On Wed, Jun 17, 2015 at 03:20:44PM +0200, Paolo Bonzini wrote: > > > On 17/06/2015 15:13, Michael S. Tsirkin wrote: > > > > Considering userspace can be malicious, I guess yes. > > > I don't think it's a valid concern in this case, > > > setting limit back from 509 to 64 will not help here in any way, > > > userspace still can create as many vhost instances as it needs > > > to consume memory it desires. > > > > Not really since vhost char device isn't world-accessible. > > It's typically opened by a priveledged tool, the fd is > > then passed to an unpriveledged userspace, or permissions dropped. > > Then what's the concern anyway? > > Paolo
Each fd now ties up 16K of kernel memory. It didn't use to, so priveledged tool could safely give the unpriveledged userspace a ton of these fds. -- MST -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
