| 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 |
| 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 |
| 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 |
| 65 | kasan_md_init(void) |
| 66 | { |
| 67 | } |
| 68 | |
| 69 | static inline void |
| 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_ */ |