3rd-party/linux-kernel-module-cheat
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failed fops attempt

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This commit is contained in:
Ciro Santilli
2017-06-08 07:49:14 +01:00
parent 3893ea9272
commit bf538cd3a6
5 changed files with 88 additions and 21 deletions
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32
kernel_module/fops.c
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@@ -28,10 +28,9 @@ Here we use debugfs.
MODULE_LICENSE("GPL");
static struct dentry *dir;
static char data[] = {'a', 'b', 'c', 'd'};
static int fop_open(struct inode *inode, struct file *file)
static int open(struct inode *inode, struct file *filp)
{
printk(KERN_INFO "open\n");
return 0;
@@ -42,7 +41,7 @@ static int fop_open(struct inode *inode, struct file *file)
* Then when userland reads the same file descriptor again,
* we start from that point instead.
* */
static ssize_t fop_read(struct file *file, char __user *buf, size_t len, loff_t *off)
static ssize_t read(struct file *filp, char __user *buf, size_t len, loff_t *off)
{
ssize_t ret;
printk(KERN_INFO "read\n");
@@ -67,7 +66,7 @@ static ssize_t fop_read(struct file *file, char __user *buf, size_t len, loff_t
* we must return ENOSPC if the user tries to write more
* than the size of our buffer. Otherwise, Bash > just
* keeps trying to write to it infinitely. */
static ssize_t fop_write(struct file *file, const char __user *buf, size_t len, loff_t *off)
static ssize_t write(struct file *filp, const char __user *buf, size_t len, loff_t *off)
{
ssize_t ret;
printk(KERN_INFO "write\n");
@@ -96,13 +95,13 @@ static ssize_t fop_write(struct file *file, const char __user *buf, size_t len,
Called on the last close:
http://stackoverflow.com/questions/11393674/why-is-the-close-function-is-called-release-in-struct-file-operations-in-the-l
*/
static int fop_release (struct inode *inode, struct file *file)
static int release (struct inode *inode, struct file *filp)
{
printk(KERN_INFO "release\n");
return 0;
}
static loff_t fop_llseek(struct file *filp, loff_t off, int whence)
static loff_t llseek(struct file *filp, loff_t off, int whence)
{
loff_t newpos;
printk(KERN_INFO "llseek\n");
@@ -129,26 +128,17 @@ static loff_t fop_llseek(struct file *filp, loff_t off, int whence)
}
static const struct file_operations fops = {
.llseek = fop_llseek,
.open = fop_open,
.read = fop_read,
.release = fop_release,
.write = fop_write,
.llseek = llseek,
.open = open,
.read = read,
.release = release,
.write = write,
};
static int myinit(void)
{
struct dentry *file;
dir = debugfs_create_dir("lkmc_fops", 0);
if (!dir) {
printk(KERN_ALERT "debugfs_create_dir failed");
return -1;
}
file = debugfs_create_file("f", 0666, dir, NULL, &fops);
if (!file) {
printk(KERN_ALERT "debugfs_create_file failed");
return -1;
}
debugfs_create_file("f", 0666, dir, NULL, &fops);
return 0;
}