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

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_KASAN_H
#define _LINUX_KASAN_H

#include <linux/types.h>

struct kmem_cache;
struct page;
struct vm_struct;
struct task_struct;

#ifdef CONFIG_KASAN

#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];
extern p4d_t kasan_zero_p4d[MAX_PTRS_PER_P4D];

int 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, unsigned int *size,
			slab_flags_t *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(void *ptr, unsigned long ip);
void kasan_poison_kfree(void *ptr, unsigned long ip);
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, unsigned long ip);

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);

int kasan_add_zero_shadow(void *start, unsigned long size);
void kasan_remove_zero_shadow(void *start, unsigned long size);

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);

bool kasan_save_enable_multi_shot(void);
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_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,
				      unsigned int *size,
				      slab_flags_t *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(void *ptr, unsigned long ip) {}
static inline void kasan_poison_kfree(void *ptr, unsigned long ip) {}
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,
				   unsigned long ip)
{
	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 int kasan_add_zero_shadow(void *start, unsigned long size)
{
	return 0;
}
static inline void kasan_remove_zero_shadow(void *start,
					unsigned long size)
{}

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
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
0b24becc AR	2	#ifndef _LINUX_KASAN_H
	3	#define _LINUX_KASAN_H
	4
	5	#include <linux/types.h>
	6
	7	struct kmem_cache;
	8	struct page;
a5af5aa8	9	struct vm_struct;
5be9b730	10	struct task_struct;
0b24becc AR	11
	12	#ifdef CONFIG_KASAN
	13
0b24becc	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];
c65e774f	21	extern p4d_t kasan_zero_p4d[MAX_PTRS_PER_P4D];
69786cdb	22
0207df4f	23	int kasan_populate_zero_shadow(const void *shadow_start,
69786cdb AR	24	const void *shadow_end);
69786cdb AR	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() */
af8601ad	33	extern void kasan_enable_current(void);
0b24becc AR	34
0b24becc AR	35	/* Disable reporting bugs for current task */
af8601ad	36	extern void kasan_disable_current(void);
0b24becc AR	37
	38	void kasan_unpoison_shadow(const void *address, size_t size);
	39
e3ae1163	40	void kasan_unpoison_task_stack(struct task_struct *task);
9f7d416c	41	void kasan_unpoison_stack_above_sp_to(const void *watermark);
e3ae1163	42
b8c73fc2 AR	43	void kasan_alloc_pages(struct page *page, unsigned int order);
	44	void kasan_free_pages(struct page *page, unsigned int order);
	45
be4a7988	46	void kasan_cache_create(struct kmem_cache cache, unsigned int size,
d50112ed	47	slab_flags_t *flags);
55834c59	48	void kasan_cache_shrink(struct kmem_cache *cache);
f9fa1d91	49	void kasan_cache_shutdown(struct kmem_cache *cache);
7ed2f9e6	50
0316bec2 AR	51	void kasan_poison_slab(struct page *page);
	52	void kasan_unpoison_object_data(struct kmem_cache cache, void object);
	53	void kasan_poison_object_data(struct kmem_cache cache, void object);
b3cbd9bf	54	void kasan_init_slab_obj(struct kmem_cache cache, const void object);
0316bec2	55
505f5dcb	56	void kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags);
ee3ce779	57	void kasan_kfree_large(void *ptr, unsigned long ip);
6860f634	58	void kasan_poison_kfree(void *ptr, unsigned long ip);
505f5dcb AP	59	void kasan_kmalloc(struct kmem_cache s, const void object, size_t size,
	60	gfp_t flags);
