Am Freitag, den 13.07.2012, 21:19 +0300 schrieb Michael S. Tsirkin: > > UIO has the same property, doesn't it? Multiple users can > access device memory through sysfs. Indeed, that's a similar problem. I haven't tried it (yet), but this particular problem can maybe circumvented by using mmap with the MAP_PRIVATE flag. Doing so is the responsibility of the driver programmer (like Hans already said). Even if that mmap trick does not work, it is pretty much sure that a BAR is already used by another program, if a related kernel driver is loaded. In that case the kernel has a chance to avoid such BAR race conditions by not giving the possibility to map them to the userspace. Nevertheless, I'm pretty sure that the possibility via sysfs to access BARs, which are already managed by a kernel driver, opens the door for denial of service attacks. On the other hand, I'm quite a newbie on this topic and maybe I don't see the big picture here. Therefore it is up to you guys to make the right decision (if needed). -- Gruß Dominic -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
