/*
* Join a (named) session keyring.
*
* Create and join an anonymous session keyring or join a named session
* keyring, creating it if necessary. A named session keyring must have Search
* permission for it to be joined. Session keyrings without this permit will
* be skipped over.
*
* If successful, the ID of the joined session keyring will be returned.
*/
long keyctl_join_session_keyring(const char __user *_name)
{
char *name;
long ret;
/* fetch the name from userspace */
name = NULL;
if (_name) {
name = strndup_user(_name, PAGE_SIZE);
if (IS_ERR(name)) {
ret = PTR_ERR(name);
goto error;
}
}
/* join the session */
ret = join_session_keyring(name);
kfree(name);
error:
return ret;
}
/*
* join the session keyring
* - implements keyctl(KEYCTL_JOIN_SESSION_KEYRING)
*/
long keyctl_join_session_keyring(const char __user *_name)
{
char *name;
long nlen, ret;
/* fetch the name from userspace */
name = NULL;
if (_name) {
ret = -EFAULT;
nlen = strnlen_user(_name, PAGE_SIZE - 1);
if (nlen <= 0)
goto error;
ret = -EINVAL;
if (nlen > PAGE_SIZE - 1)
goto error;
ret = -ENOMEM;
name = kmalloc(nlen + 1, GFP_KERNEL);
if (!name)
goto error;
ret = -EFAULT;
if (copy_from_user(name, _name, nlen + 1) != 0)
goto error2;
}
/* join the session */
ret = join_session_keyring(name);
error2:
kfree(name);
error:
return ret;
} /* end keyctl_join_session_keyring() */