482 lines
14 KiB
C
482 lines
14 KiB
C
/* 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/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);
|
|
|
|
static inline void *kasan_mem_to_shadow(const void *addr)
|
|
{
|
|
return (void *)((unsigned long)addr >> KASAN_SHADOW_SCALE_SHIFT)
|
|
+ KASAN_SHADOW_OFFSET;
|
|
}
|
|
|
|
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
|
|
|
|
struct kasan_cache {
|
|
#ifdef CONFIG_KASAN_GENERIC
|
|
int alloc_meta_offset;
|
|
int free_meta_offset;
|
|
#endif
|
|
bool is_kmalloc;
|
|
};
|
|
|
|
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);
|
|
}
|
|
|
|
void __kasan_unpoison_pages(struct page *page, unsigned int order, bool init);
|
|
static __always_inline void kasan_unpoison_pages(struct page *page,
|
|
unsigned int order, bool init)
|
|
{
|
|
if (kasan_enabled())
|
|
__kasan_unpoison_pages(page, order, init);
|
|
}
|
|
|
|
void __kasan_cache_create_kmalloc(struct kmem_cache *cache);
|
|
static __always_inline void kasan_cache_create_kmalloc(struct kmem_cache *cache)
|
|
{
|
|
if (kasan_enabled())
|
|
__kasan_cache_create_kmalloc(cache);
|
|
}
|
|
|
|
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_object_data(struct kmem_cache *cache, void *object);
|
|
static __always_inline void kasan_unpoison_object_data(struct kmem_cache *cache,
|
|
void *object)
|
|
{
|
|
if (kasan_enabled())
|
|
__kasan_unpoison_object_data(cache, object);
|
|
}
|
|
|
|
void __kasan_poison_object_data(struct kmem_cache *cache, void *object);
|
|
static __always_inline void kasan_poison_object_data(struct kmem_cache *cache,
|
|
void *object)
|
|
{
|
|
if (kasan_enabled())
|
|
__kasan_poison_object_data(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 __kasan_slab_free_mempool(void *ptr, unsigned long ip);
|
|
static __always_inline void kasan_slab_free_mempool(void *ptr)
|
|
{
|
|
if (kasan_enabled())
|
|
__kasan_slab_free_mempool(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;
|
|
}
|
|
|
|
/*
|
|
* 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 void kasan_unpoison_pages(struct page *page, unsigned int order,
|
|
bool init) {}
|
|
static inline void kasan_cache_create_kmalloc(struct kmem_cache *cache) {}
|
|
static inline void kasan_poison_slab(struct slab *slab) {}
|
|
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)
|
|
{
|
|
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_free_mempool(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_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);
|
|
#else
|
|
static inline void kasan_unpoison_task_stack(struct task_struct *task) {}
|
|
#endif
|
|
|
|
#ifdef CONFIG_KASAN_GENERIC
|
|
|
|
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(unsigned long 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 */
|
|
|
|
#ifdef CONFIG_KASAN_INLINE
|
|
void kasan_non_canonical_hook(unsigned long addr);
|
|
#else /* CONFIG_KASAN_INLINE */
|
|
static inline void kasan_non_canonical_hook(unsigned long addr) { }
|
|
#endif /* CONFIG_KASAN_INLINE */
|
|
|
|
#endif /* LINUX_KASAN_H */
|