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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_KASAN_H
#define _LINUX_KASAN_H
#include <linux/bug.h>
#include <linux/kasan-enabled.h>
#include <linux/kasan-tags.h>
#include <linux/kernel.h>
#include <linux/static_key.h>
#include <linux/types.h>
struct kmem_cache;
struct page;
struct slab;
struct vm_struct;
struct task_struct;
#ifdef CONFIG_KASAN
#include <linux/linkage.h>
#include <asm/kasan.h>
#endif
typedef unsigned int __bitwise kasan_vmalloc_flags_t;
#define KASAN_VMALLOC_NONE ((__force kasan_vmalloc_flags_t)0x00u)
#define KASAN_VMALLOC_INIT ((__force kasan_vmalloc_flags_t)0x01u)
#define KASAN_VMALLOC_VM_ALLOC ((__force kasan_vmalloc_flags_t)0x02u)
#define KASAN_VMALLOC_PROT_NORMAL ((__force kasan_vmalloc_flags_t)0x04u)
#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
#include <linux/pgtable.h>
/* Software KASAN implementations use shadow memory. */
#ifdef CONFIG_KASAN_SW_TAGS
/* This matches KASAN_TAG_INVALID. */
#define KASAN_SHADOW_INIT 0xFE
#else
#define KASAN_SHADOW_INIT 0
#endif
#ifndef PTE_HWTABLE_PTRS
#define PTE_HWTABLE_PTRS 0
#endif
extern unsigned char kasan_early_shadow_page[PAGE_SIZE];
extern pte_t kasan_early_shadow_pte[MAX_PTRS_PER_PTE + PTE_HWTABLE_PTRS];
extern pmd_t kasan_early_shadow_pmd[MAX_PTRS_PER_PMD];
extern pud_t kasan_early_shadow_pud[MAX_PTRS_PER_PUD];
extern p4d_t kasan_early_shadow_p4d[MAX_PTRS_PER_P4D];
int kasan_populate_early_shadow(const void *shadow_start,
const void *shadow_end);
#ifndef kasan_mem_to_shadow
static inline void *kasan_mem_to_shadow(const void *addr)
{
return (void *)((unsigned long)addr >> KASAN_SHADOW_SCALE_SHIFT)
+ KASAN_SHADOW_OFFSET;
}
#endif
int kasan_add_zero_shadow(void *start, unsigned long size);
void kasan_remove_zero_shadow(void *start, unsigned long size);
/* 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);
#else /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
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_enable_current(void) {}
static inline void kasan_disable_current(void) {}
#endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
#ifdef CONFIG_KASAN_HW_TAGS
#else /* CONFIG_KASAN_HW_TAGS */
#endif /* CONFIG_KASAN_HW_TAGS */
static inline bool kasan_has_integrated_init(void)
{
return kasan_hw_tags_enabled();
}
#ifdef CONFIG_KASAN
void __kasan_unpoison_range(const void *addr, size_t size);
static __always_inline void kasan_unpoison_range(const void *addr, size_t size)
{
if (kasan_enabled())
__kasan_unpoison_range(addr, size);
}
void __kasan_poison_pages(struct page *page, unsigned int order, bool init);
static __always_inline void kasan_poison_pages(struct page *page,
unsigned int order, bool init)
{
if (kasan_enabled())
__kasan_poison_pages(page, order, init);
}
bool __kasan_unpoison_pages(struct page *page, unsigned int order, bool init);
static __always_inline bool kasan_unpoison_pages(struct page *page,
unsigned int order, bool init)
{
if (kasan_enabled())
return __kasan_unpoison_pages(page, order, init);
return false;
}
void __kasan_poison_slab(struct slab *slab);
static __always_inline void kasan_poison_slab(struct slab *slab)
{
if (kasan_enabled())
__kasan_poison_slab(slab);
}
void __kasan_unpoison_new_object(struct kmem_cache *cache, void *object);
/**
* kasan_unpoison_new_object - Temporarily unpoison a new slab object.
* @cache: Cache the object belong to.
* @object: Pointer to the object.
*
* This function is intended for the slab allocator's internal use. It
* temporarily unpoisons an object from a newly allocated slab without doing
* anything else. The object must later be repoisoned by
* kasan_poison_new_object().
*/
static __always_inline void kasan_unpoison_new_object(struct kmem_cache *cache,
void *object)
{
if (kasan_enabled())
__kasan_unpoison_new_object(cache, object);
}
void __kasan_poison_new_object(struct kmem_cache *cache, void *object);
/**
* kasan_unpoison_new_object - Repoison a new slab object.
* @cache: Cache the object belong to.
* @object: Pointer to the object.
*
* This function is intended for the slab allocator's internal use. It
* repoisons an object that was previously unpoisoned by
* kasan_unpoison_new_object() without doing anything else.
