+ kasan-rename-kasan_shadow_-to-kasan_granule_.patch added to -mm tree

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The patch titled
     Subject: kasan: rename KASAN_SHADOW_* to KASAN_GRANULE_*
has been added to the -mm tree.  Its filename is
     kasan-rename-kasan_shadow_-to-kasan_granule_.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/kasan-rename-kasan_shadow_-to-kasan_granule_.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/kasan-rename-kasan_shadow_-to-kasan_granule_.patch

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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next and is updated
there every 3-4 working days

------------------------------------------------------
From: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Subject: kasan: rename KASAN_SHADOW_* to KASAN_GRANULE_*

This is a preparatory commit for the upcoming addition of a new hardware
tag-based (MTE-based) KASAN mode.

The new mode won't be using shadow memory, but will still use the concept
of memory granules. Each memory granule maps to a single metadata entry:
8 bytes per one shadow byte for generic mode, 16 bytes per one shadow byte
for software tag-based mode, and 16 bytes per one allocation tag for
hardware tag-based mode.

Rename KASAN_SHADOW_SCALE_SIZE to KASAN_GRANULE_SIZE, and KASAN_SHADOW_MASK
to KASAN_GRANULE_MASK.

Also use MASK when used as a mask, otherwise use SIZE.

No functional changes.

Link: https://lkml.kernel.org/r/29bbfde90235ab7ac985e8bae79866cf885e4a29.1605046192.git.andreyknvl@xxxxxxxxxx
Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@xxxxxxx>
Reviewed-by: Marco Elver <elver@xxxxxxxxxx>
Cc: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Cc: Branislav Rankov <Branislav.Rankov@xxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Evgenii Stepanov <eugenis@xxxxxxxxxx>
Cc: Kevin Brodsky <kevin.brodsky@xxxxxxx>
Cc: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 Documentation/dev-tools/kasan.rst |    2 -
 lib/test_kasan.c                  |    2 -
 lib/test_kasan_module.c           |    2 -
 mm/kasan/common.c                 |   39 ++++++++++++++--------------
 mm/kasan/generic.c                |   14 +++++-----
 mm/kasan/generic_report.c         |    8 ++---
 mm/kasan/init.c                   |    8 ++---
 mm/kasan/kasan.h                  |    4 +-
 mm/kasan/report.c                 |   10 +++----
 mm/kasan/tags_report.c            |    2 -
 10 files changed, 46 insertions(+), 45 deletions(-)

--- a/Documentation/dev-tools/kasan.rst~kasan-rename-kasan_shadow_-to-kasan_granule_
+++ a/Documentation/dev-tools/kasan.rst
@@ -264,7 +264,7 @@ Most mappings in vmalloc space are small
 page of shadow space. Allocating a full shadow page per mapping would
 therefore be wasteful. Furthermore, to ensure that different mappings
 use different shadow pages, mappings would have to be aligned to
-``KASAN_SHADOW_SCALE_SIZE * PAGE_SIZE``.
+``KASAN_GRANULE_SIZE * PAGE_SIZE``.
 
 Instead, we share backing space across multiple mappings. We allocate
 a backing page when a mapping in vmalloc space uses a particular page
--- a/lib/test_kasan.c~kasan-rename-kasan_shadow_-to-kasan_granule_
+++ a/lib/test_kasan.c
@@ -25,7 +25,7 @@
 
 #include "../mm/kasan/kasan.h"
 
-#define OOB_TAG_OFF (IS_ENABLED(CONFIG_KASAN_GENERIC) ? 0 : KASAN_SHADOW_SCALE_SIZE)
+#define OOB_TAG_OFF (IS_ENABLED(CONFIG_KASAN_GENERIC) ? 0 : KASAN_GRANULE_SIZE)
 
 /*
  * We assign some test results to these globals to make sure the tests
--- a/lib/test_kasan_module.c~kasan-rename-kasan_shadow_-to-kasan_granule_
+++ a/lib/test_kasan_module.c
@@ -15,7 +15,7 @@
 
 #include "../mm/kasan/kasan.h"
 
