demand
Free-Video
Black Hat

Hands Off and Putting SLAB - SLUB Feng Shui in a Blackbox

0 rewiews
Automated memory layout manipulation technique for precise system call identification and assembly, enabling desired memory layouts for exploitation in SLAB/SLUB caches.
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30 Lesons
44 minutes
On-Demand
Free-Video
Black Hat

The Linux Kernel Hidden Inside Windows 10

0 rewiews
Explore the Linux kernel in Windows 10, its implementation, security implications, and potential vulnerabilities. Learn about system calls, process management, and attack surfaces in this unique OS integration.
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17 Lesons
52 minutes
On-Demand
Free-Video
Linux Foundation

Sandboxing in Linux with Zero Lines of Code

0 rewiews
Explore Linux sandboxing techniques without coding, focusing on process startup stages and practical examples. Learn to enhance security and control system calls effectively.
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18 Lesons
49 minutes
On-Demand
Free-Video
Linux Foundation

Inside the Linux Security Modules

0 rewiews
Explore Linux Security Modules framework, architecture, and integration. Learn about security data fields, hooks, and configurations for enhanced kernel protection.
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23 Lesons
52 minutes
On-Demand
Free-Video

A Syscall to Arms

0 rewiews
Explore system calls in Windows and Linux, understanding their role in security and exploitation. Learn techniques for analyzing and manipulating syscalls to enhance your cybersecurity skills.
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1 Lesons
44 minutes
On-Demand
Free-Video
USENIX

The Hitchhiker's Guide to Operating Systems

0 rewiews
Innovative approach to teaching operating systems using state transition systems, featuring a minimal OS model with nine system calls and tools for exploring system behaviors.
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1 Lesons
18 minutes
On-Demand
Free-Video
USENIX

VectorVisor - A Binary Translation Scheme for Throughput-Oriented GPU Acceleration

0 rewiews
Explore VectorVisor, a novel GPU acceleration approach for server-side applications, offering improved throughput and cost-efficiency through vectorized binary translation and CPU thread emulation.
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1 Lesons
25 minutes
On-Demand
Free-Video
ACCU Conference

Linux User - Kernel ABI - The Realities of How C and C++ Programs Really Talk to the OS

0 rewiews
Explore the intricacies of Linux system calls, signal handlers, pthreads, and ptrace. Gain insights into low-level interactions between C/C++ programs and the operating system for advanced debugging and optimization.
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1 Lesons
1 hour 26 minutes
On-Demand
Free-Video
linux.conf.au

Introduction to Memory Management

0 rewiews
Explore Linux memory management basics, including paging, hardware mechanisms, and process memory usage. Learn to control overcommit, set limits, and use system calls for effective memory management.
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16 Lesons
46 minutes
On-Demand
Free-Video
CppNow

Under the Hood - Assembly, System Calls, and Hardware in C++

0 rewiews
Explore assembly, system calls, and hardware in C++. Dive deep into low-level computer operations, covering x86-64/Linux, Arm, and other systems. Gain insights into the underlying mechanics of C++ programming.
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1 Lesons
1 hour 29 minutes
On-Demand
Free-Video
BSidesMunich

Indirect Syscalls: A Journey From High to Low

0 rewiews
Dive into the mechanics of system calls, exploring both direct and indirect implementations while understanding their journey from high-level to low-level programming concepts and security implications.
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1 Lesons
27 minutes
On-Demand
Free-Video
DEFCONConference

Process Injection Attacks with Return-Oriented Programming - Advanced Techniques and Methodologies

0 rewiews
Discover advanced process injection techniques using return-oriented programming (ROP), including unique string comparison solutions, multiple WinAPI patterns, and practical methodologies for reliable implementation.
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1 Lesons
23 minutes
On-Demand
Free-Video
Linux Plumbers Conference

Using fexecve for Launch Services - What's Missing?

