Introducing the system call process under Linux
Process: First look at a picture to get a general understanding. First of all, what the application can directly call is the API provided by the system, which can be done in user mode (Ring3). Then the corresponding API will save the corresponding system call number into the eax register (this step is implemented through inline assembly), and then use int0x80 to trigger the interrupt (inline assembly) and enter the interrupt processing function (this function is completely Written in assembly code), this time it enters the kernel state (Ring0). The system call corresponding to the system call number will be called in the interrupt handling function. In this function, the two registers ds and es will be set to point to the kernel space. In this way, we cannot get the data from user mode
Apr 11, 2024 am 09:43 AM
DHCP principles in Linux
DHCP Principle DHCP Lease Four Steps A: Client Makes IP Request When a DHCP client starts, it will automatically configure its IP address to 0.0.0.0. Since normal communication cannot be carried out using 0.0.0.0, the client must pass DHCP server to obtain a legal address. Since the client does not know the IP address of the DHCP server, it uses the address of 0.0.0.0 as the source address, UDP68 port as the source port, 255.255.255.255 as the destination address, and UDP67 port as the destination port to broadcast the requested IP address information. . The broadcast information contains the MAC address and computer name of the DHCP client so that DHCP
Apr 10, 2024 pm 09:04 PM
How to configure wordpress in centos7 based on lnmp
1. Download and install WordPresswgethttp://wordpress.org/latest.zip#Download the WordPress installation file unziplatest.zip#Unzip the installation file. Since my host is equipped with discuz, there will be some problems. First, delete all discuz files and study the back of WordPress. Then study the coexistence of two things rm-rfvar/www/html#Delete mkdir-p/var/www/html#Create the website root directory cp-rfwordpress/*/var/www/html/#Copy the installation file to the website root directory chmod-R777/va
Apr 10, 2024 pm 05:28 PM
Specific method to install vsftpd on Centos7
1. Install vsftpdyuminstall-yvsftpd through yum 2. Modify the vsftpd configuration file vi/etc/vsftpd/vsftpd.conf. Modify the configuration file as follows: 1. Do not allow anonymous access anonymous_enable=NO2. Allow the use of local accounts for FTP user login verification local_enable= YES3. Prevent users from leaving the home directory. When chroot_list_enable=YES and chroot_local_user=YES, users listed in the /etc/vsftpd.chroot_list file can switch to other directories; not
Apr 10, 2024 am 09:07 AM
How to install multiple Python versions under Linux
Download the Python source code. Download the source files from http://www.python.org/download/. Compile and install tarzxvfPython-2.7.6.tgzcdPython-2.7.6./configure--prefix=/usr/local/python-2.7.6#Important, specify the installation path of python, you can set it yourself. makesudomakeinstall modifies the Python soft link. The default python command is in the /usr/bin/ directory. You need to modify the soft link here to version 2.7 and create a 2.4 soft link by the way. mv/usr/b
Apr 09, 2024 pm 06:07 PM
Linux 64-bit operating system: doubled performance, soaring memory, worry-free security
1. Introduction to Linux 64-bit operating system Linux 64-bit operating system is built based on advanced Linux kernel technology and integrates high performance, memory advantages and security features. After continuous innovation in computer hardware technology, 64-bit operating systems have increasingly become the preferred mainstream solution, widely penetrating into many industries such as personal computers, servers, and embedded devices. In the field of Linux, 64-bit operating systems are gradually phasing out 32-bit operating systems and becoming the favored choice of users and developers. Thanks to its superior performance and stable performance, it has been distributed in Linux training schools in many industries, helping users obtain a high-quality experience and improve production efficiency. 2.Linux64-bit operating system architecture The Linux64-bit operating system adopts x86-6
Apr 09, 2024 am 09:07 AM
Summary of ultra-complete penetration testing commands for Linux hosts
The following is a penetration testing memo for a Linux machine. They are some typical commands during later development or when performing command injection and other operations. They are designed for testers to perform local enumeration checks. In addition, you can read many articles about penetration testing here. The system information command is useful for local enumeration checks. Redhat/CentOS/RPM-based distribution YUM commands RPM-based systems use a package manager. You can use these commands to get useful information about installed packages or other tools. Debian/Ubuntu/.deb-based distribution Linux user management Linux decompression command How to parse different compressed packages (tar,z) on Linux
Apr 09, 2024 am 09:07 AM
Several precautions for Oracle installation system swap drive! !
