1 files changed, 760 insertions, 0 deletions

diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
new file mode 100644
index 000000000000..25a3b4dfcf61
--- /dev/null
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -0,0 +1,760 @@
+#include <linux/fanotify.h>
+#include <linux/fcntl.h>
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/anon_inodes.h>
+#include <linux/fsnotify_backend.h>
+#include <linux/init.h>
+#include <linux/mount.h>
+#include <linux/namei.h>
+#include <linux/poll.h>
+#include <linux/security.h>
+#include <linux/syscalls.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/uaccess.h>
+
+#include <asm/ioctls.h>
+
+extern const struct fsnotify_ops fanotify_fsnotify_ops;
+
+static struct kmem_cache *fanotify_mark_cache __read_mostly;
+static struct kmem_cache *fanotify_response_event_cache __read_mostly;
+
+struct fanotify_response_event {
+        struct list_head list;
+        __s32 fd;
+        struct fsnotify_event *event;
+};
+
+/*
+ * Get an fsnotify notification event if one exists and is small
+ * enough to fit in "count". Return an error pointer if the count
+ * is not large enough.
+ *
+ * Called with the group->notification_mutex held.
+ */
+static struct fsnotify_event *get_one_event(struct fsnotify_group *group,
+                                            size_t count)
+{
+        BUG_ON(!mutex_is_locked(&group->notification_mutex));
+
+        pr_debug("%s: group=%p count=%zd\n", __func__, group, count);
+
+        if (fsnotify_notify_queue_is_empty(group))
+                return NULL;
+
+        if (FAN_EVENT_METADATA_LEN > count)
+                return ERR_PTR(-EINVAL);
+
+        /* held the notification_mutex the whole time, so this is the
+         * same event we peeked above */
+        return fsnotify_remove_notify_event(group);
+}
+
+static int create_fd(struct fsnotify_group *group, struct fsnotify_event *event)
+{
+        int client_fd;
+        struct dentry *dentry;
+        struct vfsmount *mnt;
+        struct file *new_file;
+
+        pr_debug("%s: group=%p event=%p\n", __func__, group, event);
+
+        client_fd = get_unused_fd();
+        if (client_fd < 0)
+                return client_fd;
+
+        if (event->data_type != FSNOTIFY_EVENT_FILE) {
+                WARN_ON(1);
+                put_unused_fd(client_fd);
+                return -EINVAL;
+        }
+
+        /*
+         * we need a new file handle for the userspace program so it can read even if it was
+         * originally opened O_WRONLY.
+         */
+        dentry = dget(event->file->f_path.dentry);
+        mnt = mntget(event->file->f_path.mnt);
+        /* it's possible this event was an overflow event.  in that case dentry and mnt
+         * are NULL;  That's fine, just don't call dentry open */
+        if (dentry && mnt)
+                new_file = dentry_open(dentry, mnt,
+                                       group->fanotify_data.f_flags | FMODE_NONOTIFY,
+                                       current_cred());
+        else
+                new_file = ERR_PTR(-EOVERFLOW);
+        if (IS_ERR(new_file)) {
+                /*
+                 * we still send an event even if we can't open the file.  this
+                 * can happen when say tasks are gone and we try to open their
+                 * /proc files or we try to open a WRONLY file like in sysfs
+                 * we just send the errno to userspace since there isn't much
+                 * else we can do.
