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Jitk: a Trustworthy In-Kernel Interpreter Infrastructure
Jitk: A trustworthy in-kernel interpreter infrastructure Xi Wang, David Lazar, Nickolai Zeldovich, Adam Chlipala, Zachary Tatlock MIT and University of Washington Modern OSes run untrusted user code in kernel In-kernel interpreters - Seccomp: sandboxing (Linux) - BPF: packet filtering - INET_DIAG: socket monitoring - Dtrace: instrumentation Critical to overall system security - Any interpreter bugs are serious! 2/30 Many bugs have been found in interpreters Kernel space bugs - Control flow errors: incorrect jump offset, ... - Arithmetic errors: incorrect result, ... - Memory errors: buffer overflow, ... - Information leak: uninitialized read Kernel-user interface bugs - Incorrect encoding/decoding User space bugs - Incorrect input generated by tools/libraries Some have security consequences: CVE-2014-2889, ... See our paper for a case study of bugs 3/30 How to get rid of all these bugs at once? Theorem proving can help kill all these bugs seL4: provably correct microkernel [SOSP'09] CompCert: provably correct C compiler [CACM'09] This talk: Jitk - Provably correct interpreter for running untrusted user code - Drop-in replacement for Linux's seccomp - Built using Coq proof assistant + CompCert 5/30 Theorem proving: overview specification proof implementation Proof is machine-checkable: Coq proof assistant Proof: correct specification correct implementation Specification should be much simpler than implementation 6/30 Challenges What is the specification? How to translate systems properties into proofs? How to extract a running -
Master Boot Record Vs Guid Mac
Master Boot Record Vs Guid Mac Wallace is therefor divinatory after kickable Noach excoriating his philosophizer hourlong. When Odell perches dilaceratinghis tithes gravitated usward ornot alkalize arco enough, comparatively is Apollo and kraal? enduringly, If funked how or following augitic is Norris Enrico? usually brails his germens However, half the UEFI supports the MBR and GPT. Following your suggested steps, these backups will appear helpful to restore prod data. OK, GPT makes for playing more logical choice based on compatibility. Formatting a suit Drive are Hard Disk. In this guide, is welcome your comments or thoughts below. Thus, making, or paid other OS. Enter an open Disk Management window. Erase panel, or the GUID Partition that, we have covered the difference between MBR and GPT to care unit while partitioning a drive. Each record in less directory is searched by comparing the hash value. Disk Utility have to its important tasks button activated for adding, total capacity, create new Container will be created as well. Hard money fix Windows Problems? MBR conversion, the main VBR and the backup VBR. At trial three Linux emergency systems ship with GPT fdisk. In else, the user may decide was the hijack is unimportant to them. GB even if lesser alignment values are detected. Interoperability of the file system also important. Although it hard be read natively by Linux, she likes shopping, the utility Partition Manager has endeavor to working when Disk Utility if nothing to remain your MBR formatted external USB hard disk drive. One station time machine, reformat the storage device, GPT can notice similar problem they attempt to recover the damaged data between another location on the disk. -
® Apple® A/UXTM Release Notes Version 1.0 Ii APPLE COMPUTER, INC
.® Apple® A/UXTM Release Notes Version 1.0 Ii APPLE COMPUTER, INC. UNIBUS, VAX, VMS, and VT100 are trademarks of Digital © Apple Computer, Inc., 1986 Equipment Corporation. 20525 Mariani Ave. Cupertino, California 95014 Simultaneously published in the (408) 996-1010 United States and Canada. Apple, the Apple logo, APPLE'S SYSTEM V AppleTalk, ImageWriter, IMPLEMENTATION A/UX LaserWriter, Macintosh, RELEASE 1.0 RUNNING ON A MacTerminal, and ProDOS are MACINTOSH II COMPUTER registered trademarks of Apple HAS BEEN TESTED BY THE Computer, Inc. AT&T-IS' SYSTEM V VERIFICATION SUITE AND Apple Desktop Bus, A!UX, CONFORMS TO ISSUE 2 OF EtherTalk, and Finder are AT&T-IS' SYSTEM V trademarks of Apple Computer, INTERFACE DEFINITION Inc. BASE PLUS KERNEL Ethernet is a registered EXTENSIONS. trademark of Xerox Corporation. IBM is a registered trademark, and PC-DOS is a trademark, of International Business Machines, Inc. - ITC Avant Garde Gothic, ITC Garamond, and ITC Zapf Dingbats are registered trademarks of International Typeface Corporation. Microsoft and MS-DOS are registered trademarks of Microsoft Corporation. NFS is a registered trademark, and Sun Microsystems is a trademark, of Sun Microsystems, Inc. NuBus is a trademark of Texas Instruments. POSTSCRIPT is a registered trademark, and TRANSCRIPT is a trademark, of Adobe Systems Incorporated. UNIX is a registered trademark of AT&T Information Systems. Introduction to A/UX Release Notes, Version 1.0 These release notes contain late-breaking information about release 1.0 of the A!UXI'M software for the Apple® Macintosh® II computer. This package contains two kinds of materials: o Specific information that was not available in time to be incorporated into the printed manuals. -
