1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * This file contains hardware tag-based KASAN specific error reporting code. 4 * 5 * Copyright (c) 2020 Google, Inc. 6 * Author: Andrey Konovalov <andreyknvl@google.com> 7 */ 8 9 #include <linux/kasan.h> 10 #include <linux/kernel.h> 11 #include <linux/memory.h> 12 #include <linux/mm.h> 13 #include <linux/string.h> 14 #include <linux/types.h> 15 16 #include "kasan.h" 17 18 void *kasan_find_first_bad_addr(void *addr, size_t size) 19 { 20 /* Return the same value regardless of whether addr_has_metadata(). */ 21 return kasan_reset_tag(addr); 22 } 23 24 void kasan_metadata_fetch_row(char *buffer, void *row) 25 { 26 int i; 27 28 for (i = 0; i < META_BYTES_PER_ROW; i++) 29 buffer[i] = hw_get_mem_tag(row + i * KASAN_GRANULE_SIZE); 30 } 31 32 void kasan_print_tags(u8 addr_tag, const void *addr) 33 { 34 u8 memory_tag = hw_get_mem_tag((void *)addr); 35 36 pr_err("Pointer tag: [%02x], memory tag: [%02x]\n", 37 addr_tag, memory_tag); 38 } 39