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linux-next/fs/notify
Amir Goldstein 2f02fd3fa1 fanotify: fix ignore mask logic for events on child and on dir
The comments in fanotify_group_event_mask() say:

  "If the event is on dir/child and this mark doesn't care about
   events on dir/child, don't send it!"

Specifically, mount and filesystem marks do not care about events
on child, but they can still specify an ignore mask for those events.
For example, a group that has:
- A mount mark with mask 0 and ignore_mask FAN_OPEN
- An inode mark on a directory with mask FAN_OPEN | FAN_OPEN_EXEC
  with flag FAN_EVENT_ON_CHILD

A child file open for exec would be reported to group with the FAN_OPEN
event despite the fact that FAN_OPEN is in ignore mask of mount mark,
because the mark iteration loop skips over non-inode marks for events
on child when calculating the ignore mask.

Move ignore mask calculation to the top of the iteration loop block
before excluding marks for events on dir/child.

Link: https://lore.kernel.org/r/20200524072441.18258-1-amir73il@gmail.com
Reported-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/linux-fsdevel/20200521162443.GA26052@quack2.suse.cz/
Fixes: 55bf882c7f "fanotify: fix merging marks masks with FAN_ONDIR"
Fixes: b469e7e47c "fanotify: fix handling of events on child..."
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
2020-05-25 10:43:56 +02:00
..
dnotify selinux/stable-5.4 PR 20190917 2019-09-23 11:21:04 -07:00
fanotify fanotify: fix ignore mask logic for events on child and on dir 2020-05-25 10:43:56 +02:00
inotify inotify: Fix error return code assignment flow. 2020-04-27 12:14:56 +02:00
fdinfo.c fsnotify: Remove proc_fs.h include 2020-05-13 17:16:14 +02:00
fdinfo.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
fsnotify.c fanotify: send FAN_DIR_MODIFY event flavor with dir inode and name 2020-03-25 10:27:16 +01:00
fsnotify.h fsnotify: move declaration of fsnotify_mark_connector_cachep to fsnotify.h 2019-10-17 10:31:12 +02:00
group.c fsnotify: add mutex destroy 2020-05-13 17:14:20 +02:00
Kconfig treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mark.c fsnotify: Add missing annotation for fsnotify_finish_user_wait() and for fsnotify_prepare_user_wait() 2020-04-15 11:44:43 +02:00
notification.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 18 2019-05-21 11:28:46 +02:00