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author | Andrey Konovalov <andreyknvl@google.com> | 2020-12-22 12:02:10 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-12-22 12:55:08 -0800 |
commit | 2e903b91479782b7dedd869603423d77e079d3de (patch) | |
tree | 439c3543ca4d436d80fa5839f27b2aa9057572ef /mm/kasan/hw_tags.c | |
parent | 0fea6e9af889f1a4e072f5de999e07fe6859fc88 (diff) | |
download | linux-stable-2e903b91479782b7dedd869603423d77e079d3de.tar.gz linux-stable-2e903b91479782b7dedd869603423d77e079d3de.tar.bz2 linux-stable-2e903b91479782b7dedd869603423d77e079d3de.zip |
kasan, arm64: implement HW_TAGS runtime
Provide implementation of KASAN functions required for the hardware
tag-based mode. Those include core functions for memory and pointer
tagging (tags_hw.c) and bug reporting (report_tags_hw.c). Also adapt
common KASAN code to support the new mode.
Link: https://lkml.kernel.org/r/cfd0fbede579a6b66755c98c88c108e54f9c56bf.1606161801.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Reviewed-by: Alexander Potapenko <glider@google.com>
Tested-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Branislav Rankov <Branislav.Rankov@arm.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Kevin Brodsky <kevin.brodsky@arm.com>
Cc: Marco Elver <elver@google.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/kasan/hw_tags.c')
-rw-r--r-- | mm/kasan/hw_tags.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/mm/kasan/hw_tags.c b/mm/kasan/hw_tags.c new file mode 100644 index 000000000000..66419e908e21 --- /dev/null +++ b/mm/kasan/hw_tags.c @@ -0,0 +1,80 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * This file contains core hardware tag-based KASAN code. + * + * Copyright (c) 2020 Google, Inc. + * Author: Andrey Konovalov <andreyknvl@google.com> + */ + +#define pr_fmt(fmt) "kasan: " fmt + +#include <linux/kasan.h> +#include <linux/kernel.h> +#include <linux/memory.h> +#include <linux/mm.h> +#include <linux/string.h> +#include <linux/types.h> + +#include "kasan.h" + +/* kasan_init_hw_tags_cpu() is called for each CPU. */ +void kasan_init_hw_tags_cpu(void) +{ + hw_init_tags(KASAN_TAG_MAX); + hw_enable_tagging(); +} + +/* kasan_init_hw_tags() is called once on boot CPU. */ +void __init kasan_init_hw_tags(void) +{ + pr_info("KernelAddressSanitizer initialized\n"); +} + +void *kasan_reset_tag(const void *addr) +{ + return reset_tag(addr); +} + +void poison_range(const void *address, size_t size, u8 value) +{ + hw_set_mem_tag_range(reset_tag(address), + round_up(size, KASAN_GRANULE_SIZE), value); +} + +void unpoison_range(const void *address, size_t size) +{ + hw_set_mem_tag_range(reset_tag(address), + round_up(size, KASAN_GRANULE_SIZE), get_tag(address)); +} + +u8 random_tag(void) +{ + return hw_get_random_tag(); +} + +bool check_invalid_free(void *addr) +{ + u8 ptr_tag = get_tag(addr); + u8 mem_tag = hw_get_mem_tag(addr); + + return (mem_tag == KASAN_TAG_INVALID) || + (ptr_tag != KASAN_TAG_KERNEL && ptr_tag != mem_tag); +} + +void kasan_set_free_info(struct kmem_cache *cache, + void *object, u8 tag) +{ + struct kasan_alloc_meta *alloc_meta; + + alloc_meta = get_alloc_info(cache, object); + kasan_set_track(&alloc_meta->free_track[0], GFP_NOWAIT); +} + +struct kasan_track *kasan_get_free_track(struct kmem_cache *cache, + void *object, u8 tag) +{ + struct kasan_alloc_meta *alloc_meta; + + alloc_meta = get_alloc_info(cache, object); + return &alloc_meta->free_track[0]; +} |