The steps to install Oracle under Linux explain the required software environment: linuxAS3U2, ORACLE9.2.0.4, and upgrade package. The hardware environment requires at least 512M of video memory, a large enough swap space of at least 400M, and an installation space of at least 800M. If you need a CD to install, you also need a floppy drive. 1. Preparation work ① Before installing Oracle, it is best to have a clean Linux environment, set up the swap space, and do not install a firewall later (install it if necessary after installing the database). ②. Create a folder containing the Oracle installation files in the usr directory under Linux and name it ora9i, and then copy the installation files to
Apr 09, 2024 am 08:30 AM
The secret of Linux user disk quota: Preventing from occupying the mountain to ensure the stability of the system
Understand Linux user disk quotas. In the Linux operating system environment, disk quotas are particularly critical as a management strategy, which helps to strengthen the management of users' hard disk storage permissions. Using quota settings, we can reasonably allocate the disk capacity range available to each user or user group to prevent a very small number of users from excessively occupying space and negatively affecting other users. Next, Linux user disk quota. This article mainly explains the implementation plan of Linux user disk quota. Linux view port occupancy covers all aspects of quota setting, maintenance and monitoring. It also prepares some problems that may be encountered in practice. Challenges and solutions. Why do you need to set disk quotas? Setting disk quotas can prevent a certain user or intruder from entering.
Apr 08, 2024 am 09:01 AM
Introduction to the setting tutorial on how to switch to dual-screen display in the Ningsi Panshi system
Dual-screen display is becoming more and more common in modern notebook operations, especially when multiple tasks need to be processed at the same time at work. Dual-screen display can improve work efficiency and reduce the complexity of operations. In the LinlinLinux system, dual-screen display settings are also very easy to implement. This article will introduce to you how to switch to dual screens in the Linlin Linux system to see what Linux system is, as well as a tutorial on setting up dual-screen displays. 1. Connect the dual-screen monitor First, we need to connect the laptop to the dual-screen monitor. For computer notebooks, there is usually an HDMI socket or a VG socket. We can connect a dual-screen monitor to the notebook through this socket. For desktop notebooks, usually
Apr 08, 2024 am 08:16 AM
Decrypting Linux Installation Scripts: The Secrets Behind the Amazing Technique
As an engineer who is passionate about technology, I am extremely interested in Linux installation scripts. Linux is popular for its open code and high degree of customization, and installation scripts are an important facility in setting up and configuring Linux systems. In the following chapters, I will elaborate on the principles, construction methods, common difficulties and best practices of Linux scheduled shutdown commands of Linux installation scripts, in order to lead you to deeply explore the inner mysteries of this magical technology. 1.Linux installation script overview
Apr 08, 2024 am 08:10 AM
A useful LaTeX editor on the Linux platform
Summary: Once you get over the learning curve of LaTeX, there's nothing like LaTeX. Introduced below are the best LaTeX editors for Linux and other platforms. What is LaTeX? LaTeX[1] is a document production system. Unlike a plain text editor, in a LaTeX editor you can't just write plain text, you also have to use some LaTeX commands in order to organize the content of the document. LaTeX Example LaTeX editor is generally used for publishing scientific research documents or books for academic purposes. Most importantly, it can bring you convenience when you need to process documents containing many complex mathematical symbols. Sure, using a LaTeX editor is fun, but it's not always
Apr 07, 2024 pm 05:13 PM
Ningsi linux secure operating system installation tutorial operation manual
Part 1 Installation of Thinking Linux Operating System Chapter 1 Overview This guide is applicable to Thinking Rock Security Operating System V4.2. Chapter 2 Installation This chapter will guide users to install the Thinking Rock security operating system. 2.1 Start the installation program and set the CD as the first boot disk in the BIOS. Insert the SiPanShi Security Operating System V4.2 installation CD into the hard disk and restart. You will hear the installation CD prompt interface as shown in Figure 2.1. Figure 2.1: Press the Enter key on the installation CD prompt interface and wait for the CD to boot the system until the login: prompt appears, as shown in Figure 2.2. If no operations are performed, the disc will wait for 10 seconds before manually booting the system. Figure 2.2: Enter the username: root and password on the CD-ROM login interface
Apr 07, 2024 am 09:13 AM
Essential skills for Linux system management! Easy to master Vim editor installation tutorial
As a professional who is familiar with Linux system management, mastering the use of Vim for text editing is one of the necessary skills. Vim is a text editing tool that is widely run on Linux systems and has efficient, flexible and powerful features. Here, we explain in detail the installation tutorial of Vim editor in Linux environment. Install vim on Linux operating system, covering important information such as the preparation steps required for installation, installation methods of different versions, and recommended backup plug-ins. 1. Preparation work To ensure the smooth installation and necessary configuration of the Vim editor, please follow the steps below to perform preliminary preparations. First, you need to log in to the Linux environment as the root user; second, please check and upgrade the system's software package inventory before installation so that
Apr 07, 2024 am 09:01 AM
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