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From: Colin Percival <cperciva@FreeBSD.org>
Date: Tue, 13 Jul 2010 02:45:19 +0000 (UTC)
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Subject: svn commit: r209964 - head/sys/kern releng/7.1 releng/7.1/sys/conf
	releng/7.1/sys/kern releng/7.3 releng/7.3/sys/conf
	releng/7.3/sys/kern releng/8.0 releng/8.0/sys/conf
	releng/8.0/sys/kern releng/8...
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Author: cperciva
Date: Tue Jul 13 02:45:17 2010
New Revision: 209964
URL: http://svn.freebsd.org/changeset/base/209964

Log:
  Correctly copy the M_RDONLY flag when duplicating a reference
  to an mbuf external buffer.
  
  Approved by:	so (cperciva)
  Approved by:	re (kensmith)
  Security:	FreeBSD-SA-10:07.mbuf

Modified:
  head/sys/kern/uipc_mbuf.c

Changes in other areas also in this revision:
Modified:
  releng/7.1/UPDATING
  releng/7.1/sys/conf/newvers.sh
  releng/7.1/sys/kern/uipc_mbuf.c
  releng/7.3/UPDATING
  releng/7.3/sys/conf/newvers.sh
  releng/7.3/sys/kern/uipc_mbuf.c
  releng/8.0/UPDATING
  releng/8.0/sys/conf/newvers.sh
  releng/8.0/sys/kern/uipc_mbuf.c
  releng/8.1/UPDATING
  releng/8.1/sys/kern/uipc_mbuf.c
  stable/7/sys/kern/uipc_mbuf.c
  stable/8/sys/kern/uipc_mbuf.c

Modified: head/sys/kern/uipc_mbuf.c
==============================================================================
--- head/sys/kern/uipc_mbuf.c	Tue Jul 13 01:24:02 2010	(r209963)
+++ head/sys/kern/uipc_mbuf.c	Tue Jul 13 02:45:17 2010	(r209964)
@@ -302,6 +302,7 @@ mb_dupcl(struct mbuf *n, struct mbuf *m)
 	n->m_ext.ref_cnt = m->m_ext.ref_cnt;
 	n->m_ext.ext_type = m->m_ext.ext_type;
 	n->m_flags |= M_EXT;
+	n->m_flags |= m->m_flags & M_RDONLY;
 }
 
 /*