# Linux Kernel 2.6.32 Build

我的環境是:
* Ubuntu 16.04 x64
* qemu
* linux-2.6.32
* busybox-1.31.0

目錄:

mykernel
|--linux-2.6.32
|--busybox-1.31.0

---

## qemu

$ sudo apt-get install qemu qemu-system

## Linux kernel 編譯

$ wget https://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.32.tar.gz
$ tar zxvf linux-2.6.32.tar.gz
$ cd linux-2.6.32/
$ sudo apt-get install libncurses5-dev build-essential kernel-package
$ make mrproper
$ make menuconfig
$ make
$ make all
$ make modules

### make menuconfig

編譯前配置參數

KernelHacking -->
[*]Compile the kernel with debug info
[*]Compile the kernel with frame pointers
[ ]Write protect kernel read-only data structures

Processor type and features-->
[ ]Paravirtualized guest support

### make

1.修改**linux-2.6.32/arch/x86/vdso/Makefile**中:

28行 VDSO_LDFLAGS_vdso.lds = -m elf_x86_64 的 "-m elf_x86_64" 改成 "-m64"
72行 VDSO_LDFLAGS_vdso32.lds = -m elf_i386 的 "-m elf_i386" 改成 "-m32"

2.修改**linux-2.6.32/drivers/net/igbvf/igbvf.h**中:

128行 struct page page; 把這個註解掉

3.修改**linux-2.6.32/kernel/timeconst.pl**中:

373行 defined(@val) 改成 @val

### gcc-4.9

把原本的**gcc-5.3**降版成**gcc-4.9**才能成功編譯

$ sudo apt-get install g++-4.9
$ sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.9 20
$ sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-5 10
$ sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.9 20
$ sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-5 10
$ sudo update-alternatives --install /usr/bin/cc cc /usr/bin/gcc 30
$ sudo update-alternatives --set cc /usr/bin/gcc
$ sudo update-alternatives --install /usr/bin/c++ c++ /usr/bin/g++ 30
$ sudo update-alternatives --set c++ /usr/bin/g++

改回來
$ sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-5 60

## busybox

$ wget https://busybox.net/downloads/busybox-1.31.0.tar.bz2
$ tar -jxvf busybox-1.31.0.tar.bz2
$ cd busybox-1.31.0
$ make menuconfig
$ make install

### make menuconfig

編譯前配置參數

Busybox Settings -> Build Options -->
[*] Build Busybox as a static binary

Linux System Utilities -->
[ ] Support mounting NFS file system

Networking Utilities -->
[ ] inetd

### file system

在編譯好後,busybox目錄下有個**_install**

$ cd _install
$ mkdir proc sys dev etc etc/init.d
$ vim etc/init.d/rcS

#!/bin/sh
mount -t proc proc /proc
mount -t sysfs proc /sys
/sbin/mdev -s

$ chmod +x etc/init.d/rcS

此時是在**_install**下

$ find . | cpio -o --format=newc > ../rootfs.img

## Run

在**linux-2.6.32**下運行

$ qemu-system-x86_64 -m 512 -kernel arch/x86_64/boot/bzImage -initrd ../busybox-1.31.0/rootfs.img -append "root=/dev/ram rdinit=/sbin/init"

$ qemu-system-x86_64 -m 512 -kernel arch/x86_64/boot/bzImage -initrd ../busybox-1.31.0/rootfs.img -append "root=/dev/ram rdinit=/sbin/init console=ttyS0" --nographic -s -S
(gdb) target remote localhost:1234


## Reference
* http://pwn4.fun/2017/04/17/Linux%E5%86%85%E6%A0%B8%E6%BC%8F%E6%B4%9E%E5%88%A9%E7%94%A8%EF%BC%88%E4%B8%80%EF%BC%89%E7%8E%AF%E5%A2%83%E9%85%8D%E7%BD%AE/
* https://www.cnblogs.com/hac425/p/9416886.html
* https://blog.csdn.net/ytusdc/article/details/77980915
* https://jacobpan3g.github.io/cn/2017/09/01/solve-kernel2.6.36-build-error-in-ubuntu16.04/

* https://zhuanlan.zhihu.com/p/105069730