*/
static __always_inline void kasan_poison_new_object(struct kmem_cache *cache,
void *object)
{
if (kasan_enabled())
__kasan_poison_new_object(cache, object);
}
void * __must_check __kasan_init_slab_obj(struct kmem_cache *cache,
const void *object);
static __always_inline void * __must_check kasan_init_slab_obj(
struct kmem_cache *cache, const void *object)
{
if (kasan_enabled())
return __kasan_init_slab_obj(cache, object);
return (void *)object;
}
bool __kasan_slab_free(struct kmem_cache *s, void *object,
unsigned long ip, bool init);
static __always_inline bool kasan_slab_free(struct kmem_cache *s,
void *object, bool init)
{
if (kasan_enabled())
return __kasan_slab_free(s, object, _RET_IP_, init);
return false;
}
void __kasan_kfree_large(void *ptr, unsigned long ip);
static __always_inline void kasan_kfree_large(void *ptr)
{
if (kasan_enabled())
__kasan_kfree_large(ptr, _RET_IP_);
}
void * __must_check __kasan_slab_alloc(struct kmem_cache *s,
void *object, gfp_t flags, bool init);
static __always_inline void * __must_check kasan_slab_alloc(
struct kmem_cache *s, void *object, gfp_t flags, bool init)
{
if (kasan_enabled())
return __kasan_slab_alloc(s, object, flags, init);
return object;
}
void * __must_check __kasan_kmalloc(struct kmem_cache *s, const void *object,
size_t size, gfp_t flags);
static __always_inline void * __must_check kasan_kmalloc(struct kmem_cache *s,
const void *object, size_t size, gfp_t flags)
{
if (kasan_enabled())
return __kasan_kmalloc(s, object, size, flags);
return (void *)object;
}
void * __must_check __kasan_kmalloc_large(const void *ptr,
size_t size, gfp_t flags);
static __always_inline void * __must_check kasan_kmalloc_large(const void *ptr,
size_t size, gfp_t flags)
{
if (kasan_enabled())
return __kasan_kmalloc_large(ptr, size, flags);
return (void *)ptr;
}
void * __must_check __kasan_krealloc(const void *object,
size_t new_size, gfp_t flags);
static __always_inline void * __must_check kasan_krealloc(const void *object,
size_t new_size, gfp_t flags)
{
if (kasan_enabled())
return __kasan_krealloc(object, new_size, flags);
return (void *)object;
}
bool __kasan_mempool_poison_pages(struct page *page, unsigned int order,
unsigned long ip);
/**
* kasan_mempool_poison_pages - Check and poison a mempool page allocation.
* @page: Pointer to the page allocation.
* @order: Order of the allocation.
*
* This function is intended for kernel subsystems that cache page allocations
* to reuse them instead of freeing them back to page_alloc (e.g. mempool).
*
* This function is similar to kasan_mempool_poison_object() but operates on
* page allocations.
*
* Before the poisoned allocation can be reused, it must be unpoisoned via
* kasan_mempool_unpoison_pages().
*
* Return: true if the allocation can be safely reused; false otherwise.
*/
static __always_inline bool kasan_mempool_poison_pages(struct page *page,
unsigned int order)
{
if (kasan_enabled())
return __kasan_mempool_poison_pages(page, order, _RET_IP_);
return true;
}
void __kasan_mempool_unpoison_pages(struct page *page, unsigned int order,
unsigned long ip);
/**
* kasan_mempool_unpoison_pages - Unpoison a mempool page allocation.
* @page: Pointer to the page allocation.
* @order: Order of the allocation.
*
* This function is intended for kernel subsystems that cache page allocations
* to reuse them instead of freeing them back to page_alloc (e.g. mempool).
*
* This function unpoisons a page allocation that was previously poisoned by
* kasan_mempool_poison_pages() without zeroing the allocation's memory. For
* the tag-based modes, this function assigns a new tag to the allocation.
*/
static __always_inline void kasan_mempool_unpoison_pages(struct page *page,
unsigned int order)
{
if (kasan_enabled())
__kasan_mempool_unpoison_pages(page, order, _RET_IP_);
}
bool __kasan_mempool_poison_object(void *ptr, unsigned long ip);
/**
* kasan_mempool_poison_object - Check and poison a mempool slab allocation.
* @ptr: Pointer to the slab allocation.
*
* This function is intended for kernel subsystems that cache slab allocations
* to reuse them instead of freeing them back to the slab allocator (e.g.
* mempool).
*
* This function poisons a slab allocation and saves a free stack trace for it
* without initializing the allocation's memory and without putting it into the
* quarantine (for the Generic mode).