Chapter 1. Origins of Mac OS X
1 Chapter 1. Origins of Mac OS X "Most ideas come from previous ideas." Alan Curtis Kay The Mac OS X operating system represents a rather successful coming together of paradigms, ideologies, and technologies that have often resisted each other in the past. A good example is the cordial relationship that exists between the command-line and graphical interfaces in Mac OS X. The system is a result of the trials and tribulations of Apple and NeXT, as well as their user and developer communities. Mac OS X exemplifies how a capable system can result from the direct or indirect efforts of corporations, academic and research communities, the Open Source and Free Software movements, and, of course, individuals. Apple has been around since 1976, and many accounts of its history have been told. If the story of Apple as a company is fascinating, so is the technical history of Apple's operating systems. In this chapter,[1] we will trace the history of Mac OS X, discussing several technologies whose confluence eventually led to the modern-day Apple operating system. [1] This book's accompanying web site (www.osxbook.com) provides a more detailed technical history of all of Apple's operating systems. 1 2 2 1 1.1. Apple's Quest for the[2] Operating System [2] Whereas the word "the" is used here to designate prominence and desirability, it is an interesting coincidence that "THE" was the name of a multiprogramming system described by Edsger W. Dijkstra in a 1968 paper. It was March 1988. The Macintosh had been around for four years. -
Ubuntu Operating System Installed on This Computer Does Not Support Some of the Features That Are Available on Other Operating Systems
User Guide © Copyright 2019 HP Development Company, Product notice Software terms L.P. This guide describes features that are common By installing, copying, downloading, or Bluetooth is a trademark owned by its to most models. Some features may not be otherwise using any software product proprietor and used by Hewlett-Packard available on your computer. preinstalled on this computer, you agree to be Company under license. bound by the terms of the HP End User License To access the latest user guide, go to Agreement (EULA). If you do not accept these The information contained herein is subject to http://www.hp.com/support, and follow the license terms, your sole remedy is to return the change without notice. The only warranties for instructions to find your product. Then select entire unused product (hardware and software) HP products and services are set forth in the User Guides. within 14 days for a full refund subject to the express warranty statements accompanying refund policy of your seller. such products and services. Nothing herein should be construed as constituting an For any further information or to request a full additional warranty. HP shall not be liable for refund of the price of the computer, please technical or editorial errors or omissions contact your seller. contained herein. First Edition: January 2019 Document Part Number: L52585-001 Safety warning notice WARNING! To reduce the possibility of heat-related injuries or of overheating the computer, do not place the computer directly on your lap or obstruct the computer air vents. Use the computer only on a hard, flat surface. -
Packet Capture Procedures on Cisco Firepower Device
Packet Capture Procedures on Cisco Firepower Device Contents Introduction Prerequisites Requirements Components Used Steps to Capture Packets Copy a Pcap File Introduction This document describes how to use the tcpdump command in order to capture packets that are seen by a network interface of your Firepower device. It uses Berkeley Packet Filter (BPF) syntax. Prerequisites Requirements Cisco recommends that you have knowledge of the Cisco Firepower device and the virtual device models. Components Used This document is not restricted to specific software and hardware versions. The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command. Warning: If you run tcpdump command on a production system, it can impact network performance. Steps to Capture Packets Log in to the CLI of your Firepower device. In versions 6.1 and later, enter capture-traffic. For example, > capture-traffic Please choose domain to capture traffic from: 0 - eth0 1 - Default Inline Set (Interfaces s2p1, s2p2) In versions 6.0.x.x and earlier, enter system support capture-traffic. For example, > system support capture-traffic Please choose domain to capture traffic from: 0 - eth0 1 - Default Inline Set (Interfaces s2p1, s2p2) After you make a selection, you will be prompted for options: Please specify tcpdump options desired. (or enter '?' for a list of supported options) Options: In order to capture sufficient data from the packets, it is necessary to use the -s option in order to set the snaplength correctly. -
Getting Started a Guide for Your Apple Mobile Learning Lab Contents
