[linux-2.6-block.git] / include / linux / kasan.h

#ifndef _LINUX_KASAN_H
#define _LINUX_KASAN_H

#include <linux/types.h>

struct kmem_cache;
struct page;
struct vm_struct;

#ifdef CONFIG_KASAN

#define KASAN_SHADOW_SCALE_SHIFT 3

#include <asm/kasan.h>
#include <asm/pgtable.h>

extern unsigned char kasan_zero_page[PAGE_SIZE];
extern pte_t kasan_zero_pte[PTRS_PER_PTE];
extern pmd_t kasan_zero_pmd[PTRS_PER_PMD];
extern pud_t kasan_zero_pud[PTRS_PER_PUD];

void kasan_populate_zero_shadow(const void *shadow_start,
				const void *shadow_end);

static inline void *kasan_mem_to_shadow(const void *addr)
{
	return (void *)((unsigned long)addr >> KASAN_SHADOW_SCALE_SHIFT)
		+ KASAN_SHADOW_OFFSET;
}

/* Enable reporting bugs after kasan_disable_current() */
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_task_stack(struct task_struct *task);
void kasan_unpoison_stack_above_sp_to(const void *watermark);

void kasan_alloc_pages(struct page *page, unsigned int order);
void kasan_free_pages(struct page *page, unsigned int order);

void kasan_cache_create(struct kmem_cache *cache, size_t *size,
			unsigned long *flags);
void kasan_cache_shrink(struct kmem_cache *cache);
void kasan_cache_shutdown(struct kmem_cache *cache);

void kasan_poison_slab(struct page *page);
void kasan_unpoison_object_data(struct kmem_cache *cache, void *object);
void kasan_poison_object_data(struct kmem_cache *cache, void *object);
void kasan_init_slab_obj(struct kmem_cache *cache, const void *object);

void kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags);
void kasan_kfree_large(const void *ptr);
void kasan_poison_kfree(void *ptr);
void kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size,
		  gfp_t flags);
void kasan_krealloc(const void *object, size_t new_size, gfp_t flags);

void kasan_slab_alloc(struct kmem_cache *s, void *object, gfp_t flags);
bool kasan_slab_free(struct kmem_cache *s, void *object);

struct kasan_cache {
	int alloc_meta_offset;
	int free_meta_offset;
};

int kasan_module_alloc(void *addr, size_t size);
void kasan_free_shadow(const struct vm_struct *vm);

size_t ksize(const void *);
static inline void kasan_unpoison_slab(const void *ptr) { ksize(ptr); }
size_t kasan_metadata_size(struct kmem_cache *cache);

#else /* CONFIG_KASAN */

static inline void kasan_unpoison_shadow(const void *address, size_t size) {}

static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
static inline void kasan_unpoison_stack_above_sp_to(const void *watermark) {}

static inline void kasan_enable_current(void) {}
static inline void kasan_disable_current(void) {}

static inline void kasan_alloc_pages(struct page *page, unsigned int order) {}
static inline void kasan_free_pages(struct page *page, unsigned int order) {}

static inline void kasan_cache_create(struct kmem_cache *cache,
				      size_t *size,
				      unsigned long *flags) {}
static inline void kasan_cache_shrink(struct kmem_cache *cache) {}
static inline void kasan_cache_shutdown(struct kmem_cache *cache) {}

static inline void kasan_poison_slab(struct page *page) {}
static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
					void *object) {}
static inline void kasan_poison_object_data(struct kmem_cache *cache,
					void *object) {}
static inline void kasan_init_slab_obj(struct kmem_cache *cache,
				const void *object) {}

static inline void kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags) {}
static inline void kasan_kfree_large(const void *ptr) {}
static inline void kasan_poison_kfree(void *ptr) {}
static inline void kasan_kmalloc(struct kmem_cache *s, const void *object,
				size_t size, gfp_t flags) {}
static inline void kasan_krealloc(const void *object, size_t new_size,
				 gfp_t flags) {}

static inline void kasan_slab_alloc(struct kmem_cache *s, void *object,
				   gfp_t flags) {}
static inline bool kasan_slab_free(struct kmem_cache *s, void *object)
{
	return false;
}

static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
static inline void kasan_free_shadow(const struct vm_struct *vm) {}

static inline void kasan_unpoison_slab(const void *ptr) { }
static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }

