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From: Jamie Gritton <jamie@FreeBSD.org>
Date: Thu, 30 Jul 2009 14:28:56 +0000 (UTC)
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Subject: cvs commit: src/sys/kern kern_jail.c
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jamie       2009-07-30 14:28:56 UTC

  FreeBSD src repository

  Modified files:
    sys/kern             kern_jail.c 
  Log:
  SVN rev 195974 on 2009-07-30 14:28:56Z by jamie
  
  Remove a LOR, where the the sleepable allprison_lock was being obtained
  in prison_equal_ip4/6 while an inp mutex was held.  Locking allprison_lock
  can be avoided by making a restriction on the IP addresses associated with
  jails:
  
  Don't allow the "ip4" and "ip6" parameters to be changed after a jail is
  created.  Setting the "ip4.addr" and "ip6.addr" parameters is allowed,
  but only if the jail was already created with either ip4/6=new or
  ip4/6=disable.  With this restriction, the prison flags in question
  (PR_IP4_USER and PR_IP6_USER) become read-only and can be checked
  without locking.
  
  This also allows the simplification of a messy code path that was needed
  to handle an existing prison gaining an IP address list.
  
  PR:             kern/136899
  Reported by:    Dirk Meyer
  Approved by:    re (kib), bz (mentor)
  
  Revision  Changes    Path
  1.116     +187 -309  src/sys/kern/kern_jail.c