init

5 files changed, 62 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
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index 0000000..6dd29b7
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+bin/
\ No newline at end of file
diff --git a/README.md b/README.md
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--- /dev/null
+++ b/README.md
@@ -0,0 +1 @@
+### Linux LKM thingy
diff --git a/build.sh b/build.sh
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--- /dev/null
+++ b/build.sh
@@ -0,0 +1,31 @@
+set -e
+
+cd ${0%/*} # go to project root
+
+KERNEL="bin/kernel-$(uname -r)"
+INITRAMFS="bin/initramfs"
+
+mkdir -p bin
+
+# get the kernel
+sudo cp /boot/vmlinuz-linux-lts "$KERNEL"
+
+# initramfs directory
+rm -rf $INITRAMFS
+mkdir -p $INITRAMFS
+
+# copy the init file
+cp src/init $INITRAMFS
+chmod +x $INITRAMFS/init
+
+# get the busybox things
+install -D $(which busybox) $INITRAMFS/bin/busybox
+ln -sf busybox $INITRAMFS/bin/sh
+
+# make the image
+(cd $INITRAMFS; find . | cpio -H newc -o | gzip > ../initramfs.img )
+
+qemu-system-x86_64 \
+     -kernel "$KERNEL" \
+     -initrd "$INITRAMFS.img" \
+     -append "console=ttyS0" -nographic
diff --git a/src/init b/src/init
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--- /dev/null
+++ b/src/init
@@ -0,0 +1,8 @@
+#!/bin/sh
+
+echo "Hello, whats your name?"
+read -r name
+hostname $name
+
+export PS1="\[\033[32m\]\h:\[\033[36m\]\w\[\033[37m\]# " # set the prompt
+exec /bin/sh
diff --git a/src/module.c b/src/module.c
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--- /dev/null
+++ b/src/module.c
@@ -0,0 +1,21 @@
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/printk.h>
+
+static int __init init(void)
+{
+    pr_info("Hello, world 4\n");
+    return 0;
+}
+
+static void __exit exit(void)
+{
+    pr_info("Goodbye, world 4\n");
+}
+
+module_init(init_hello_4);
+module_exit(cleanup_hello_4);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Kartofen");
+MODULE_DESCRIPTION("A simple keylogger kernel module");