1 files changed, 0 insertions, 761 deletions

diff --git a/fs/autofs4/dev-ioctl.c b/fs/autofs4/dev-ioctl.c
deleted file mode 100644
index a2281ab2b957..000000000000
--- a/fs/autofs4/dev-ioctl.c
+++ /dev/null
@@ -1,761 +0,0 @@
-/*
- * Copyright 2008 Red Hat, Inc. All rights reserved.
- * Copyright 2008 Ian Kent <raven@themaw.net>
- *
- * This file is part of the Linux kernel and is made available under
- * the terms of the GNU General Public License, version 2, or at your
- * option, any later version, incorporated herein by reference.
- */
-
-#include <linux/module.h>
-#include <linux/vmalloc.h>
-#include <linux/miscdevice.h>
-#include <linux/init.h>
-#include <linux/wait.h>
-#include <linux/namei.h>
-#include <linux/fcntl.h>
-#include <linux/file.h>
-#include <linux/fdtable.h>
-#include <linux/sched.h>
-#include <linux/cred.h>
-#include <linux/compat.h>
-#include <linux/syscalls.h>
-#include <linux/magic.h>
-#include <linux/dcache.h>
-#include <linux/uaccess.h>
-#include <linux/slab.h>
-
-#include "autofs_i.h"
-
-/*
- * This module implements an interface for routing autofs ioctl control
- * commands via a miscellaneous device file.
- *
- * The alternate interface is needed because we need to be able open
- * an ioctl file descriptor on an autofs mount that may be covered by
- * another mount. This situation arises when starting automount(8)
- * or other user space daemon which uses direct mounts or offset
- * mounts (used for autofs lazy mount/umount of nested mount trees),
- * which have been left busy at at service shutdown.
- */
-
-typedef int (*ioctl_fn)(struct file *, struct autofs_sb_info *,
-			struct autofs_dev_ioctl *);
-
-static int check_name(const char *name)
-{
-	if (!strchr(name, '/'))
-		return -EINVAL;
-	return 0;
-}
-
-/*
- * Check a string doesn't overrun the chunk of
- * memory we copied from user land.
- */
-static int invalid_str(char *str, size_t size)
-{
-	if (memchr(str, 0, size))
-		return 0;
-	return -EINVAL;
-}
-
-/*
- * Check that the user compiled against correct version of autofs
- * misc device code.
- *
- * As well as checking the version compatibility this always copies
- * the kernel interface version out.
- */
-static int check_dev_ioctl_version(int cmd, struct autofs_dev_ioctl *param)
-{
-	int err = 0;
-
-	if ((param->ver_major != AUTOFS_DEV_IOCTL_VERSION_MAJOR) ||
-	    (param->ver_minor > AUTOFS_DEV_IOCTL_VERSION_MINOR)) {
-		pr_warn("ioctl control interface version mismatch: "
-			"kernel(%u.%u), user(%u.%u), cmd(0x%08x)\n",
-			AUTOFS_DEV_IOCTL_VERSION_MAJOR,
-			AUTOFS_DEV_IOCTL_VERSION_MINOR,
-			param->ver_major, param->ver_minor, cmd);
-		err = -EINVAL;
-	}
-
-	/* Fill in the kernel version. */
-	param->ver_major = AUTOFS_DEV_IOCTL_VERSION_MAJOR;
-	param->ver_minor = AUTOFS_DEV_IOCTL_VERSION_MINOR;
-
-	return err;
-}
-
-/*
- * Copy parameter control struct, including a possible path allocated
- * at the end of the struct.
- */
-static struct autofs_dev_ioctl *
-copy_dev_ioctl(struct autofs_dev_ioctl __user *in)
-{
-	struct autofs_dev_ioctl tmp, *res;
-
-	if (copy_from_user(&tmp, in, AUTOFS_DEV_IOCTL_SIZE))
-		return ERR_PTR(-EFAULT);
-
-	if (tmp.size < AUTOFS_DEV_IOCTL_SIZE)
-		return ERR_PTR(-EINVAL);
-
-	if (tmp.size > AUTOFS_DEV_IOCTL_SIZE + PATH_MAX)
-		return ERR_PTR(-ENAMETOOLONG);
-
-	res = memdup_user(in, tmp.size);
-	if (!IS_ERR(res))
-		res->size = tmp.size;
-
-	return res;
-}
-
-static inline void free_dev_ioctl(struct autofs_dev_ioctl *param)
-{
-	kfree(param);
-}
-
-/*
- * Check sanity of parameter control fields and if a path is present
- * check that it is terminated and contains at least one "/".
