1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2020 The FreeBSD Foundation
5 *
6 * This software was developed by Mark Johnston under sponsorship from the
7 * FreeBSD Foundation.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions are
11 * met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31 #ifndef _MACHINE_ASAN_H_
32 #define _MACHINE_ASAN_H_
33
34 #ifdef KASAN
35
36 #include <vm/vm.h>
37 #include <vm/pmap.h>
38 #include <vm/vm_page.h>
39 #include <machine/vmparam.h>
40
41 static inline vm_offset_t
kasan_md_addr_to_shad(vm_offset_t addr)42 kasan_md_addr_to_shad(vm_offset_t addr)
43 {
44 return (((addr - VM_MIN_KERNEL_ADDRESS) >> KASAN_SHADOW_SCALE_SHIFT) +
45 KASAN_MIN_ADDRESS);
46 }
47
48 static inline bool
kasan_md_unsupported(vm_offset_t addr)49 kasan_md_unsupported(vm_offset_t addr)
50 {
51 vm_offset_t kernmin;
52
53 /*
54 * The vm_page array is mapped at the beginning of the kernel map, but
55 * accesses to the array are not validated for now. Handle the fact
56 * that KASAN must validate accesses before the vm_page array is
57 * initialized.
58 */
59 kernmin = vm_page_array == NULL ? VM_MIN_KERNEL_ADDRESS :
60 (vm_offset_t)(vm_page_array + vm_page_array_size);
61 return (addr < kernmin || addr >= VM_MAX_KERNEL_ADDRESS);
62 }
63
64 static inline void
kasan_md_init(void)65 kasan_md_init(void)
66 {
67 }
68
69 static inline void
kasan_md_init_early(vm_offset_t bootstack,size_t size)70 kasan_md_init_early(vm_offset_t bootstack, size_t size)
71 {
72 kasan_shadow_map(bootstack, size);
73 }
74
75 #endif /* KASAN */
76
77 #endif /* !_MACHINE_ASAN_H_ */
78