+                 */
+                put_unused_fd(client_fd);
+                client_fd = PTR_ERR(new_file);
+        } else {
+                fd_install(client_fd, new_file);
+        }
+
+        return client_fd;
+}
+
+static ssize_t fill_event_metadata(struct fsnotify_group *group,
+                                   struct fanotify_event_metadata *metadata,
+                                   struct fsnotify_event *event)
+{
+        pr_debug("%s: group=%p metadata=%p event=%p\n", __func__,
+                 group, metadata, event);
+
+        metadata->event_len = FAN_EVENT_METADATA_LEN;
+        metadata->vers = FANOTIFY_METADATA_VERSION;
+        metadata->mask = event->mask & FAN_ALL_OUTGOING_EVENTS;
+        metadata->pid = pid_vnr(event->tgid);
+        metadata->fd = create_fd(group, event);
+
+        return metadata->fd;
+}
+
+#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
+static struct fanotify_response_event *dequeue_re(struct fsnotify_group *group,
+                                                  __s32 fd)
+{
+        struct fanotify_response_event *re, *return_re = NULL;
+
+        mutex_lock(&group->fanotify_data.access_mutex);
+        list_for_each_entry(re, &group->fanotify_data.access_list, list) {
+                if (re->fd != fd)
+                        continue;
+
+                list_del_init(&re->list);
+                return_re = re;
+                break;
+        }
+        mutex_unlock(&group->fanotify_data.access_mutex);
+
+        pr_debug("%s: found return_re=%p\n", __func__, return_re);
+
+        return return_re;
+}
+
+static int process_access_response(struct fsnotify_group *group,
+                                   struct fanotify_response *response_struct)
+{
+        struct fanotify_response_event *re;
+        __s32 fd = response_struct->fd;
+        __u32 response = response_struct->response;
+
+        pr_debug("%s: group=%p fd=%d response=%d\n", __func__, group,
+                 fd, response);
+        /*
+         * make sure the response is valid, if invalid we do nothing and either
+         * userspace can send a valid responce or we will clean it up after the
+         * timeout
+         */
+        switch (response) {
+        case FAN_ALLOW:
+        case FAN_DENY:
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        if (fd < 0)
+                return -EINVAL;
+
+        re = dequeue_re(group, fd);
+        if (!re)
+                return -ENOENT;
+
+        re->event->response = response;
+
+        wake_up(&group->fanotify_data.access_waitq);
+
+        kmem_cache_free(fanotify_response_event_cache, re);
+
+        return 0;
+}
+
+static int prepare_for_access_response(struct fsnotify_group *group,
+                                       struct fsnotify_event *event,
+                                       __s32 fd)
+{
+        struct fanotify_response_event *re;
+
+        if (!(event->mask & FAN_ALL_PERM_EVENTS))
+                return 0;
+
+        re = kmem_cache_alloc(fanotify_response_event_cache, GFP_KERNEL);
+        if (!re)
+                return -ENOMEM;
+
+        re->event = event;
+        re->fd = fd;
+
+        mutex_lock(&group->fanotify_data.access_mutex);
+        list_add_tail(&re->list, &group->fanotify_data.access_list);
+        mutex_unlock(&group->fanotify_data.access_mutex);
+
+        return 0;
+}
+
+static void remove_access_response(struct fsnotify_group *group,
+                                   struct fsnotify_event *event,
+                                   __s32 fd)
+{
+        struct fanotify_response_event *re;
+
+        if (!(event->mask & FAN_ALL_PERM_EVENTS))
+                return;
+
+        re = dequeue_re(group, fd);
+        if (!re)
+                return;
+
+        BUG_ON(re->event != event);
+
+        kmem_cache_free(fanotify_response_event_cache, re);
+
+        return;
+}
+#else
+static int prepare_for_access_response(struct fsnotify_group *group,
+                                       struct fsnotify_event *event,
+                                       __s32 fd)
+{
+        return 0;
+}
+
+static void remove_access_response(struct fsnotify_group *group,
+                                   struct fsnotify_event *event,
+                                   __s32 fd)
+{
+        return;
+}
+#endif
+
+static ssize_t copy_event_to_user(struct fsnotify_group *group,