- */
-static int validate_dev_ioctl(int cmd, struct autofs_dev_ioctl *param)
-{
-	int err;
-
-	err = check_dev_ioctl_version(cmd, param);
-	if (err) {
-		pr_warn("invalid device control module version "
-			"supplied for cmd(0x%08x)\n", cmd);
-		goto out;
-	}
-
-	if (param->size > AUTOFS_DEV_IOCTL_SIZE) {
-		err = invalid_str(param->path, param->size - AUTOFS_DEV_IOCTL_SIZE);
-		if (err) {
-			pr_warn(
-			  "path string terminator missing for cmd(0x%08x)\n",
-			  cmd);
-			goto out;
-		}
-
-		err = check_name(param->path);
-		if (err) {
-			pr_warn("invalid path supplied for cmd(0x%08x)\n",
-				cmd);
-			goto out;
-		}
-	}
-
-	err = 0;
-out:
-	return err;
-}
-
-/*
- * Get the autofs super block info struct from the file opened on
- * the autofs mount point.
- */
-static struct autofs_sb_info *autofs_dev_ioctl_sbi(struct file *f)
-{
-	struct autofs_sb_info *sbi = NULL;
-	struct inode *inode;
-
-	if (f) {
-		inode = file_inode(f);
-		sbi = autofs_sbi(inode->i_sb);
-	}
-	return sbi;
-}
-
-/* Return autofs dev ioctl version */
-static int autofs_dev_ioctl_version(struct file *fp,
-				    struct autofs_sb_info *sbi,
-				    struct autofs_dev_ioctl *param)
-{
-	/* This should have already been set. */
-	param->ver_major = AUTOFS_DEV_IOCTL_VERSION_MAJOR;
-	param->ver_minor = AUTOFS_DEV_IOCTL_VERSION_MINOR;
-	return 0;
-}
-
-/* Return autofs module protocol version */
-static int autofs_dev_ioctl_protover(struct file *fp,
-				     struct autofs_sb_info *sbi,
-				     struct autofs_dev_ioctl *param)
-{
-	param->protover.version = sbi->version;
-	return 0;
-}
-
-/* Return autofs module protocol sub version */
-static int autofs_dev_ioctl_protosubver(struct file *fp,
-					struct autofs_sb_info *sbi,
-					struct autofs_dev_ioctl *param)
-{
-	param->protosubver.sub_version = sbi->sub_version;
-	return 0;
-}
-
-/* Find the topmost mount satisfying test() */
-static int find_autofs_mount(const char *pathname,
-			     struct path *res,
-			     int test(const struct path *path, void *data),
-			     void *data)
-{
-	struct path path;
-	int err;
-
-	err = kern_path_mountpoint(AT_FDCWD, pathname, &path, 0);
-	if (err)
-		return err;
-	err = -ENOENT;
-	while (path.dentry == path.mnt->mnt_root) {
-		if (path.dentry->d_sb->s_magic == AUTOFS_SUPER_MAGIC) {
-			if (test(&path, data)) {
-				path_get(&path);
-				*res = path;
-				err = 0;
-				break;
-			}
-		}
-		if (!follow_up(&path))
-			break;
-	}
-	path_put(&path);
-	return err;
-}
-
-static int test_by_dev(const struct path *path, void *p)
-{
-	return path->dentry->d_sb->s_dev == *(dev_t *)p;
-}
-
-static int test_by_type(const struct path *path, void *p)
-{
-	struct autofs_info *ino = autofs_dentry_ino(path->dentry);
-
-	return ino && ino->sbi->type & *(unsigned *)p;
-}
-
-/*
- * Open a file descriptor on the autofs mount point corresponding
- * to the given path and device number (aka. new_encode_dev(sb->s_dev)).
