/**
* vtpmx_ioc_new_dev - handler for the %VTPM_PROXY_IOC_NEW_DEV ioctl
* @file: /dev/vtpmx
* @ioctl: the ioctl number
* @arg: pointer to the struct vtpmx_proxy_new_dev
*
* Creates an anonymous file that is used by the process acting as a TPM to
* communicate with the client processes. The function will also add a new TPM
* device through which data is proxied to this TPM acting process. The caller
* will be provided with a file descriptor to communicate with the clients and
* major and minor numbers for the TPM device.
*/
static long vtpmx_ioc_new_dev(struct file *file, unsigned int ioctl,
unsigned long arg)
{
void __user *argp = (void __user *)arg;
struct vtpm_proxy_new_dev __user *vtpm_new_dev_p;
struct vtpm_proxy_new_dev vtpm_new_dev;
struct file *vtpm_file;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
vtpm_new_dev_p = argp;
if (copy_from_user(&vtpm_new_dev, vtpm_new_dev_p,
sizeof(vtpm_new_dev)))
return -EFAULT;
vtpm_file = vtpm_proxy_create_device(&vtpm_new_dev);
if (IS_ERR(vtpm_file))
return PTR_ERR(vtpm_file);
if (copy_to_user(vtpm_new_dev_p, &vtpm_new_dev,
sizeof(vtpm_new_dev))) {
put_unused_fd(vtpm_new_dev.fd);
fput(vtpm_file);
return -EFAULT;
}
fd_install(vtpm_new_dev.fd, vtpm_file);
return 0;
}
/*
* vtpmx_fops_ioctl: ioctl on /dev/vtpmx
*
* Return value:
* Returns 0 on success, a negative error code otherwise.
*/
static long vtpmx_fops_ioctl(struct file *f, unsigned int ioctl,
unsigned long arg)
{
void __user *argp = (void __user *)arg;
struct vtpm_proxy_new_dev __user *vtpm_new_dev_p;
struct vtpm_proxy_new_dev vtpm_new_dev;
struct file *file;
switch (ioctl) {
case VTPM_PROXY_IOC_NEW_DEV:
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
vtpm_new_dev_p = argp;
if (copy_from_user(&vtpm_new_dev, vtpm_new_dev_p,
sizeof(vtpm_new_dev)))
return -EFAULT;
file = vtpm_proxy_create_device(&vtpm_new_dev);
if (IS_ERR(file))
return PTR_ERR(file);
if (copy_to_user(vtpm_new_dev_p, &vtpm_new_dev,
sizeof(vtpm_new_dev))) {
put_unused_fd(vtpm_new_dev.fd);
fput(file);
return -EFAULT;
}
fd_install(vtpm_new_dev.fd, file);
return 0;
default:
return -ENOIOCTLCMD;
}
}