On Fri, 21 Feb 2003, Terry Lambert wrote:
> Yevgeniy Aleynikov wrote: > > As pointed by Ken - we do have alot of file renames (qmail). > > But 2-nd solution, directory-only rename serialization, probably won't > > affect performance as much. > > > > But i believe it's not only us who's gonna have problem when exploit > > code will be known by everybody sooner or later.... > > Dan's non-atomicity assumption on renames is incorrect. > > Even if it's were correct, it's possible to recover fully following > a failure, because metadata updates are ordered (there is a real > synchronization between dependent operations). > > I think that a workaround would be to comment the directory fsync() > code out of qmail, which apparently thinks it's running on extfs > or an async mounted FFS. If you don't want to lose mail then qmail needs to do a fsync after it does the rename. > > -- Terry > > To Unsubscribe: send mail to [EMAIL PROTECTED] > with "unsubscribe freebsd-hackers" in the body of the message > To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-hackers" in the body of the message