- */
-static int autofs_dev_ioctl_open_mountpoint(const char *name, dev_t devid)
-{
-	int err, fd;
-
-	fd = get_unused_fd_flags(O_CLOEXEC);
-	if (likely(fd >= 0)) {
-		struct file *filp;
-		struct path path;
-
-		err = find_autofs_mount(name, &path, test_by_dev, &devid);
-		if (err)
-			goto out;
-
-		filp = dentry_open(&path, O_RDONLY, current_cred());
-		path_put(&path);
-		if (IS_ERR(filp)) {
-			err = PTR_ERR(filp);
-			goto out;
-		}
-
-		fd_install(fd, filp);
-	}
-
-	return fd;
-
-out:
-	put_unused_fd(fd);
-	return err;
-}
-
-/* Open a file descriptor on an autofs mount point */
-static int autofs_dev_ioctl_openmount(struct file *fp,
-				      struct autofs_sb_info *sbi,
-				      struct autofs_dev_ioctl *param)
-{
-	const char *path;
-	dev_t devid;
-	int err, fd;
-
-	/* param->path has already been checked */
-	if (!param->openmount.devid)
-		return -EINVAL;
-
-	param->ioctlfd = -1;
-
-	path = param->path;
-	devid = new_decode_dev(param->openmount.devid);
-
-	err = 0;
-	fd = autofs_dev_ioctl_open_mountpoint(path, devid);
-	if (unlikely(fd < 0)) {
-		err = fd;
-		goto out;
-	}
-
-	param->ioctlfd = fd;
-out:
-	return err;
-}
-
-/* Close file descriptor allocated above (user can also use close(2)). */
-static int autofs_dev_ioctl_closemount(struct file *fp,
-				       struct autofs_sb_info *sbi,
-				       struct autofs_dev_ioctl *param)
-{
-	return ksys_close(param->ioctlfd);
-}
-
-/*
- * Send "ready" status for an existing wait (either a mount or an expire
- * request).
- */
-static int autofs_dev_ioctl_ready(struct file *fp,
-				  struct autofs_sb_info *sbi,
-				  struct autofs_dev_ioctl *param)
-{
-	autofs_wqt_t token;
-
-	token = (autofs_wqt_t) param->ready.token;
-	return autofs_wait_release(sbi, token, 0);
-}
-
-/*
- * Send "fail" status for an existing wait (either a mount or an expire
- * request).
- */
-static int autofs_dev_ioctl_fail(struct file *fp,
-				 struct autofs_sb_info *sbi,
-				 struct autofs_dev_ioctl *param)
-{
-	autofs_wqt_t token;
-	int status;
-
-	token = (autofs_wqt_t) param->fail.token;
-	status = param->fail.status < 0 ? param->fail.status : -ENOENT;
-	return autofs_wait_release(sbi, token, status);
-}
-
-/*
- * Set the pipe fd for kernel communication to the daemon.
- *
- * Normally this is set at mount using an option but if we
- * are reconnecting to a busy mount then we need to use this
- * to tell the autofs mount about the new kernel pipe fd. In
- * order to protect mounts against incorrectly setting the
- * pipefd we also require that the autofs mount be catatonic.
- *
- * This also sets the process group id used to identify the
- * controlling process (eg. the owning automount(8) daemon).
- */
-static int autofs_dev_ioctl_setpipefd(struct file *fp,
-				      struct autofs_sb_info *sbi,
-				      struct autofs_dev_ioctl *param)
-{
-	int pipefd;
-	int err = 0;
-	struct pid *new_pid = NULL;
-
-	if (param->setpipefd.pipefd == -1)
-		return -EINVAL;
-
-	pipefd = param->setpipefd.pipefd;
-
-	mutex_lock(&sbi->wq_mutex);
-	if (!sbi->catatonic) {
-		mutex_unlock(&sbi->wq_mutex);
-		return -EBUSY;
-	} else {
-		struct file *pipe;
-
-		new_pid = get_task_pid(current, PIDTYPE_PGID);
-
-		if (ns_of_pid(new_pid) != ns_of_pid(sbi->oz_pgrp)) {
-			pr_warn("not allowed to change PID namespace\n");
-			err = -EINVAL;
-			goto out;
-		}
-
-		pipe = fget(pipefd);
-		if (!pipe) {
-			err = -EBADF;
-			goto out;
-		}
-		if (autofs_prepare_pipe(pipe) < 0) {
-			err = -EPIPE;
-			fput(pipe);
-			goto out;
-		}
-		swap(sbi->oz_pgrp, new_pid);
-		sbi->pipefd = pipefd;
-		sbi->pipe = pipe;
-		sbi->catatonic = 0;
-	}
-out:
-	put_pid(new_pid);
-	mutex_unlock(&sbi->wq_mutex);
-	return err;
-}
-
-/*
- * Make the autofs mount point catatonic, no longer responsive to
- * mount requests. Also closes the kernel pipe file descriptor.
