embedded linux operating system ppt

... LESSON 9 Linux Operating System Vulnerabilities and security Objectives ♦ Describe the fundamentals of the Linux operating system ♦ Describe the vulnerabilities of the Linux operating system ... operating system ♦ Describe Linux remote attacks ♦ Explain countermeasures for protecting the Linux operating system 2 Review of Linux Security Fundamentals ♦ Linux is a version of UNIX – ... sc/etc/shadow Root:2bcadvr345:0:0:root: /root: /bin/bash - John The Ripper - Viper - Slurple 6 7 Linux File System ♦ Ls –l ♦ -r-x-r-x-wx ♦ Chmod 777 a.txt Firewall: iptables 8 9 10

Ngày tải lên: 29/07/2014, 08:20

... Linux Operating System Trình bày: Bùi Minh Quân Email: bmquan@cit.ctu.edu.vn Nội dung  Tổng quan hệ điều hành Linux  Hệ thống tập tin Linux  Bộ thơng dịch lệnh  ... Linux  Bộ thơng dịch lệnh  Lập trình shell script Các thành phần Linux OS Lý chọn Linux OS (1)  Ứng dụng: nhiều ứng dụng sẵn dùng Linux (miễn phí lẫn thương mại): văn bản, đồ họa, đa phương tiện, ... Lý chọn Linux OS (3)  Tương thích: Hơn 95% mã nguồn viết C, độc lập thiết bị, nên dịch để dùng cho nhiều loại máy khác nhau: Máy chủ, máy để bàn, di dộng,  POSIX (Portable Operating System Interface

Ngày tải lên: 08/05/2021, 13:20

... messages and handle them. For the most part, system messages are handled automatically; for instance, when a B_ZOOM message is received, the operating system zooms the window. But you cannot completely ... Application Server delivers a system message to an application window, that message arrives in the form of a BMessage object. Your code deter- mines how to handle a system message simply by overriding ... Messages When the program refers to a system message by its Be-defined constant, such as B_QUIT_REQUESTED or B_KEY_DOWN, what’s really of interest is the what data member of the system message. The value

Ngày tải lên: 26/01/2014, 07:20

... Time Systems Time Systems 19.2 Silberschatz, Galvin and Gagne ©2005 Operating System Concepts – 7 th Edition, Jan 1, 2005 Chapter 19: Real Chapter 19: Real - - Time Systems Time Systems  System ... Galvin and Gagne ©2005 Operating System Concepts – 7 th Edition, Jan 1, 2005 System System - - on on - - a a - - Chip Chip  Many real-time systems are designed using system- on-a-chip (SOC) ... Galvin and Gagne ©2005 Operating System Concepts – 7 th Edition, Jan 1, 2005 Bus Bus - - Oriented System Oriented System 19.8 Silberschatz, Galvin and Gagne ©2005 Operating System Concepts – 7 th

Ngày tải lên: 28/06/2014, 02:20

... The Linux System Chapter 21: The Linux System 21.2 Silberschatz, Galvin and Gagne ©2005 Operating System Concepts – 7 th Edition, Feb 6, 2005 Chapter 21: The Linux System Chapter 21: The Linux System ... ©2005 Operating System Concepts – 7 th Edition, Feb 6, 2005 The Linux System The Linux System  Linux uses many tools developed as part of Berkeley’s BSD operating system, MIT’s X Window System, ... ©2005 Operating System Concepts – 7 th Edition, Feb 6, 2005 Linux Distributions Linux Distributions  Standard, precompiled sets of packages, or distributions, include the basic Linux system, system

Ngày tải lên: 28/06/2014, 02:20

... Hat® Linux? ? Networking and System Administration Third Edition Terry Collings and Kurt Wall ® ® Red Hat Linux Networking and System Administration Third Edition Red Hat® Linux? ? Networking and System ... at System Boot Shutting Down the System GRUB Configuration File Summary 137 138 139 140 The File System Explained Understanding the File System Structure 141 141 The / Directory Working with Linux- Supported ... File Systems 143 144 ext3 ext2 reiserfs SystemV ufs FAT NTFS IBM JFS SGI XFS Nonstandard Linux File Systems FREEVxFS GFS 145 146 146 147 147 147 147 147 148 148 148 148 Memory and Virtual File Systems

