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kasan: rename (un)poison_shadow to (un)poison_range 

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.  Rename external annotation
kasan_unpoison_shadow() to kasan_unpoison_range(), and introduce internal
functions (un)poison_range() (without kasan_ prefix).

Co-developed-by: Marco Elver <elver@google.com>
Link: https://lkml.kernel.org/r/fccdcaa13dc6b2211bf363d6c6d499279a54fe3a.1606161801.git.andreyknvl@google.com
Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@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: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dmitry Vyukov <dvyukov@google.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 12:00:21 -08:00 committed by Linus Torvalds
parent d5750edf6d
commit cebd0eb29a
7 changed files with 47 additions and 42 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
include/linux/kasan.h
View File

@ -72,7 +72,7 @@ extern void kasan_enable_current(void);
/* Disable reporting bugs for current task */
extern void kasan_disable_current(void);
void kasan_unpoison_shadow(const void *address, size_t size);
void kasan_unpoison_range(const void *address, size_t size);
void kasan_unpoison_task_stack(struct task_struct *task);
@ -109,7 +109,7 @@ struct kasan_cache {
size_t __ksize(const void *);
static inline void kasan_unpoison_slab(const void *ptr)
{
kasan_unpoison_shadow(ptr, __ksize(ptr));
kasan_unpoison_range(ptr, __ksize(ptr));
}
size_t kasan_metadata_size(struct kmem_cache *cache);
@ -118,7 +118,7 @@ void kasan_restore_multi_shot(bool enabled);
#else /* CONFIG_KASAN */
static inline void kasan_unpoison_shadow(const void *address, size_t size) {}
static inline void kasan_unpoison_range(const void *address, size_t size) {}
static inline void kasan_unpoison_task_stack(struct task_struct *task) {}

4
kernel/fork.c
View File

@ -225,8 +225,8 @@ static unsigned long *alloc_thread_stack_node(struct task_struct *tsk, int node)
if (!s)
continue;
/* Clear the KASAN shadow of the stack. */
kasan_unpoison_shadow(s->addr, THREAD_SIZE);
/* Mark stack accessible for KASAN. */
kasan_unpoison_range(s->addr, THREAD_SIZE);
/* Clear stale pointers from reused stack. */
memset(s->addr, 0, THREAD_SIZE);