- */
-static int autofs_dev_ioctl_catatonic(struct file *fp,
-				      struct autofs_sb_info *sbi,
-				      struct autofs_dev_ioctl *param)
-{
-	autofs_catatonic_mode(sbi);
-	return 0;
-}
-
-/* Set the autofs mount timeout */
-static int autofs_dev_ioctl_timeout(struct file *fp,
-				    struct autofs_sb_info *sbi,
-				    struct autofs_dev_ioctl *param)
-{
-	unsigned long timeout;
-
-	timeout = param->timeout.timeout;
-	param->timeout.timeout = sbi->exp_timeout / HZ;
-	sbi->exp_timeout = timeout * HZ;
-	return 0;
-}
-
-/*
- * Return the uid and gid of the last request for the mount
- *
- * When reconstructing an autofs mount tree with active mounts
- * we need to re-connect to mounts that may have used the original
- * process uid and gid (or string variations of them) for mount
- * lookups within the map entry.
- */
-static int autofs_dev_ioctl_requester(struct file *fp,
-				      struct autofs_sb_info *sbi,
-				      struct autofs_dev_ioctl *param)
-{
-	struct autofs_info *ino;
-	struct path path;
-	dev_t devid;
-	int err = -ENOENT;
-
-	if (param->size <= AUTOFS_DEV_IOCTL_SIZE) {
-		err = -EINVAL;
-		goto out;
-	}
-
-	devid = sbi->sb->s_dev;
-
-	param->requester.uid = param->requester.gid = -1;
-
-	err = find_autofs_mount(param->path, &path, test_by_dev, &devid);
-	if (err)
-		goto out;
-
-	ino = autofs_dentry_ino(path.dentry);
-	if (ino) {
-		err = 0;
-		autofs_expire_wait(&path, 0);
-		spin_lock(&sbi->fs_lock);
-		param->requester.uid =
-			from_kuid_munged(current_user_ns(), ino->uid);
-		param->requester.gid =
-			from_kgid_munged(current_user_ns(), ino->gid);
-		spin_unlock(&sbi->fs_lock);
-	}
-	path_put(&path);
-out:
-	return err;
-}
-
-/*
- * Call repeatedly until it returns -EAGAIN, meaning there's nothing
- * more that can be done.
- */
-static int autofs_dev_ioctl_expire(struct file *fp,
-				   struct autofs_sb_info *sbi,
-				   struct autofs_dev_ioctl *param)
-{
-	struct vfsmount *mnt;
-	int how;
-
-	how = param->expire.how;
-	mnt = fp->f_path.mnt;
-
-	return autofs_do_expire_multi(sbi->sb, mnt, sbi, how);
-}
-
-/* Check if autofs mount point is in use */
-static int autofs_dev_ioctl_askumount(struct file *fp,
-				      struct autofs_sb_info *sbi,
-				      struct autofs_dev_ioctl *param)
-{
-	param->askumount.may_umount = 0;
-	if (may_umount(fp->f_path.mnt))
-		param->askumount.may_umount = 1;
-	return 0;
-}
-
-/*
- * Check if the given path is a mountpoint.
- *
- * If we are supplied with the file descriptor of an autofs
- * mount we're looking for a specific mount. In this case
- * the path is considered a mountpoint if it is itself a
- * mountpoint or contains a mount, such as a multi-mount
- * without a root mount. In this case we return 1 if the
- * path is a mount point and the super magic of the covering
- * mount if there is one or 0 if it isn't a mountpoint.
- *
- * If we aren't supplied with a file descriptor then we
- * lookup the path and check if it is the root of a mount.