+                                  struct fsnotify_event *event,
+                                  char __user *buf)
+{
+        struct fanotify_event_metadata fanotify_event_metadata;
+        int fd, ret;
+
+        pr_debug("%s: group=%p event=%p\n", __func__, group, event);
+
+        fd = fill_event_metadata(group, &fanotify_event_metadata, event);
+        if (fd < 0)
+                return fd;
+
+        ret = prepare_for_access_response(group, event, fd);
+        if (ret)
+                goto out_close_fd;
+
+        ret = -EFAULT;
+        if (copy_to_user(buf, &fanotify_event_metadata, FAN_EVENT_METADATA_LEN))
+                goto out_kill_access_response;
+
+        return FAN_EVENT_METADATA_LEN;
+
+out_kill_access_response:
+        remove_access_response(group, event, fd);
+out_close_fd:
+        sys_close(fd);
+        return ret;
+}
+
+/* intofiy userspace file descriptor functions */
+static unsigned int fanotify_poll(struct file *file, poll_table *wait)
+{
+        struct fsnotify_group *group = file->private_data;
+        int ret = 0;
+
+        poll_wait(file, &group->notification_waitq, wait);
+        mutex_lock(&group->notification_mutex);
+        if (!fsnotify_notify_queue_is_empty(group))
+                ret = POLLIN | POLLRDNORM;
+        mutex_unlock(&group->notification_mutex);
+
+        return ret;
+}
+
+static ssize_t fanotify_read(struct file *file, char __user *buf,
+                             size_t count, loff_t *pos)
+{
+        struct fsnotify_group *group;
+        struct fsnotify_event *kevent;
+        char __user *start;
+        int ret;
+        DEFINE_WAIT(wait);
+
+        start = buf;
+        group = file->private_data;
+
+        pr_debug("%s: group=%p\n", __func__, group);
+
+        while (1) {
+                prepare_to_wait(&group->notification_waitq, &wait, TASK_INTERRUPTIBLE);
+
+                mutex_lock(&group->notification_mutex);
+                kevent = get_one_event(group, count);
+                mutex_unlock(&group->notification_mutex);
+
+                if (kevent) {
+                        ret = PTR_ERR(kevent);
+                        if (IS_ERR(kevent))
+                                break;
+                        ret = copy_event_to_user(group, kevent, buf);
+                        fsnotify_put_event(kevent);
+                        if (ret < 0)
+                                break;
+                        buf += ret;
+                        count -= ret;
+                        continue;
+                }
+
+                ret = -EAGAIN;
+                if (file->f_flags & O_NONBLOCK)
+                        break;
+                ret = -EINTR;
+                if (signal_pending(current))
+                        break;
+
+                if (start != buf)
+                        break;
+
+                schedule();
+        }
+
+        finish_wait(&group->notification_waitq, &wait);
+        if (start != buf && ret != -EFAULT)
+                ret = buf - start;
+        return ret;
+}
+
+static ssize_t fanotify_write(struct file *file, const char __user *buf, size_t count, loff_t *pos)
+{
+#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
+        struct fanotify_response response = { .fd = -1, .response = -1 };
+        struct fsnotify_group *group;
+        int ret;
+
+        group = file->private_data;
+
+        if (count > sizeof(response))
+                count = sizeof(response);
+
+        pr_debug("%s: group=%p count=%zu\n", __func__, group, count);
+
+        if (copy_from_user(&response, buf, count))
+                return -EFAULT;
+
+        ret = process_access_response(group, &response);
+        if (ret < 0)
+                count = ret;
+
+        return count;
+#else
+        return -EINVAL;
+#endif
+}
+
+static int fanotify_release(struct inode *ignored, struct file *file)
+{
+        struct fsnotify_group *group = file->private_data;
+
+        pr_debug("%s: file=%p group=%p\n", __func__, file, group);
+
+        /* matches the fanotify_init->fsnotify_alloc_group */
+        fsnotify_put_group(group);
+
+        return 0;
+}
+
+static long fanotify_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+        struct fsnotify_group *group;
+        struct fsnotify_event_holder *holder;
+        void __user *p;
+        int ret = -ENOTTY;
