Added kernel hello world compilation

1 files changed, 54 insertions, 0 deletions

diff --git a/md/writeup/kernel_hello_world.md b/md/writeup/kernel_hello_world.md
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+# Kernel compile "Hello world"
+
+Compile minimal linux kernel module. 
+
+## Files
+
+You need to create to files __Makefile__ and __hello_world.c__.
+
+__Makefile__
+```
+obj-m += hello_world.o
+
+KDIR ?= /lib/modules/$(shell uname -r)/build
+
+all:
+	make -C $(KDIR) M=$(PWD) modules
+
+clean:
+	make -C $(KDIR) M=$(PWD) clean
+```
+
+
+__hello_world.c__
+```
+//http://www.tldp.org/LDP/lkmpg/2.4/html/c147.htm
+#include <linux/module.h>  /* Needed by all modules */
+#include <linux/kernel.h>
+
+int hello_world_init( void )
+{
+	printk(KERN_DEBUG "Hello World!\n");
+	return 0;
+}
+
+void hello_world_exit( void )
+{
+	printk(KERN_DEBUG "Exit Hello World!\n");
+}
+
+module_init( hello_world_init );
+module_exit( hello_world_exit );
+
+MODULE_LICENSE("GPL");
+```
+
+
+
+##Compile
+
+Now if you havent done so ... install kernel headers of kernel that your system have now. And everything should be there.
+
+```
+make
+```