	61	void kasan_krealloc(const void *object, size_t new_size, gfp_t flags);
0316bec2	62
505f5dcb	63	void kasan_slab_alloc(struct kmem_cache s, void object, gfp_t flags);
ee3ce779	64	bool kasan_slab_free(struct kmem_cache s, void object, unsigned long ip);
0316bec2	65
7ed2f9e6 AP	66	struct kasan_cache {
	67	int alloc_meta_offset;
	68	int free_meta_offset;
	69	};
	70
bebf56a1	71	int kasan_module_alloc(void *addr, size_t size);
a5af5aa8	72	void kasan_free_shadow(const struct vm_struct *vm);
bebf56a1	73
0207df4f AR	74	int kasan_add_zero_shadow(void *start, unsigned long size);
	75	void kasan_remove_zero_shadow(void *start, unsigned long size);
	76
9b75a867 AR	77	size_t ksize(const void *);
9b75a867 AR	78	static inline void kasan_unpoison_slab(const void *ptr) { ksize(ptr); }
80a9201a	79	size_t kasan_metadata_size(struct kmem_cache *cache);
9b75a867	80
b0845ce5 MR	81	bool kasan_save_enable_multi_shot(void);
	82	void kasan_restore_multi_shot(bool enabled);
	83
0b24becc AR	84	#else /* CONFIG_KASAN */
	85
	86	static inline void kasan_unpoison_shadow(const void *address, size_t size) {}
	87
e3ae1163	88	static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
9f7d416c	89	static inline void kasan_unpoison_stack_above_sp_to(const void *watermark) {}
e3ae1163	90
0b24becc AR	91	static inline void kasan_enable_current(void) {}
	92	static inline void kasan_disable_current(void) {}
	93
b8c73fc2 AR	94	static inline void kasan_alloc_pages(struct page *page, unsigned int order) {}
	95	static inline void kasan_free_pages(struct page *page, unsigned int order) {}
	96
7ed2f9e6	97	static inline void kasan_cache_create(struct kmem_cache *cache,
be4a7988	98	unsigned int *size,
d50112ed	99	slab_flags_t *flags) {}
55834c59	100	static inline void kasan_cache_shrink(struct kmem_cache *cache) {}
f9fa1d91	101	static inline void kasan_cache_shutdown(struct kmem_cache *cache) {}
7ed2f9e6	102
0316bec2 AR	103	static inline void kasan_poison_slab(struct page *page) {}
	104	static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
	105	void *object) {}
	106	static inline void kasan_poison_object_data(struct kmem_cache *cache,
	107	void *object) {}
b3cbd9bf AR	108	static inline void kasan_init_slab_obj(struct kmem_cache *cache,
b3cbd9bf AR	109	const void *object) {}
0316bec2	110
505f5dcb	111	static inline void kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags) {}
ee3ce779	112	static inline void kasan_kfree_large(void *ptr, unsigned long ip) {}
6860f634	113	static inline void kasan_poison_kfree(void *ptr, unsigned long ip) {}
0316bec2	114	static inline void kasan_kmalloc(struct kmem_cache s, const void object,
505f5dcb AP	115	size_t size, gfp_t flags) {}
	116	static inline void kasan_krealloc(const void *object, size_t new_size,
	117	gfp_t flags) {}
0316bec2	118
505f5dcb AP	119	static inline void kasan_slab_alloc(struct kmem_cache s, void object,
505f5dcb AP	120	gfp_t flags) {}
ee3ce779 DV	121	static inline bool kasan_slab_free(struct kmem_cache s, void object,
ee3ce779 DV	122	unsigned long ip)
55834c59 AP	123	{
	124	return false;
	125	}
0316bec2	126
bebf56a1	127	static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
a5af5aa8	128	static inline void kasan_free_shadow(const struct vm_struct *vm) {}
bebf56a1	129
0207df4f AR	130	static inline int kasan_add_zero_shadow(void *start, unsigned long size)
	131	{
	132	return 0;
	133	}
	134	static inline void kasan_remove_zero_shadow(void *start,
	135	unsigned long size)
	136	{}
	137
9b75a867	138	static inline void kasan_unpoison_slab(const void *ptr) { }
80a9201a	139	static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
9b75a867	140
0b24becc AR	141	#endif /* CONFIG_KASAN */
	142
	143	#endif /* LINUX_KASAN_H */