Null pointers, one month later
Null pointers, one month later
Posted Aug 18, 2009 17:33 UTC (Tue) by cruff (subscriber, #7201)Parent article: Null pointers, one month later
Posted Aug 18, 2009 17:56 UTC (Tue)
by fuhchee (guest, #40059)
[Link] (2 responses)
Perhaps that would destroy the performance benefits of sharing the VM
information between kernel & user space (since the flag would have to be toggled on & off).
Then there would be no way cause the execution of user code even if there are additional missing NULL pointer checks?
There's also "return-oriented programming", a technique for breaking into even suchly configured machines.
Posted Aug 19, 2009 1:26 UTC (Wed)
by zlynx (guest, #2285)
[Link] (1 responses)
:-)
Posted Aug 19, 2009 4:04 UTC (Wed)
by bojan (subscriber, #14302)
[Link]
Why don't they just force the use of the no-execute page table (on processors that support it) for all kernel mappings of user space?
Null pointers, one month later
Null pointers, one month later
Null pointers, one month later