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An example of writing an external, simple Linux kernel module, in V.

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spytheman/simple_kernel_module_in_v

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The purpose of this repo, is to show how to write and testa very simple Linux kernel module,usingthe V programming language .

NB: this isvery experimental and may break in the future.It works as of 2021/10/23, withgcc 10.3.0 andV 0.2.4 008d15d .Update: it also works as of 2022/08/16, withgcc 10.3.0 andV 0.3.0 3bc01d6 too.

The-no-builtin -no-preludes options produce C code, that may noteven compile, if it depends on some of V'sbuiltin module features, likedynamic arrays, maps, array/string methods, string interpolation etc.

Prerequisites:

A C compiler, and a V compiler.

On a Debian system, you can install them with:

apt-get install gccgit clone https://github.com/vlang/v&&cd v&& make&& ./v symlink

Once you have them installed, you can keep them up to date with:

apt-get upgradev up

Building the kernel module:

make

See alsohttps://www.kernel.org/doc/html/latest/kbuild/modules.html .

Loading the module in your kernel:

sudo insmod vhellokernel.ko

Verifying that the module was loaded in the kernel:

cat /proc/modules |grep vhellokernel

If everything is ok, you should see something like this:

vhellokernel 16384 0 - Live 0x0000000000000000 (OE)

Usedmesg | tail to see the messages that the module wrote.

Removing the module from your kernel:

sudo rmmod vhellokernel.ko

make clean test

0[12:47:53] /v/misc/2021_10_22__02/simple_kernel_module_in_v LINUX $ make clean testmake -C /lib/modules/`uname -r`/build M=$PWD cleanmake[1]: Entering directory '/usr/src/linux-headers-5.11.0-38-generic'  CLEAN   /v/misc/2021_10_22__02/simple_kernel_module_in_v/Module.symversmake[1]: Leaving directory '/usr/src/linux-headers-5.11.0-38-generic'rm -rf vhellokernel.o vhellokernel.cv -no-builtin -no-preludes -o vhellokernel.c vhellokernel.vmake -C /lib/modules/`uname -r`/build M=$PWD modulesmake[1]: Entering directory '/usr/src/linux-headers-5.11.0-38-generic'  CC [M]  /v/misc/2021_10_22__02/simple_kernel_module_in_v/vhellokernel.o  MODPOST /v/misc/2021_10_22__02/simple_kernel_module_in_v/Module.symvers  CC [M]  /v/misc/2021_10_22__02/simple_kernel_module_in_v/vhellokernel.mod.o  LD [M]  /v/misc/2021_10_22__02/simple_kernel_module_in_v/vhellokernel.komake[1]: Leaving directory '/usr/src/linux-headers-5.11.0-38-generic'make loadmake[1]: Entering directory '/v/misc/2021_10_22__02/simple_kernel_module_in_v'sudo insmod vhellokernel.komake[1]: Leaving directory '/v/misc/2021_10_22__02/simple_kernel_module_in_v'cat /proc/modules |grep vhellokernelvhellokernel 16384 0 - Live 0x0000000000000000 (OE)make unloadmake[1]: Entering directory '/v/misc/2021_10_22__02/simple_kernel_module_in_v'sudo rmmod vhellokernel.komake[1]: Leaving directory '/v/misc/2021_10_22__02/simple_kernel_module_in_v'0[12:47:56] /v/misc/2021_10_22__02/simple_kernel_module_in_v LINUX $

Further reading:

  1. https://tldp.org/LDP/lkmpg/2.6/lkmpg.pdf

  2. https://www.kernel.org/doc/html/latest/kbuild/modules.html

  3. https://github.com/vlang/v/blob/master/doc/docs.md

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