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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Tue, 7 Aug 2018 17:45:50 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org
Subject: svn commit: r337429 - stable/11/sys/vm
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X-List-Received-Date: Tue, 07 Aug 2018 17:45:51 -0000
Author: kib
Date: Tue Aug 7 17:45:49 2018
New Revision: 337429
URL: https://svnweb.freebsd.org/changeset/base/337429
Log:
MFC r336987:
For compat32, emulate the same wraparound check as occurs on the real
ILP32 system.
PR: 230162
Modified:
stable/11/sys/vm/vm_mmap.c
Directory Properties:
stable/11/ (props changed)
Modified: stable/11/sys/vm/vm_mmap.c
==============================================================================
--- stable/11/sys/vm/vm_mmap.c Tue Aug 7 17:44:36 2018 (r337428)
+++ stable/11/sys/vm/vm_mmap.c Tue Aug 7 17:45:49 2018 (r337429)
@@ -596,6 +596,12 @@ 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);