cvs commit: src/sys/i386/i386 pmap.c src/sys/amd64/amd64 pmap.c

[Konstantin Belousov]

kib         2008-03-23 07:07:27 UTC

  FreeBSD src repository

  Modified files:
    sys/i386/i386        pmap.c 
    sys/amd64/amd64      pmap.c 
  Log:
  Prevent the overflow in the calculation of the next page directory.
  The overflow causes the wraparound with consequent corruption of the
  (almost) whole address space mapping.
  
  As Alan noted, pmap_copy() does not require the wrap-around checks
  because it cannot be applied to the kernel's pmap. The checks there are
  included for consistency.
  
  Reported and tested by: kris (i386/pmap.c:pmap_remove() part)
  Reviewed by:    alc
  MFC after:      1 week
  
  Revision  Changes    Path
  1.607     +19 -1     src/sys/amd64/amd64/pmap.c
  1.609     +6 -0      src/sys/i386/i386/pmap.c