| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * This file contains software tag-based KASAN specific error reporting code. |
| * |
| * Copyright (c) 2014 Samsung Electronics Co., Ltd. |
| * Author: Andrey Ryabinin <ryabinin.a.a@gmail.com> |
| * |
| * Some code borrowed from https://github.com/xairy/kasan-prototype by |
| * Andrey Konovalov <andreyknvl@gmail.com> |
| */ |
| |
| #include <linux/bitops.h> |
| #include <linux/ftrace.h> |
| #include <linux/init.h> |
| #include <linux/kernel.h> |
| #include <linux/mm.h> |
| #include <linux/printk.h> |
| #include <linux/sched.h> |
| #include <linux/slab.h> |
| #include <linux/stackdepot.h> |
| #include <linux/stacktrace.h> |
| #include <linux/string.h> |
| #include <linux/types.h> |
| #include <linux/kasan.h> |
| #include <linux/module.h> |
| |
| #include <asm/sections.h> |
| |
| #include "kasan.h" |
| #include "../slab.h" |
| |
| void *kasan_find_first_bad_addr(void *addr, size_t size) |
| { |
| u8 tag = get_tag(addr); |
| void *p = kasan_reset_tag(addr); |
| void *end = p + size; |
| |
| while (p < end && tag == *(u8 *)kasan_mem_to_shadow(p)) |
| p += KASAN_GRANULE_SIZE; |
| return p; |
| } |
| |
| void kasan_metadata_fetch_row(char *buffer, void *row) |
| { |
| memcpy(buffer, kasan_mem_to_shadow(row), META_BYTES_PER_ROW); |
| } |
| |
| void kasan_print_tags(u8 addr_tag, const void *addr) |
| { |
| u8 *shadow = (u8 *)kasan_mem_to_shadow(addr); |
| |
| pr_err("Pointer tag: [%02x], memory tag: [%02x]\n", addr_tag, *shadow); |
| } |