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Subject[PATCH v3 3/3] fanotify: dont set FAN_ONDIR implicitly on a marks ignored mask
Date
Currently FAN_ONDIR is always set on a marks ignored mask when the event mask
is extended without FAN_MARK_ONDIR being set. This may result in events for
directories being ignored unexpectedly for call sequences like

fanotify_mark(fd, FAN_MARK_ADD, FAN_OPEN | FAN_ONDIR , AT_FDCWD, "dir");
fanotify_mark(fd, FAN_MARK_ADD, FAN_CLOSE, AT_FDCWD, "dir");

Also FAN_MARK_ONDIR is only honored when adding events to a marks mask, but
not for event removal. Fix both issues by not setting FAN_ONDIR implicitly on
the ignore mask any more. Instead treat FAN_ONDIR as any other event flag and
require FAN_MARK_ONDIR to be set by the user for both event mask and ignore
mask. Furthermore take FAN_MARK_ONDIR into account when set for event removal.

Signed-off-by: Lino Sanfilippo <LinoSanfilippo@gmx.de>
Reviewed-by: Jan Kara <jack@suse.cz>
---
fs/notify/fanotify/fanotify.c | 2 +-
fs/notify/fanotify/fanotify_user.c | 24 ++++++++++++++++--------
2 files changed, 17 insertions(+), 9 deletions(-)

diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c
index 30d3add..51ceb81 100644
--- a/fs/notify/fanotify/fanotify.c
+++ b/fs/notify/fanotify/fanotify.c
@@ -140,7 +140,7 @@ static bool fanotify_should_send_event(struct fsnotify_mark *inode_mark,
}

if (S_ISDIR(path->dentry->d_inode->i_mode) &&
- (marks_ignored_mask & FS_ISDIR))
+ !(marks_mask & FS_ISDIR & ~marks_ignored_mask))
return false;

if (event_mask & marks_mask & ~marks_ignored_mask)
diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index ddc33fb..683d140 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -491,10 +491,17 @@ static __u32 fanotify_mark_remove_from_mask(struct fsnotify_mark *fsn_mark,

spin_lock(&fsn_mark->lock);
if (!(flags & FAN_MARK_IGNORED_MASK)) {
+ __u32 tmask = fsn_mark->mask & ~mask;
+ if (flags & FAN_MARK_ONDIR)
+ tmask &= ~FAN_ONDIR;
+
oldmask = fsn_mark->mask;
- fsnotify_set_mark_mask_locked(fsn_mark, (oldmask & ~mask));
+ fsnotify_set_mark_mask_locked(fsn_mark, tmask);
} else {
__u32 tmask = fsn_mark->ignored_mask & ~mask;
+ if (flags & FAN_MARK_ONDIR)
+ tmask &= ~FAN_ONDIR;
+
fsnotify_set_mark_ignored_mask_locked(fsn_mark, tmask);
}
*destroy = !(fsn_mark->mask | fsn_mark->ignored_mask);
@@ -568,20 +575,21 @@ static __u32 fanotify_mark_add_to_mask(struct fsnotify_mark *fsn_mark,

spin_lock(&fsn_mark->lock);
if (!(flags & FAN_MARK_IGNORED_MASK)) {
+ __u32 tmask = fsn_mark->mask | mask;
+ if (flags & FAN_MARK_ONDIR)
+ tmask |= FAN_ONDIR;
+
oldmask = fsn_mark->mask;
- fsnotify_set_mark_mask_locked(fsn_mark, (oldmask | mask));
+ fsnotify_set_mark_mask_locked(fsn_mark, tmask);
} else {
__u32 tmask = fsn_mark->ignored_mask | mask;
+ if (flags & FAN_MARK_ONDIR)
+ tmask |= FAN_ONDIR;
+
fsnotify_set_mark_ignored_mask_locked(fsn_mark, tmask);
if (flags & FAN_MARK_IGNORED_SURV_MODIFY)
fsn_mark->flags |= FSNOTIFY_MARK_FLAG_IGNORED_SURV_MODIFY;
}
-
- if (!(flags & FAN_MARK_ONDIR)) {
- __u32 tmask = fsn_mark->ignored_mask | FAN_ONDIR;
- fsnotify_set_mark_ignored_mask_locked(fsn_mark, tmask);
- }
-
spin_unlock(&fsn_mark->lock);

return mask & ~oldmask;
--
1.9.1


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