#endif /* CONFIG_KASAN */

#endif /* LINUX_KASAN_H */
Commit	Line	Data
0b24becc AR	1	#ifndef _LINUX_KASAN_H
	2	#define _LINUX_KASAN_H
	3
	4	#include <linux/types.h>
	5
	6	struct kmem_cache;
	7	struct page;
a5af5aa8	8	struct vm_struct;
0b24becc AR	9
	10	#ifdef CONFIG_KASAN
	11
	12	#define KASAN_SHADOW_SCALE_SHIFT 3
0b24becc AR	13
0b24becc AR	14	#include <asm/kasan.h>
69786cdb	15	#include <asm/pgtable.h>
0b24becc	16
69786cdb AR	17	extern unsigned char kasan_zero_page[PAGE_SIZE];
	18	extern pte_t kasan_zero_pte[PTRS_PER_PTE];
	19	extern pmd_t kasan_zero_pmd[PTRS_PER_PMD];
	20	extern pud_t kasan_zero_pud[PTRS_PER_PUD];
	21
	22	void kasan_populate_zero_shadow(const void *shadow_start,
	23	const void *shadow_end);
	24
0b24becc AR	25	static inline void kasan_mem_to_shadow(const void addr)
	26	{
	27	return (void *)((unsigned long)addr >> KASAN_SHADOW_SCALE_SHIFT)
	28	+ KASAN_SHADOW_OFFSET;
	29	}
	30
	31	/* Enable reporting bugs after kasan_disable_current() */
af8601ad	32	extern void kasan_enable_current(void);
0b24becc AR	33
0b24becc AR	34	/* Disable reporting bugs for current task */
af8601ad	35	extern void kasan_disable_current(void);
0b24becc AR	36
	37	void kasan_unpoison_shadow(const void *address, size_t size);
	38
e3ae1163	39	void kasan_unpoison_task_stack(struct task_struct *task);
9f7d416c	40	void kasan_unpoison_stack_above_sp_to(const void *watermark);
e3ae1163	41
b8c73fc2 AR	42	void kasan_alloc_pages(struct page *page, unsigned int order);
	43	void kasan_free_pages(struct page *page, unsigned int order);
	44
7ed2f9e6 AP	45	void kasan_cache_create(struct kmem_cache cache, size_t size,
7ed2f9e6 AP	46	unsigned long *flags);
55834c59	47	void kasan_cache_shrink(struct kmem_cache *cache);
f9fa1d91	48	void kasan_cache_shutdown(struct kmem_cache *cache);
7ed2f9e6	49
0316bec2 AR	50	void kasan_poison_slab(struct page *page);
	51	void kasan_unpoison_object_data(struct kmem_cache cache, void object);
	52	void kasan_poison_object_data(struct kmem_cache cache, void object);
b3cbd9bf	53	void kasan_init_slab_obj(struct kmem_cache cache, const void object);
0316bec2	54
505f5dcb	55	void kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags);
0316bec2	56	void kasan_kfree_large(const void *ptr);
9b75a867	57	void kasan_poison_kfree(void *ptr);
505f5dcb AP	58	void kasan_kmalloc(struct kmem_cache s, const void object, size_t size,
	59	gfp_t flags);
	60	void kasan_krealloc(const void *object, size_t new_size, gfp_t flags);
0316bec2	61
505f5dcb	62	void kasan_slab_alloc(struct kmem_cache s, void object, gfp_t flags);
55834c59	63	bool kasan_slab_free(struct kmem_cache s, void object);
0316bec2	64
7ed2f9e6 AP	65	struct kasan_cache {
	66	int alloc_meta_offset;
	67	int free_meta_offset;
	68	};
	69
bebf56a1	70	int kasan_module_alloc(void *addr, size_t size);
a5af5aa8	71	void kasan_free_shadow(const struct vm_struct *vm);
bebf56a1	72
9b75a867 AR	73	size_t ksize(const void *);
9b75a867 AR	74	static inline void kasan_unpoison_slab(const void *ptr) { ksize(ptr); }
80a9201a	75	size_t kasan_metadata_size(struct kmem_cache *cache);
9b75a867	76
0b24becc AR	77	#else /* CONFIG_KASAN */
	78
	79	static inline void kasan_unpoison_shadow(const void *address, size_t size) {}
	80
e3ae1163	81	static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
9f7d416c	82	static inline void kasan_unpoison_stack_above_sp_to(const void *watermark) {}
e3ae1163	83
0b24becc AR	84	static inline void kasan_enable_current(void) {}
	85	static inline void kasan_disable_current(void) {}
	86
b8c73fc2 AR	87	static inline void kasan_alloc_pages(struct page *page, unsigned int order) {}
	88	static inline void kasan_free_pages(struct page *page, unsigned int order) {}
	89
7ed2f9e6 AP	90	static inline void kasan_cache_create(struct kmem_cache *cache,
	91	size_t *size,
	92	unsigned long *flags) {}
55834c59	93	static inline void kasan_cache_shrink(struct kmem_cache *cache) {}
f9fa1d91	94	static inline void kasan_cache_shutdown(struct kmem_cache *cache) {}
7ed2f9e6	95
0316bec2 AR	96	static inline void kasan_poison_slab(struct page *page) {}
	97	static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
	98	void *object) {}
	99	static inline void kasan_poison_object_data(struct kmem_cache *cache,
	100	void *object) {}
b3cbd9bf AR	101	static inline void kasan_init_slab_obj(struct kmem_cache *cache,
b3cbd9bf AR	102	const void *object) {}
0316bec2	103
505f5dcb	104	static inline void kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags) {}
0316bec2	105	static inline void kasan_kfree_large(const void *ptr) {}
9b75a867	106	static inline void kasan_poison_kfree(void *ptr) {}
0316bec2	107	static inline void kasan_kmalloc(struct kmem_cache s, const void object,
505f5dcb AP	108	size_t size, gfp_t flags) {}
	109	static inline void kasan_krealloc(const void *object, size_t new_size,
	110	gfp_t flags) {}
0316bec2	111
505f5dcb AP	112	static inline void kasan_slab_alloc(struct kmem_cache s, void object,
505f5dcb AP	113	gfp_t flags) {}
55834c59 AP	114	static inline bool kasan_slab_free(struct kmem_cache s, void object)
	115	{
	116	return false;
	117	}
0316bec2	118
bebf56a1	119	static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
a5af5aa8	120	static inline void kasan_free_shadow(const struct vm_struct *vm) {}
bebf56a1	121
9b75a867	122	static inline void kasan_unpoison_slab(const void *ptr) { }
80a9201a	123	static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
9b75a867	124
0b24becc AR	125	#endif /* CONFIG_KASAN */
	126
	127	#endif /* LINUX_KASAN_H */