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fanotify: permissions and blocking

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This is the backend work needed for fanotify to support the new
FS_OPEN_PERM and FS_ACCESS_PERM fsnotify events.  This is done using the
new fsnotify secondary queue.  No userspace interface is provided actually
respond to or request these events.

Signed-off-by: Eric Paris <eparis@redhat.com>
This commit is contained in:
Eric Paris 2009-12-17 21:24:34 -05:00
commit 9e66e4233d
5 changed files with 99 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

18
include/linux/fanotify.h
View file

@ -15,6 +15,9 @@
/* FIXME currently Q's have no limit.... */
#define FAN_Q_OVERFLOW 0x00004000 /* Event queued overflowed */
#define FAN_OPEN_PERM 0x00010000 /* File open in perm check */
#define FAN_ACCESS_PERM 0x00020000 /* File accessed in perm check */
/* helper events */
#define FAN_CLOSE (FAN_CLOSE_WRITE | FAN_CLOSE_NOWRITE) /* close */
@ -52,7 +55,14 @@
FAN_CLOSE |\
FAN_OPEN)
/*
* All events which require a permission response from userspace
*/
#define FAN_ALL_PERM_EVENTS (FAN_OPEN_PERM |\
FAN_ACCESS_PERM)
#define FAN_ALL_OUTGOING_EVENTS (FAN_ALL_EVENTS |\
FAN_ALL_PERM_EVENTS |\
FAN_Q_OVERFLOW)
#define FANOTIFY_METADATA_VERSION 1
@ -65,6 +75,10 @@ struct fanotify_event_metadata {
__s64 pid;
} __attribute__ ((packed));
/* Legit userspace responses to a _PERM event */
#define FAN_ALLOW 0x01
#define FAN_DENY 0x02
/* Helper functions to deal with fanotify_event_metadata buffers */
#define FAN_EVENT_METADATA_LEN (sizeof(struct fanotify_event_metadata))
@ -78,5 +92,9 @@ struct fanotify_event_metadata {
#ifdef __KERNEL__
struct fanotify_wait {
struct fsnotify_event *event;
__s32 fd;
};
#endif /* __KERNEL__ */
#endif /* _LINUX_FANOTIFY_H */

12
include/linux/fsnotify_backend.h
View file

@ -159,6 +159,14 @@ struct fsnotify_group {
struct fasync_struct *fa; /* async notification */
struct user_struct *user;
} inotify_data;
#endif
#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
struct fanotify_group_private_data {
/* allows a group to block waiting for a userspace response */
struct mutex access_mutex;
struct list_head access_list;
wait_queue_head_t access_waitq;
} fanotify_data;
#endif
};
};
@ -227,6 +235,10 @@ struct fsnotify_event {
size_t name_len;
struct pid *tgid;
#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
__u32 response; /* userspace answer to question */
#endif /* CONFIG_FANOTIFY_ACCESS_PERMISSIONS */
struct list_head private_data_list; /* groups can store private data here */
};