linux operating system pdf file

... 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

... old -file new -file mv old-name new-name mv file- name dir-name ln -s file- name link-name touch file- name rm [-f] file- name cat file- name nano demo.txt 13 Tài liệu chi tiết  Ngô Bá Hùng - Linux ... 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  ... 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

... typical power systemThe basic structure of a power system is it contains a generating plant, a transmission system, a sub transmission system and a distribution system These subsystems are intercon-nected ... delivery systems Real-time means that power is generated, transported, and supplied the moment you turn on the light switch Electric power systems are not storage systems like water systems and gas systems ... the system. - The running process depends on the environmental impact.On Grid solar system is a solar power system connected to the electricity grid The basic structure of a grid-tied power system

Ngày tải lên: 09/04/2024, 16:08

... data structures In the case of failure, the operating system is guaranteed to find a consistent file system state with contents as of the last CP File systems that support journaling to stable storage ... Techniques for System Analysis In LISA (Oct 2003), pp 73–85 [11] FileBench http://www.solarisinternals.com/ wiki/index.php/FileBench/ [12] H ITZ , D., L AU , J., AND M ALCOLM , M A File system design ... from the rest of the file system Thus, we fully realize the implementation of the back reference system, but embed it in a simulated file system rather than a real file system, allowing us to consider

Ngày tải lên: 19/02/2014, 18:20

... switch accomplished via file system Each file has associated with it a domain bit (setuid bit) When file is executed and setuid = on, then user-id is set to owner of the file being executed When ... protection specifications to generate calls on whatever protection system is provided by the hardware and the operating system Operating System Concepts – 7th Edition, Apr 11, 2005 14.22 Silberschatz, ... Delete, Copy Operating System Concepts – 7th Edition, Apr 11, 2005 14.13 Silberschatz, Galvin and Gagne ©2005 Access Matrix of Figure A With Domains as Objects Figure B Operating System Concepts

Ngày tải lên: 28/06/2014, 02:20

... Gagne ©2005 Operating System Concepts – 7 th Edition, Jan 10, 2005 The Security Problem The Security Problem  Security must consider external environment of the system, and protect the system resources ... and Gagne ©2005 Operating System Concepts – 7 th Edition, Jan 10, 2005 Standard Security Attacks Standard Security Attacks 15.7 Silberschatz, Galvin and Gagne ©2005 Operating System Concepts ... engineering, phishing, dumpster diving z Operating System z Network  Security is as week as the weakest chain 15.8 Silberschatz, Galvin and Gagne ©2005 Operating System Concepts – 7 th Edition, Jan

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

... accounting files quota uses to monitor file system usage There are two such files for each file system on which quotas are used, aquota.user... code repository at ftp://ftp.kernel.org/pub /linux/ ... block? It varies from system to system depending on the size of the underlying disk On this system, a block is 1024K How can you find out the block size of a file system? One cheesy way ... system administration responsibilities is a necessity because the responsibilities... ext2 and ext3 file systems also restrict root’s power, although only slightly The ext2 and ext3 file systems

Ngày tải lên: 07/07/2014, 09:20

... sysfs virtual file system, 155 syslog daemon, 172–174, 482 syslog.conf file, 172–174 syslogd system logger, 733 sysstat package, 822, 826 system activity report tool. See sar tool system administrator. ... system clock. See date and time, system system environmental settings for cron daemon, 171–172 for email aliases, 169 for file system information, 169–170 for GRUB, 139–140, 170–171 for log file ... troubleshooting resource, 879 system logger (syslogd), 733 system requirements, 20–21 system status icon (GNOME), 101 system user, 69 SystemV file system, 147 T talk real-time chat protocol, 435–436

Ngày tải lên: 07/07/2014, 09:20

... [...]... operating systems (for example, [29, 11 , 26] to cite but three from the past twenty years) The classical operating system kernel is to be found in most of the systems today: ... episodes have shown that the operating system is a significant thorn in the side of those desiring secure systems The reliability of the entire operating system, as well as its performance, ... operating systems: RSTS, RSX 11/ M, TOPS10,... sapere aude – Horace, Epistles, I, ii, 40 1. 1 Introduction Operating systems are, arguably, the most critical part of any computer system

Ngày tải lên: 23/07/2014, 23:20

... – when file opened, locate i-node, then find blocks Example File Systems CD-ROM File Systems The ISO 9660 directory entry The CP/M File System (1) Memory layout of CP/M The CP/M File System (2) ... Attributes 11.Rename An Example Program Using File System Calls (1/2) An Example Program Using File System Calls (2/2) File System Reliability (3) • File system states (a) consistent (b) missing block ... Chapter File Systems 6.1 Files 6.2 Directories 6.3 File system implementation 6.4 Example file systems Long-term Information Storage • Must store large

Ngày tải lên: 18/10/2014, 15:30

... UNIX File System (3) • Separate file systems • After mounting... (c) A third lock System Calls for File Management • s is an error code • fd is a file descriptor • position is a file offset ... 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 ... the file descriptor table, the open file description UNIX File System (4) • A BSD directory with three files • The same directory after the file voluminous has been removed The Linux File

