Currently we set the FAN_ONDIR flag in a marks ignore_mask whenever the user
wants to add something to the mask of the mark but does not explicitly specifiy
FAN_ONDIR. We also never set that flag in a marks event mask.
The problem is that even if the user has specified FAN_ONDIR with a call to
fanotify_mark() it will be set ignored as soon as a subsequent call does not
specify this flag, which may not be what the user expected.
Furthermore it is hard to ever unset FAN_ONDIR once it is set in the ignore_mask
so that a mark will very likely not be destroyed before its group is destroyed.
With this patch FAN_ONDIR is treated as every other flag, thus if specified it
is set in a marks event maks and no longer implicitly set in the ignore_mask.
Signed-off-by: Lino Sanfilippo <LinoSanfilippo@xxxxxx>
---
fs/notify/fanotify/fanotify.c | 2 +-
fs/notify/fanotify/fanotify_user.c | 16 +++-------------
2 files changed, 4 insertions(+), 14 deletions(-)
diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c
index c2ba86a..72705f2 100644
--- a/fs/notify/fanotify/fanotify.c
+++ b/fs/notify/fanotify/fanotify.c
@@ -194,7 +194,7 @@ static bool fanotify_should_send_event(struct fsnotify_group *group,
}
if (S_ISDIR(path->dentry->d_inode->i_mode) &&
- (marks_ignored_mask & FS_ISDIR))
+ !((marks_mask & ~marks_ignored_mask) & FS_ISDIR))
return false;
/*
diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index 6b9606a..acf8465 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -603,12 +603,6 @@ static __u32 fanotify_mark_add_to_mask(struct fsnotify_mark *fsn_mark,
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;
@@ -832,15 +826,11 @@ SYSCALL_DEFINE(fanotify_mark)(int fanotify_fd, unsigned int flags,
return -EINVAL;
}
- if (mask & FAN_ONDIR) {
- flags |= FAN_MARK_ONDIR;
- mask &= ~FAN_ONDIR;
- }
-
#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
- if (mask & ~(FAN_ALL_EVENTS | FAN_ALL_PERM_EVENTS | FAN_EVENT_ON_CHILD))
+ if (mask & ~(FAN_ALL_EVENTS | FAN_ALL_PERM_EVENTS | FAN_ONDIR |
+ FAN_EVENT_ON_CHILD))
#else
- if (mask & ~(FAN_ALL_EVENTS | FAN_EVENT_ON_CHILD))
+ if (mask & ~(FAN_ALL_EVENTS | FAN_ONDIR | FAN_EVENT_ON_CHILD))
#endif
return -EINVAL;
--
1.5.6.5
--
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