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authorAmir Goldstein <amir73il@gmail.com>2020-05-24 10:24:41 +0300
committerJan Kara <jack@suse.cz>2020-05-25 10:43:56 +0200
commit2f02fd3fa13e51713b630164f8a8e5b42de8283b (patch)
treeec622ee1d08a8ea486de9b8798e238a32ad5fff7 /fs/notify
parent5e23663b49e1e8ee6b805356259e3062edac5e2b (diff)
downloadlinux-2f02fd3fa13e51713b630164f8a8e5b42de8283b.tar.bz2
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: 55bf882c7f13 "fanotify: fix merging marks masks with FAN_ONDIR" Fixes: b469e7e47c8a "fanotify: fix handling of events on child..." Signed-off-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/notify')
-rw-r--r--fs/notify/fanotify/fanotify.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c
index 95480d3dcff7..e22fd8f8c281 100644
--- a/fs/notify/fanotify/fanotify.c
+++ b/fs/notify/fanotify/fanotify.c
@@ -232,6 +232,10 @@ static u32 fanotify_group_event_mask(struct fsnotify_group *group,
if (!fsnotify_iter_should_report_type(iter_info, type))
continue;
mark = iter_info->marks[type];
+
+ /* Apply ignore mask regardless of ISDIR and ON_CHILD flags */
+ marks_ignored_mask |= mark->ignored_mask;
+
/*
* If the event is on dir and this mark doesn't care about
* events on dir, don't send it!
@@ -249,7 +253,6 @@ static u32 fanotify_group_event_mask(struct fsnotify_group *group,
continue;
marks_mask |= mark->mask;
- marks_ignored_mask |= mark->ignored_mask;
}
test_mask = event_mask & marks_mask & ~marks_ignored_mask;