diff options
| -rw-r--r-- | fs/overlayfs/util.c | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c index 01755bc186c9..33a7c60be3ed 100644 --- a/fs/overlayfs/util.c +++ b/fs/overlayfs/util.c @@ -459,7 +459,32 @@ bool ovl_is_whiteout(struct dentry *dentry) struct file *ovl_path_open(struct path *path, int flags) { - return dentry_open(path, flags | O_NOATIME, current_cred()); + struct inode *inode = d_inode(path->dentry); + int err, acc_mode; + + if (flags & ~(O_ACCMODE | O_LARGEFILE)) + BUG(); + + switch (flags & O_ACCMODE) { + case O_RDONLY: + acc_mode = MAY_READ; + break; + case O_WRONLY: + acc_mode = MAY_WRITE; + break; + default: + BUG(); + } + + err = inode_permission(inode, acc_mode | MAY_OPEN); + if (err) + return ERR_PTR(err); + + /* O_NOATIME is an optimization, don't fail if not permitted */ + if (inode_owner_or_capable(inode)) + flags |= O_NOATIME; + + return dentry_open(path, flags, current_cred()); } /* Caller should hold ovl_inode->lock */ |