In nearly a decade of our involvement in cloud-native network development, we have deeply realized that troubleshooting network issues, even in small environments, can turn into a nightmare. Much of the complexity arises from the Linux kernel itself—sending a single packet can involve dozens of kernel functions from different subsystems. Traditional tools like tcpdump often … Read more
Source: Reprinted with permission from OSC Open Source Community (ID: oschina2013) Recently, Tencent engineer Kairui Song submitted a new patch to the Linux kernel mailing list, proposing the introduction of a new architecture called Swap Table, which integrates swap cache, swap mapping, and swap allocator into a new backend infrastructure. According to reports, the latest … Read more
Vulnerability Description: In the XFRM interface, the collect_md attribute can only be set during device creation. Therefore, if change_link() is called on an interface of type collect_md, it should directly return a failure. However, the check that was originally intended to enforce this restriction is only performed when locate() returns xi, but locate() itself does … Read more
Public Account “Focus on Linux”, dedicated to Linux kernel development The Linux102 series will detail 102 files in version 0.11 of Linux. This article discusses the source code of the 45th file, <span>【Linux102】45-kernel/blk_drv/ramdisk.c</span>. 1. Main Function of ramdisk.c This is a memory virtual disk driver, written by Theodore Ts’o. It means that: If RAMDISK is … Read more
This article mainly introduces personal experiences in the community and some interesting anecdotes observed from subscription emails. # Krzysztof Wilczyński I have also been deeply affected by this maintainer, not just me, but also my colleagues in the company, and over 100 to 500 people in the community who have experienced patches being commented on … Read more
Recently, I’ve seen many friends asking, “I want to learn operating system development, but it’s so hard to get started!” Don’t worry, today I want to recommend a fantastic project—Raspberry Pi OS. It allows you to deeply understand the Linux kernel while getting hands-on experience with a “Hello, world!” on the Raspberry Pi. Let’s discuss … Read more
1. The Essence and Core Value of Comments Comments are non-executable text in source code meant for human reading, and their core value lies in enhancing code maintainability. In Linux kernel development, the principle of “comments should explain why, not how” is followed. For example, in the memory management module, developers might comment, “Using a … Read more
Kprobe is a powerful debugging and tracing tool in the Linux kernel that allows developers to dynamically insert breakpoints at almost any instruction in the kernel, enabling the collection of debugging and performance information without the need to reboot the system, modify the kernel source code, or recompile the kernel. In the previous article, Introduction … Read more
More content can be added to the Linux system knowledge base package (tutorials + videos + Q&A). Back to school season “Linux Driver Comprehensive Course” promotion. Table of Contents 1. Linux Kernel Boot Process Flowchart 2. Self-Extraction Phase 3. Kernel Entry Point 4. Assembly Phase 5. C Function Phase 6. Kernel Boot Scene 7. Executing … Read more
1. Introduction: Why is ELF Signature Verification Needed? In Linux systems, ELF (Executable and Linkable Format) is the core format for executable files and shared libraries. By default, the kernel only checks the format validity of ELF files (such as magic number and architecture matching), without verifying the integrity and legitimacy of the file’s source— … Read more
