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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Wed, 23 Sep 2009 13:49:42 +0000 (UTC)
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Subject: svn commit: r197431 - in stable/8/sys: . amd64/include/xen
	cddl/contrib/opensolaris contrib/dev/acpica contrib/pf
	dev/xen/xenpci vm
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Author: kib
Date: Wed Sep 23 13:49:41 2009
New Revision: 197431
URL: http://svn.freebsd.org/changeset/base/197431

Log:
  MFC r197348:
  For a.out and pre-8 ELF binaries, allow the mmap of zero length.
  
  Approved by:	re (kensmith)

Modified:
  stable/8/sys/   (props changed)
  stable/8/sys/amd64/include/xen/   (props changed)
  stable/8/sys/cddl/contrib/opensolaris/   (props changed)
  stable/8/sys/contrib/dev/acpica/   (props changed)
  stable/8/sys/contrib/pf/   (props changed)
  stable/8/sys/dev/xen/xenpci/   (props changed)
  stable/8/sys/vm/vm_mmap.c

Modified: stable/8/sys/vm/vm_mmap.c
==============================================================================
--- stable/8/sys/vm/vm_mmap.c	Wed Sep 23 12:33:32 2009	(r197430)
+++ stable/8/sys/vm/vm_mmap.c	Wed Sep 23 13:49:41 2009	(r197431)
@@ -64,6 +64,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/mount.h>
 #include <sys/conf.h>
 #include <sys/stat.h>
+#include <sys/sysent.h>
 #include <sys/vmmeter.h>
 #include <sys/sysctl.h>
 
@@ -229,7 +230,8 @@ mmap(td, uap)
 
 	fp = NULL;
 	/* make sure mapping fits into numeric range etc */
-	if (uap->len == 0 ||
+	if ((uap->len == 0 && !SV_CURPROC_FLAG(SV_AOUT) &&
+	     curproc->p_osrel >= 800104) ||
 	    ((flags & MAP_ANON) && uap->fd != -1))
 		return (EINVAL);