CVSROOT: /cvs
Module name: src
Changes by: [email protected] 2019/02/15 09:46:59
Modified files:
sys/uvm : uvm_map.c
Log message:
With an opportunistic check performed at every trap, we insist userland
sp must be on a MAP_STACK page. Relax the check a bit -- the sp may be
on a PROT_NONE page. Can't see how an attacker can leverage that situation.
(New perl build process contains a "how many call frames can my stack
hold" checker, and this triggers via the MAP_STACK fault rather than
the normal access check. The MAP_STACK check still has a kernel printf
as we hunt for applications which map stacks poorly. Interestingly the
perl code has a knob to disable similar printing alerts on Windows, which
apparently has a feature somewhat like MAP_STACK!)
ok tedu guenther kettenis