43
mm/kasan/common.c
View File

@ -108,7 +108,7 @@ void *memcpy(void *dest, const void *src, size_t len)
* Poisons the shadow memory for 'size' bytes starting from 'addr'.
* Memory addresses should be aligned to KASAN_SHADOW_SCALE_SIZE.
*/
void kasan_poison_shadow(const void *address, size_t size, u8 value)
void poison_range(const void *address, size_t size, u8 value)
{
void *shadow_start, *shadow_end;
@ -125,7 +125,7 @@ void kasan_poison_shadow(const void *address, size_t size, u8 value)
__memset(shadow_start, value, shadow_end - shadow_start);
}
void kasan_unpoison_shadow(const void *address, size_t size)
void unpoison_range(const void *address, size_t size)
{
u8 tag = get_tag(address);
@ -136,7 +136,7 @@ void kasan_unpoison_shadow(const void *address, size_t size)
*/
address = reset_tag(address);
kasan_poison_shadow(address, size, tag);
poison_range(address, size, tag);
if (size & KASAN_SHADOW_MASK) {
u8 *shadow = (u8 *)kasan_mem_to_shadow(address + size);
@ -148,12 +148,17 @@ void kasan_unpoison_shadow(const void *address, size_t size)
}
}
void kasan_unpoison_range(const void *address, size_t size)
{
unpoison_range(address, size);
}
static void __kasan_unpoison_stack(struct task_struct *task, const void *sp)
{
void *base = task_stack_page(task);
size_t size = sp - base;
kasan_unpoison_shadow(base, size);
unpoison_range(base, size);
}
/* Unpoison the entire stack for a task. */
@ -172,7 +177,7 @@ asmlinkage void kasan_unpoison_task_stack_below(const void *watermark)
*/
void *base = (void *)((unsigned long)watermark & ~(THREAD_SIZE - 1));
kasan_unpoison_shadow(base, watermark - base);
unpoison_range(base, watermark - base);
}
void kasan_alloc_pages(struct page *page, unsigned int order)
@ -186,13 +191,13 @@ void kasan_alloc_pages(struct page *page, unsigned int order)
tag = random_tag();
for (i = 0; i < (1 << order); i++)
page_kasan_tag_set(page + i, tag);
kasan_unpoison_shadow(page_address(page), PAGE_SIZE << order);
unpoison_range(page_address(page), PAGE_SIZE << order);
}
void kasan_free_pages(struct page *page, unsigned int order)
{
if (likely(!PageHighMem(page)))
kasan_poison_shadow(page_address(page),
poison_range(page_address(page),
PAGE_SIZE << order,
KASAN_FREE_PAGE);
}
@ -284,18 +289,18 @@ void kasan_poison_slab(struct page *page)
for (i = 0; i < compound_nr(page); i++)
page_kasan_tag_reset(page + i);
kasan_poison_shadow(page_address(page), page_size(page),
poison_range(page_address(page), page_size(page),
KASAN_KMALLOC_REDZONE);
}
void kasan_unpoison_object_data(struct kmem_cache *cache, void *object)
{
kasan_unpoison_shadow(object, cache->object_size);
unpoison_range(object, cache->object_size);
}
void kasan_poison_object_data(struct kmem_cache *cache, void *object)
{
kasan_poison_shadow(object,
poison_range(object,
round_up(cache->object_size, KASAN_SHADOW_SCALE_SIZE),
KASAN_KMALLOC_REDZONE);
}
@ -408,7 +413,7 @@ static bool __kasan_slab_free(struct kmem_cache *cache, void *object,
}
rounded_up_size = round_up(cache->object_size, KASAN_SHADOW_SCALE_SIZE);
kasan_poison_shadow(object, rounded_up_size, KASAN_KMALLOC_FREE);
poison_range(object, rounded_up_size, KASAN_KMALLOC_FREE);
if ((IS_ENABLED(CONFIG_KASAN_GENERIC) && !quarantine) ||
unlikely(!(cache->flags & SLAB_KASAN)))
@ -448,8 +453,8 @@ static void *__kasan_kmalloc(struct kmem_cache *cache, const void *object,
tag = assign_tag(cache, object, false, keep_tag);
/* Tag is ignored in set_tag without CONFIG_KASAN_SW_TAGS */
kasan_unpoison_shadow(set_tag(object, tag), size);
kasan_poison_shadow((void *)redzone_start, redzone_end - redzone_start,
unpoison_range(set_tag(object, tag), size);
poison_range((void *)redzone_start, redzone_end - redzone_start,
KASAN_KMALLOC_REDZONE);
if (cache->flags & SLAB_KASAN)
@ -489,8 +494,8 @@ void * __must_check kasan_kmalloc_large(const void *ptr, size_t size,
KASAN_SHADOW_SCALE_SIZE);
redzone_end = (unsigned long)ptr + page_size(page);
kasan_unpoison_shadow(ptr, size);
kasan_poison_shadow((void *)redzone_start, redzone_end - redzone_start,
unpoison_range(ptr, size);
poison_range((void *)redzone_start, redzone_end - redzone_start,
KASAN_PAGE_REDZONE);
return (void *)ptr;
@ -523,7 +528,7 @@ void kasan_poison_kfree(void *ptr, unsigned long ip)
kasan_report_invalid_free(ptr, ip);
return;
}
kasan_poison_shadow(ptr, page_size(page), KASAN_FREE_PAGE);
poison_range(ptr, page_size(page), KASAN_FREE_PAGE);
} else {
__kasan_slab_free(page->slab_cache, ptr, ip, false);
}
@ -709,7 +714,7 @@ int kasan_populate_vmalloc(unsigned long addr, unsigned long size)
* // vmalloc() allocates memory
* // let a = area->addr
* // we reach kasan_populate_vmalloc
* // and call kasan_unpoison_shadow:
* // and call unpoison_range:
* STORE shadow(a), unpoison_val
* ...
* STORE shadow(a+99), unpoison_val x = LOAD p
@ -744,7 +749,7 @@ void kasan_poison_vmalloc(const void *start, unsigned long size)
return;
size = round_up(size, KASAN_SHADOW_SCALE_SIZE);
kasan_poison_shadow(start, size, KASAN_VMALLOC_INVALID);
poison_range(start, size, KASAN_VMALLOC_INVALID);
}
void kasan_unpoison_vmalloc(const void *start, unsigned long size)
@ -752,7 +757,7 @@ void kasan_unpoison_vmalloc(const void *start, unsigned long size)
if (!is_vmalloc_or_module_addr(start))
return;
kasan_unpoison_shadow(start, size);
unpoison_range(start, size);
}
static int kasan_depopulate_vmalloc_pte(pte_t *ptep, unsigned long addr,

