1 // SPDX-License-Identifier: GPL-2.0
3 * This file contains core hardware tag-based KASAN code.
5 * Copyright (c) 2020 Google, Inc.
6 * Author: Andrey Konovalov <andreyknvl@google.com>
9 #define pr_fmt(fmt) "kasan: " fmt
11 #include <linux/kasan.h>
12 #include <linux/kernel.h>
13 #include <linux/memory.h>
15 #include <linux/string.h>
16 #include <linux/types.h>
20 /* kasan_init_hw_tags_cpu() is called for each CPU. */
21 void kasan_init_hw_tags_cpu(void)
23 hw_init_tags(KASAN_TAG_MAX);
27 /* kasan_init_hw_tags() is called once on boot CPU. */
28 void __init kasan_init_hw_tags(void)
30 pr_info("KernelAddressSanitizer initialized\n");
33 void kasan_set_free_info(struct kmem_cache *cache,
36 struct kasan_alloc_meta *alloc_meta;
38 alloc_meta = kasan_get_alloc_meta(cache, object);
39 kasan_set_track(&alloc_meta->free_track[0], GFP_NOWAIT);
42 struct kasan_track *kasan_get_free_track(struct kmem_cache *cache,
45 struct kasan_alloc_meta *alloc_meta;
47 alloc_meta = kasan_get_alloc_meta(cache, object);
48 return &alloc_meta->free_track[0];