+        size_t send_len = 0;
+
+        group = file->private_data;
+
+        p = (void __user *) arg;
+
+        switch (cmd) {
+        case FIONREAD:
+                mutex_lock(&group->notification_mutex);
+                list_for_each_entry(holder, &group->notification_list, event_list)
+                        send_len += FAN_EVENT_METADATA_LEN;
+                mutex_unlock(&group->notification_mutex);
+                ret = put_user(send_len, (int __user *) p);
+                break;
+        }
+
+        return ret;
+}
+
+static const struct file_operations fanotify_fops = {
+        .poll           = fanotify_poll,
+        .read           = fanotify_read,
+        .write          = fanotify_write,
+        .fasync         = NULL,
+        .release        = fanotify_release,
+        .unlocked_ioctl = fanotify_ioctl,
+        .compat_ioctl   = fanotify_ioctl,
+};
+
+static void fanotify_free_mark(struct fsnotify_mark *fsn_mark)
+{
+        kmem_cache_free(fanotify_mark_cache, fsn_mark);
+}
+
+static int fanotify_find_path(int dfd, const char __user *filename,
+                              struct path *path, unsigned int flags)
+{
+        int ret;
+
+        pr_debug("%s: dfd=%d filename=%p flags=%x\n", __func__,
+                 dfd, filename, flags);
+
+        if (filename == NULL) {
+                struct file *file;
+                int fput_needed;
+
+                ret = -EBADF;
+                file = fget_light(dfd, &fput_needed);
+                if (!file)
+                        goto out;
+
+                ret = -ENOTDIR;
+                if ((flags & FAN_MARK_ONLYDIR) &&
+                    !(S_ISDIR(file->f_path.dentry->d_inode->i_mode))) {
+                        fput_light(file, fput_needed);
+                        goto out;
+                }
+
+                *path = file->f_path;
+                path_get(path);
+                fput_light(file, fput_needed);
+        } else {
+                unsigned int lookup_flags = 0;
+
+                if (!(flags & FAN_MARK_DONT_FOLLOW))
+                        lookup_flags |= LOOKUP_FOLLOW;
+                if (flags & FAN_MARK_ONLYDIR)
+                        lookup_flags |= LOOKUP_DIRECTORY;
+
+                ret = user_path_at(dfd, filename, lookup_flags, path);
+                if (ret)
+                        goto out;
+        }
+
+        /* you can only watch an inode if you have read permissions on it */
+        ret = inode_permission(path->dentry->d_inode, MAY_READ);
+        if (ret)
+                path_put(path);
+out:
+        return ret;
+}
+
+static __u32 fanotify_mark_remove_from_mask(struct fsnotify_mark *fsn_mark,
+                                            __u32 mask,
+                                            unsigned int flags)
+{
+        __u32 oldmask;
+
+        spin_lock(&fsn_mark->lock);
+        if (!(flags & FAN_MARK_IGNORED_MASK)) {
+                oldmask = fsn_mark->mask;
+                fsnotify_set_mark_mask_locked(fsn_mark, (oldmask & ~mask));
+        } else {
+                oldmask = fsn_mark->ignored_mask;
+                fsnotify_set_mark_ignored_mask_locked(fsn_mark, (oldmask & ~mask));
+        }
+        spin_unlock(&fsn_mark->lock);
+
+        if (!(oldmask & ~mask))
+                fsnotify_destroy_mark(fsn_mark);
+
+        return mask & oldmask;
+}
+
+static int fanotify_remove_vfsmount_mark(struct fsnotify_group *group,
+                                         struct vfsmount *mnt, __u32 mask,
+                                         unsigned int flags)
+{
+        struct fsnotify_mark *fsn_mark = NULL;
+        __u32 removed;
+
+        fsn_mark = fsnotify_find_vfsmount_mark(group, mnt);
+        if (!fsn_mark)
+                return -ENOENT;
+
+        removed = fanotify_mark_remove_from_mask(fsn_mark, mask, flags);
+        fsnotify_put_mark(fsn_mark);
+        if (removed & mnt->mnt_fsnotify_mask)
+                fsnotify_recalc_vfsmount_mask(mnt);
+
+        return 0;
+}
+
+static int fanotify_remove_inode_mark(struct fsnotify_group *group,
+                                      struct inode *inode, __u32 mask,
+                                      unsigned int flags)
+{
+        struct fsnotify_mark *fsn_mark = NULL;
+        __u32 removed;
+
+        fsn_mark = fsnotify_find_inode_mark(group, inode);
+        if (!fsn_mark)
