mm/kasan/report_hw_tags.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * This file contains hardware tag-based KASAN specific error reporting code.
   4  *
   5  * Copyright (c) 2020 Google, Inc.
   6  * Author: Andrey Konovalov <andreyknvl@google.com>
   7  */
   8
   9 #include <linux/kasan.h>
  10 #include <linux/kernel.h>
  11 #include <linux/memory.h>
  12 #include <linux/mm.h>
  13 #include <linux/string.h>
  14 #include <linux/types.h>
  15
  16 #include "kasan.h"
  17
  18 void *kasan_find_first_bad_addr(void *addr, size_t size)
  19 {
  20         return kasan_reset_tag(addr);
  21 }
  22
  23 void kasan_metadata_fetch_row(char *buffer, void *row)
  24 {
  25         int i;
  26
  27         for (i = 0; i < META_BYTES_PER_ROW; i++)
  28                 buffer[i] = hw_get_mem_tag(row + i * KASAN_GRANULE_SIZE);
  29 }
  30
  31 void kasan_print_tags(u8 addr_tag, const void *addr)
  32 {
  33         u8 memory_tag = hw_get_mem_tag((void *)addr);
  34
  35         pr_err("Pointer tag: [%02x], memory tag: [%02x]\n",
  36                 addr_tag, memory_tag);
  37 }