diff options
Diffstat (limited to 'include/linux/kasan.h')
| -rw-r--r-- | include/linux/kasan.h | 647 |
1 files changed, 531 insertions, 116 deletions
diff --git a/include/linux/kasan.h b/include/linux/kasan.h index 30d343b4a40a..890011071f2b 100644 --- a/include/linux/kasan.h +++ b/include/linux/kasan.h @@ -2,38 +2,72 @@ #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/pgtable.h> +#include <linux/linkage.h> #include <asm/kasan.h> -/* kasan_data struct is used in KUnit tests for KASAN expected failures */ -struct kunit_kasan_expectation { - bool report_expected; - bool report_found; -}; +#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) + +#define KASAN_VMALLOC_PAGE_RANGE 0x1 /* Apply exsiting page range */ +#define KASAN_VMALLOC_TLB_FLUSH 0x2 /* TLB flush */ + +#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[PTRS_PER_PTE]; -extern pmd_t kasan_early_shadow_pmd[PTRS_PER_PMD]; -extern pud_t kasan_early_shadow_pud[PTRS_PER_PUD]; +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); @@ -41,86 +75,345 @@ 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); +#else /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */ -void kasan_unpoison_task_stack(struct task_struct *task); +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) +{} -void kasan_alloc_pages(struct page *page, unsigned int order); -void kasan_free_pages(struct page *page, unsigned int order); +static inline void kasan_enable_current(void) {} +static inline void kasan_disable_current(void) {} -void kasan_cache_create(struct kmem_cache *cache, unsigned int *size, - slab_flags_t *flags); +#endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */ -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 * __must_check kasan_init_slab_obj(struct kmem_cache *cache, - const void *object); - -void * __must_check 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 * __must_check kasan_kmalloc(struct kmem_cache *s, const void *object, - size_t size, gfp_t flags); -void * __must_check kasan_krealloc(const void *object, size_t new_size, - gfp_t flags); - -void * __must_check 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); +#ifdef CONFIG_KASAN_HW_TAGS -struct kasan_cache { - int alloc_meta_offset; - int free_meta_offset; -}; +#else /* CONFIG_KASAN_HW_TAGS */ -/* - * These functions provide a special case to support backing module - * allocations with real shadow memory. With KASAN vmalloc, the special - * case is unnecessary, as the work is handled in the generic case. +#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(). */ -#ifndef CONFIG_KASAN_VMALLOC -int kasan_module_alloc(void *addr, size_t size); -void kasan_free_shadow(const struct vm_struct *vm); -#else -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 +static __always_inline void kasan_unpoison_new_object(struct kmem_cache *cache, + void *object) +{ + if (kasan_enabled()) + __kasan_unpoison_new_object(cache, object); +} -int kasan_add_zero_shadow(void *start, unsigned long size); -void kasan_remove_zero_shadow(void *start, unsigned long size); +void __kasan_poison_new_object(struct kmem_cache *cache, void *object); +/** + * kasan_poison_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); +} -size_t __ksize(const void *); -static inline void kasan_unpoison_slab(const void *ptr) +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) { - kasan_unpoison_shadow(ptr, __ksize(ptr)); + if (kasan_enabled()) + return __kasan_init_slab_obj(cache, object); + return (void *)object; } -size_t kasan_metadata_size(struct kmem_cache *cache); -bool kasan_save_enable_multi_shot(void); -void kasan_restore_multi_shot(bool enabled); +bool __kasan_slab_pre_free(struct kmem_cache *s, void *object, + unsigned long ip); +/** + * kasan_slab_pre_free - Check whether freeing a slab object is safe. + * @object: Object to be freed. + * + * This function checks whether freeing the given object is safe. It may + * check for double-free and invalid-free bugs and report them. + * + * This function is intended only for use by the slab allocator. + * + * @Return true if freeing the object is unsafe; false otherwise. + */ +static __always_inline bool kasan_slab_pre_free(struct kmem_cache *s, + void *object) +{ + if (kasan_enabled()) + return __kasan_slab_pre_free(s, object, _RET_IP_); + return false; +} -#else /* CONFIG_KASAN */ +bool __kasan_slab_free(struct kmem_cache *s, void *object, bool init, + bool still_accessible); +/** + * kasan_slab_free - Poison, initialize, and quarantine a slab object. + * @object: Object to be freed. + * @init: Whether to initialize the object. + * @still_accessible: Whether the object contents are still accessible. + * + * This function informs that a slab object has been freed and is not + * supposed to be accessed anymore, except when @still_accessible is set + * (indicating that the object is in a SLAB_TYPESAFE_BY_RCU cache and an RCU + * grace period might not have passed yet). + * + * For KASAN modes that have integrated memory initialization + * (kasan_has_integrated_init() == true), this function also initializes + * the object's memory. For other modes, the @init argument is ignored. + * + * This function might also take ownership of the object to quarantine it. + * When this