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From: Bruce M Simpson <bms@FreeBSD.org>
Date: Sun, 5 Oct 2003 02:37:47 -0700 (PDT)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org,
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Subject: cvs commit: src/sys/kern kern_sysctl.c
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bms         2003/10/05 02:37:47 PDT

  FreeBSD src repository

  Modified files:
    sys/kern             kern_sysctl.c 
  Log:
  Fix a security problem in sysctl() the long way round.
  
  Use pre-emption detection to avoid the need for wiring a userland buffer
  when copying opaque data structures.
  
  sysctl_wire_old_buffer() is now a no-op. Other consumers of this
  API should use pre-emption detection to notice update collisions.
  
  vslock() and vsunlock() should no longer be called by any code
  and should be retired in subsequent commits.
  
  Discussed with: pete, phk
  MFC after:      1 week
  
  Revision  Changes    Path
  1.147     +14 -18    src/sys/kern/kern_sysctl.c