这篇文章上次修改于 839 天前，可能其部分内容已经发生变化，如有疑问可询问作者。

本文属于错误示范，请参考eBPF on Android之打补丁和编译内核修正版进行内核修改与编译

虽然不知道当时怎么编译通过的...但现在看这样编译肯定不对

？

较新版本的安卓内核编译不需要预先编译完整系统，可以单独编译

具体怎么才是较新呢？请参考下面的链接内容

https://source.android.com/setup/build/building-kernels

说明

编译环境 kali-linux-2021.1-vmware-amd64
编译目标 android-msm-crosshatch-4.9-pie-qpr2

环境准备

sudo apt-get install bc
sudo apt-get install libssl-dev
sudo apt-get install gcc-arm-linux-gnueabi

过程

安装repo

https://source.android.com/setup/develop#installing-repo

调整python优先级

update-alternatives --install /usr/bin/python python /usr/bin/python2 100
update-alternatives --install /usr/bin/python python /usr/bin/python3 150

repo init

repo init -u git://mirrors.ustc.edu.cn/aosp/kernel/manifest -b android-msm-crosshatch-4.9-pie-qpr2 --depth=1

同步代码

repo sync -c -j8

重点

设置swap，我内存给的16G，这里swap也给16G，如果内存不够大可能在编译至vmlinux.o时失败
有关信息可参考 https://blog.seeflower.dev/archives/13/

sudo dd if=/dev/zero of=/swapfile bs=1k count=16384000
sudo mkswap /swapfile
sudo swapon /swapfile

编译内核

build/build.sh

TIPS 如果出现assembler command failed with exit code 1，请参考后面的问题部分

问题

遇到下列问题，记录解决办法

没有安装libssl-dev

/home/kali/Desktop/0508/private/msm-google/scripts/sign-file.c:25:10: fatal error: 'openssl/opensslv.h' file not found

安装之

sudo apt-get install libssl-dev

没有安装bc

/bin/sh: 1: bc: not found

安装之

sudo apt install bc

unrecognized option '-mfloat-abi=soft'

clang-5.0: error: assembler command failed with exit code 1 (use -v to see invocation)

参考 https://github.com/mapsme/omim/issues/3607

编辑private/msm-google/arch/arm64/kernel/vdso32/Makefile

去除第八行的-no-integrated-as

unrecognised emulation mode: armelf_linux_eabi

/..//bin/ld: unrecognised emulation mode: armelf_linux_eabi
Supported emulations: elf_x86_64 elf32_x86_64 elf_i386 elf_iamcu elf_l1om elf_k1om i386pep i386pe
clang-5.0: error: linker command failed with exit code 1 (use -v to see invocation)

安装gcc-arm-linux-gnueabi

sudo apt-get install gcc-arm-linux-gnueabi

结果

最终编译成功输出如下

make: Leaving directory '/home/kali/Desktop/0508/out/android-msm-bluecross-4.9/private/msm-google'
 Copying kernel UAPI headers to /home/kali/Desktop/0508/out/android-msm-bluecross-4.9/dist/kernel-uapi-headers.tar.gz
========================================================
 Copying kernel headers to /home/kali/Desktop/0508/out/android-msm-bluecross-4.9/dist/kernel-headers.tar.gz
~/Desktop/0508/private/msm-google ~/Desktop/0508
~/Desktop/0508
========================================================
 Copying modules files
  lib/modules/4.9.124-g86541eee-dirty_audio-g4360e08/extra/wlan.ko
  lib/modules/4.9.124-g86541eee-dirty_audio-g4360e08/kernel/drivers/input/touchscreen/stm/ftm5.ko
  lib/modules/4.9.124-g86541eee-dirty_audio-g4360e08/kernel/drivers/input/touchscreen/sec_ts/sec_touch.ko
  lib/modules/4.9.124-g86541eee-dirty_audio-g4360e08/kernel/techpack/audio/soc/pinctrl-wcd.ko
  lib/modules/4.9.124-g86541eee-dirty_audio-g4360e08/kernel/techpack/audio/ipc/wcd-dsp-glink.ko
  lib/modules/4.9.124-g86541eee-dirty_audio-g4360e08/kernel/techpack/audio/asoc/snd-soc-sdm845-max98927.ko
  lib/modules/4.9.124-g86541eee-dirty_audio-g4360e08/kernel/techpack/audio/asoc/snd-soc-sdm845.ko
  lib/modules/4.9.124-g86541eee-dirty_audio-g4360e08/kernel/techpack/audio/asoc/codecs/wcd934x/snd-soc-wcd934x.ko
  lib/modules/4.9.124-g86541eee-dirty_audio-g4360e08/kernel/techpack/audio/asoc/codecs/snd-soc-wcd-spi.ko
  lib/modules/4.9.124-g86541eee-dirty_audio-g4360e08/kernel/techpack/audio/asoc/codecs/wcd-core.ko
  lib/modules/4.9.124-g86541eee-dirty_audio-g4360e08/kernel/techpack/audio/asoc/codecs/snd-soc-wcd9xxx.ko
  lib/modules/4.9.124-g86541eee-dirty_audio-g4360e08/kernel/techpack/audio/asoc/codecs/snd-soc-cs35l36.ko
========================================================
 Copying unstripped module files for debugging purposes (not loaded on device)
========================================================
 Files copied to /home/kali/Desktop/0508/out/android-msm-bluecross-4.9/dist

SeeFlowerX

android-msm-crosshatch-4.9-pie-qpr2内核编译记录