[mirror_ubuntu-zesty-kernel.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>
#include <linux/sched.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_alloc_pages(struct page *page, unsigned int order);
void kasan_free_pages(struct page *page, unsigned int order);

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);
void kasan_kfree_large(const void *ptr);
void kasan_kfree(void *ptr);
void kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size);
void kasan_krealloc(const void *object, size_t new_size);

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

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

#else /* CONFIG_KASAN */

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

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_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) {}
static inline void kasan_kfree_large(const void *ptr) {}
static inline void kasan_kfree(void *ptr) {}
static inline void kasan_kmalloc(struct kmem_cache *s, const void *object,
				size_t size) {}
static inline void kasan_krealloc(const void *object, size_t new_size) {}

static inline void kasan_slab_alloc(struct kmem_cache *s, void *object) {}
static inline void kasan_slab_free(struct kmem_cache *s, void *object) {}

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

#endif /* CONFIG_KASAN */

#endif /* LINUX_KASAN_H */
Commit	Line	Data
	1	#ifndef _LINUX_KASAN_H
	2	#define _LINUX_KASAN_H
	3
	4	#include <linux/types.h>
	5
	6	struct kmem_cache;
	7	struct page;
	8	struct vm_struct;
	9
	10	#ifdef CONFIG_KASAN
	11
	12	#define KASAN_SHADOW_SCALE_SHIFT 3
	13
	14	#include <asm/kasan.h>
	15	#include <asm/pgtable.h>
	16	#include <linux/sched.h>
	17
	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
	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
	46	void kasan_alloc_pages(struct page *page, unsigned int order);
	47	void kasan_free_pages(struct page *page, unsigned int order);
	48
	49	void kasan_poison_slab(struct page *page);
	50	void kasan_unpoison_object_data(struct kmem_cache cache, void object);
	51	void kasan_poison_object_data(struct kmem_cache cache, void object);
	52
	53	void kasan_kmalloc_large(const void *ptr, size_t size);
	54	void kasan_kfree_large(const void *ptr);
	55	void kasan_kfree(void *ptr);
	56	void kasan_kmalloc(struct kmem_cache s, const void object, size_t size);
	57	void kasan_krealloc(const void *object, size_t new_size);
	58
	59	void kasan_slab_alloc(struct kmem_cache s, void object);
	60	void kasan_slab_free(struct kmem_cache s, void object);
	61
	62	int kasan_module_alloc(void *addr, size_t size);
	63	void kasan_free_shadow(const struct vm_struct *vm);
	64
	65	#else /* CONFIG_KASAN */
	66
	67	static inline void kasan_unpoison_shadow(const void *address, size_t size) {}
	68
	69	static inline void kasan_enable_current(void) {}
	70	static inline void kasan_disable_current(void) {}
	71
	72	static inline void kasan_alloc_pages(struct page *page, unsigned int order) {}
	73	static inline void kasan_free_pages(struct page *page, unsigned int order) {}
	74
	75	static inline void kasan_poison_slab(struct page *page) {}
	76	static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
	77	void *object) {}
	78	static inline void kasan_poison_object_data(struct kmem_cache *cache,
	79	void *object) {}
	80
	81	static inline void kasan_kmalloc_large(void *ptr, size_t size) {}
	82	static inline void kasan_kfree_large(const void *ptr) {}
	83	static inline void kasan_kfree(void *ptr) {}
	84	static inline void kasan_kmalloc(struct kmem_cache s, const void object,
	85	size_t size) {}
	86	static inline void kasan_krealloc(const void *object, size_t new_size) {}
	87
	88	static inline void kasan_slab_alloc(struct kmem_cache s, void object) {}
	89	static inline void kasan_slab_free(struct kmem_cache s, void object) {}
	90
	91	static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
	92	static inline void kasan_free_shadow(const struct vm_struct *vm) {}
	93
	94	#endif /* CONFIG_KASAN */
	95
	96	#endif /* LINUX_KASAN_H */