[mirror_ubuntu-zesty-kernel.git] / include / linux / kasan.h

#ifndef _LINUX_KASAN_H
#define _LINUX_KASAN_H

#include <linux/sched.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() */
static inline void kasan_enable_current(void)
{
	current->kasan_depth++;
}

/* Disable reporting bugs for current task */
static inline void kasan_disable_current(void)
{
	current->kasan_depth--;
}

void kasan_unpoison_shadow(const void *address, size_t size);

void kasan_unpoison_task_stack(struct task_struct *task);

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_destroy(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_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_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_destroy(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_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
e3ae1163	4	#include <linux/sched.h>
0b24becc AR	5	#include <linux/types.h>
	6
	7	struct kmem_cache;
	8	struct page;
a5af5aa8	9	struct vm_struct;
0b24becc AR	10
	11	#ifdef CONFIG_KASAN
	12
	13	#define KASAN_SHADOW_SCALE_SHIFT 3
0b24becc AR	14
0b24becc AR	15	#include <asm/kasan.h>
69786cdb	16	#include <asm/pgtable.h>
0b24becc	17
69786cdb AR	18	extern unsigned char kasan_zero_page[PAGE_SIZE];
	19	extern pte_t kasan_zero_pte[PTRS_PER_PTE];
	20	extern pmd_t kasan_zero_pmd[PTRS_PER_PMD];
	21	extern pud_t kasan_zero_pud[PTRS_PER_PUD];
	22
	23	void kasan_populate_zero_shadow(const void *shadow_start,
	24	const void *shadow_end);
	25
0b24becc AR	26	static inline void kasan_mem_to_shadow(const void addr)
	27	{
	28	return (void *)((unsigned long)addr >> KASAN_SHADOW_SCALE_SHIFT)
	29	+ KASAN_SHADOW_OFFSET;
	30	}
	31
	32	/* Enable reporting bugs after kasan_disable_current() */
	33	static inline void kasan_enable_current(void)
	34	{
	35	current->kasan_depth++;
	36	}
	37
	38	/* Disable reporting bugs for current task */
	39	static inline void kasan_disable_current(void)
	40	{
	41	current->kasan_depth--;
	42	}
	43
	44	void kasan_unpoison_shadow(const void *address, size_t size);
	45
e3ae1163 MR	46	void kasan_unpoison_task_stack(struct task_struct *task);
e3ae1163 MR	47
b8c73fc2 AR	48	void kasan_alloc_pages(struct page *page, unsigned int order);
	49	void kasan_free_pages(struct page *page, unsigned int order);
	50
7ed2f9e6 AP	51	void kasan_cache_create(struct kmem_cache cache, size_t size,
7ed2f9e6 AP	52	unsigned long *flags);
55834c59 AP	53	void kasan_cache_shrink(struct kmem_cache *cache);
55834c59 AP	54	void kasan_cache_destroy(struct kmem_cache *cache);
7ed2f9e6	55
0316bec2 AR	56	void kasan_poison_slab(struct page *page);
	57	void kasan_unpoison_object_data(struct kmem_cache cache, void object);
	58	void kasan_poison_object_data(struct kmem_cache cache, void object);
	59
505f5dcb	60	void kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags);
0316bec2	61	void kasan_kfree_large(const void *ptr);
9b75a867	62	void kasan_poison_kfree(void *ptr);
505f5dcb AP	63	void kasan_kmalloc(struct kmem_cache s, const void object, size_t size,
	64	gfp_t flags);
	65	void kasan_krealloc(const void *object, size_t new_size, gfp_t flags);
0316bec2	66
505f5dcb	67	void kasan_slab_alloc(struct kmem_cache s, void object, gfp_t flags);
55834c59	68	bool kasan_slab_free(struct kmem_cache s, void object);
0316bec2	69
7ed2f9e6 AP	70	struct kasan_cache {
	71	int alloc_meta_offset;
	72	int free_meta_offset;
	73	};
	74
bebf56a1	75	int kasan_module_alloc(void *addr, size_t size);
a5af5aa8	76	void kasan_free_shadow(const struct vm_struct *vm);
bebf56a1	77
9b75a867 AR	78	size_t ksize(const void *);
9b75a867 AR	79	static inline void kasan_unpoison_slab(const void *ptr) { ksize(ptr); }
80a9201a	80	size_t kasan_metadata_size(struct kmem_cache *cache);
9b75a867	81
0b24becc AR	82	#else /* CONFIG_KASAN */
	83
	84	static inline void kasan_unpoison_shadow(const void *address, size_t size) {}
	85
e3ae1163 MR	86	static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
e3ae1163 MR	87
0b24becc AR	88	static inline void kasan_enable_current(void) {}
	89	static inline void kasan_disable_current(void) {}
	90
b8c73fc2 AR	91	static inline void kasan_alloc_pages(struct page *page, unsigned int order) {}
	92	static inline void kasan_free_pages(struct page *page, unsigned int order) {}
	93
7ed2f9e6 AP	94	static inline void kasan_cache_create(struct kmem_cache *cache,
	95	size_t *size,
	96	unsigned long *flags) {}
55834c59 AP	97	static inline void kasan_cache_shrink(struct kmem_cache *cache) {}
55834c59 AP	98	static inline void kasan_cache_destroy(struct kmem_cache *cache) {}
7ed2f9e6	99
0316bec2 AR	100	static inline void kasan_poison_slab(struct page *page) {}
	101	static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
	102	void *object) {}
	103	static inline void kasan_poison_object_data(struct kmem_cache *cache,
	104	void *object) {}
	105
505f5dcb	106	static inline void kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags) {}
0316bec2	107	static inline void kasan_kfree_large(const void *ptr) {}
9b75a867	108	static inline void kasan_poison_kfree(void *ptr) {}
0316bec2	109	static inline void kasan_kmalloc(struct kmem_cache s, const void object,
505f5dcb AP	110	size_t size, gfp_t flags) {}
	111	static inline void kasan_krealloc(const void *object, size_t new_size,
	112	gfp_t flags) {}
0316bec2	113
505f5dcb AP	114	static inline void kasan_slab_alloc(struct kmem_cache s, void object,
505f5dcb AP	115	gfp_t flags) {}
55834c59 AP	116	static inline bool kasan_slab_free(struct kmem_cache s, void object)
	117	{
	118	return false;
	119	}
0316bec2	120
bebf56a1	121	static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
a5af5aa8	122	static inline void kasan_free_shadow(const struct vm_struct *vm) {}
bebf56a1	123
9b75a867	124	static inline void kasan_unpoison_slab(const void *ptr) { }
80a9201a	125	static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
9b75a867	126
0b24becc AR	127	#endif /* CONFIG_KASAN */
	128
	129	#endif /* LINUX_KASAN_H */