report_sw_tags.c
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// 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);
}