git: DragonFly_RELEASE_5_6 kernel - Fix SMAP/SMEP caught user mode access part 2/2.

[Matthew Dillon]

commit 5119e9d2dbae1d865ef34eaa923c1e40d50c76a1
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Sat Jun 15 15:04:04 2019 -0700

    kernel - Fix SMAP/SMEP caught user mode access part 2/2.
    
    * Finish implementing SMAP exception handling support by
      properly detecting it in trap() and generating a panic().
      Otherwise the cpu just locks up in a page-fault loop without
      any indication as to why on the console.
    
    * To properly support SMAP, make sure AC is cleared on system calls
      (it is already cleared on any interrupt or exception by the frame
      push code but I missed the syscall entry code).

Summary of changes:
 sys/platform/pc64/x86_64/machdep.c    |  2 +-
 sys/platform/pc64/x86_64/mp_machdep.c |  2 +-
 sys/platform/pc64/x86_64/trap.c       | 61 ++++++++++++++++++++++++++++-------
 3 files changed, 51 insertions(+), 14 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/5119e9d2dbae1d865ef34eaa923c1e40d50c76a1


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