- * If a type is given we are looking for a particular autofs
- * mount and if we don't find a match we return fail. If the
- * located path is the root of a mount we return 1 along with
- * the super magic of the mount or 0 otherwise.
- *
- * In both cases the the device number (as returned by
- * new_encode_dev()) is also returned.
- */
-static int autofs_dev_ioctl_ismountpoint(struct file *fp,
-					 struct autofs_sb_info *sbi,
-					 struct autofs_dev_ioctl *param)
-{
-	struct path path;
-	const char *name;
-	unsigned int type;
-	unsigned int devid, magic;
-	int err = -ENOENT;
-
-	if (param->size <= AUTOFS_DEV_IOCTL_SIZE) {
-		err = -EINVAL;
-		goto out;
-	}
-
-	name = param->path;
-	type = param->ismountpoint.in.type;
-
-	param->ismountpoint.out.devid = devid = 0;
-	param->ismountpoint.out.magic = magic = 0;
-
-	if (!fp || param->ioctlfd == -1) {
-		if (autofs_type_any(type))
-			err = kern_path_mountpoint(AT_FDCWD,
-						   name, &path, LOOKUP_FOLLOW);
-		else
-			err = find_autofs_mount(name, &path,
-						test_by_type, &type);
-		if (err)
-			goto out;
-		devid = new_encode_dev(path.dentry->d_sb->s_dev);
-		err = 0;
-		if (path.mnt->mnt_root == path.dentry) {
-			err = 1;
-			magic = path.dentry->d_sb->s_magic;
-		}
-	} else {
-		dev_t dev = sbi->sb->s_dev;
-
-		err = find_autofs_mount(name, &path, test_by_dev, &dev);
-		if (err)
-			goto out;
-
-		devid = new_encode_dev(dev);
-
-		err = path_has_submounts(&path);
-
-		if (follow_down_one(&path))
-			magic = path.dentry->d_sb->s_magic;
-	}
-
-	param->ismountpoint.out.devid = devid;
-	param->ismountpoint.out.magic = magic;
-	path_put(&path);
-out:
-	return err;
-}
-
-/*
- * Our range of ioctl numbers isn't 0 based so we need to shift
- * the array index by _IOC_NR(AUTOFS_CTL_IOC_FIRST) for the table
- * lookup.
- */
-#define cmd_idx(cmd)	(cmd - _IOC_NR(AUTOFS_DEV_IOCTL_IOC_FIRST))
-
-static ioctl_fn lookup_dev_ioctl(unsigned int cmd)
-{
-	static ioctl_fn _ioctls[] = {
-		autofs_dev_ioctl_version,
-		autofs_dev_ioctl_protover,
-		autofs_dev_ioctl_protosubver,
-		autofs_dev_ioctl_openmount,
-		autofs_dev_ioctl_closemount,
-		autofs_dev_ioctl_ready,
-		autofs_dev_ioctl_fail,
-		autofs_dev_ioctl_setpipefd,
-		autofs_dev_ioctl_catatonic,
-		autofs_dev_ioctl_timeout,
-		autofs_dev_ioctl_requester,
-		autofs_dev_ioctl_expire,
-		autofs_dev_ioctl_askumount,
-		autofs_dev_ioctl_ismountpoint,
-	};
-	unsigned int idx = cmd_idx(cmd);
-
-	return (idx >= ARRAY_SIZE(_ioctls)) ? NULL : _ioctls[idx];
-}
-
-/* ioctl dispatcher */
-static int _autofs_dev_ioctl(unsigned int command,
-			     struct autofs_dev_ioctl __user *user)
-{
-	struct autofs_dev_ioctl *param;
-	struct file *fp;
-	struct autofs_sb_info *sbi;
-	unsigned int cmd_first, cmd;
-	ioctl_fn fn = NULL;
-	int err = 0;
-
-	cmd_first = _IOC_NR(AUTOFS_DEV_IOCTL_IOC_FIRST);
-	cmd = _IOC_NR(command);
-
-	if (_IOC_TYPE(command) != _IOC_TYPE(AUTOFS_DEV_IOCTL_IOC_FIRST) ||
-	    cmd - cmd_first > AUTOFS_DEV_IOCTL_IOC_COUNT) {
-		return -ENOTTY;
-	}
-
-	/* Only root can use ioctls other than AUTOFS_DEV_IOCTL_VERSION_CMD
-	 * and AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD
-	 */
-	if (cmd != AUTOFS_DEV_IOCTL_VERSION_CMD &&
-	    cmd != AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD &&
-	    !capable(CAP_SYS_ADMIN))
-		return -EPERM;
-
-	/* Copy the parameters into kernel space. */
-	param = copy_dev_ioctl(user);
-	if (IS_ERR(param))
-		return PTR_ERR(param);
-
-	err = validate_dev_ioctl(command, param);
-	if (err)
-		goto out;
-
-	fn = lookup_dev_ioctl(cmd);
-	if (!fn) {
-		pr_warn("unknown command 0x%08x\n", command);
-		err = -ENOTTY;
-		goto out;
-	}
-
-	fp = NULL;
-	sbi = NULL;
-
-	/*
-	 * For obvious reasons the openmount can't have a file
-	 * descriptor yet. We don't take a reference to the
-	 * file during close to allow for immediate release,
-	 * and the same for retrieving ioctl version.
