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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Tue, 17 Nov 2009 18:38:00 +0000 (UTC)
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X-FreeBSD-CVS-Branch: RELENG_8
Subject: cvs commit: src/sys/vm vm_fault.c vm_map.c
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kib         2009-11-17 18:38:00 UTC

  FreeBSD src repository

  Modified files:        (Branch: RELENG_8)
    sys/vm               vm_fault.c vm_map.c 
  Log:
  SVN rev 199416 on 2009-11-17 18:38:00Z by kib
  
  MFC r198505:
  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.
  
  Revision   Changes    Path
  1.254.2.4  +46 -16    src/sys/vm/vm_fault.c
  1.419.2.3  +10 -4     src/sys/vm/vm_map.c