Ngày tải lên: 18/10/2014, 15:30

... Chapter 11: File System Implementation Chapter 11: File System Implementation „ File -System Structure „ File -System Implementation „ Directory Implementation ... ©2005 File -System Structure „ File structure z Logical storage unit z Collection of related information „ File system resides on secondary storage (disks) „ File system organized into layers „ File ... illustrates the necessary file system structures provided by the operating systems „ Figure 12-3(a) refers to opening a file „ Figure 12-3(b) refers to reading a file Operating System Concepts – 7th

Ngày tải lên: 04/12/2015, 00:26

... Chapter 11: File -System Interface ■ File Concept ■ Access Methods ■ Directory Structure ■ File System Mounting ■ File Sharing ■ Protection Operating System Concepts 11.1 Silberschatz, ... and Gagne 2002 File System Mounting ■ A file system must be mounted before it can be accessed ■ A unmounted file system (I.e Fig 11-11(b)) is mounted at a mount point Operating System Concepts ... later) Operating System Concepts 11.13 Silberschatz, Galvin and Gagne 2002 Operations Performed on Directory ■ Search for a file ■ Create a file ■ Delete a file ■ List a directory ■ Rename a file

Ngày tải lên: 30/01/2020, 00:49

... when? ?file? ?opened, locate i­node, then find blocks Example? ?File? ?Systems      CD­ROM? ?File? ?Systems The ISO 9660 directory entry The CP/M? ?File? ?System? ?(1) Memory layout of CP/M The CP/M? ?File? ?System? ?(2) ... 10.Set Attributes 11.Rename An Example Program Using? ?File? ?System? ?Calls (1/2) An Example Program Using? ?File? ?System? ?Calls (2/2) File? ?System? ?Reliability (3) • File? ?system? ?states (a) consistent (b) missing block ... Chapter 6 File? ?Systems 6.1 Files  6.2 Directories  6.3? ?File? ?system? ?implementation  6.4 Example? ?file? ?systems  Long­term Information Storage • Must store large amounts of data

Ngày tải lên: 30/01/2020, 01:12

... its client interface Trang 3 Location independence - file name does not need to be Trang 4 Accesses are performed on the cached copy + Files identified with one master copy residing at the ... should be invisible to higher levels + Replicas must be distinguished from one another by Trang 12 system for both servers and clients The client cache is a

Ngày tải lên: 30/01/2020, 01:27

... a file Operating System Concepts 12.5 Silberschatz, Galvin and Gagne 2002 In-Memory File System Structures Operating System Concepts 12.6 Silberschatz, Galvin and Gagne 2002 Virtual File Systems ... Layered File System Operating System Concepts 12.3 Silberschatz, Galvin and Gagne 2002 A Typical File Control Block Operating System Concepts 12.4 Silberschatz, Galvin and Gagne 2002 In-Memory File ... Log-Structured File Systems ■ NFS Operating System Concepts 12.1 Silberschatz, Galvin and Gagne 2002 File -System Structure ■ File structure ✦ Logical storage unit ✦ Collection of related information ■ File

Ngày tải lên: 30/01/2020, 04:36

... 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) • Examples of remote mounted? ?file? ?systems ... 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  open? ?file? ?description UNIX? ?File? ?System? ?(4) ... Steps in executing the command ls type to the shell The UNIX? ?File? ?System? ?(2) • Before linking • After linking (a) Before linking.   (b) After linking The UNIX? ?File? ?System? ?(3) • Separate? ?file? ?systems • After mounting (a) (b)

Ngày tải lên: 30/01/2020, 04:43

... Chapter 12 File Management • Overview • File organisation and Access • File Directories • File Sharing • Record Blocking Files • Files are the central element to most applications – file as an ... locate a selected file? How to enforce user access control in shared systems? Roadmap • Overview • File organisation and Access • File Directories • File Sharing • Record Blocking File Organization ... this system 32 Simultaneous Access • When access is granted to append or update a file to more than one user, the OS or file management system must enforce discipline • User may lock the entire file

Ngày tải lên: 30/01/2020, 05:07

... [...]... scheduling Linux scheduling Operating System Concepts – 7th Edition, Feb 2, 2005 5.33 Silberschatz, Galvin and Gagne ©2005 Solaris 2 Scheduling Operating System Concepts ... Dispatch Table Operating System Concepts – 7th Edition, Feb 2, 2005 5.35 Silberschatz, Galvin and Gagne ©2005 Windows XP Priorities Operating System Concepts –... the system data structures, ... Scheduling  Thread Scheduling  Operating Systems Examples  Java Thread Scheduling  Algorithm Evaluation 5.3 Silberschatz, Galvin and Gagne ©2005 Operating System Concepts – 7 th Edition, Feb

Ngày tải lên: 28/06/2014, 02:20