1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * This file contains software tag-based KASAN specific error reporting code. 4 * 5 * Copyright (c) 2014 Samsung Electronics Co., Ltd. 6 * Author: Andrey Ryabinin <ryabinin.a.a@gmail.com> 7 * 8 * Some code borrowed from https://github.com/xairy/kasan-prototype by 9 * Andrey Konovalov <andreyknvl@gmail.com> 10 */ 11 12 #include <linux/bitops.h> 13 #include <linux/ftrace.h> 14 #include <linux/init.h> 15 #include <linux/kernel.h> 16 #include <linux/mm.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> 26 27 #include <asm/sections.h> 28 29 #include "kasan.h" 30 #include "../slab.h" 31 32 void *kasan_find_first_bad_addr(void *addr, size_t size) 33 { 34 u8 tag = get_tag(addr); 35 void *p = kasan_reset_tag(addr); 36 void *end = p + size; 37 38 while (p < end && tag == *(u8 *)kasan_mem_to_shadow(p)) 39 p += KASAN_GRANULE_SIZE; 40 return p; 41 } 42 43 void kasan_metadata_fetch_row(char *buffer, void *row) 44 { 45 memcpy(buffer, kasan_mem_to_shadow(row), META_BYTES_PER_ROW); 46 } 47 48 void kasan_print_tags(u8 addr_tag, const void *addr) 49 { 50 u8 *shadow = (u8 *)kasan_mem_to_shadow(addr); 51 52 pr_err("Pointer tag: [%02x], memory tag: [%02x]\n", addr_tag, *shadow); 53 } 54