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authorJan Kara <jack@suse.cz>2016-12-14 13:53:46 +0100
committerJan Kara <jack@suse.cz>2017-04-03 16:56:40 +0200
commitc97476400d3b73376fc055e828d7388d6b9ea99a (patch)
treeb15631b7c16455ed37f52ec3b56d3dcb7ed4e35a
parent25c829afbd74fb9594d2351d9e41be05bacb9903 (diff)
fanotify: Move recalculation of inode / vfsmount mask under mark_mutex
Move recalculation of inode / vfsmount notification mask under group->mark_mutex of the mark which was modified. These are the only places where mask recalculation happens without mark being protected from detaching from inode / vfsmount which will cause issues with the following patches. Reviewed-by: Miklos Szeredi <mszeredi@redhat.com> Reviewed-by: Amir Goldstein <amir73il@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>
-rw-r--r--fs/notify/fanotify/fanotify_user.c15
1 files changed, 6 insertions, 9 deletions
diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
index 2b37f2785834..c5e69870287f 100644
--- a/fs/notify/fanotify/fanotify_user.c
+++ b/fs/notify/fanotify/fanotify_user.c
@@ -542,6 +542,8 @@ static int fanotify_remove_vfsmount_mark(struct fsnotify_group *group,
removed = fanotify_mark_remove_from_mask(fsn_mark, mask, flags,
&destroy_mark);
+ if (removed & real_mount(mnt)->mnt_fsnotify_mask)
+ fsnotify_recalc_vfsmount_mask(mnt);
if (destroy_mark)
fsnotify_detach_mark(fsn_mark);
mutex_unlock(&group->mark_mutex);
@@ -549,9 +551,6 @@ static int fanotify_remove_vfsmount_mark(struct fsnotify_group *group,
fsnotify_free_mark(fsn_mark);
fsnotify_put_mark(fsn_mark);
- if (removed & real_mount(mnt)->mnt_fsnotify_mask)
- fsnotify_recalc_vfsmount_mask(mnt);
-
return 0;
}
@@ -572,6 +571,8 @@ static int fanotify_remove_inode_mark(struct fsnotify_group *group,
removed = fanotify_mark_remove_from_mask(fsn_mark, mask, flags,
&destroy_mark);
+ if (removed & inode->i_fsnotify_mask)
+ fsnotify_recalc_inode_mask(inode);
if (destroy_mark)
fsnotify_detach_mark(fsn_mark);
mutex_unlock(&group->mark_mutex);
@@ -580,8 +581,6 @@ static int fanotify_remove_inode_mark(struct fsnotify_group *group,
/* matches the fsnotify_find_inode_mark() */
fsnotify_put_mark(fsn_mark);
- if (removed & inode->i_fsnotify_mask)
- fsnotify_recalc_inode_mask(inode);
return 0;
}
@@ -657,10 +656,9 @@ static int fanotify_add_vfsmount_mark(struct fsnotify_group *group,
}
}
added = fanotify_mark_add_to_mask(fsn_mark, mask, flags);
- mutex_unlock(&group->mark_mutex);
-
if (added & ~real_mount(mnt)->mnt_fsnotify_mask)
fsnotify_recalc_vfsmount_mask(mnt);
+ mutex_unlock(&group->mark_mutex);
fsnotify_put_mark(fsn_mark);
return 0;
@@ -695,10 +693,9 @@ static int fanotify_add_inode_mark(struct fsnotify_group *group,
}
}
added = fanotify_mark_add_to_mask(fsn_mark, mask, flags);
- mutex_unlock(&group->mark_mutex);
-
if (added & ~inode->i_fsnotify_mask)
fsnotify_recalc_inode_mask(inode);
+ mutex_unlock(&group->mark_mutex);
fsnotify_put_mark(fsn_mark);
return 0;