Anatomy of the Linux kernel Given that the goal of this article is to introduce you to the Linux kernel and explore its architecture and major components, let's start with a short tour of Linux kernel history, then look at the Linux kernel architecture from 30,000 feet, and, finally, examine its major subsystems. The Linux kernel is over six million lines of code, so this introduction is not exhaustive. Use the pointers to more content to dig in further. A short tour of Linux history
50 best Photoshop tutorials - Features Learn techniques for Photoshop across art, illustration, graphics and photography in these tutorials from the world's best practitioners. Photoshop is a very versatile software tool, as flexible for seamlessly compositing disparate elements into a beautiful photomotage as it is making your photos look even more stunning. It also provides an effortless platform for creating dynamic graphics for both web and print - and let's not forget its pragmatic usefulness as a day-to-day tool for tranforming graphics and photos into the perfect format for your output requirements.
System Call Handler System Call Handler It is not possible for user-space applications to execute kernel code directly. They cannot simply make a function call to a method existing in kernel-space because the kernel exists in a protected memory space. If applications could directly read and write to the kernel's address space, system security and stability would go out the window. Instead, user-space applications must somehow signal the kernel that they want to execute a system call and have the system switch to kernel mode, where the system call can be executed in kernel-space by the kernel on behalf of the application. The mechanism to signal the kernel is a software interrupt: Incur an exception and then the system will switch to kernel mode and execute the exception handler.
Gaming Tweaks Tweaks to optimize Windows for low latency online gaming2014-04-01 (updated: 2015-08-30) by PhilipTags: gaming, mmo, tweaks Online Gaming can often benefit from some fine-tuning of Windows TCP/IP settings and the Network Adapter properties. This article is intended to supplement our general broadband tweaks and list only TCP/IP settings that are specific to online gaming and reducing network latency. Some of these settings are also mentioned in our general tweaking articles, however, the emphasis here is on latency rather than throughput, and we have complemented the tweaks with more gaming-specific recommendations and settings that give priority to multimedia/gaming traffic, and may be outside of the scope of other broadband tweaks that focus on pure throughput. Some proficiency in using Command Prompt/PowerShell and editing the Windows Registry is expected. The Windows Registry can be accessed from the Start/Windows button -> type: regedit.
Version 6 Release of the REMnux Linux Distro for Malware Analysis I’m excited to announce the v6 release of the REMnux distro, which helps analysts examine malware using free utilities in a Linux environment. REMnux v6 updates the tools that were present in the earlier revisions of the distro and introduces several new ones. Moreover, it implements major architectural changes behind the scenes to allow REMnux users to easily apply future updates without having to download the full REMnux environment from scratch. Get REMnux v6
index Welcome to the DARPA Open Catalog, which contains a curated list of DARPA-sponsored software and peer-reviewed publications. DARPA sponsors fundamental and applied research in a variety of areas including data science, cyber, anomaly detection, etc., which may lead to experimental results and reusable technology designed to benefit multiple government domains. The DARPA Open Catalog organizes publicly releasable material from DARPA programs. 45 Amazing and Free Photoshop Actions This post was originally published a few years ago, and many of the actions originally featured are no longer available. The post has been edited to remove the dead links and to improve the quality of the actions featured. Some of the actions originally included still remain, but you’ll now find a better selection and better quality. Photoshop actions allow designers and photographers to automate common sequences for increased efficiency. If you do much work with photo editing you can certainly benefit from the time saved by having a good library of Photoshop actions.
LINUX KERNEL INTERNALS: Kernel Space and User Space Understanding of Kernel space and User space in detail is very important if you wish to have a strong base of Linux Kernel.Here Kernel Space and User Space corresponds to their Virtual address space.Every process in linux utilizes its own separate virtual space.In a linux system based on 32 bit Architecture, user space address space corresponds to lower 3GB of virtual space and kernel space the upper 1GB.(general way)The kernel space virtual address space is shared between all the processes.When a process is active, it can either be running in "user mode" or "kernel mode".In a process is running in User mode it means that the CPU is running the user space side of code.A process running in the user mode has limited capability and is controlled by a flag in the CPU.Even though the kernel memory is present in the process's memory map the user space code is not allowed to access the kernel space code. 2.
Turn Off Unnecessary Windows Services Windows is notorious for having useless features and CPU resource hogging programs/services enabled by default. Today’s post is about removing some of the useless services. Services are kind of like startup programs, they are usually not necessary, they slow down your computer, and they slow down the boot up process; however, some are useful so thats why I have made a list of ones to get rid of.0 To turn off services in windows you go to Start > Run > Type: ‘services.msc’ > Double Click on the service you want to alter and change the startup type to disabled or manual as directed in the list of unnecessary services below. AdobeLM Service: Not all computers have this service, still it is useless, just disable it if you have it.
Reverse Engineering With Radare2, Part 1 A couple of weeks back, the folks at RPISEC posted the lecture slides and lab contents of their Modern Binary Exploitation course, held earlier this year. The course is designed to take somebody with basic C skills and have them work their way through a series of reverse engineering challenges of increasing difficulty. This seemed like a great opportunity to fire up Radare2 and put it to work. This series of posts will work through each of the lecture challenges and labs, with a focus on solving them using Radare2 (and a little help from gdb and friends along the way). I believe that reverse engineering is a fantastic skill for software developers to pick up. The idea may carry connotations of software piracy with it, but it’s tremendously useful for debugging software and learning how compilers work.
Linux powers 91% of the worlds top supercomputers With the biannual list of the top 500 supercomputers the world over released, the following screenshot of a graph showing the operating systems used in those 500 peta-flop crunching machines, and produced by the University of California Berkeley, makes for an impressive visual glance at Linux’s dominance in Super Computing. Check it out in its full interactive form @ to get down and dirty with the stats behind it. How You Can Use Microsoft OneNote for Project Management OneNote is more than a note taking program. It’s the ideal collaboration tool for managing simple projects in small teams. And unlike Evernote, OneNote is completely free. We’ll show you how you can use OneNote for project management, either by yourself or with your team, and we’ll demonstrate basic and advanced OneNote features along the way. 1.
System Call Implementation System Call Implementation The actual implementation of a system call in Linux does not need to concern itself with the behavior of the system call handler. Thus, adding a new system call to Linux is relatively easy.