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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Sun, 14 Nov 2010 17:53:52 +0000 (UTC)
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Subject: cvs commit: src/sys/vm vm_map.c
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kib         2010-11-14 17:53:52 UTC

  FreeBSD src repository

  Modified files:
    sys/vm               vm_map.c 
  Log:
  SVN rev 215307 on 2010-11-14 17:53:52Z by kib
  
  Implement a (soft) stack guard page for auto-growing stack mappings.
  The unmapped page separates the tip of the stack and possible adjanced
  segment, making some uses of stack overflow harder.  The stack growing
  code refuses to expand the segment to the last page of the reseved
  region when sysctl security.bsd.stack_guard_page is set to 1. The
  default value for sysctl and accompanying tunable is 0.
  
  Please note that mmap(MAP_FIXED) still can place a mapping right up to
  the stack, making continuous region.
  
  Reviewed by:    alc
  MFC after:      1 week
  
  Revision  Changes    Path
  1.437     +13 -1     src/sys/vm/vm_map.c