-#define OOB_TAG_OFF (IS_ENABLED(CONFIG_KASAN_GENERIC) ? 0 : KASAN_SHADOW_SCALE_SIZE)
+#define OOB_TAG_OFF (IS_ENABLED(CONFIG_KASAN_GENERIC) ? 0 : KASAN_GRANULE_SIZE)
 
 static noinline void __init copy_user_test(void)
 {
--- a/mm/kasan/common.c~kasan-rename-kasan_shadow_-to-kasan_granule_
+++ a/mm/kasan/common.c
@@ -107,7 +107,7 @@ void *memcpy(void *dest, const void *src
 
 /*
  * Poisons the shadow memory for 'size' bytes starting from 'addr'.
- * Memory addresses should be aligned to KASAN_SHADOW_SCALE_SIZE.
+ * Memory addresses should be aligned to KASAN_GRANULE_SIZE.
  */
 void kasan_poison_memory(const void *address, size_t size, u8 value)
 {
@@ -151,13 +151,13 @@ void kasan_unpoison_memory(const void *a
 
 	kasan_poison_memory(address, size, tag);
 
-	if (size & KASAN_SHADOW_MASK) {
+	if (size & KASAN_GRANULE_MASK) {
 		u8 *shadow = (u8 *)kasan_mem_to_shadow(address + size);
 
 		if (IS_ENABLED(CONFIG_KASAN_SW_TAGS))
 			*shadow = tag;
 		else
-			*shadow = size & KASAN_SHADOW_MASK;
+			*shadow = size & KASAN_GRANULE_MASK;
 	}
 }
 
@@ -309,7 +309,7 @@ void kasan_unpoison_object_data(struct k
 void kasan_poison_object_data(struct kmem_cache *cache, void *object)
 {
 	kasan_poison_memory(object,
-			round_up(cache->object_size, KASAN_SHADOW_SCALE_SIZE),
+			round_up(cache->object_size, KASAN_GRANULE_SIZE),
 			KASAN_KMALLOC_REDZONE);
 }
 
@@ -381,7 +381,7 @@ static inline bool shadow_invalid(u8 tag
 {
 	if (IS_ENABLED(CONFIG_KASAN_GENERIC))
 		return shadow_byte < 0 ||
-			shadow_byte >= KASAN_SHADOW_SCALE_SIZE;
+			shadow_byte >= KASAN_GRANULE_SIZE;
 
 	/* else CONFIG_KASAN_SW_TAGS: */
 	if ((u8)shadow_byte == KASAN_TAG_INVALID)
@@ -423,7 +423,7 @@ static bool __kasan_slab_free(struct kme
 		return true;
 	}
 
-	rounded_up_size = round_up(cache->object_size, KASAN_SHADOW_SCALE_SIZE);
+	rounded_up_size = round_up(cache->object_size, KASAN_GRANULE_SIZE);
 	kasan_poison_memory(object, rounded_up_size, KASAN_KMALLOC_FREE);
 
 	if ((IS_ENABLED(CONFIG_KASAN_GENERIC) && !quarantine) ||
@@ -459,9 +459,9 @@ static void *__kasan_kmalloc(struct kmem
 		return (void *)object;
 
 	redzone_start = round_up((unsigned long)(object + size),
-				KASAN_SHADOW_SCALE_SIZE);
+				KASAN_GRANULE_SIZE);
 	redzone_end = round_up((unsigned long)object + cache->object_size,
-				KASAN_SHADOW_SCALE_SIZE);
+				KASAN_GRANULE_SIZE);
 
 	if (IS_ENABLED(CONFIG_KASAN_SW_TAGS))
 		tag = assign_tag(cache, object, false, keep_tag);
@@ -505,7 +505,7 @@ void * __must_check kasan_kmalloc_large(
 
 	page = virt_to_page(ptr);
 	redzone_start = round_up((unsigned long)(ptr + size),
-				KASAN_SHADOW_SCALE_SIZE);
+				KASAN_GRANULE_SIZE);
 	redzone_end = (unsigned long)ptr + page_size(page);
 
 	kasan_unpoison_memory(ptr, size);
@@ -603,8 +603,8 @@ static int __meminit kasan_mem_notifier(
 	shadow_size = nr_shadow_pages << PAGE_SHIFT;
 	shadow_end = shadow_start + shadow_size;
 
