linux-rootkit

commit c33c65e54388ecc98af64cf09b961cd93f829dfe
Author: deurzen <m.deurzen@tum.de>
Date:   Fri, 20 Nov 2020 07:58:28 +0100

initial

Diffstat:
A
Makefile
 | 
10
++++++++++
A
src/g7.c
 | 
102
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
A
src/ioctl.c
 | 
14
++++++++++++++
A
src/ioctl.h
 | 
18
++++++++++++++++++

4 files changed, 144 insertions(+), 0 deletions(-)
diff --git a/Makefile b/Makefile
@@ -0,0 +1,10 @@
+obj-m += g7.o
+g7-objs := ./src/g7.o ./src/ioctl.o
+
+KERNELDIR := /lib/modules/$(shell uname -r)/build
+
+all:
+	make -C $(KERNELDIR) M=$(PWD) modules
+
+clean:
+	make -C $(KERNELDIR) M=$(PWD) clean
diff --git a/src/g7.c b/src/g7.c
@@ -0,0 +1,102 @@
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/proc_fs.h>
+#include <linux/uaccess.h>
+
+#include "ioctl.h"
+
+#define BUFLEN 4096
+
+
+static int  __init g7_init(void);
+static void __exit g7_exit(void);
+
+static int     g7_open(struct inode *, struct file *);
+static int     g7_release(struct inode *, struct file *);
+static ssize_t g7_read(struct file *, char __user *, size_t, loff_t *);
+static ssize_t g7_write(struct file *, const char *, size_t, loff_t *);
+static long    g7_ioctl(struct file *, unsigned int, unsigned long);
+
+
+static struct mutex lock;
+static char buf[BUFLEN];
+
+static struct file_operations g7_fops =
+{
+    .owner          = THIS_MODULE,
+    .read           = g7_read,
+    .write          = g7_write,
+    .open           = g7_open,
+    .unlocked_ioctl = g7_ioctl,
+    .release        = g7_release,
+};
+
+
+
+static int
+g7_open(struct inode *inode, struct file *file)
+{
+        printk(KERN_INFO "g7_open\n");
+        return 0;
+}
+
+static int
+g7_release(struct inode *inode, struct file *file)
+{
+        printk(KERN_INFO "g7_release\n");
+        return 0;
+}
+
+static ssize_t
+g7_read(struct file *filp, char __user *buf, size_t len, loff_t *off)
+{
+        printk(KERN_INFO "g7_read\n");
+        return 0;
+}
+
+static ssize_t
+g7_write(struct file *filp, const char __user *buf, size_t len, loff_t *off)
+{
+        printk(KERN_INFO "g7_write\n");
+        return 0;
+}
+
+static long
+g7_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+    switch (cmd) {
+    case G7_PING: handle_ping(arg); break;
+    default: break;
+    }
+
+    return 0;
+}
+
+
+static int
+g7_init(void)
+{
+    mutex_init(&lock);
+    proc_create_data(G7_DEVICE, S_IRUSR | S_IWUSR, 0, &g7_fops, buf);
+
+    printk(KERN_INFO "g7 initialized\n");
+
+    return 0;
+}
+
+static void
+g7_exit(void)
+{
+    remove_proc_entry(G7_DEVICE, 0);
+}
+
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Group 7");
+MODULE_DESCRIPTION("Assignment 3");
+
+module_init(g7_init);
+module_exit(g7_exit);
diff --git a/src/ioctl.c b/src/ioctl.c
@@ -0,0 +1,14 @@
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#include "ioctl.h"
+
+
+void
+handle_ping(unsigned long arg)
+{
+    if (!strcmp("PING", (const char *)arg)) {
+        printk(KERN_INFO "caught PING\n");
+        printk(KERN_INFO "sending PONG\n");
+    }
+}
diff --git a/src/ioctl.h b/src/ioctl.h
@@ -0,0 +1,18 @@
+#ifndef _GROUP7_CHARDEV_H
+#define _GROUP7_CHARDEV_H
+
+#include <linux/ioctl.h>
+
+#define G7_MAGIC_NUMBER '@'
+#define G7_DEVICE "G7RKP"
+
+#define G7_PING  _IOWR(G7_MAGIC_NUMBER, 0x0, char *)
+
+#define G7_WRITE _IOW(G7_MAGIC_NUMBER, 0x1, char *)
+#define G7_READ  _IOW(G7_MAGIC_NUMBER, 0x2, char *)
+
+
+void handle_ping(unsigned long);
+
+
+#endif//_GROUP7_CHARDEV_H