0 rewiews
Explore the challenges and requirements for implementing fexecve (fd-based execve) in launching services, with insights from JĘDRZEJEWSKI-SZMEK, Zbigniew.
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1 Lesons
23 minutes
On-Demand
Free-Video
Linux Plumbers Conference

Closing the Script Execution Control Gap

0 rewiews
Explore techniques for enhancing script execution control and security in Linux systems. Learn about potential vulnerabilities and mitigation strategies.
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1 Lesons
27 minutes
On-Demand
Free-Video
Conf42

How We Almost Secured Our Project by Writing More Tests

0 rewiews
Explore how increased testing nearly secured a project, delving into code coverage, seccomp profiles, and syscall extraction. Learn about Harpoon and the benefits of libbpfgo in Golang development.
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14 Lesons
18 minutes
On-Demand
Free-Video
Hussein Nasser

Comparing Kernel System Calls Across Runtimes - Performance Analysis

0 rewiews
Explore system call usage across runtimes using strace. Compare file reading performance in Node.js, Bun, Python, and C. Analyze kernel mode switches and their impact.
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7 Lesons
19 minutes
On-Demand
Free-Video
Hussein Nasser

Combined I/O Enhancement in PostgreSQL 17

0 rewiews
Explore PostgreSQL 17's game-changing feature: combined I/Os for faster database operations. Learn about optimized page reads, vectorized I/O, and potential performance impacts.
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6 Lesons
27 minutes
On-Demand
Free-Video
DEFCONConference

Defeating EDR Evading Malware with Memory Forensics

0 rewiews
Discover advanced memory forensics techniques to detect and analyze EDR-evading malware, including system call manipulation, module overwriting, and debug register abuse.
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1 Lesons
44 minutes
On-Demand
Free-Video
x33fcon

Busting Red Team Trends with Style - Building a Custom ETW-Based Sysmon Replacement

0 rewiews
Dive into advanced threat hunting with a custom ETW-based Sysmon replacement, exploring enhanced telemetry capabilities for detecting sophisticated red team techniques and threat actor fingerprinting.
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1 Lesons
33 minutes
On-Demand
Free-Video
DEFCONConference

HookChain: A New Perspective for Bypassing EDR Solutions

0 rewiews
Discover a sophisticated EDR bypass technique combining IAT Hooking, dynamic SSN resolution, and indirect system calls to redirect Windows subsystem execution flow while remaining undetected by traditional security measures.
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1 Lesons
39 minutes
On-Demand
Free-Video
Linux Plumbers Conference

Making Linux Fly: Towards a Certified Linux Kernel

0 rewiews
Explore efforts to create a certified Linux kernel, enhancing reliability and security through formal verification techniques and advanced testing methodologies.
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1 Lesons
43 minutes
On-Demand
Free-Video
Linux Plumbers Conference

Seccomp Filtering for Struct Pointers

0 rewiews
Explore advanced seccomp filtering techniques for struct pointers, enhancing system call security in Linux environments.
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1 Lesons
31 minutes
On-Demand
Free-Video
Linux Plumbers Conference

kfuncs for BPF LSM Use Cases - Lecture

0 rewiews
Explore kfuncs for BPF LSM use cases with experts Liu, Singh, and Bobrowski. Gain insights into advanced Linux security mechanisms and their practical applications.
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1 Lesons
38 minutes
On-Demand
Free-Video
ACM SIGPLAN

WALI: A Thin Linux Kernel Interface for WebAssembly

0 rewiews
Explore WALI, a thin layer enabling WebAssembly to interact seamlessly with Linux systems, enhancing application portability and security while leveraging existing compiler backends.
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1 Lesons
45 minutes
On-Demand
Free-Video
Kernel Recipes

Tracking Down Sources of Kernel Errors with Retsnoop

0 rewiews
Explore kernel error tracking with retsnoop, a BPF-based tool for efficient debugging and introspection without modifying the kernel or using printk().
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1 Lesons
47 minutes
On-Demand
Free-Video
OpenUK

eBPF Superpowers - Platform Engineering

0 rewiews
Explore eBPF's powerful capabilities for enhancing Linux kernel functionality and revolutionizing networking, security, and observability in modern systems.
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1 Lesons
38 minutes
On-Demand
Free-Video
DevConf

