On Wed, Aug 18, 2021 at 8:43 PM Joan Lledó <jlle...@mailfence.com> wrote: > El 18/8/21 a les 0:02, Sergey Bugaev ha escrit: > > To me it sounds like libpciaccess should have a Hurd-specific API > > addition that would let the user get the memory object > > That's a solution and can be done. But I'd like to know more about > vm_region first. It seems it can return the object, and I don't see why > is a security problem to allow a task to retrieve objects belonging to > itself.
Basically because it allowed the task to overcome any limitations imposed onto it by max_protection (and offset/size). If you have page 2 of a memory object mapped into your address space read-only, that shouldn't let you write to page 5. Sergey
