Compile build debug the Linux kernel networking code system environment MenuOS

Compile build debug the Linux kernel networking code system environment MenuOS

The operation command given reference, divided into the following steps:

1. Installation compile the kernel depends

   sudo apt install build-essential flex bison libssl-dev libelf-dev libncurses-dev

   The installation process may experience slow download speeds and lead to failure, the software can be replaced from another source or network. . .
2. Download and compile the kernel

   • Download the kernel

     wget https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.0.1.tar.xz
     xD -d Linux-5.0.1.tar.xz
     the tar -xvf 5.0.1-Linux .tar # unzip the downloaded zip file
     cd linux-5.0.1 # unzip into the folder, ready to compile the kernel

   Here had a little problem, that is the official website download speed is too slow .... suggestions directly to the official website, copy the link to the right address, and then use Thunder download, pro-test download speeds up to 6M / s
   

   • Compile the kernel

     make i386_defconfig # accordance with the default kernel configuration file to generate
     the make menuconfig
     the make or make -j #j as the number of CPU cores
     

After entering these two commands will enter a visual interface for configuring the kernel, as follows:
(1) Enter Select Kernel hacking
(2) Select Compile-time checks and compiler options carriage
(3) Select Compile the kernel with debug info press the spacebar, and then save directly to the default cursor left to save the last exit

1. Production root file virtual machine

   • Install qemu

     sudo apt install qemu
     qemu-system-i386 -kernel linux-5.0.1/arch/x86/boot/bzImage #qemu加载linux内核

   • 构建MenuOS

     git clone https://github.com/mengning/menu.git
     sudo apt-get install libc6-dev-i386 #安装libc6-dev-i386
     qemu -kernel linux-5.0.1/arch/x86/boot/bzImage -initrd rootfs.img #创建系统镜像 (linux-5.0.1目录下)
     make rootfs #初始化(menu目录下)
     

2. 构建gdb调试环境

   • 在qemu中启动gdb server

     qemu -kernel linux-5.0.1/arch/x86/boot/bzImage -initrd rootfs.img -append nokaslr -s -S

   • 建立gdb server和gdb之间的连接
     不要关闭当前正处于黑屏状态的gdb server,打开一个新终端，输入gdb

     cd linux-5.0.1
     file vmlinux #加载符号表
     break start_kernel #在内核函数处设置断点
     target remote:1234 #建立gdb和gdb server之间的连接
     c #回车让qemu上的Linux继续运行
     list #查看之前设置的断点
     
     

3. 将TCP网络程序集成到MenuOS中运行

   • 集成服务端

     git clone https://github.com/mengning/linuxnet.git
     cd linuxnet/lab2
     make
     cd ..

   • Integrated Client

     lab3 cd
     gedit Makefile # modify the Linux version is 5.0.1-Linux
     the make rootfs

   The results are as follows:
   

• Experimental Reference: https://github.com/mengning/net/tree/master/lab3
  
• Zhang Heng