Hello, On Wed, Aug 07, 2013 at 03:46:54PM +0200, Michal Hocko wrote: > OK, I have obviously misunderstood your concern mentioned in the other > email. Could you be more specific what is the DoS scenario which was > your concern, then? So, let's say the file is write-accessible to !priv user which is under reasonable resource limits. Normally this shouldn't affect priv system tools which are monitoring the same event as it shouldn't be able to deplete resources as long as the resource control mechanisms are configured and functioning properly; however, the memory usage event puts all event listeners into a single contiguous table which a !priv user can easily expand to a size where the table can no longer be enlarged and if a priv system tool or another user tries to register event afterwards, it'll fail. IOW, it creates a shared resource which isn't properly provisioned and can be trivially filled up making it an easy DoS target. Putting an extra limit on it isn't an actual solution but could be better, I think. It at least makes it clear that this is a limited global resource. Thanks. -- tejun -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>