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From: Alan Cox <alc@FreeBSD.org>
Date: Wed, 13 May 2009 07:42:53 +0000 (UTC)
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Subject: cvs commit: src/sys/amd64/amd64 pmap.c src/sys/i386/i386 pmap.c
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alc         2009-05-13 07:42:53 UTC

  FreeBSD src repository

  Modified files:
    sys/amd64/amd64      pmap.c 
    sys/i386/i386        pmap.c 
  Log:
  SVN rev 192035 on 2009-05-13 07:42:53Z by alc
  
  Correct a rare use-after-free error in pmap_copy().  This error was
  introduced in amd64 revision 1.540 and i386 revision 1.547.  However, it
  had no harmful effects until after a recent change, r189698, on amd64.
  (In other words, the error is harmless in RELENG_7.)
  
  The error is triggered by the failure to allocate a pv entry for the one
  and only mapping in a page table page.  I am addressing the error by
  changing pmap_copy() to abort if either pv entry allocation or page
  table page allocation fails.  This is appropriate because the creation of
  mappings by pmap_copy() is optional.  They are a (possible) optimization,
  and not a requirement.
  
  Correct a nearby whitespace error in the i386 pmap_copy().
  
  Crash reported by: jeff@
  MFC after:      6 weeks
  
  Revision  Changes    Path
  1.658     +3 -1      src/sys/amd64/amd64/pmap.c
  1.634     +4 -2      src/sys/i386/i386/pmap.c