-	if (WARN_ON(mem_data->nr_pages % KASAN_SHADOW_SCALE_SIZE) ||
-		WARN_ON(start_kaddr % (KASAN_SHADOW_SCALE_SIZE << PAGE_SHIFT)))
+	if (WARN_ON(mem_data->nr_pages % KASAN_GRANULE_SIZE) ||
+		WARN_ON(start_kaddr % (KASAN_GRANULE_SIZE << PAGE_SHIFT)))
 		return NOTIFY_BAD;
 
 	switch (action) {
@@ -762,7 +762,7 @@ void kasan_poison_vmalloc(const void *st
 	if (!is_vmalloc_or_module_addr(start))
 		return;
 
-	size = round_up(size, KASAN_SHADOW_SCALE_SIZE);
+	size = round_up(size, KASAN_GRANULE_SIZE);
 	kasan_poison_memory(start, size, KASAN_VMALLOC_INVALID);
 }
 
@@ -875,22 +875,22 @@ void kasan_release_vmalloc(unsigned long
 	unsigned long region_start, region_end;
 	unsigned long size;
 
-	region_start = ALIGN(start, PAGE_SIZE * KASAN_SHADOW_SCALE_SIZE);
-	region_end = ALIGN_DOWN(end, PAGE_SIZE * KASAN_SHADOW_SCALE_SIZE);
+	region_start = ALIGN(start, PAGE_SIZE * KASAN_GRANULE_SIZE);
+	region_end = ALIGN_DOWN(end, PAGE_SIZE * KASAN_GRANULE_SIZE);
 
 	free_region_start = ALIGN(free_region_start,
-				  PAGE_SIZE * KASAN_SHADOW_SCALE_SIZE);
+				  PAGE_SIZE * KASAN_GRANULE_SIZE);
 
 	if (start != region_start &&
 	    free_region_start < region_start)
-		region_start -= PAGE_SIZE * KASAN_SHADOW_SCALE_SIZE;
+		region_start -= PAGE_SIZE * KASAN_GRANULE_SIZE;
 
 	free_region_end = ALIGN_DOWN(free_region_end,
-				     PAGE_SIZE * KASAN_SHADOW_SCALE_SIZE);
+				     PAGE_SIZE * KASAN_GRANULE_SIZE);
 
 	if (end != region_end &&
 	    free_region_end > region_end)
-		region_end += PAGE_SIZE * KASAN_SHADOW_SCALE_SIZE;
+		region_end += PAGE_SIZE * KASAN_GRANULE_SIZE;
 
 	shadow_start = kasan_mem_to_shadow((void *)region_start);
 	shadow_end = kasan_mem_to_shadow((void *)region_end);
@@ -916,7 +916,8 @@ int kasan_module_alloc(void *addr, size_
 	unsigned long shadow_start;
 
 	shadow_start = (unsigned long)kasan_mem_to_shadow(addr);
-	scaled_size = (size + KASAN_SHADOW_MASK) >> KASAN_SHADOW_SCALE_SHIFT;
+	scaled_size = (size + KASAN_GRANULE_SIZE - 1) >>
+				KASAN_SHADOW_SCALE_SHIFT;
 	shadow_size = round_up(scaled_size, PAGE_SIZE);
 
 	if (WARN_ON(!PAGE_ALIGNED(shadow_start)))
--- a/mm/kasan/generic.c~kasan-rename-kasan_shadow_-to-kasan_granule_
+++ a/mm/kasan/generic.c
@@ -47,7 +47,7 @@ static __always_inline bool memory_is_po
 	s8 shadow_value = *(s8 *)kasan_mem_to_shadow((void *)addr);
 
 	if (unlikely(shadow_value)) {
-		s8 last_accessible_byte = addr & KASAN_SHADOW_MASK;
+		s8 last_accessible_byte = addr & KASAN_GRANULE_MASK;
 		return unlikely(last_accessible_byte >= shadow_value);
 	}
 