13
mm/kasan/generic.c
View File

@ -202,9 +202,9 @@ static void register_global(struct kasan_global *global)
{
size_t aligned_size = round_up(global->size, KASAN_SHADOW_SCALE_SIZE);
kasan_unpoison_shadow(global->beg, global->size);
unpoison_range(global->beg, global->size);
kasan_poison_shadow(global->beg + aligned_size,
poison_range(global->beg + aligned_size,
global->size_with_redzone - aligned_size,
KASAN_GLOBAL_REDZONE);
}
@ -285,12 +285,11 @@ void __asan_alloca_poison(unsigned long addr, size_t size)
WARN_ON(!IS_ALIGNED(addr, KASAN_ALLOCA_REDZONE_SIZE));
kasan_unpoison_shadow((const void *)(addr + rounded_down_size),
unpoison_range((const void *)(addr + rounded_down_size),
size - rounded_down_size);
kasan_poison_shadow(left_redzone, KASAN_ALLOCA_REDZONE_SIZE,
poison_range(left_redzone, KASAN_ALLOCA_REDZONE_SIZE,
KASAN_ALLOCA_LEFT);
kasan_poison_shadow(right_redzone,
padding_size + KASAN_ALLOCA_REDZONE_SIZE,
poison_range(right_redzone, padding_size + KASAN_ALLOCA_REDZONE_SIZE,
KASAN_ALLOCA_RIGHT);
}
EXPORT_SYMBOL(__asan_alloca_poison);
@ -301,7 +300,7 @@ void __asan_allocas_unpoison(const void *stack_top, const void *stack_bottom)
if (unlikely(!stack_top || stack_top > stack_bottom))
return;
kasan_unpoison_shadow(stack_top, stack_bottom - stack_top);
unpoison_range(stack_top, stack_bottom - stack_top);
}
EXPORT_SYMBOL(__asan_allocas_unpoison);

3
mm/kasan/kasan.h
View File

@ -150,7 +150,8 @@ static inline bool addr_has_shadow(const void *addr)
return (addr >= kasan_shadow_to_mem((void *)KASAN_SHADOW_START));
}
void kasan_poison_shadow(const void *address, size_t size, u8 value);
void poison_range(const void *address, size_t size, u8 value);
void unpoison_range(const void *address, size_t size);
/**
* check_memory_region - Check memory region, and report if invalid access.

2
mm/kasan/tags.c
View File

@ -153,7 +153,7 @@ EXPORT_SYMBOL(__hwasan_storeN_noabort);
void __hwasan_tag_memory(unsigned long addr, u8 tag, unsigned long size)
{
kasan_poison_shadow((void *)addr, size, tag);
poison_range((void *)addr, size, tag);
}
EXPORT_SYMBOL(__hwasan_tag_memory);

2
mm/slab_common.c
View File

@ -1176,7 +1176,7 @@ size_t ksize(const void *objp)
* We assume that ksize callers could use whole allocated area,
* so we need to unpoison this area.
*/
kasan_unpoison_shadow(objp, size);
kasan_unpoison_range(objp, size);
return size;
}
EXPORT_SYMBOL(ksize);