fanotify: introduce new event mask FAN_OPEN_EXEC

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>

2 files changed, 3 insertions, 2 deletions

diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c
index f4f8359bc597..5a1a15f646ba 100644
--- a/fs/notify/fanotify/fanotify.c
+++ b/fs/notify/fanotify/fanotify.c
@@ -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)
diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c
index d2c34900ae05..b3f58f36a0ab 100644
--- a/fs/notify/fsnotify.c
+++ b/fs/notify/fsnotify.c
@@ -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)