happens, KASAN will defer freeing the object to a later + * stage and handle it internally until then. The return value indicates + * whether KASAN took ownership of the object. + * + * This function is intended only for use by the slab allocator. + * + * @Return true if KASAN took ownership of the object; false otherwise. + */ +static __always_inline bool kasan_slab_free(struct kmem_cache *s, + void *object, bool init, + bool still_accessible) +{ + if (kasan_enabled()) + return __kasan_slab_free(s, object, init, still_accessible); + return false; +} -static inline void kasan_unpoison_shadow(const void *address, size_t size) {} +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_); +} -static inline void kasan_unpoison_task_stack(struct task_struct *task) {} +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; +} -static inline void kasan_enable_current(void) {} -static inline void kasan_disable_current(void) {} +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; +} -static inline void kasan_alloc_pages(struct page *page, unsigned int order) {} -static inline void kasan_free_pages(struct page *page, unsigned int order) {} +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; +} -static inline void kasan_cache_create(struct kmem_cache *cache, - unsigned int *size, - slab_flags_t *flags) {} +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; +} -static inline void kasan_poison_slab(struct page *page) {} -static inline void kasan_unpoison_object_data(struct kmem_cache *cache, +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_object_data(struct kmem_cache *cache, +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) @@ -128,53 +421,72 @@ static inline void *kasan_init_slab_obj(struct kmem_cache *cache, return (void *)object; } -static inline void *kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags) +static inline bool kasan_slab_pre_free(struct kmem_cache *s, void *object) +{ + return false; +} + +static inline bool kasan_slab_free(struct kmem_cache *s, void *object, + bool init, bool still_accessible) { - return ptr; + 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_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) { 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 void *kasan_slab_alloc(struct kmem_cache *s, void *object, - gfp_t flags) +static inline bool kasan_mempool_poison_pages(struct page *page, unsigned int order) { - return object; + return true; } -static inline bool kasan_slab_free(struct kmem_cache *s, void *object, - unsigned long ip) +static inline void kasan_mempool_unpoison_pages(struct page *page, unsigned int order) {} +static inline bool kasan_mempool_poison_object(void *ptr) { - return false; + return true; } +static inline void kasan_mempool_unpoison_object(void *ptr, size_t size) {} -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) +static inline bool kasan_check_byte(const void *address) { - return 0; + return true; } -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 */ +#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 -#define KASAN_SHADOW_INIT 0 +struct kasan_cache { + int alloc_meta_offset; + int free_meta_offset; +}; + +size_t kasan_metadata_size(struct kmem_cache *cache, bool in_object); +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); @@ -182,62 +494,165 @@ void kasan_record_aux_stack(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 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) {} #endif /* CONFIG_KASAN_GENERIC */ -#ifdef CONFIG_KASAN_SW_TAGS - -#define KASAN_SHADOW_INIT 0xFF +#if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS) -void kasan_init_tags(void); - -void *kasan_reset_tag(const void *addr); +static inline void *kasan_reset_tag(const void *addr) +{ + return (void *)arch_kasan_reset_tag(addr); +} -bool kasan_report(unsigned long addr, size_t size, +/** + * 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 */ - -static inline void kasan_init_tags(void) { } +#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 */ +#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_poison_vmalloc(const void *start, unsigned long size); -void kasan_unpoison_vmalloc(const void *start, unsigned long size); void kasan_release_vmalloc(unsigned long start, unsigned long end, unsigned long free_region_start, - unsigned long free_region_end); -#else + unsigned long free_region_end, + unsigned long flags); + +#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, + unsigned long flags) { } -static inline void kasan_poison_vmalloc(const void *start, unsigned long size) -{ } -static inline void kasan_unpoison_vmalloc(const void *start, unsigned long size) -{ } +#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) {} -#endif + unsigned long free_region_end, + unsigned long flags) { } + +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 +#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) void kasan_non_canonical_hook(unsigned long addr); -#else /* CONFIG_KASAN_INLINE */ +#else /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */ static inline void kasan_non_canonical_hook(unsigned long addr) { } -#endif /* CONFIG_KASAN_INLINE */ +#endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */ #endif /* LINUX_KASAN_H */ |