Ngày tải lên: 07/07/2014, 09:20

... at the file system structure are the file system commands, essential to proper file system management In addition to the native Linux file system, Fedora Core and Red Hat Enterprise Linux support ... bring the system down using the shutdown command CHAPTER The File System Explained IN THIS CHAPTER ■ ■ ■ ■ ■ ■ ■ ■ Understanding the File System Structure Working with Linux- Supported File Systems ... shutdown process and reboots the system System Startup and Shutdown GRUB Configuration File When the system boots, GRUB presents a graphical screen showing the operating systems that you can boot The

Ngày tải lên: 07/07/2014, 09:20

... Hat Enterprise Linux systems, the /etc/exports file is the main NFS configuration file It lists the file systems the server exports, the systems permitted to mount the exported file systems, and ... file systems you want to share and several daemons that make these shared file systems visible to and available for use by client systems on the network When an NFS server is sharing a file system ... said to be exporting a file system Similarly, the shared file system is referred to as an NFS export The NFS server daemons provide remote access to the exported file systems, enable file locking

Ngày tải lên: 07/07/2014, 09:20

... Because Linux supports so many file systems, this chapter discusses only a few of the many file systems and file system options. mount’s manual page contains a complete list of the file systems ... mounted file system rw 1 Mounts the file system in read/write mode suid 1 Enables set-UID and set-GID bits on the file system sync 1 Enables synchronous file system I/O on the file system user ... THE SHADOW PASSWORD SYSTEM Red Hat Linux, like most, if not all, Linux and UNIX systems, uses shadow passwords because they offer enhanced protection for your system s authentication

Ngày tải lên: 07/07/2014, 09:20

... Proposition 63 If the device queue is empty and the queue of system processes is not empty, ScheduleNext will select a system process as the next value of currentp Proof This proof is ... devprocqueue denotes the queue of highest-priority processes System processes... processes in the order: 1 device processes; 2 system processes; 3 user processes This corresponds to the ... parent!:APREF (∃ p 1 : APREF • parentof (p 1 , p?) ∧ parent!=p 1 ) Note that the initialisation of the system should include a call to the operation that creates the idle process. The definition of the

Ngày tải lên: 23/07/2014, 23:20

... The UNIX I/O system in BSD Streams An example of streams in System V The UNIX File System (1) Some important directories found in most UNIX systems The UNIX File System (2) • Before ... UNIX File System (1) Disk layout in classical UNIX systems UNIX File System (2) Directory... UNIX File System (2) Directory entry fields Structure of the i-node UNIX File System ... UNIX File System (4) • A BSD directory with three files • The same directory after the file voluminous has been removed The Linux File System Layout of the Linux Ex2 file system ...

Ngày tải lên: 18/10/2014, 15:30

... UNIX File? ?System? ?(4) • A BSD directory with three files • The same directory after the file voluminous  has been removed The? ?Linux? ?File? ?System Layout of the? ?Linux? ?Ex2 file? ?system Network File? ?System? ?(1) ... dirent is a directory entry UNIX File? ?System? ?(1) Disk layout in classical UNIX systems UNIX File? ?System? ?(2) Directory entry fields Structure of the i­node UNIX File? ?System? ?(3)    The relation between the file descriptor table, the  ... (c) A third lock System? ?Calls for File Management • s is an error code • fd is a file descriptor • position is a file offset The lstat? ?System? ?Call Fields returned by the lstat? ?system? ?call System? ?Calls for Directory Management

Ngày tải lên: 30/01/2020, 04:43

... Several years ago Be, Inc set out to develop a new operating system? ??one they eventually dubbed the Media OS The goal was to create an operating system that could keep up with the computationally ... you’ve dealt mostly with system messages—messages generated and dispatched by the system The Message Protocols appendix of the Be Book defines all the system messages In short, system messages fall ... to handle one particular type of system message A system message is the result of an action external to the application The message is generated by the operating system, and is delivered to an