@@ -63,7 +63,7 @@ static __always_inline bool memory_is_po
 	 * Access crosses 8(shadow size)-byte boundary. Such access maps
 	 * into 2 shadow bytes, so we need to check them both.
 	 */
-	if (unlikely(((addr + size - 1) & KASAN_SHADOW_MASK) < size - 1))
+	if (unlikely(((addr + size - 1) & KASAN_GRANULE_MASK) < size - 1))
 		return *shadow_addr || memory_is_poisoned_1(addr + size - 1);
 
 	return memory_is_poisoned_1(addr + size - 1);
@@ -74,7 +74,7 @@ static __always_inline bool memory_is_po
 	u16 *shadow_addr = (u16 *)kasan_mem_to_shadow((void *)addr);
 
 	/* Unaligned 16-bytes access maps into 3 shadow bytes. */
-	if (unlikely(!IS_ALIGNED(addr, KASAN_SHADOW_SCALE_SIZE)))
+	if (unlikely(!IS_ALIGNED(addr, KASAN_GRANULE_SIZE)))
 		return *shadow_addr || memory_is_poisoned_1(addr + 15);
 
 	return *shadow_addr;
@@ -135,7 +135,7 @@ static __always_inline bool memory_is_po
 		s8 *last_shadow = (s8 *)kasan_mem_to_shadow((void *)last_byte);
 
 		if (unlikely(ret != (unsigned long)last_shadow ||
-			((long)(last_byte & KASAN_SHADOW_MASK) >= *last_shadow)))
+			((long)(last_byte & KASAN_GRANULE_MASK) >= *last_shadow)))
 			return true;
 	}
 	return false;
@@ -201,7 +201,7 @@ void kasan_cache_shutdown(struct kmem_ca
 
 static void register_global(struct kasan_global *global)
 {
-	size_t aligned_size = round_up(global->size, KASAN_SHADOW_SCALE_SIZE);
+	size_t aligned_size = round_up(global->size, KASAN_GRANULE_SIZE);
 
 	kasan_unpoison_memory(global->beg, global->size);
 
@@ -275,10 +275,10 @@ EXPORT_SYMBOL(__asan_handle_no_return);
 /* Emitted by compiler to poison alloca()ed objects. */
 void __asan_alloca_poison(unsigned long addr, size_t size)
 {
-	size_t rounded_up_size = round_up(size, KASAN_SHADOW_SCALE_SIZE);
+	size_t rounded_up_size = round_up(size, KASAN_GRANULE_SIZE);
 	size_t padding_size = round_up(size, KASAN_ALLOCA_REDZONE_SIZE) -
 			rounded_up_size;
-	size_t rounded_down_size = round_down(size, KASAN_SHADOW_SCALE_SIZE);
+	size_t rounded_down_size = round_down(size, KASAN_GRANULE_SIZE);
 
 	const void *left_redzone = (const void *)(addr -
 			KASAN_ALLOCA_REDZONE_SIZE);
--- a/mm/kasan/generic_report.c~kasan-rename-kasan_shadow_-to-kasan_granule_
+++ a/mm/kasan/generic_report.c
@@ -34,7 +34,7 @@ void *find_first_bad_addr(void *addr, si
 	void *p = addr;
 
 	while (p < addr + size && !(*(u8 *)kasan_mem_to_shadow(p)))
-		p += KASAN_SHADOW_SCALE_SIZE;
+		p += KASAN_GRANULE_SIZE;
 	return p;
 }
 
@@ -46,14 +46,14 @@ static const char *get_shadow_bug_type(s
 	shadow_addr = (u8 *)kasan_mem_to_shadow(info->first_bad_addr);
 
