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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Tue, 27 Oct 2009 10:15:58 +0000 (UTC)
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Subject: cvs commit: src/sys/vm vm_fault.c vm_map.c
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kib         2009-10-27 10:15:58 UTC

  FreeBSD src repository

  Modified files:
    sys/vm               vm_fault.c vm_map.c 
  Log:
  SVN rev 198505 on 2009-10-27 10:15:58Z by kib
  
  When protection of wired read-only mapping is changed to read-write,
  install new shadow object behind the map entry and copy the pages
  from the underlying objects to it. This makes the mprotect(2) call to
  actually perform the requested operation instead of silently do nothing
  and return success, that causes SIGSEGV on later write access to the
  mapping.
  
  Reuse vm_fault_copy_entry() to do the copying, modifying it to behave
  correctly when src_entry == dst_entry.
  
  Reviewed by:    alc
  MFC after:      3 weeks
  
  Revision  Changes    Path
  1.257     +46 -16    src/sys/vm/vm_fault.c
  1.421     +10 -4     src/sys/vm/vm_map.c