[src/trunk]: src/sys/arch/x86/x86 Disable sanitizer instrumentation in x86_ho...

[kamil <kamil%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/41f0d47e9969
branches:  trunk
changeset: 451591:41f0d47e9969
user:      kamil <kamil%NetBSD.org@localhost>
date:      Tue May 28 13:20:23 2019 +0000

description:
Disable sanitizer instrumentation in x86_hotpatch()

Local variables have empty (0-sized), unknown alignment to UBSan.
This is hard to workaround without mutating the code too much.

diffstat:

 sys/arch/x86/x86/patch.c |  10 ++++++++--
 1 files changed, 8 insertions(+), 2 deletions(-)

diffs (31 lines):

diff -r 26c97b2b63de -r 41f0d47e9969 sys/arch/x86/x86/patch.c
--- a/sys/arch/x86/x86/patch.c  Tue May 28 10:14:46 2019 +0000
+++ b/sys/arch/x86/x86/patch.c  Tue May 28 13:20:23 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: patch.c,v 1.35 2018/07/14 14:34:32 maxv Exp $  */
+/*     $NetBSD: patch.c,v 1.36 2019/05/28 13:20:23 kamil Exp $ */
 
 /*-
  * Copyright (c) 2007, 2008, 2009 The NetBSD Foundation, Inc.
@@ -34,7 +34,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: patch.c,v 1.35 2018/07/14 14:34:32 maxv Exp $");
+__KERNEL_RCSID(0, "$NetBSD: patch.c,v 1.36 2019/05/28 13:20:23 kamil Exp $");
 
 #include "opt_lockdebug.h"
 #ifdef i386
@@ -132,6 +132,12 @@
        }
 }
 
+/* The local variables have unknown alignment to UBSan */
+#if defined(__clang__)
+__attribute__((no_sanitize("undefined")))
+#else
+__attribute__((no_sanitize_undefined))
+#endif
 void
 x86_hotpatch(uint32_t name, const uint8_t *bytes, size_t size)
 {