x86,aarch64,arm

Ciro Santilli 六四事件法轮功包卓轩 6b0f89a8b4 aosp		vor 7 Jahren
buildroot @ 8ce27bb9fe	12abf43b78 Attempt migration to Buildroot 2017.08 + kernel 4.12.	vor 7 Jahren
buildroot_patches	5ad68edd00 Linux 4.12, buildroot 2017.08, Ubuntu 17.10.	vor 7 Jahren
global_patch_dir	5393299433 Make global_patch_dir empty	vor 7 Jahren
hello_host	bb10d0e914 Improve hello_host readme	vor 7 Jahren
kernel_module	12abf43b78 Attempt migration to Buildroot 2017.08 + kernel 4.12.	vor 7 Jahren
linux @ d4160b40c5	eebcca4e69 You know what? v4.14	vor 7 Jahren
qemu @ 09fa182a4e	9ec43c4e88 lkmc_platform_device read example	vor 7 Jahren
rootfs_overlay	69eb98b5ab Document debugfs directory created automatically	vor 7 Jahren
.gitignore	8ddefa940e gem5	vor 7 Jahren
.gitmodules	23eddfb2a2 Shallow clone to save clone time and disk space	vor 7 Jahren
.travis.yml	2f82f78589 build without sdl for travis	vor 7 Jahren
CONTRIBUTING.md	6c51ecaf7b split build and run scripts due to option conflicts	vor 7 Jahren
LICENSE.txt	36cd620dd2 license	vor 8 Jahren
README.md	04d2d69623 Update README.md	vor 7 Jahren
S99	4727fadcc8 procfs example, S99 symlink	vor 7 Jahren
bibliography.md	6b0f89a8b4 aosp	vor 7 Jahren
build	f5a0111c3e Fix kernel_config_fragment that was getting ignored after gem5 addition	vor 7 Jahren
build-gem5	6ddbec9c99 Automate failed gem5 x86 attempt	vor 7 Jahren
buildroot_config_fragment	21da1e9b76 QEMU user mode fun	vor 7 Jahren
buildroot_config_fragment_x11	fa5c64a0b0 Make X11 optional	vor 7 Jahren
buildroot_override	9133fe023c qemu and linux as submodlues, S98 vs S99, readme benefits of Ctrl + C	vor 7 Jahren
busybox_config_fragment	8d668d6ed3 Use busybox devmem	vor 7 Jahren
configure	1be85b6dc2 configure: install automake	vor 7 Jahren
configure-gem5	8ddefa940e gem5	vor 7 Jahren
count-boot-instructions.md	6c51ecaf7b split build and run scripts due to option conflicts	vor 7 Jahren
device-tree.md	2ff3648e8f device tree info	vor 7 Jahren
ftrace.md	f80957cc40 frace docs an mmap minor improvements	vor 7 Jahren
gdb-step-debugging.md	c7bbc6029a Merge branch 'master' of github.com:cirosantilli/linux-kernel-module-cheat	vor 7 Jahren
gdbserver.md	027bca7927 Update gdbserver.md	vor 7 Jahren
gem5.md	3a34f9f2a5 gem5 kernel command line arguments	vor 7 Jahren
getting-started.md	03f418b53e document how to clean the build in getting started	vor 7 Jahren
init.md	920afba40a Disable networking on image with command line option ./build -p -n	vor 7 Jahren
kernel_config_arm-gem5	6ddbec9c99 Automate failed gem5 x86 attempt	vor 7 Jahren
kernel_config_fragment	2e04c96fad MODULE_VERSION and srcversion	vor 7 Jahren
kernel_config_x86_64-gem5	6ddbec9c99 Automate failed gem5 x86 attempt	vor 7 Jahren
kgdb.md	6c51ecaf7b split build and run scripts due to option conflicts	vor 7 Jahren
kmod.md	fa0a7e150d Less converstaion	vor 7 Jahren
maintainers.md	32c4ce0291 Further improve gem5 documentation	vor 7 Jahren
modprobe.md	fa0a7e150d Less converstaion	vor 7 Jahren
other-architectures.md	6c51ecaf7b split build and run scripts due to option conflicts	vor 7 Jahren
qemu-user-mode.md	21da1e9b76 QEMU user mode fun	vor 7 Jahren
qemumonitor	a8e11e6de9 qemumonitor helper, extra_append from CLI, pci_rescan.sh	vor 7 Jahren
record-and-replay.md	a070486855 Mention rr on record and replay	vor 7 Jahren
rootfs_post_build_script	920afba40a Disable networking on image with command line option ./build -p -n	vor 7 Jahren
run	6c51ecaf7b split build and run scripts due to option conflicts	vor 7 Jahren
run-on-host.md	c7bbc6029a Merge branch 'master' of github.com:cirosantilli/linux-kernel-module-cheat	vor 7 Jahren
rungdb	b3b1df5560 bak	vor 7 Jahren
rungdb-user	52c3ee15dc Userland without gdbserver	vor 7 Jahren
rungdbserver	b89ba9b799 gdbserver shared library	vor 7 Jahren
rungem5	3a34f9f2a5 gem5 kernel command line arguments	vor 7 Jahren
rungem5-shell	8ddefa940e gem5	vor 7 Jahren
screenshot.png	53c1b61879 screenshot, vm to description, qemu debug non intrusive	vor 8 Jahren
user_table	b2459d07f5 Add a non-root user user0 password "a"	vor 7 Jahren
x11.md	6c51ecaf7b split build and run scripts due to option conflicts	vor 7 Jahren
x11.png	01f6ca24e5 x11 screenshot and link to insmod C	vor 7 Jahren

Linux Kernel Module Cheat

Run one command, get a QEMU Buildroot BusyBox virtual machine built from source with several minimal Linux kernel 4.14 module development example tutorials with GDB and KGDB step debugging and minimal educational hardware models. Limited GEM5 full system support. "Tested" in x86, ARM and MIPS guests, Ubuntu 17.10 host.

Reserve 12Gb of disk and run:

git clone https://github.com/cirosantilli/linux-kernel-module-cheat
cd linux-kernel-module-cheat
./configure && ./build && ./run

The first build will take a while (GCC, Linux kernel), e.g.:

2 hours on a mid end 2012 laptop
30 minutes on a high end 2017 desktop

If you don't want to wait, you could also try to compile the examples and run them on your host computer as explained on the "Run on host" section, but as explained on that section, that is dangerous, limited, and will likely not work.

After QEMU opens up, you can start playing with the kernel modules:

root
insmod /hello.ko
insmod /hello2.ko
rmmod hello
rmmod hello2

This should print to the screen:

hello init
hello2 init
hello cleanup
hello2 cleanup

which are printk messages from init and cleanup methods of those modules.

All available modules can be found in the kernel_module directory.

See the getting started section for further details.

Getting started
Action
1. Step debugging
2. Other architectures
3. modprobe
4. X11
5. Count boot instructions
6. GEM5
7. ftrace
8. QEMU user mode
Failed action
1. Record and replay
Insane action
1. Run on host
2. Hello host
Conversation

README.md

Linux Kernel Module Cheat