path: root/fs/notify/fanotify/fanotify_user.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/fanotify.h>
#include <linux/fcntl.h>
#include <linux/fdtable.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 <linux/compat.h>
#include <linux/sched/signal.h>
#include <linux/memcontrol.h>
#include <linux/statfs.h>
#include <linux/exportfs.h>

#include <asm/ioctls.h>

#include "../../mount.h"
#include "../fdinfo.h"
#include "fanotify.h"

#define FANOTIFY_DEFAULT_MAX_EVENTS	16384
#define FANOTIFY_OLD_DEFAULT_MAX_MARKS	8192
#define FANOTIFY_DEFAULT_MAX_GROUPS	128
#define FANOTIFY_DEFAULT_FEE_POOL_SIZE	32

/*
 * Legacy fanotify marks limits (8192) is per group and we introduced a tunable
 * limit of marks per user, similar to inotify.  Effectively, the legacy limit
 * of fanotify marks per user is <max marks per group> * <max groups per user>.
 * This default limit (1M) also happens to match the increased limit of inotify
 * max_user_watches since v5.10.
 */
#define FANOTIFY_DEFAULT_MAX_USER_MARKS	\
	(FANOTIFY_OLD_DEFAULT_MAX_MARKS * FANOTIFY_DEFAU