The patch titled
Subject: kasan: define KASAN_MEMORY_PER_SHADOW_PAGE
has been added to the -mm tree. Its filename is
kasan-define-kasan_memory_per_shadow_page.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/kasan-define-kasan_memory_per_shadow_page.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/kasan-define-kasan_memory_per_shadow_page.patch
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------------------------------------------------------
From: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Subject: kasan: define KASAN_MEMORY_PER_SHADOW_PAGE
Define KASAN_MEMORY_PER_SHADOW_PAGE as (KASAN_GRANULE_SIZE << PAGE_SHIFT),
which is the same as (KASAN_GRANULE_SIZE * PAGE_SIZE) for software modes
that use shadow memory, and use it across KASAN code to simplify it.
Link: https://lkml.kernel.org/r/8329391cfe14b5cffd3decf3b5c535b6ce21eef6.1606161801.git.andreyknvl@xxxxxxxxxx
Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@xxxxxxx>
Reviewed-by: Marco Elver <elver@xxxxxxxxxx>
Reviewed-by: Alexander Potapenko <glider@xxxxxxxxxx>
Tested-by: Vincenzo Frascino <vincenzo.frascino@xxxxxxx>
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>
---
mm/kasan/init.c | 10 ++++------
mm/kasan/kasan.h | 2 ++
mm/kasan/shadow.c | 16 +++++++---------
3 files changed, 13 insertions(+), 15 deletions(-)
--- a/mm/kasan/init.c~kasan-define-kasan_memory_per_shadow_page
+++ a/mm/kasan/init.c
@@ -441,9 +441,8 @@ void kasan_remove_zero_shadow(void *star
addr = (unsigned long)kasan_mem_to_shadow(start);
end = addr + (size >> KASAN_SHADOW_SCALE_SHIFT);
- if (WARN_ON((unsigned long)start %
- (KASAN_GRANULE_SIZE * PAGE_SIZE)) ||
- WARN_ON(size % (KASAN_GRANULE_SIZE * PAGE_SIZE)))
+ if (WARN_ON((unsigned long)start % KASAN_MEMORY_PER_SHADOW_PAGE) ||
+ WARN_ON(size % KASAN_MEMORY_PER_SHADOW_PAGE))
return;
for (; addr < end; addr = next) {
@@ -476,9 +475,8 @@ int kasan_add_zero_shadow(void *start, u
shadow_start = kasan_mem_to_shadow(start);
shadow_end = shadow_start + (size >> KASAN_SHADOW_SCALE_SHIFT);
- if (WARN_ON((unsigned long)start %
- (KASAN_GRANULE_SIZE * PAGE_SIZE)) ||
- WARN_ON(size % (KASAN_GRANULE_SIZE * PAGE_SIZE)))
+ if (WARN_ON((unsigned long)start % KASAN_MEMORY_PER_SHADOW_PAGE) ||
+ WARN_ON(size % KASAN_MEMORY_PER_SHADOW_PAGE))
return -EINVAL;
ret = kasan_populate_early_shadow(shadow_start, shadow_end);
--- a/mm/kasan/kasan.h~kasan-define-kasan_memory_per_shadow_page
+++ a/mm/kasan/kasan.h
@@ -8,6 +8,8 @@
#define KASAN_GRANULE_SIZE (1UL << KASAN_SHADOW_SCALE_SHIFT)
#define KASAN_GRANULE_MASK (KASAN_GRANULE_SIZE - 1)
+#define KASAN_MEMORY_PER_SHADOW_PAGE (KASAN_GRANULE_SIZE << PAGE_SHIFT)
+
#define KASAN_TAG_KERNEL 0xFF /* native kernel pointers tag */
#define KASAN_TAG_INVALID 0xFE /* inaccessible memory tag */
#define KASAN_TAG_MAX 0xFD /* maximum value for random tags */
--- a/mm/kasan/shadow.c~kasan-define-kasan_memory_per_shadow_page
+++ a/mm/kasan/shadow.c
@@ -174,7 +174,7 @@ static int __meminit kasan_mem_notifier(
shadow_end = shadow_start + shadow_size;
if (WARN_ON(mem_data->nr_pages % KASAN_GRANULE_SIZE) ||
- WARN_ON(start_kaddr % (KASAN_GRANULE_SIZE << PAGE_SHIFT)))
+ WARN_ON(start_kaddr % KASAN_MEMORY_PER_SHADOW_PAGE))
return NOTIFY_BAD;
switch (action) {
@@ -445,22 +445,20 @@ void kasan_release_vmalloc(unsigned long
unsigned long region_start, region_end;
unsigned long size;
- region_start = ALIGN(start, PAGE_SIZE * KASAN_GRANULE_SIZE);
- region_end = ALIGN_DOWN(end, PAGE_SIZE * KASAN_GRANULE_SIZE);
+ region_start = ALIGN(start, KASAN_MEMORY_PER_SHADOW_PAGE);
+ region_end = ALIGN_DOWN(end, KASAN_MEMORY_PER_SHADOW_PAGE);
- free_region_start = ALIGN(free_region_start,
- PAGE_SIZE * KASAN_GRANULE_SIZE);
+ free_region_start = ALIGN(free_region_start, KASAN_MEMORY_PER_SHADOW_PAGE);
if (start != region_start &&
free_region_start < region_start)
- region_start -= PAGE_SIZE * KASAN_GRANULE_SIZE;
+ region_start -= KASAN_MEMORY_PER_SHADOW_PAGE;
- free_region_end = ALIGN_DOWN(free_region_end,
- PAGE_SIZE * KASAN_GRANULE_SIZE);
+ free_region_end = ALIGN_DOWN(free_region_end, KASAN_MEMORY_PER_SHADOW_PAGE);
if (end != region_end &&
free_region_end > region_end)
- region_end += PAGE_SIZE * KASAN_GRANULE_SIZE;
+ region_end += KASAN_MEMORY_PER_SHADOW_PAGE;
shadow_start = kasan_mem_to_shadow((void *)region_start);
shadow_end = kasan_mem_to_shadow((void *)region_end);
_
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
kasan-shadow-declarations-only-for-software-modes.patch
kasan-rename-unpoison_shadow-to-unpoison_range.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_memory_per_shadow_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-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
kasan-simplify-quarantine_put-call-site.patch
kasan-rename-get_alloc-free_info.patch
kasan-introduce-set_alloc_info.patch
kasan-arm64-unpoison-stack-only-with-config_kasan_stack.patch
kasan-allow-vmap_stack-for-hw_tags-mode.patch
kasan-remove-__kasan_unpoison_stack.patch
kasan-inline-kasan_reset_tag-for-tag-based-modes.patch
kasan-inline-random_tag-for-hw_tags.patch
kasan-open-code-kasan_unpoison_slab.patch
kasan-inline-unpoison_range-and-check_invalid_free.patch
kasan-add-and-integrate-kasan-boot-parameters.patch
kasan-mm-check-kasan_enabled-in-annotations.patch
kasan-mm-rename-kasan_poison_kfree.patch
kasan-dont-round_up-too-much.patch
kasan-simplify-assign_tag-and-set_tag-calls.patch
kasan-clarify-comment-in-__kasan_kfree_large.patch
kasan-sanitize-objects-when-metadata-doesnt-fit.patch
kasan-mm-allow-cache-merging-with-no-metadata.patch
kasan-update-documentation.patch