 	/*
-	 * If shadow byte value is in [0, KASAN_SHADOW_SCALE_SIZE) we can look
+	 * If shadow byte value is in [0, KASAN_GRANULE_SIZE) we can look
 	 * at the next shadow byte to determine the type of the bad access.
 	 */
-	if (*shadow_addr > 0 && *shadow_addr <= KASAN_SHADOW_SCALE_SIZE - 1)
+	if (*shadow_addr > 0 && *shadow_addr <= KASAN_GRANULE_SIZE - 1)
 		shadow_addr++;
 
 	switch (*shadow_addr) {
-	case 0 ... KASAN_SHADOW_SCALE_SIZE - 1:
+	case 0 ... KASAN_GRANULE_SIZE - 1:
 		/*
 		 * In theory it's still possible to see these shadow values
 		 * due to a data race in the kernel code.
--- a/mm/kasan/init.c~kasan-rename-kasan_shadow_-to-kasan_granule_
+++ a/mm/kasan/init.c
@@ -442,8 +442,8 @@ void kasan_remove_zero_shadow(void *star
 	end = addr + (size >> KASAN_SHADOW_SCALE_SHIFT);
 
 	if (WARN_ON((unsigned long)start %
-			(KASAN_SHADOW_SCALE_SIZE * PAGE_SIZE)) ||
-	    WARN_ON(size % (KASAN_SHADOW_SCALE_SIZE * PAGE_SIZE)))
+			(KASAN_GRANULE_SIZE * PAGE_SIZE)) ||
+	    WARN_ON(size % (KASAN_GRANULE_SIZE * PAGE_SIZE)))
 		return;
 
 	for (; addr < end; addr = next) {
@@ -477,8 +477,8 @@ int kasan_add_zero_shadow(void *start, u
 	shadow_end = shadow_start + (size >> KASAN_SHADOW_SCALE_SHIFT);
 
 	if (WARN_ON((unsigned long)start %
-			(KASAN_SHADOW_SCALE_SIZE * PAGE_SIZE)) ||
-	    WARN_ON(size % (KASAN_SHADOW_SCALE_SIZE * PAGE_SIZE)))
+			(KASAN_GRANULE_SIZE * PAGE_SIZE)) ||
+	    WARN_ON(size % (KASAN_GRANULE_SIZE * PAGE_SIZE)))
 		return -EINVAL;
 
 	ret = kasan_populate_early_shadow(shadow_start, shadow_end);
--- a/mm/kasan/kasan.h~kasan-rename-kasan_shadow_-to-kasan_granule_
+++ a/mm/kasan/kasan.h
@@ -5,8 +5,8 @@
 #include <linux/kasan.h>
 #include <linux/stackdepot.h>
 
-#define KASAN_SHADOW_SCALE_SIZE (1UL << KASAN_SHADOW_SCALE_SHIFT)
-#define KASAN_SHADOW_MASK       (KASAN_SHADOW_SCALE_SIZE - 1)
+#define KASAN_GRANULE_SIZE	(1UL << KASAN_SHADOW_SCALE_SHIFT)
+#define KASAN_GRANULE_MASK	(KASAN_GRANULE_SIZE - 1)
 
 #define KASAN_TAG_KERNEL	0xFF /* native kernel pointers tag */
 #define KASAN_TAG_INVALID	0xFE /* inaccessible memory tag */
--- a/mm/kasan/report.c~kasan-rename-kasan_shadow_-to-kasan_granule_
+++ a/mm/kasan/report.c
@@ -314,24 +314,24 @@ static bool __must_check get_address_sta
 		return false;
 
 	aligned_addr = round_down((unsigned long)addr, sizeof(long));
-	mem_ptr = round_down(aligned_addr, KASAN_SHADOW_SCALE_SIZE);
+	mem_ptr = round_down(aligned_addr, KASAN_GRANULE_SIZE);
 	shadow_ptr = kasan_mem_to_shadow((void *)aligned_addr);
 	shadow_bottom = kasan_mem_to_shadow(end_of_stack(current));
 
 	while (shadow_ptr >= shadow_bottom && *shadow_ptr != KASAN_STACK_LEFT) {
 		shadow_ptr--;
-		mem_ptr -= KASAN_SHADOW_SCALE_SIZE;
+		mem_ptr -= KASAN_GRANULE_SIZE;
 	}
 
 	while (shadow_ptr >= shadow_bottom && *shadow_ptr == KASAN_STACK_LEFT) {
 		shadow_ptr--;
-		mem_ptr -= KASAN_SHADOW_SCALE_SIZE;
+		mem_ptr -= KASAN_GRANULE_SIZE;
 	}
 
 	if (shadow_ptr < shadow_bottom)
 		return false;
 
