| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * This file contains hardware tag-based KASAN specific error reporting code. |
| * |
| * Copyright (c) 2020 Google, Inc. |
| * Author: Andrey Konovalov <andreyknvl@google.com> |
| */ |
| |
| #include <linux/kasan.h> |
| #include <linux/kernel.h> |
| #include <linux/memory.h> |
| #include <linux/mm.h> |
| #include <linux/string.h> |
| #include <linux/types.h> |
| |
| #include "kasan.h" |
| |
| void *kasan_find_first_bad_addr(void *addr, size_t size) |
| { |
| /* Return the same value regardless of whether addr_has_metadata(). */ |
| return kasan_reset_tag(addr); |
| } |
| |
| void kasan_metadata_fetch_row(char *buffer, void *row) |
| { |
| int i; |
| |
| for (i = 0; i < META_BYTES_PER_ROW; i++) |
| buffer[i] = hw_get_mem_tag(row + i * KASAN_GRANULE_SIZE); |
| } |
| |
| void kasan_print_tags(u8 addr_tag, const void *addr) |
| { |
| u8 memory_tag = hw_get_mem_tag((void *)addr); |
| |
| pr_err("Pointer tag: [%02x], memory tag: [%02x]\n", |
| addr_tag, memory_tag); |
| } |