+                return -ENOENT;
+
+        removed = fanotify_mark_remove_from_mask(fsn_mark, mask, flags);
+        /* matches the fsnotify_find_inode_mark() */
+        fsnotify_put_mark(fsn_mark);
+        if (removed & inode->i_fsnotify_mask)
+                fsnotify_recalc_inode_mask(inode);
+
+        return 0;
+}
+
+static __u32 fanotify_mark_add_to_mask(struct fsnotify_mark *fsn_mark,
+                                       __u32 mask,
+                                       unsigned int flags)
+{
+        __u32 oldmask;
+
+        spin_lock(&fsn_mark->lock);
+        if (!(flags & FAN_MARK_IGNORED_MASK)) {
+                oldmask = fsn_mark->mask;
+                fsnotify_set_mark_mask_locked(fsn_mark, (oldmask | mask));
+        } else {
+                oldmask = fsn_mark->ignored_mask;
+                fsnotify_set_mark_ignored_mask_locked(fsn_mark, (oldmask | mask));
+                if (flags & FAN_MARK_IGNORED_SURV_MODIFY)
+                        fsn_mark->flags |= FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY;
+        }
+        spin_unlock(&fsn_mark->lock);
+
+        return mask & ~oldmask;
+}
+
+static int fanotify_add_vfsmount_mark(struct fsnotify_group *group,
+                                      struct vfsmount *mnt, __u32 mask,
+                                      unsigned int flags)
+{
+        struct fsnotify_mark *fsn_mark;
+        __u32 added;
+
+        fsn_mark = fsnotify_find_vfsmount_mark(group, mnt);
+        if (!fsn_mark) {
+                int ret;
+
+                fsn_mark = kmem_cache_alloc(fanotify_mark_cache, GFP_KERNEL);
+                if (!fsn_mark)
+                        return -ENOMEM;
+
+                fsnotify_init_mark(fsn_mark, fanotify_free_mark);
+                ret = fsnotify_add_mark(fsn_mark, group, NULL, mnt, 0);
+                if (ret) {
+                        fanotify_free_mark(fsn_mark);
+                        return ret;
+                }
+        }
+        added = fanotify_mark_add_to_mask(fsn_mark, mask, flags);
+        fsnotify_put_mark(fsn_mark);
+        if (added & ~mnt->mnt_fsnotify_mask)
+                fsnotify_recalc_vfsmount_mask(mnt);
+
+        return 0;
+}
+
+static int fanotify_add_inode_mark(struct fsnotify_group *group,
+                                   struct inode *inode, __u32 mask,
+                                   unsigned int flags)
+{
+        struct fsnotify_mark *fsn_mark;
+        __u32 added;
+
+        pr_debug("%s: group=%p inode=%p\n", __func__, group, inode);
+
+        fsn_mark = fsnotify_find_inode_mark(group, inode);
+        if (!fsn_mark) {
+                int ret;
+
+                fsn_mark = kmem_cache_alloc(fanotify_mark_cache, GFP_KERNEL);
+                if (!fsn_mark)
+                        return -ENOMEM;
+
+                fsnotify_init_mark(fsn_mark, fanotify_free_mark);
+                ret = fsnotify_add_mark(fsn_mark, group, inode, NULL, 0);
+                if (ret) {
+                        fanotify_free_mark(fsn_mark);
+                        return ret;
+                }
+        }
+        added = fanotify_mark_add_to_mask(fsn_mark, mask, flags);
+        fsnotify_put_mark(fsn_mark);
+        if (added & ~inode->i_fsnotify_mask)
+                fsnotify_recalc_inode_mask(inode);
+        return 0;
+}
+
+/* fanotify syscalls */
+SYSCALL_DEFINE2(fanotify_init, unsigned int, flags, unsigned int, event_f_flags)
+{
+        struct fsnotify_group *group;
+        int f_flags, fd;
+
+        pr_debug("%s: flags=%d event_f_flags=%d\n",
+                __func__, flags, event_f_flags);
+
+        if (!capable(CAP_SYS_ADMIN))
+                return -EACCES;
+
+        if (flags & ~FAN_ALL_INIT_FLAGS)
+                return -EINVAL;
+
+        f_flags = O_RDWR | FMODE_NONOTIFY;
+        if (flags & FAN_CLOEXEC)
+                f_flags |= O_CLOEXEC;
+        if (flags & FAN_NONBLOCK)
+                f_flags |= O_NONBLOCK;
+
+        /* fsnotify_alloc_group takes a ref.  Dropped in fanotify_release */
+        group = fsnotify_alloc_group(&fanotify_fsnotify_ops);
+        if (IS_ERR(group))
+                return PTR_ERR(group);
+
+        group->fanotify_data.f_flags = event_f_flags;
+#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
+        mutex_init(&group->fanotify_data.access_mutex);
+        init_waitqueue_head(&group->fanotify_data.access_waitq);
