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kasan: don't round_up too much

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For hardware tag-based mode kasan_poison_memory() already rounds up the
size. Do the same for software modes and remove round_up() from the common
code.

Link: https://lkml.kernel.org/r/47b232474f1f89dc072aeda0fa58daa6efade377.1606162397.git.andreyknvl@google.com
Link: https://linux-review.googlesource.com/id/Ib397128fac6eba874008662b4964d65352db4aa4
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Reviewed-by: Marco Elver <elver@google.com>
Tested-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Branislav Rankov <Branislav.Rankov@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Kevin Brodsky <kevin.brodsky@arm.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>
This commit is contained in:
Andrey Konovalov 2020-12-22 12:03:17 -08:00 committed by Linus Torvalds
parent eeb3160c24
commit d99f6a10c1
2 changed files with 3 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
mm/kasan/common.c
View File

@ -213,9 +213,7 @@ void __kasan_unpoison_object_data(struct kmem_cache *cache, void *object)
void __kasan_poison_object_data(struct kmem_cache *cache, void *object)
{
poison_range(object,
round_up(cache->object_size, KASAN_GRANULE_SIZE),
KASAN_KMALLOC_REDZONE);
poison_range(object, cache->object_size, KASAN_KMALLOC_REDZONE);
}
/*
@ -288,7 +286,6 @@ static bool ____kasan_slab_free(struct kmem_cache *cache, void *object,
{
u8 tag;
void *tagged_object;
unsigned long rounded_up_size;
tag = get_tag(object);
tagged_object = object;
@ -309,8 +306,7 @@ static bool ____kasan_slab_free(struct kmem_cache *cache, void *object,
return true;
}
rounded_up_size = round_up(cache->object_size, KASAN_GRANULE_SIZE);
poison_range(object, rounded_up_size, KASAN_KMALLOC_FREE);
poison_range(object, cache->object_size, KASAN_KMALLOC_FREE);
if (!kasan_stack_collection_enabled())
return false;

1
mm/kasan/shadow.c
View File

@ -82,6 +82,7 @@ void poison_range(const void *address, size_t size, u8 value)
* addresses to this function.
*/
address = kasan_reset_tag(address);
size = round_up(size, KASAN_GRANULE_SIZE);
shadow_start = kasan_mem_to_shadow(address);
shadow_end = kasan_mem_to_shadow(address + size);