Commit e4a6416d authored by Andrey Konovalov's avatar Andrey Konovalov Committed by Vincenzo Frascino
Browse files

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.

Signed-off-by: default avatarAndrey Konovalov <andreyknvl@google.com>
Signed-off-by: Vincenzo Frascino's avatarVincenzo Frascino <vincenzo.frascino@arm.com>
Reviewed-by: default avatarMarco Elver <elver@google.com>
---
Change-Id: I0b627b24187d06c8b9bb2f1d04d94b3d06945e73
parent 7dba6f92
......@@ -441,9 +441,8 @@ void kasan_remove_zero_shadow(void *start, unsigned long size)
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, unsigned long size)
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);
......
......@@ -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 */
......
......@@ -174,7 +174,7 @@ static int __meminit kasan_mem_notifier(struct notifier_block *nb,
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 start, unsigned long end,
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);
......
Supports Markdown
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment