At Wed, 10 Jan 2007 23:36:54 +0100, Pierre THIERRY wrote: > Scribit Neal H. Walfield dies 10/01/2007 hora 20:20: > > The application requests the schedule which the resource manager > > considers in light of the current policy configuration. When it is > > not longer possible to meet the requested schedule, the resource > > manager will send the application a fault when it is next scheduled to > > run. > > In the general case, isn't this an opportunity to create covert > channels? I had understood from previous discussions (here or on the > Coyotos list) that application should in general not be aware of > system-wide information such as memory pressure because of this issue. > > Of course, I understand there are exceptions. I'm happy that my video > player is able to detect how much frames it drops because of scheduling > difficulties, and suggest me to solve the external problem while it > stops to play.
Sure. If we get to point where the least expensive attack (and that is, I think, what attackers are looking for) is via covert channels, I'll feel that we'll have really accomplished something. Neal _______________________________________________ L4-hurd mailing list [email protected] http://lists.gnu.org/mailman/listinfo/l4-hurd