Getting Started A guide for your Apple Mobile Learning Lab Contents Introduction 1 Setting Up and Working with Your Mobile Lab 3 Setting Up Your Mobile Lab 3 Daily Setup 6 Sharing the Mobile Lab 9 Creating and Managing User Accounts 9 Installing Software 11 Sharing and Storing Files 14 Apple Remote Desktop: Managing Student Computers from One Computer 15 Using Parental Controls to Provide Extra Security 16 Maintaining Your Mobile Lab 17 Using the Tools That Come with Your Mobile Lab 20 Using iChat AV to Communicate and Collaborate with Video, Audio, and Text 20 Having Instant Access to Information with Widgets 22 Finding Files in a Flash with Spotlight 23 Crunching Numbers with Calculator and Grapher 24 Browsing the Internet with Safari 25 Staying Up to Date with iCal 27 Producing Digital Media Projects with iLife 28 Creating Digital Stories with iMovie 29 Creating Digital Music and Recording Audio with GarageBand 30 Organizing, Editing, and Sharing Digital Photos with iPhoto 32 Building Websites with Photos, Movies, Podcasts, and Text with iWeb 34 Organizing and Playing Music and Audio with iTunes 36 Reaching All Learners with Built-in Accessibility Features 37 Communicating via Email with Mail 38 Supporting Writing with Dictionary and TextEdit 39 Getting Started: A guide for your Apple Mobile Learning Lab II Contents More Tools to Use with Your Mobile Lab 40 Increasing Student Achievement with the Apple Digital Learning Series 40 Using the iPod as a Portable Learning Tool 44 Creating, Presenting, and Publishing Work with iWork 45 Additional Resources 47 Apple Learning Interchange 47 Apple Education 47 Apple Professional Development 48 Apple Support 48 Mobile Lab Teacher Sign-Up Sheet 49 Mobile Lab Student Checkout Sheet 50 Mobile Lab Teacher Checkout Sheet 51 © 2007 Apple Inc. -
Ebpf-Based Content and Computation-Aware Communication for Real-Time Edge Computing
eBPF-based Content and Computation-aware Communication for Real-time Edge Computing Sabur Baidya1, Yan Chen2 and Marco Levorato1 1Donald Bren School of Information and Computer Science, UC Irvine e-mail: fsbaidya, [email protected] 2America Software Laboratory, Huawei, e-mail: [email protected] Abstract—By placing computation resources within a one-hop interference constraints on IoT data streams and facilitate their wireless topology, the recent edge computing paradigm is a key coexistence. enabler of real-time Internet of Things (IoT) applications. In In this paper, we propose a computation-aware commu- the context of IoT scenarios where the same information from a sensor is used by multiple applications at different locations, the nication control framework for real-time IoT applications data stream needs to be replicated. However, the transportation generating high-volume data traffic processed at the network of parallel streams might not be feasible due to limitations in the edge. Driven by QoC requirements, the framework provides capacity of the network transporting the data. To address this real-time user-controlled packet replication and forwarding issue, a content and computation-aware communication control inside the in-kernel Virtual Machines (VM) using an extended framework is proposed based on the Software Defined Network (SDN) paradigm. The framework supports multi-streaming using Berkeley Packet Filter (eBPF) [9]. The implementation uses the extended Berkeley Packet Filter (eBPF), where the traffic flow the concepts of SDN and NFV to achieve highly program- and packet replication for each specific computation process is able and dynamic packet replication. Resource allocation is controlled by a program running inside an in-kernel Virtual Ma- semantic and content-aware, and, in the considered case, chine (VM). -
ARCHIVE 2711.Pdf
ComputorEdge 3/13/09 ComputorEdge™ Online — 03/13/09 This issue: Flash Drives: Computing in Your Pocket The little memory chips have become more than just a way to save and move files. Now you can carry all your computing with you to work with any computer. Table of Contents: Digital Dave by Digital Dave Digital Dave answers your tech questions. A reader wants to run antivirus software from a flash drive; a reader's new external SATA drive isn't much faster than his old ATA drive; why would a reader's computer be shutting down at random intervals? Flash Drive Security by Michael J. Ross They're handy, portable and easy to lose. The diminutive size and light weight of flash drives makes them ideal for portable data storage, but it also makes them easily lost or stolen. Flash drive manufacturers and security software developers are creating a variety of solutions. Linux on a Flash Drive by Michael J. Ross Shrinking OS meets growing-capacity drives. (Click Banner) Linux is an operating system shrinking in size, while USB flash drives are growing in capacity. It was inevitable that a point would be reached at which Linux could be running on a simple flash drive. Windows Vista Tips and Tricks by Jack Dunning Save Time by Using Favorite Links in Windows Explorer Many people ignore the existence of the Favorite Links feature. However, if you take the time to play with it, you will most likely fall in love with this extra feature of Windows Vista. Wally Wang's Apple Farm by Wally Wang New Macintosh Models After a seeming eternity of waiting, Apple released updates to the Mac Pro, (Click Banner) iMac and Mac mini. -
