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fanotify: introduce new event mask FAN_OPEN_EXEC

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A new event mask FAN_OPEN_EXEC has been defined so that users have the
ability to receive events specifically when a file has been opened with
the intent to be executed. Events of FAN_OPEN_EXEC type will be
generated when a file has been opened using either execve(), execveat()
or uselib() system calls.

The feature is implemented within fsnotify_open() by generating the
FAN_OPEN_EXEC event type if __FMODE_EXEC is set within file->f_flags.

Signed-off-by: Matthew Bobrowski <mbobrowski@mbobrowski.org>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Matthew Bobrowski 2018-11-08 14:07:14 +11:00 committed by Jan Kara
parent 2d10b23082
commit 9b076f1c0f
6 changed files with 12 additions and 5 deletions
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3
fs/notify/fanotify/fanotify.c
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@ -210,8 +210,9 @@ static int fanotify_handle_event(struct fsnotify_group *group,
BUILD_BUG_ON(FAN_OPEN_PERM != FS_OPEN_PERM);
BUILD_BUG_ON(FAN_ACCESS_PERM != FS_ACCESS_PERM);
BUILD_BUG_ON(FAN_ONDIR != FS_ISDIR);
BUILD_BUG_ON(FAN_OPEN_EXEC != FS_OPEN_EXEC);
BUILD_BUG_ON(HWEIGHT32(ALL_FANOTIFY_EVENT_BITS) != 10);
BUILD_BUG_ON(HWEIGHT32(ALL_FANOTIFY_EVENT_BITS) != 11);
mask = fanotify_group_event_mask(iter_info, mask, data, data_type);
if (!mask)

2
fs/notify/fsnotify.c
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@ -401,7 +401,7 @@ static __init int fsnotify_init(void)
{
int ret;
BUILD_BUG_ON(HWEIGHT32(ALL_FSNOTIFY_BITS) != 23);
BUILD_BUG_ON(HWEIGHT32(ALL_FSNOTIFY_BITS) != 24);
ret = init_srcu_struct(&fsnotify_mark_srcu);
if (ret)

2
include/linux/fanotify.h
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@ -37,7 +37,7 @@
/* Events that user can request to be notified on */
#define FANOTIFY_EVENTS (FAN_ACCESS | FAN_MODIFY | \
FAN_CLOSE | FAN_OPEN)
FAN_CLOSE | FAN_OPEN | FAN_OPEN_EXEC)
/* Events that require a permission response from user */
#define FANOTIFY_PERM_EVENTS (FAN_OPEN_PERM | FAN_ACCESS_PERM)

2
include/linux/fsnotify.h
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@ -215,6 +215,8 @@ static inline void fsnotify_open(struct file *file)
if (S_ISDIR(inode->i_mode))
mask |= FS_ISDIR;
if (file->f_flags & __FMODE_EXEC)
mask |= FS_OPEN_EXEC;
fsnotify_parent(path, NULL, mask);
fsnotify(inode, mask, path, FSNOTIFY_EVENT_PATH, NULL, 0);

7
include/linux/fsnotify_backend.h
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@ -38,6 +38,7 @@
#define FS_DELETE 0x00000200 /* Subfile was deleted */
#define FS_DELETE_SELF 0x00000400 /* Self was deleted */
#define FS_MOVE_SELF 0x00000800 /* Self was moved */
#define FS_OPEN_EXEC 0x00001000 /* File was opened for exec */
#define FS_UNMOUNT 0x00002000 /* inode on umount fs */
#define FS_Q_OVERFLOW 0x00004000 /* Event queued overflowed */
@ -62,7 +63,8 @@
#define FS_EVENTS_POSS_ON_CHILD (FS_ACCESS | FS_MODIFY | FS_ATTRIB |\
FS_CLOSE_WRITE | FS_CLOSE_NOWRITE | FS_OPEN |\
FS_MOVED_FROM | FS_MOVED_TO | FS_CREATE |\
FS_DELETE | FS_OPEN_PERM | FS_ACCESS_PERM)
FS_DELETE | FS_OPEN_PERM | FS_ACCESS_PERM | \
FS_OPEN_EXEC)
#define FS_MOVE (FS_MOVED_FROM | FS_MOVED_TO)
@ -74,7 +76,8 @@
FS_MOVED_FROM | FS_MOVED_TO | FS_CREATE | \
FS_DELETE | FS_DELETE_SELF | FS_MOVE_SELF | \
FS_UNMOUNT | FS_Q_OVERFLOW | FS_IN_IGNORED | \
FS_OPEN_PERM | FS_ACCESS_PERM | FS_DN_RENAME)
FS_OPEN_PERM | FS_ACCESS_PERM | FS_DN_RENAME | \
FS_OPEN_EXEC)
/* Extra flags that may be reported with event or control handling of events */
#define ALL_FSNOTIFY_FLAGS (FS_EXCL_UNLINK | FS_ISDIR | FS_IN_ONESHOT | \

1
include/uapi/linux/fanotify.h
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@ -10,6 +10,7 @@
#define FAN_CLOSE_WRITE 0x00000008 /* Writtable file closed */
#define FAN_CLOSE_NOWRITE 0x00000010 /* Unwrittable file closed */
#define FAN_OPEN 0x00000020 /* File was opened */
#define FAN_OPEN_EXEC 0x00001000 /* File was opened for exec */
#define FAN_Q_OVERFLOW 0x00004000 /* Event queued overflowed */