Commit 281117cc authored by Al Viro's avatar Al Viro
Browse files

convert setns(2) to fdget()/fdput() 



Reviewed-by: default avatarChristian Brauner <brauner@kernel.org>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent fe15c26e

kernel/nsproxy.c

+8 −9
Original line number Diff line number Diff line
@@ -545,21 +545,20 @@ static void commit_nsset(struct nsset *nsset) 


SYSCALL_DEFINE2(setns, int, fd, int, flags)

{

	struct file *file;

	struct fd f = fdget(fd);

	struct ns_common *ns = NULL;

	struct nsset nsset = {};

	int err = 0;



	file = fget(fd);

	if (!file)

	if (!f.file)

		return -EBADF;



	if (proc_ns_file(file)) {

		ns = get_proc_ns(file_inode(file));

	if (proc_ns_file(f.file)) {

		ns = get_proc_ns(file_inode(f.file));

		if (flags && (ns->ops->type != flags))

			err = -EINVAL;

		flags = ns->ops->type;

	} else if (!IS_ERR(pidfd_pid(file))) {

	} else if (!IS_ERR(pidfd_pid(f.file))) {

		err = check_setns_flags(flags);

	} else {

		err = -EINVAL;
@@ -571,17 +570,17 @@ SYSCALL_DEFINE2(setns, int, fd, int, flags) 
	if (err)

		goto out;



	if (proc_ns_file(file))

	if (proc_ns_file(f.file))

		err = validate_ns(&nsset, ns);

	else

		err = validate_nsset(&nsset, file->private_data);

		err = validate_nsset(&nsset, f.file->private_data);

	if (!err) {

		commit_nsset(&nsset);

		perf_event_namespaces(current);

	}

	put_nsset(&nsset);

out:

	fput(file);

	fdput(f);

	return err;

}