+        INIT_LIST_HEAD(&group->fanotify_data.access_list);
+#endif
+
+        fd = anon_inode_getfd("[fanotify]", &fanotify_fops, group, f_flags);
+        if (fd < 0)
+                goto out_put_group;
+
+        return fd;
+
+out_put_group:
+        fsnotify_put_group(group);
+        return fd;
+}
+
+SYSCALL_DEFINE(fanotify_mark)(int fanotify_fd, unsigned int flags,
+                              __u64 mask, int dfd,
+                              const char  __user * pathname)
+{
+        struct inode *inode = NULL;
+        struct vfsmount *mnt = NULL;
+        struct fsnotify_group *group;
+        struct file *filp;
+        struct path path;
+        int ret, fput_needed;
+
+        pr_debug("%s: fanotify_fd=%d flags=%x dfd=%d pathname=%p mask=%llx\n",
+                 __func__, fanotify_fd, flags, dfd, pathname, mask);
+
+        /* we only use the lower 32 bits as of right now. */
+        if (mask & ((__u64)0xffffffff << 32))
+                return -EINVAL;
+
+        if (flags & ~FAN_ALL_MARK_FLAGS)
+                return -EINVAL;
+        switch (flags & (FAN_MARK_ADD | FAN_MARK_REMOVE | FAN_MARK_FLUSH)) {
+        case FAN_MARK_ADD:
+        case FAN_MARK_REMOVE:
+        case FAN_MARK_FLUSH:
+                break;
+        default:
+                return -EINVAL;
+        }
+#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
+        if (mask & ~(FAN_ALL_EVENTS | FAN_ALL_PERM_EVENTS | FAN_EVENT_ON_CHILD))
+#else
+        if (mask & ~(FAN_ALL_EVENTS | FAN_EVENT_ON_CHILD))
+#endif
+                return -EINVAL;
+
+        filp = fget_light(fanotify_fd, &fput_needed);
+        if (unlikely(!filp))
+                return -EBADF;
+
+        /* verify that this is indeed an fanotify instance */
+        ret = -EINVAL;
+        if (unlikely(filp->f_op != &fanotify_fops))
+                goto fput_and_out;
+
+        ret = fanotify_find_path(dfd, pathname, &path, flags);
+        if (ret)
+                goto fput_and_out;
+
+        /* inode held in place by reference to path; group by fget on fd */
+        if (!(flags & FAN_MARK_MOUNT))
+                inode = path.dentry->d_inode;
+        else
+                mnt = path.mnt;
+        group = filp->private_data;
+
+        /* create/update an inode mark */
+        switch (flags & (FAN_MARK_ADD | FAN_MARK_REMOVE | FAN_MARK_FLUSH)) {
+        case FAN_MARK_ADD:
+                if (flags & FAN_MARK_MOUNT)
+                        ret = fanotify_add_vfsmount_mark(group, mnt, mask, flags);
+                else
+                        ret = fanotify_add_inode_mark(group, inode, mask, flags);
+                break;
+        case FAN_MARK_REMOVE:
+                if (flags & FAN_MARK_MOUNT)
+                        ret = fanotify_remove_vfsmount_mark(group, mnt, mask, flags);
+                else
+                        ret = fanotify_remove_inode_mark(group, inode, mask, flags);
+                break;
+        case FAN_MARK_FLUSH:
+                if (flags & FAN_MARK_MOUNT)
+                        fsnotify_clear_vfsmount_marks_by_group(group);
+                else
+                        fsnotify_clear_inode_marks_by_group(group);
+                break;
+        default:
+                ret = -EINVAL;
+        }
+
+        path_put(&path);
+fput_and_out:
+        fput_light(filp, fput_needed);
+        return ret;
+}
+
+#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
+asmlinkage long SyS_fanotify_mark(long fanotify_fd, long flags, __u64 mask,
+                                  long dfd, long pathname)
+{
+        return SYSC_fanotify_mark((int) fanotify_fd, (unsigned int) flags,
+                                  mask, (int) dfd,
+                                  (const char  __user *) pathname);
+}
+SYSCALL_ALIAS(sys_fanotify_mark, SyS_fanotify_mark);
+#endif
+
+/*
+ * fanotify_user_setup - Our initialization function.  Note that we cannnot return
+ * error because we have compiled-in VFS hooks.  So an (unlikely) failure here
+ * must result in panic().
+ */
+static int __init fanotify_user_setup(void)
+{
+        fanotify_mark_cache = KMEM_CACHE(fsnotify_mark, SLAB_PANIC);
+        fanotify_response_event_cache = KMEM_CACHE(fanotify_response_event,
+                                                   SLAB_PANIC);
+
+        return 0;
+}
+device_initcall(fanotify_user_setup);