1 // SPDX-License-Identifier: GPL-2.0
3 * This file contains software tag-based KASAN specific error reporting code.
5 * Copyright (c) 2014 Samsung Electronics Co., Ltd.
6 * Author: Andrey Ryabinin <ryabinin.a.a@gmail.com>
8 * Some code borrowed from https://github.com/xairy/kasan-prototype by
9 * Andrey Konovalov <andreyknvl@gmail.com>
12 #include <linux/bitops.h>
13 #include <linux/ftrace.h>
14 #include <linux/init.h>
15 #include <linux/kernel.h>
17 #include <linux/printk.h>
18 #include <linux/sched.h>
19 #include <linux/slab.h>
20 #include <linux/stackdepot.h>
21 #include <linux/stacktrace.h>
22 #include <linux/string.h>
23 #include <linux/types.h>
24 #include <linux/kasan.h>
25 #include <linux/module.h>
27 #include <asm/sections.h>
32 void *kasan_find_first_bad_addr(void *addr, size_t size)
34 u8 tag = get_tag(addr);
35 void *p = kasan_reset_tag(addr);
38 while (p < end && tag == *(u8 *)kasan_mem_to_shadow(p))
39 p += KASAN_GRANULE_SIZE;
43 void kasan_metadata_fetch_row(char *buffer, void *row)
45 memcpy(buffer, kasan_mem_to_shadow(row), META_BYTES_PER_ROW);
48 void kasan_print_tags(u8 addr_tag, const void *addr)
50 u8 *shadow = (u8 *)kasan_mem_to_shadow(addr);
52 pr_err("Pointer tag: [%02x], memory tag: [%02x]\n", addr_tag, *shadow);