1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 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 #endif /* KASAN */ 70 71 #endif /* !_MACHINE_ASAN_H_ */ 72