Commit d0de4dc5 authored by Eric Paris's avatar Eric Paris Committed by Linus Torvalds
Browse files

inotify: fix double free/corruption of stuct user 



On an error path in inotify_init1 a normal user can trigger a double
free of struct user.  This is a regression introduced by a2ae4cc9
("inotify: stop kernel memory leak on file creation failure").

We fix this by making sure that if a group exists the user reference is
dropped when the group is cleaned up.  We should not explictly drop the
reference on error and also drop the reference when the group is cleaned
up.

The new lifetime rules are that an inotify group lives from
inotify_new_group to the last fsnotify_put_group.  Since the struct user
and inotify_devs are directly tied to this lifetime they are only
changed/updated in those two locations.  We get rid of all special
casing of struct user or user->inotify_devs.

Signed-off-by: default avatarEric Paris <eparis@redhat.com>
Cc: stable@kernel.org (2.6.37 and up)
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 623dda65

fs/notify/inotify/inotify_fsnotify.c

+1 −0
Original line number Diff line number Diff line
@@ -198,6 +198,7 @@ static void inotify_free_group_priv(struct fsnotify_group *group) 
	idr_for_each(&group->inotify_data.idr, idr_callback, group);

	idr_remove_all(&group->inotify_data.idr);

	idr_destroy(&group->inotify_data.idr);

	atomic_dec(&group->inotify_data.user->inotify_devs);

	free_uid(group->inotify_data.user);

}

fs/notify/inotify/inotify_user.c

+13 −26
Original line number Diff line number Diff line
@@ -290,7 +290,6 @@ static int inotify_fasync(int fd, struct file *file, int on) 
static int inotify_release(struct inode *ignored, struct file *file)

{

	struct fsnotify_group *group = file->private_data;

	struct user_struct *user = group->inotify_data.user;



	pr_debug("%s: group=%p\n", __func__, group);
@@ -299,8 +298,6 @@ static int inotify_release(struct inode *ignored, struct file *file) 
	/* free this group, matching get was inotify_init->fsnotify_obtain_group */

	fsnotify_put_group(group);



	atomic_dec(&user->inotify_devs);



	return 0;

}
@@ -697,7 +694,7 @@ retry: 
	return ret;

}



static struct fsnotify_group *inotify_new_group(struct user_struct *user, unsigned int max_events)

static struct fsnotify_group *inotify_new_group(unsigned int max_events)

{

	struct fsnotify_group *group;
@@ -710,8 +707,14 @@ static struct fsnotify_group *inotify_new_group(struct user_struct *user, unsign 
	spin_lock_init(&group->inotify_data.idr_lock);

	idr_init(&group->inotify_data.idr);

	group->inotify_data.last_wd = 0;

	group->inotify_data.user = user;

	group->inotify_data.fa = NULL;

	group->inotify_data.user = get_current_user();



	if (atomic_inc_return(&group->inotify_data.user->inotify_devs) >

	    inotify_max_user_instances) {

		fsnotify_put_group(group);

		return ERR_PTR(-EMFILE);

	}



	return group;

}
@@ -721,7 +724,6 @@ static struct fsnotify_group *inotify_new_group(struct user_struct *user, unsign 
SYSCALL_DEFINE1(inotify_init1, int, flags)

{

	struct fsnotify_group *group;

	struct user_struct *user;

	int ret;



	/* Check the IN_* constants for consistency.  */
@@ -731,31 +733,16 @@ SYSCALL_DEFINE1(inotify_init1, int, flags) 
	if (flags & ~(IN_CLOEXEC | IN_NONBLOCK))

		return -EINVAL;



	user = get_current_user();

	if (unlikely(atomic_read(&user->inotify_devs) >=

			inotify_max_user_instances)) {

		ret = -EMFILE;

		goto out_free_uid;

	}



	/* fsnotify_obtain_group took a reference to group, we put this when we kill the file in the end */

	group = inotify_new_group(user, inotify_max_queued_events);

	if (IS_ERR(group)) {

		ret = PTR_ERR(group);

		goto out_free_uid;

	}



	atomic_inc(&user->inotify_devs);

	group = inotify_new_group(inotify_max_queued_events);

	if (IS_ERR(group))

		return PTR_ERR(group);



	ret = anon_inode_getfd("inotify", &inotify_fops, group,

				  O_RDONLY | flags);

	if (ret >= 0)

		return ret;



	if (ret < 0)

		fsnotify_put_group(group);

	atomic_dec(&user->inotify_devs);

out_free_uid:

	free_uid(user);



	return ret;

}

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