On Tue, Aug 09, 2011 at 09:26:30AM +0200, Hans Verkuil wrote: ... > > Wouldn't that be a security issue ? Any application with permissions to access > > the video device could DoS the system. > > How is this any different from an application that tries to use more memory > then there is available? It's an out-of-memory situation, that can happen at > any time. Anyone can make an application that runs out of memory. > > Out-of-memory is not a security risk AFAIK. If you coun availability to security, then it is. This might not be an issue in embedded systems which have a single user, but think of the availability of the interface in e.g. a server. Also, this memory is locked to system physical memory, making it impossible to page it out to a block device. > Note BTW that in practice kmalloc already has a cap (something like 16 or 32 > MB, I believe it depends on the kernel .config) and so has CMA (the size of This is per a single allocation. A user could create any number of them. -- Sakari Ailus sakari.ailus@xxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
