diff options
| author | Jan Kara <jack@suse.cz> | 2016-12-22 10:15:20 +0100 |
|---|---|---|
| committer | Paul Moore <paul@paul-moore.com> | 2016-12-23 16:40:32 -0500 |
| commit | e3ba730702af370563f66cb610b71aa0ca67955e (patch) | |
| tree | 6a7dd8a17c9fde8851366f785faa4d9ce6462fe2 | |
| parent | 533c7b69c764ad5febb3e716899f43a75564fcab (diff) | |
fsnotify: Remove fsnotify_duplicate_mark()
There are only two calls sites of fsnotify_duplicate_mark(). Those are
in kernel/audit_tree.c and both are bogus. Vfsmount pointer is unused
for audit tree, inode pointer and group gets set in
fsnotify_add_mark_locked() later anyway, mask and free_mark are already
set in alloc_chunk(). In fact, calling fsnotify_duplicate_mark() is
actively harmful because following fsnotify_add_mark_locked() will leak
group reference by overwriting the group pointer. So just remove the two
calls to fsnotify_duplicate_mark() and the function.
Signed-off-by: Jan Kara <jack@suse.cz>
[PM: line wrapping to fit in 80 chars]
Signed-off-by: Paul Moore <paul@paul-moore.com>
| -rw-r--r-- | fs/notify/mark.c | 12 | ||||
| -rw-r--r-- | include/linux/fsnotify_backend.h | 2 | ||||
| -rw-r--r-- | kernel/audit_tree.c | 8 |
3 files changed, 4 insertions, 18 deletions
diff --git a/fs/notify/mark.c b/fs/notify/mark.c index d3fea0bd89e2..6043306e8e21 100644 --- a/fs/notify/mark.c +++ b/fs/notify/mark.c @@ -510,18 +510,6 @@ void fsnotify_detach_group_marks(struct fsnotify_group *group) } } -void fsnotify_duplicate_mark(struct fsnotify_mark *new, struct fsnotify_mark *old) -{ - assert_spin_locked(&old->lock); - new->inode = old->inode; - new->mnt = old->mnt; - if (old->group) - fsnotify_get_group(old->group); - new->group = old->group; - new->mask = old->mask; - new->free_mark = old->free_mark; -} - /* * Nothing fancy, just initialize lists and locks and counters. */ diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h index 7268ed076be8..ce77caa2bb10 100644 --- a/include/linux/fsnotify_backend.h +++ b/include/linux/fsnotify_backend.h @@ -324,8 +324,6 @@ extern void fsnotify_init_mark(struct fsnotify_mark *mark, void (*free_mark)(str extern struct fsnotify_mark *fsnotify_find_inode_mark(struct fsnotify_group *group, struct inode *inode); /* find (and take a reference) to a mark associated with group and vfsmount */ extern struct fsnotify_mark *fsnotify_find_vfsmount_mark(struct fsnotify_group *group, struct vfsmount *mnt); -/* copy the values from old into new */ -extern void fsnotify_duplicate_mark(struct fsnotify_mark *new, struct fsnotify_mark *old); /* set the ignored_mask of a mark */ extern void fsnotify_set_mark_ignored_mask_locked(struct fsnotify_mark *mark, __u32 mask); /* set the mask of a mark (might pin the object into memory */ diff --git a/kernel/audit_tree.c b/kernel/audit_tree.c index 055f11b0a50f..b4b58400531f 100644 --- a/kernel/audit_tree.c +++ b/kernel/audit_tree.c @@ -258,8 +258,8 @@ static void untag_chunk(struct node *p) if (!new) goto Fallback; - fsnotify_duplicate_mark(&new->mark, entry); - if (fsnotify_add_mark(&new->mark, new->mark.group, new->mark.inode, NULL, 1)) { + if (fsnotify_add_mark(&new->mark, + entry->group, entry->inode, NULL, 1)) { fsnotify_put_mark(&new->mark); goto Fallback; } @@ -395,8 +395,8 @@ static int tag_chunk(struct inode *inode, struct audit_tree *tree) return -ENOENT; } - fsnotify_duplicate_mark(chunk_entry, old_entry); - if (fsnotify_add_mark(chunk_entry, chunk_entry->group, chunk_entry->inode, NULL, 1)) { + if (fsnotify_add_mark(chunk_entry, + old_entry->group, old_entry->inode, NULL, 1)) { spin_unlock(&old_entry->lock); fsnotify_put_mark(chunk_entry); fsnotify_put_mark(old_entry); |