*
* This function also performs checks to detect double-free and invalid-free
* bugs and reports them. The caller can use the return value of this function
* to find out if the allocation is buggy.
*
* Before the poisoned allocation can be reused, it must be unpoisoned via
* kasan_mempool_unpoison_object().
*
* This function operates on all slab allocations including large kmalloc
* allocations (the ones returned by kmalloc_large() or by kmalloc() with the
* size > KMALLOC_MAX_SIZE).
*
* Return: true if the allocation can be safely reused; false otherwise.
*/
static __always_inline bool kasan_mempool_poison_object(void *ptr)
{
if (kasan_enabled())
return __kasan_mempool_poison_object(ptr, _RET_IP_);
return true;
}
void __kasan_mempool_unpoison_object(void *ptr, size_t size, unsigned long ip);
/**
* kasan_mempool_unpoison_object - Unpoison a mempool slab allocation.
* @ptr: Pointer to the slab allocation.
* @size: Size to be unpoisoned.
*
* This function is intended for kernel subsystems that cache slab allocations
* to reuse them instead of freeing them back to the slab allocator (e.g.
* mempool).
*
* This function unpoisons a slab allocation that was previously poisoned via
* kasan_mempool_poison_object() and saves an alloc stack trace for it without
* initializing the allocation's memory. For the tag-based modes, this function
* does not assign a new tag to the allocation and instead restores the
* original tags based on the pointer value.
*
* This function operates on all slab allocations including large kmalloc
* allocations (the ones returned by kmalloc_large() or by kmalloc() with the
* size > KMALLOC_MAX_SIZE).
*/
static __always_inline void kasan_mempool_unpoison_object(void *ptr,
size_t size)
{
if (kasan_enabled())
__kasan_mempool_unpoison_object(ptr, size, _RET_IP_);
}
/*
* Unlike kasan_check_read/write(), kasan_check_byte() is performed even for
* the hardware tag-based mode that doesn't rely on compiler instrumentation.
*/
bool __kasan_check_byte(const void *addr, unsigned long ip);
static __always_inline bool kasan_check_byte(const void *addr)
{
if (kasan_enabled())
return __kasan_check_byte(addr, _RET_IP_);
return true;
}
#else /* CONFIG_KASAN */
static inline void kasan_unpoison_range(const void *address, size_t size) {}
static inline void kasan_poison_pages(struct page *page, unsigned int order,
bool init) {}
static inline bool kasan_unpoison_pages(struct page *page, unsigned int order,
bool init)
{
return false;
}
static inline void kasan_poison_slab(struct slab *slab) {}
static inline void kasan_unpoison_new_object(struct kmem_cache *cache,
void *object) {}
static inline void kasan_poison_new_object(struct kmem_cache *cache,
void *object) {}
static inline void *kasan_init_slab_obj(struct kmem_cache *cache,
const void *object)
{
return (void *)object;
}
static inline bool kasan_slab_free(struct kmem_cache *s, void *object, bool init)
{
return false;
}
static inline void kasan_kfree_large(void *ptr) {}
static inline void *kasan_slab_alloc(struct kmem_cache *s, void *object,
gfp_t flags, bool init)
{
return object;
}
static inline void *kasan_kmalloc(struct kmem_cache *s, const void *object,
size_t size, gfp_t flags)
{
return (void *)object;
}
static inline void *kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags)
{
return (void *)ptr;
}
static inline void *kasan_krealloc(const void *object, size_t new_size,
gfp_t flags)
{
return (void *)object;
}
static inline bool kasan_mempool_poison_pages(struct page *page, unsigned int order)
{
return true;
}
static inline void kasan_mempool_unpoison_pages(struct page *page, unsigned int order) {}
static inline bool kasan_mempool_poison_object(void *ptr)
{
return true;
}
static inline void kasan_mempool_unpoison_object(void *ptr, size_t size) {}
static inline bool kasan_check_byte(const void *address)
{
return true;
}
#endif /* CONFIG_KASAN */
#if defined(CONFIG_KASAN) && defined(CONFIG_KASAN_STACK)
void kasan_unpoison_task_stack(struct task_struct *task);
asmlinkage void kasan_unpoison_task_stack_below(const void *watermark);
#else
static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
static inline void kasan_unpoison_task_stack_below(const void *watermark) {}
#endif
#ifdef CONFIG_KASAN_GENERIC
struct kasan_cache {
int alloc_meta_offset;
int free_meta_offset;
};
size_t kasan_metadata_size(struct kmem_cache *cache, bool in_object);
slab_flags_t kasan_never_merge(void);
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_record_aux_stack(void *ptr);
void kasan_record_aux_stack_noalloc(void *ptr);
#else /* CONFIG_KASAN_GENERIC */
/* Tag-based KASAN modes do not use per-object metadata. */
static inline size_t kasan_metadata_size(struct kmem_cache *cache,
