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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Tue, 31 Jul 2018 18:00:47 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r336987 - head/sys/vm
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Author: kib
Date: Tue Jul 31 18:00:47 2018
New Revision: 336987
URL: https://svnweb.freebsd.org/changeset/base/336987

Log:
  For compat32, emulate the same wraparound check as occurs on the real
  ILP32 system.
  
  Reported by and discussed with:	asomers
  PR:	230162
  Sponsored by:	The FreeBSD Foundation
  MFC after:	1 week
  Differential revision:	https://reviews.freebsd.org/D16525

Modified:
  head/sys/vm/vm_mmap.c

Modified: head/sys/vm/vm_mmap.c
==============================================================================
--- head/sys/vm/vm_mmap.c	Tue Jul 31 17:53:24 2018	(r336986)
+++ head/sys/vm/vm_mmap.c	Tue Jul 31 18:00:47 2018	(r336987)
@@ -600,6 +600,12 @@ kern_mprotect(struct thread *td, uintptr_t addr0, size
 	addr -= pageoff;
 	size += pageoff;
 	size = (vm_size_t) round_page(size);
+#ifdef COMPAT_FREEBSD32
+	if (SV_PROC_FLAG(td->td_proc, SV_ILP32)) {
+		if (((addr + size) & 0xffffffff) < addr)
+			return (EINVAL);
+	} else
+#endif
 	if (addr + size < addr)
 		return (EINVAL);