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From: John Baldwin <jhb@FreeBSD.org>
Date: Tue, 14 Jul 2009 19:45:36 +0000 (UTC)
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Subject: svn commit: r195693 - in head: lib/libc/sys sys/vm
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Author: jhb
Date: Tue Jul 14 19:45:36 2009
New Revision: 195693
URL: http://svn.freebsd.org/changeset/base/195693

Log:
  - Change mmap() to fail requests with EINVAL that pass a length of 0.  This
    behavior is mandated by POSIX.
  - Do not fail requests that pass a length greater than SSIZE_MAX
    (such as > 2GB on 32-bit platforms).  The 'len' parameter is actually
    an unsigned 'size_t' so negative values don't really make sense.
  
  Submitted by:	Alexander Best  alexbestms at math.uni-muenster.de
  Reviewed by:	alc
  Approved by:	re (kib)
  MFC after:	1 week

Modified:
  head/lib/libc/sys/mmap.2
  head/sys/vm/vm_mmap.c

Modified: head/lib/libc/sys/mmap.2
==============================================================================
--- head/lib/libc/sys/mmap.2	Tue Jul 14 19:37:53 2009	(r195692)
+++ head/lib/libc/sys/mmap.2	Tue Jul 14 19:45:36 2009	(r195693)
@@ -28,7 +28,7 @@
 .\"	@(#)mmap.2	8.4 (Berkeley) 5/11/95
 .\" $FreeBSD$
 .\"
-.Dd October 24, 2008
+.Dd July 14, 2009
 .Dt MMAP 2
 .Os
 .Sh NAME
@@ -306,7 +306,7 @@ resides out of the valid address space f
 The
 .Fa len
 argument
-was negative.
+was equal to zero.
 .It Bq Er EINVAL
 .Dv MAP_ANON
 was specified and the

Modified: head/sys/vm/vm_mmap.c
==============================================================================
--- head/sys/vm/vm_mmap.c	Tue Jul 14 19:37:53 2009	(r195692)
+++ head/sys/vm/vm_mmap.c	Tue Jul 14 19:45:36 2009	(r195693)
@@ -229,7 +229,7 @@ mmap(td, uap)
 
 	fp = NULL;
 	/* make sure mapping fits into numeric range etc */
-	if ((ssize_t) uap->len < 0 ||
+	if (uap->len == 0 ||
 	    ((flags & MAP_ANON) && uap->fd != -1))
 		return (EINVAL);