-	 */
-	if (cmd != AUTOFS_DEV_IOCTL_VERSION_CMD &&
-	    cmd != AUTOFS_DEV_IOCTL_OPENMOUNT_CMD &&
-	    cmd != AUTOFS_DEV_IOCTL_CLOSEMOUNT_CMD) {
-		fp = fget(param->ioctlfd);
-		if (!fp) {
-			if (cmd == AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD)
-				goto cont;
-			err = -EBADF;
-			goto out;
-		}
-
-		sbi = autofs_dev_ioctl_sbi(fp);
-		if (!sbi || sbi->magic != AUTOFS_SBI_MAGIC) {
-			err = -EINVAL;
-			fput(fp);
-			goto out;
-		}
-
-		/*
-		 * Admin needs to be able to set the mount catatonic in
-		 * order to be able to perform the re-open.
-		 */
-		if (!autofs_oz_mode(sbi) &&
-		    cmd != AUTOFS_DEV_IOCTL_CATATONIC_CMD) {
-			err = -EACCES;
-			fput(fp);
-			goto out;
-		}
-	}
-cont:
-	err = fn(fp, sbi, param);
-
-	if (fp)
-		fput(fp);
-	if (err >= 0 && copy_to_user(user, param, AUTOFS_DEV_IOCTL_SIZE))
-		err = -EFAULT;
-out:
-	free_dev_ioctl(param);
-	return err;
-}
-
-static long autofs_dev_ioctl(struct file *file, unsigned int command,
-			     unsigned long u)
-{
-	int err;
-
-	err = _autofs_dev_ioctl(command, (struct autofs_dev_ioctl __user *) u);
-	return (long) err;
-}
-
-#ifdef CONFIG_COMPAT
-static long autofs_dev_ioctl_compat(struct file *file, unsigned int command,
-				    unsigned long u)
-{
-	return autofs_dev_ioctl(file, command, (unsigned long) compat_ptr(u));
-}
-#else
-#define autofs_dev_ioctl_compat NULL
-#endif
-
-static const struct file_operations _dev_ioctl_fops = {
-	.unlocked_ioctl	 = autofs_dev_ioctl,
-	.compat_ioctl = autofs_dev_ioctl_compat,
-	.owner	 = THIS_MODULE,
-	.llseek = noop_llseek,
-};
-
-static struct miscdevice _autofs_dev_ioctl_misc = {
-	.minor		= AUTOFS_MINOR,
-	.name		= AUTOFS_DEVICE_NAME,
-	.fops		= &_dev_ioctl_fops,
-	.mode           = 0644,
-};
-
-MODULE_ALIAS_MISCDEV(AUTOFS_MINOR);
-MODULE_ALIAS("devname:autofs");
-
-/* Register/deregister misc character device */
-int __init autofs_dev_ioctl_init(void)
-{
-	int r;
-
-	r = misc_register(&_autofs_dev_ioctl_misc);
-	if (r) {
-		pr_err("misc_register failed for control device\n");
-		return r;
-	}
-
-	return 0;
-}
-
-void autofs_dev_ioctl_exit(void)
-{
-	misc_deregister(&_autofs_dev_ioctl_misc);
-}