-	frame = (const unsigned long *)(mem_ptr + KASAN_SHADOW_SCALE_SIZE);
+	frame = (const unsigned long *)(mem_ptr + KASAN_GRANULE_SIZE);
 	if (frame[0] != KASAN_CURRENT_STACK_FRAME_MAGIC) {
 		pr_err("KASAN internal error: frame info validation failed; invalid marker: %lu\n",
 		       frame[0]);
@@ -599,6 +599,6 @@ void kasan_non_canonical_hook(unsigned l
 	else
 		bug_type = "maybe wild-memory-access";
 	pr_alert("KASAN: %s in range [0x%016lx-0x%016lx]\n", bug_type,
-		 orig_addr, orig_addr + KASAN_SHADOW_MASK);
+		 orig_addr, orig_addr + KASAN_GRANULE_SIZE - 1);
 }
 #endif
--- a/mm/kasan/tags_report.c~kasan-rename-kasan_shadow_-to-kasan_granule_
+++ a/mm/kasan/tags_report.c
@@ -76,7 +76,7 @@ void *find_first_bad_addr(void *addr, si
 	void *end = p + size;
 
 	while (p < end && tag == *(u8 *)kasan_mem_to_shadow(p))
-		p += KASAN_SHADOW_SCALE_SIZE;
+		p += KASAN_GRANULE_SIZE;
 	return p;
 }
 
_

Patches currently in -mm which might be from andreyknvl@xxxxxxxxxx are

kasan-drop-unnecessary-gpl-text-from-comment-headers.patch
kasan-kasan_vmalloc-depends-on-kasan_generic.patch
kasan-group-vmalloc-code.patch
s390-kasan-include-asm-pageh-from-asm-kasanh.patch
kasan-shadow-declarations-only-for-software-modes.patch
kasan-rename-unpoison_shadow-to-unpoison_memory.patch
kasan-rename-kasan_shadow_-to-kasan_granule_.patch
kasan-only-build-initc-for-software-modes.patch
kasan-split-out-shadowc-from-commonc.patch
kasan-define-kasan_granule_page.patch
kasan-rename-report-and-tags-files.patch
kasan-dont-duplicate-config-dependencies.patch
kasan-hide-invalid-free-check-implementation.patch
kasan-decode-stack-frame-only-with-kasan_stack_enable.patch
kasan-arm64-only-init-shadow-for-software-modes.patch
kasan-arm64-only-use-kasan_depth-for-software-modes.patch
kasan-arm64-move-initialization-message.patch
kasan-arm64-rename-kasan_init_tags-and-mark-as-__init.patch
kasan-rename-addr_has_shadow-to-addr_has_metadata.patch
kasan-rename-print_shadow_for_address-to-print_memory_metadata.patch
kasan-kasan_non_canonical_hook-only-for-software-modes.patch
kasan-rename-shadow-layout-macros-to-meta.patch
kasan-separate-metadata_fetch_row-for-each-mode.patch
kasan-arm64-dont-allow-sw_tags-with-arm64_mte.patch
kasan-introduce-config_kasan_hw_tags.patch
arm64-kasan-align-allocations-for-hw_tags.patch
arm64-kasan-add-arch-layer-for-memory-tagging-helpers.patch
kasan-define-kasan_granule_size-for-hw_tags.patch
kasan-x86-s390-update-undef-config_kasan.patch
kasan-arm64-expand-config_kasan-checks.patch
kasan-arm64-implement-hw_tags-runtime.patch
kasan-arm64-print-report-from-tag-fault-handler.patch
kasan-mm-reset-tags-when-accessing-metadata.patch
kasan-arm64-enable-config_kasan_hw_tags.patch
kasan-add-documentation-for-hardware-tag-based-mode.patch




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