bool in_object)
{
return 0;
}
/* And thus nothing prevents cache merging. */
static inline slab_flags_t kasan_never_merge(void)
{
return 0;
}
/* And no cache-related metadata initialization is required. */
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_record_aux_stack(void *ptr) {}
static inline void kasan_record_aux_stack_noalloc(void *ptr) {}
#endif /* CONFIG_KASAN_GENERIC */
#if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS)
static inline void *kasan_reset_tag(const void *addr)
{
return (void *)arch_kasan_reset_tag(addr);
}
/**
* kasan_report - print a report about a bad memory access detected by KASAN
* @addr: address of the bad access
* @size: size of the bad access
* @is_write: whether the bad access is a write or a read
* @ip: instruction pointer for the accessibility check or the bad access itself
*/
bool kasan_report(const void *addr, size_t size,
bool is_write, unsigned long ip);
#else /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */
static inline void *kasan_reset_tag(const void *addr)
{
return (void *)addr;
}
#endif /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS*/
#ifdef CONFIG_KASAN_HW_TAGS
void kasan_report_async(void);
#endif /* CONFIG_KASAN_HW_TAGS */
#ifdef CONFIG_KASAN_SW_TAGS
void __init kasan_init_sw_tags(void);
#else
static inline void kasan_init_sw_tags(void) { }
#endif
#ifdef CONFIG_KASAN_HW_TAGS
void kasan_init_hw_tags_cpu(void);
void __init kasan_init_hw_tags(void);
#else
static inline void kasan_init_hw_tags_cpu(void) { }
static inline void kasan_init_hw_tags(void) { }
#endif
#ifdef CONFIG_KASAN_VMALLOC
#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
void kasan_populate_early_vm_area_shadow(void *start, unsigned long size);
int kasan_populate_vmalloc(unsigned long addr, unsigned long size);
void kasan_release_vmalloc(unsigned long start, unsigned long end,
unsigned long free_region_start,
unsigned long free_region_end);
#else /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
static inline void kasan_populate_early_vm_area_shadow(void *start,
unsigned long size)
{ }
static inline int kasan_populate_vmalloc(unsigned long start,
unsigned long size)
{
return 0;
}
static inline void kasan_release_vmalloc(unsigned long start,
unsigned long end,
unsigned long free_region_start,
unsigned long free_region_end) { }
#endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
void *__kasan_unpoison_vmalloc(const void *start, unsigned long size,
kasan_vmalloc_flags_t flags);
static __always_inline void *kasan_unpoison_vmalloc(const void *start,
unsigned long size,
kasan_vmalloc_flags_t flags)
{
if (kasan_enabled())
return __kasan_unpoison_vmalloc(start, size, flags);
return (void *)start;
}
void __kasan_poison_vmalloc(const void *start, unsigned long size);
static __always_inline void kasan_poison_vmalloc(const void *start,
unsigned long size)
{
if (kasan_enabled())
__kasan_poison_vmalloc(start, size);
}
#else /* CONFIG_KASAN_VMALLOC */
static inline void kasan_populate_early_vm_area_shadow(void *start,
unsigned long size) { }
static inline int kasan_populate_vmalloc(unsigned long start,
unsigned long size)
{
return 0;
}
static inline void kasan_release_vmalloc(unsigned long start,
unsigned long end,
unsigned long free_region_start,
unsigned long free_region_end) { }
static inline void *kasan_unpoison_vmalloc(const void *start,
unsigned long size,
kasan_vmalloc_flags_t flags)
{
return (void *)start;
}
static inline void kasan_poison_vmalloc(const void *start, unsigned long size)
{ }
#endif /* CONFIG_KASAN_VMALLOC */
#if (defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)) && \
!defined(CONFIG_KASAN_VMALLOC)
/*
* These functions allocate and free shadow memory for kernel modules.
* They are only required when KASAN_VMALLOC is not supported, as otherwise
* shadow memory is allocated by the generic vmalloc handlers.
*/
int kasan_alloc_module_shadow(void *addr, size_t size, gfp_t gfp_mask);
void kasan_free_module_shadow(const struct vm_struct *vm);
#else /* (CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS) && !CONFIG_KASAN_VMALLOC */
static inline int kasan_alloc_module_shadow(void *addr, size_t size, gfp_t gfp_mask) { return 0; }
static inline void kasan_free_module_shadow(const struct vm_struct *vm) {}
#endif /* (CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS) && !CONFIG_KASAN_VMALLOC */
#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
void kasan_non_canonical_hook(unsigned long addr);
#else /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
static inline void kasan_non_canonical_hook(unsigned long addr) { }
#endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
#endif /* LINUX_KASAN_H */
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