initial commit uwu

main
anna 2 years ago
commit 7680f2f614
Signed by: fef
GPG Key ID: EC22E476DC2D3D84

7
.gitignore vendored

@ -0,0 +1,7 @@
*.cmd
*.ko
*.mod
*.mod.c
*.o
Module.symvers
modules.order

@ -0,0 +1,24 @@
DEBUG ?= n
ifeq ($(DEBUG),y)
EXTRA_CFLAGS += -Og -g -DDEBUG
else
EXTRA_CFLAGS += -O2
endif
EXTRA_CFLAGS += -I$(PWD)/include
obj-m += keymash.o
keymash-sources = src/keymash.c
keymash-objs = $(keymash-sources:.c=.o)
keymash.ko:
make -C "/lib/modules/$(shell uname -r)/build" M="$(PWD)" modules
clean:
make -C "/lib/modules/$(shell uname -r)/build" M="$(PWD)" clean
all: keymash.ko

@ -0,0 +1,135 @@
#include <linux/cdev.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/printk.h>
#include <linux/random.h>
#include <linux/slab.h>
#include <linux/types.h>
MODULE_LICENSE("Dual BSD/GPL");
MODULE_AUTHOR("fef <owo@fef.moe>");
MODULE_DESCRIPTION("gay keymash character device driver");
MODULE_VERSION("0.1.0");
#define keymash_debug(msg, ...) printk(KERN_DEBUG "keymash: " msg, ##__VA_ARGS__)
#define keymash_info(msg, ...) printk(KERN_INFO "keymash: " msg, ##__VA_ARGS__)
#define keymash_warn(msg, ...) printk(KERN_WARN "keymash: " msg, ##__VA_ARGS__)
#define keymash_err(msg, ...) printk(KERN_ERR "keymash: " msg, ##__VA_ARGS__)
static dev_t keymash_dev = MKDEV(0, 0);
static struct cdev keymash_cdev;
static struct class *keymash_class;
static struct device *keymash_device;
#define KEYMASH_MINOR_COUNT 1
#define KEYMASH_DEVICE_NAME "keymash"
static const char keymash_chrs[] = "asdfghjkl;";
#define KEYMASH_CHRS_LEN (ARRAY_SIZE(keymash_chrs) - 1) /* minus NUL */
static void keymash_gay(void *buf, size_t len)
{
unsigned char *cbuf = buf;
get_random_bytes(buf, len);
while (len--) {
unsigned char rnd = *cbuf;
*cbuf++ = keymash_chrs[rnd % KEYMASH_CHRS_LEN];
}
}
static ssize_t keymash_read(struct file *file, char __user *user_buffer,
size_t size, loff_t *offset)
{
ssize_t ret;
void *gay = kmalloc(size, GFP_KERNEL);
if (gay) {
keymash_gay(gay, size);
if (copy_to_user(user_buffer, gay, size))
ret = -EFAULT;
else
ret = size;
kfree(gay);
} else {
ret = -ENOMEM;
}
return ret;
}
static const struct file_operations keymash_fops = {
.owner = THIS_MODULE,
.read = keymash_read,
};
static char *keymash_devnode(struct device *dev, umode_t *mode)
{
if (mode)
*mode = 0444;
return NULL;
}
__init
static int keymash_init(void)
{
int err = -1;
err = alloc_chrdev_region(&keymash_dev, 0, KEYMASH_MINOR_COUNT, KEYMASH_DEVICE_NAME);
if (err < 0) {
keymash_err("alloc_chrdev_region() returned %d\n", err);
goto err_alloc_chrdev_region;
}
keymash_debug("using device major number %d\n", MAJOR(keymash_dev));
cdev_init(&keymash_cdev, &keymash_fops);
err = cdev_add(&keymash_cdev, keymash_dev, 1);
if (err < 0) {
keymash_err("cdev_init() returned %d\n", err);
goto err_cdev_add;
}
keymash_class = class_create(THIS_MODULE, "kmsh");
if (IS_ERR(keymash_class)) {
err = PTR_ERR(keymash_class);
keymash_err("class_create() returned %d\n", err);
goto err_class_create;
}
keymash_class->devnode = keymash_devnode;
keymash_device = device_create(keymash_class, NULL, keymash_dev, NULL, KEYMASH_DEVICE_NAME);
if (IS_ERR(keymash_device)) {
err = PTR_ERR(keymash_device);
keymash_err("device_create() returned %d\n", err);
goto err_device_create;
}
return 0;
err_device_create:
class_unregister(keymash_class);
class_destroy(keymash_class);
err_class_create:
cdev_del(&keymash_cdev);
err_cdev_add:
unregister_chrdev_region(keymash_dev, KEYMASH_MINOR_COUNT);
err_alloc_chrdev_region:
return err;
}
module_init(keymash_init);
__exit
static void keymash_exit(void)
{
device_destroy(keymash_class, keymash_dev);
class_unregister(keymash_class);
class_destroy(keymash_class);
cdev_del(&keymash_cdev);
unregister_chrdev_region(keymash_dev, KEYMASH_MINOR_COUNT);
keymash_info("sayounara sekai UwU\n");
}
module_exit(keymash_exit);
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