1 files changed, 77 insertions, 0 deletions
diff --git a/sys/amd64/include/asan.h b/sys/amd64/include/asan.h
new file mode 100644
index 000000000000..7d1d291aa06a
--- /dev/null
+++ b/sys/amd64/include/asan.h
@@ -0,0 +1,77 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2020 The FreeBSD Foundation
+ *
+ * This software was developed by Mark Johnston under sponsorship from the
+ * FreeBSD Foundation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef _MACHINE_ASAN_H_
+#define	_MACHINE_ASAN_H_
+
+#ifdef KASAN
+
+#include <vm/vm.h>
+#include <vm/pmap.h>
+#include <vm/vm_page.h>
+#include <machine/vmparam.h>
+
+static inline vm_offset_t
+kasan_md_addr_to_shad(vm_offset_t addr)
+{
+	return (((addr - VM_MIN_KERNEL_ADDRESS) >> KASAN_SHADOW_SCALE_SHIFT) +
+	    KASAN_MIN_ADDRESS);
+}
+
+static inline bool
+kasan_md_unsupported(vm_offset_t addr)
+{
+	vm_offset_t kernmin;
+
+	/*
+	 * The vm_page array is mapped at the beginning of the kernel map, but
+	 * accesses to the array are not validated for now.  Handle the fact
+	 * that KASAN must validate accesses before the vm_page array is
+	 * initialized.
+	 */
+	kernmin = vm_page_array == NULL ? VM_MIN_KERNEL_ADDRESS :
+	    (vm_offset_t)(vm_page_array + vm_page_array_size);
+	return (addr < kernmin || addr >= VM_MAX_KERNEL_ADDRESS);
+}
+
+static inline void
+kasan_md_init(void)
+{
+}
+
+static inline void
+kasan_md_init_early(vm_offset_t bootstack, size_t size)
+{
+	kasan_shadow_map(bootstack, size);
+}
+
+#endif /* KASAN */
+
+#endif /* !_MACHINE_ASAN_H_ */