Evolution of ptrace from strace's Perspective

0 rewiews
Explore ptrace API evolution through strace's lens, examining its usage, missing features, and potential kernel improvements for diagnostic utilities.
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1 Lesons
35 minutes
On-Demand
Free-Video
Hussein Nasser

Improving Kafka Performance: Switching from ext4 to XFS for 80% Faster Writes

0 rewiews
Detailed analysis of Kafka performance optimization, exploring file system impact on latency. Covers Kafka internals, tracing, journaled file systems, and the switch from ext4 to XFS for 80% speed improvement.
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9 Lesons
32 minutes
On-Demand
Free-Video
NDC Conferences

Using Seccomp to Limit the Linux Kernel Attack Surface

0 rewiews
Explore seccomp for limiting Linux system calls, enhancing application security. Learn implementation, tools, and considerations for effective use in containers, browsers, and more.
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1 Lesons
1 hour 3 minutes
On-Demand
Free-Video
Linux Plumbers Conference

The UAPI Kernel API Wishlist

0 rewiews
Explore Lennart Poettering's vision for improving the Linux kernel's user-space API, addressing current limitations and proposing enhancements for better system integration.
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1 Lesons
1 hour
On-Demand
Free-Video
CNCF [Cloud Native Computing Foundation]

Seccomp and eBPF: Understanding Container Security and Kernel Access Control

0 rewiews
Explore container security hardening through Seccomp and eBPF, comparing their approaches to limiting Linux kernel access and implementing the principle of least privilege in Kubernetes environments.
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1 Lesons
32 minutes
On-Demand
Free-Video
Dave's Garage

Windows: Under the Covers - From Hello World to Kernel Mode

0 rewiews
Dive into the fascinating journey of how a simple printf() command transforms into pixels on screen, exploring Windows' internal mechanisms and kernel-mode operations.
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1 Lesons
14 minutes
On-Demand
Free-Video
CNCF [Cloud Native Computing Foundation]

eBPF for Creating Least Privileged Policies - Implementing Security Through Kernel Monitoring

0 rewiews
Discover how eBPF enables least privileged policies through kernel code injection, monitoring system calls, and process execution to enhance security against CVEs with minimal application overhead.
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1 Lesons
16 minutes
On-Demand
Free-Video
CNCF [Cloud Native Computing Foundation]

Reinventing Seccomp with eBPF and KRSI for Enhanced Kernel Security

0 rewiews
Explore how eBPF and KRSI can enhance Linux kernel security beyond traditional Seccomp capabilities, with practical demonstrations for implementing advanced syscall filtering in containerized environments.
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1 Lesons
26 minutes
On-Demand
Free-Video
BSidesMunich

/proc for Security Analysts - Unveiling Threats and Forensic Treasures

0 rewiews
Explore Linux's /proc filesystem for security analysis, learning essential techniques for threat detection, process monitoring, and digital forensics in real-world scenarios.
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1 Lesons
29 minutes
On-Demand
Free-Video
USENIX

Practical Data-Only Attack Generation Using Einstein - A Dynamic Taint Analysis Approach

0 rewiews
Discover how Einstein pipeline uses dynamic taint analysis to generate data-only attacks, scan vulnerable system calls, and create exploits that bypass modern security mitigations in server applications.
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1 Lesons
11 minutes
On-Demand
Free-Video
USENIX

Endokernel - A Thread Safe Monitor for Lightweight Subprocess Isolation

0 rewiews
Explore how Endokernel achieves secure subprocess isolation through thread-safe monitoring, efficient memory isolation, and systematic policy enforcement for enhanced application security.
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1 Lesons
10 minutes
On-Demand
Free-Video