Release 4.7 mm/kasan/kasan.h

#ifndef __MM_KASAN_KASAN_H

#define __MM_KASAN_KASAN_H

#include <linux/kasan.h>
#include <linux/stackdepot.h>


#define KASAN_SHADOW_SCALE_SIZE (1UL << KASAN_SHADOW_SCALE_SHIFT)

#define KASAN_SHADOW_MASK       (KASAN_SHADOW_SCALE_SIZE - 1)


#define KASAN_FREE_PAGE         0xFF  
/* page was freed */

#define KASAN_PAGE_REDZONE      0xFE  
/* redzone for kmalloc_large allocations */

#define KASAN_KMALLOC_REDZONE   0xFC  
/* redzone inside slub object */

#define KASAN_KMALLOC_FREE      0xFB  
/* object was freed (kmem_cache_free/kfree) */

#define KASAN_GLOBAL_REDZONE    0xFA  
/* redzone for global variable */

/*
 * Stack redzone shadow values
 * (Those are compiler's ABI, don't change them)
 */

#define KASAN_STACK_LEFT        0xF1

#define KASAN_STACK_MID         0xF2

#define KASAN_STACK_RIGHT       0xF3

#define KASAN_STACK_PARTIAL     0xF4

/* Don't break randconfig/all*config builds */
#ifndef KASAN_ABI_VERSION

#define KASAN_ABI_VERSION 1
#endif


struct kasan_access_info {
	
const void *access_addr;
	
const void *first_bad_addr;
	
size_t access_size;
	
bool is_write;
	
unsigned long ip;
};

/* The layout of struct dictated by compiler */

struct kasan_source_location {
	
const char *filename;
	
int line_no;
	
int column_no;
};

/* The layout of struct dictated by compiler */

struct kasan_global {
	
const void *beg;		/* Address of the beginning of the global variable. */
	
size_t size;			/* Size of the global variable. */
	
size_t size_with_redzone;	/* Size of the variable + size of the red zone. 32 bytes aligned */
	
const void *name;
	
const void *module_name;	/* Name of the module where the global variable is declared. */
	
unsigned long has_dynamic_init;	/* This needed for C++ */
#if KASAN_ABI_VERSION >= 4
	
struct kasan_source_location *location;
#endif
};

/**
 * Structures to keep alloc and free tracks *
 */


enum kasan_state {
	
KASAN_STATE_INIT,
	
KASAN_STATE_ALLOC,
	
KASAN_STATE_QUARANTINE,
	
KASAN_STATE_FREE
};


#define KASAN_STACK_DEPTH 64


struct kasan_track {
	
u32 pid;
	
depot_stack_handle_t stack;
};


struct kasan_alloc_meta {
	
struct kasan_track track;
	
u32 state : 2;	/* enum kasan_state */
	
u32 alloc_size : 30;
};


struct qlist_node {
	
struct qlist_node *next;
};

struct kasan_free_meta {
	/* This field is used while the object is in the quarantine.
         * Otherwise it might be used for the allocator freelist.
         */
	
struct qlist_node quarantine_link;
	
struct kasan_track track;
};

struct kasan_alloc_meta *get_alloc_info(struct kmem_cache *cache,
					const void *object);
struct kasan_free_meta *get_free_info(struct kmem_cache *cache,
					const void *object);




static inline const void *kasan_shadow_to_mem(const void *shadow_addr)
{
	return (void *)(((unsigned long)shadow_addr - KASAN_SHADOW_OFFSET)
		<< KASAN_SHADOW_SCALE_SHIFT);
}

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static inline bool kasan_report_enabled(void)
{
	return !current->kasan_depth;
}

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void kasan_report(unsigned long addr, size_t size,
		bool is_write, unsigned long ip);

#ifdef CONFIG_SLAB
void quarantine_put(struct kasan_free_meta *info, struct kmem_cache *cache);
void quarantine_reduce(void);
void quarantine_remove_cache(struct kmem_cache *cache);
#else


static inline void quarantine_put(struct kasan_free_meta *info,
				struct kmem_cache *cache) { }
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static inline void quarantine_reduce(void) { }
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static inline void quarantine_remove_cache(struct kmem_cache *cache) { }
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#endif

#endif
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