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a0503b8a0b
1. Move kasan_get_free_track() and kasan_set_free_info() into tags.c and combine these two functions for SW_TAGS and HW_TAGS kasan mode. 2. Move kasan_get_bug_type() to report_tags.c and make this function compatible for SW_TAGS and HW_TAGS kasan mode. Link: https://lkml.kernel.org/r/20210626100931.22794-3-Kuan-Ying.Lee@mediatek.com Signed-off-by: Kuan-Ying Lee <Kuan-Ying.Lee@mediatek.com> Suggested-by: Marco Elver <elver@google.com> Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com> Reviewed-by: Marco Elver <elver@google.com> Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com> Cc: Alexander Potapenko <glider@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Chinwen Chang <chinwen.chang@mediatek.com> Cc: Matthias Brugger <matthias.bgg@gmail.com> Cc: Nicholas Tang <nicholas.tang@mediatek.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
59 lines
1.3 KiB
C
59 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* This file contains common tag-based KASAN code.
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*
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* Copyright (c) 2018 Google, Inc.
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* Copyright (c) 2020 Google, Inc.
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*/
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#include <linux/init.h>
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#include <linux/kasan.h>
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#include <linux/kernel.h>
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#include <linux/memory.h>
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#include <linux/mm.h>
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#include <linux/static_key.h>
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#include <linux/string.h>
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#include <linux/types.h>
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#include "kasan.h"
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void kasan_set_free_info(struct kmem_cache *cache,
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void *object, u8 tag)
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{
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struct kasan_alloc_meta *alloc_meta;
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u8 idx = 0;
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alloc_meta = kasan_get_alloc_meta(cache, object);
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if (!alloc_meta)
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return;
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#ifdef CONFIG_KASAN_TAGS_IDENTIFY
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idx = alloc_meta->free_track_idx;
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alloc_meta->free_pointer_tag[idx] = tag;
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alloc_meta->free_track_idx = (idx + 1) % KASAN_NR_FREE_STACKS;
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#endif
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kasan_set_track(&alloc_meta->free_track[idx], GFP_NOWAIT);
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}
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struct kasan_track *kasan_get_free_track(struct kmem_cache *cache,
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void *object, u8 tag)
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{
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struct kasan_alloc_meta *alloc_meta;
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int i = 0;
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alloc_meta = kasan_get_alloc_meta(cache, object);
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if (!alloc_meta)
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return NULL;
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#ifdef CONFIG_KASAN_TAGS_IDENTIFY
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for (i = 0; i < KASAN_NR_FREE_STACKS; i++) {
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if (alloc_meta->free_pointer_tag[i] == tag)
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break;
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}
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if (i == KASAN_NR_FREE_STACKS)
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i = alloc_meta->free_track_idx;
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#endif
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return &alloc_meta->free_track[i];
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}
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