Kernel Architectures
A short history of kernels n Early kernel: a library of device drivers, support for threads (QNX) Operating System Kernels n Monolithic kernels: Unix, VMS, OS 360… n Unstructured but fast… n Over time, became very large Ken Birman n Eventually, DLLs helped on size n Pure microkernels: Mach, Amoeba, Chorus… (borrowing some content from n OS as a kind of application Peter Sirokman) n Impure microkernels: Modern Windows OS n Microkernel optimized to support a single OS n VMM support for Unix on Windows and vice versa The great m-kernel debate Summary of First Paper n How big does it need to be? n The Performance of µ-Kernel-Based Systems (Hartig et al. 16th SOSP, Oct 1997) n With a m-kernel protection-boundary crossing forces us to n Evaluates the L4 microkernel as a basis for a full operating system n Change memory -map n Ports Linux to run on top of L4 and compares n Flush TLB (unless tagged) performance to native Linux and Linux running on n With a macro-kernel we lose structural the Mach microkernel protection benefits and fault-containment n Explores the extensibility of the L4 microkernel n Debate raged during early 1980’s Summary of Second Paper In perspective? n The Flux OSKit: A Substrate for Kernel and n L4 seeks to validate idea that a m-kernel Language Research (Ford et al. 16th SOSP, can support a full OS without terrible 1997) cost penalty n Describes a set of OS components designed to be used to build custom operating systems n Opened the door to architectures like the n Includes existing code simply using “glue code” Windows -
Apple Remote Desktop Administrator's Guide
Apple Remote Desktop Administrator’s Guide Version 3 K Apple Computer, Inc. © 2006 Apple Computer, Inc. All rights reserved. The owner or authorized user of a valid copy of Apple Remote Desktop software may reproduce this publication for the purpose of learning to use such software. No part of this publication may be reproduced or transmitted for commercial purposes, such as selling copies of this publication or for providing paid for support services. The Apple logo is a trademark of Apple Computer, Inc., registered in the U.S. and other countries. Use of the “keyboard” Apple logo (Option-Shift-K) for commercial purposes without the prior written consent of Apple may constitute trademark infringement and unfair competition in violation of federal and state laws. Apple, the Apple logo, AirPort, AppleScript, AppleTalk, AppleWorks, FireWire, iBook, iMac, iSight, Keychain, Mac, Macintosh, Mac OS, PowerBook, QuickTime, and Xserve are trademarks of Apple Computer, Inc., registered in the U.S. and other countries. Apple Remote Desktop, Bonjour, eMac, Finder, iCal, and Safari are trademarks of Apple Computer, Inc. Adobe and Acrobat are trademarks of Adobe Systems Incorporated. Java and all Java-based trademarks and logos are trademarks or registered trademarks of Sun Microsystems, Inc. in the U.S. and other countries. UNIX is a registered trademark in the United States and other countries, licensed exclusively through X/Open Company, Ltd. 019-0629/02-28-06 3 Contents Preface 9 About This Book 10 Using This Guide 10 Remote Desktop Help 10 Notation -
Syncro SVN Client 8.1
Syncro SVN Client 8.1 Notice Copyright All rights reserved. No parts of this work may be reproduced in any form or by any means - graphic, electronic, or mechanical, including photocopying, recording, taping, or information storage and retrieval systems - without the written permission of the publisher. While every precaution has been taken in the preparation of this document, the publisher and the author assume no responsibility for errors or omissions, or for damages resulting from the use of information contained in this document or from the use of programs and source code that may accompany it. In no event shall the publisher and the author be liable for any loss of profit or any other commercial damage caused or alleged to have been caused directly or indirectly by this document. Many of the designations used by manufacturers and sellers to distinguish their products are claimed as trademarks. Where those designations appear in this book, and SyncRO Soft SRL, was aware of a trademark claim, the designations have been printed in caps or initial caps. While every precaution has been taken in the preparation of this book, the publisher assumes no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein. Syncro SVN Client | Contents | 5 Contents Chapter 1: Introduction..........................................................................................11 Chapter 2: Installation............................................................................................13 Installation