Ngày tải lên: 17/10/2013, 19:15

... Portable Operating System Interface for Unix, is a standard developed so that buyers (particularly the U.S government) could be assured of purchasing programs that ran on a variety of systems ... strict standard so that it is easily ported It’s also designed to run on any POSIX-compliant operating system, which includes most variants of Unix File Organization The BeOS, like the Mac OS, Windows, ... chapter’s examples Using Standard Open and Save Panels 361 Using Standard Open and Save Panels An operating system with a graphical user interface typically provides standardized means for opening and

Ngày tải lên: 20/10/2013, 10:15

... adaptive control method of partially known system and shows its application result to control of a two-wheeled welding mobile robot. The controlled system is designed using Lyapunov stability. ... đIều khiển thích ứng hệ thống xác định một phần Adaptive Control of Partially Known System Nguyễn Tấn Tiến * , Hoàng Đức Liên ** và Kim Sang Bong *** *Khoa Cơ Khí, Đại học Bách khoa ... effectiveness of the proposed controller is shown through simulation results. Keyword: partially known system, Welding Mobile Robot(WMR), tracking, welding path reference 1. Giới thiệu Robot di động

Ngày tải lên: 10/12/2013, 13:16

... BrainBuzz.com TM Cramsession: CompTIA A+ Operating System Technologies What is an OS? Every computer needs an Operating System At the most basic level an Operating System (OS) is the interface between ... CompTIA A+ Operating System Technologies Contents: Contents: What is an OS? Functions Components Command Prompt (DOS) DOS System ... Explorer © 2000 All Rights Reserved – BrainBuzz.com TM Cramsession: CompTIA A+ Operating System Technologies • System Tools and Utilities • Internet Explorer (customize) • HELP Remember: There

Ngày tải lên: 11/12/2013, 15:15

... 6 THE OPERATING SYSTEM MACHINE LEVEL Level Operating system machine level Operating system Level Instruction set architecture level Microprogram ... program Win32 program OS/2 program POSIX subsystem Win32 subsystem OS/2 subsystem User mode System interface System services Executive File cache I/O File systems Virtual memory Processes and threads ... program User mode System call interface File system Process management Block cache IPC Scheduling Device drivers Signals Memory mgmt Hardware Figure 6-30 The structure of a typical UNIX system Kernel

Ngày tải lên: 12/12/2013, 09:15

... riêng cho hệ điều hành nầy gọi Linux native Và partition đăc biệt gọi Linux swap Bạn cài đặt hệ điều hành nầy lên partition Dos hay Windows Chú ý: Trong trình cài đặt Linux, bạn đợc cung cấp chơng ... råi bÊm phÝm Space ®Ĩ trê vỊ hình cài đặt Chú ý: Để cài Linux bạn phải có tối thiểu Partition Linux native đợc đặt tên / (root) partition Linux swap (không cần đặt tên) Fdisk: Tiện ích nầy linh ... dơng Linux, tèt nhÊt lµ chóng ta không cài mạng không nên cài nhiều hệ điều hành với Linux Sau hoàn tất cài đặt, máy tính khởi động lại Logging in: Sau boot lại bạn thấy hiển thị hình: Red Hat Linux

Ngày tải lên: 13/12/2013, 09:16

... the computer carry out the basic operating functions Ex: Operating systems, utilities, and drivers ATHENA Operating System Overview: What is an operating system ? ~ An operating system (OS) is the master controller ... do? Example: ATHENA Personal Computer Operating Systems ~ Windows, Mac OS, Linux, Unix, and DOS ~ What’s the best-selling operating system? ATHENA Personal Computer Operating Systems ~ Microsoft Windows ... AT&T’s Bell Labs ~ Linux was developed in 1991 ~ DOS (Disk Operating System) was developed by Microsoft ATHENA Personal Computer Operating Systems ~ Different operating systems are needed for

Ngày tải lên: 20/01/2014, 22:20

... model: • Define System, System Boundary, System Inputs and Outputs Figure shows the physical model of the physical system, identifying the system and system boundary The input to the system is the ... • Define System, System Boundary, System Inputs and Outputs: A system must be defined before equilibrium and/or compatibility relations can be written Unless physical boundaries of a system are ... control It is evident, therefore, that the measurement subsystem is an important part of a control system The measurement subsystem in a control system contains sensors and transducers that detect

Ngày tải lên: 25/01/2014, 13:20