407 lines
13 KiB
C
407 lines
13 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __MM_KASAN_KASAN_H
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#define __MM_KASAN_KASAN_H
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#include <linux/kasan.h>
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#include <linux/stackdepot.h>
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#ifdef CONFIG_KASAN_HW_TAGS
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#include <linux/static_key.h>
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DECLARE_STATIC_KEY_FALSE(kasan_flag_stacktrace);
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static inline bool kasan_stack_collection_enabled(void)
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{
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return static_branch_unlikely(&kasan_flag_stacktrace);
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}
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#else
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static inline bool kasan_stack_collection_enabled(void)
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{
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return true;
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}
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#endif
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extern bool kasan_flag_panic __ro_after_init;
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#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
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#define KASAN_GRANULE_SIZE (1UL << KASAN_SHADOW_SCALE_SHIFT)
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#else
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#include <asm/mte-kasan.h>
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#define KASAN_GRANULE_SIZE MTE_GRANULE_SIZE
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#endif
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#define KASAN_GRANULE_MASK (KASAN_GRANULE_SIZE - 1)
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#define KASAN_MEMORY_PER_SHADOW_PAGE (KASAN_GRANULE_SIZE << PAGE_SHIFT)
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#define KASAN_TAG_KERNEL 0xFF /* native kernel pointers tag */
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#define KASAN_TAG_INVALID 0xFE /* inaccessible memory tag */
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#define KASAN_TAG_MAX 0xFD /* maximum value for random tags */
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#ifdef CONFIG_KASAN_GENERIC
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#define KASAN_FREE_PAGE 0xFF /* page was freed */
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#define KASAN_PAGE_REDZONE 0xFE /* redzone for kmalloc_large allocations */
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#define KASAN_KMALLOC_REDZONE 0xFC /* redzone inside slub object */
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#define KASAN_KMALLOC_FREE 0xFB /* object was freed (kmem_cache_free/kfree) */
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#define KASAN_KMALLOC_FREETRACK 0xFA /* object was freed and has free track set */
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#else
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#define KASAN_FREE_PAGE KASAN_TAG_INVALID
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#define KASAN_PAGE_REDZONE KASAN_TAG_INVALID
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#define KASAN_KMALLOC_REDZONE KASAN_TAG_INVALID
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#define KASAN_KMALLOC_FREE KASAN_TAG_INVALID
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#define KASAN_KMALLOC_FREETRACK KASAN_TAG_INVALID
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#endif
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#define KASAN_GLOBAL_REDZONE 0xF9 /* redzone for global variable */
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#define KASAN_VMALLOC_INVALID 0xF8 /* unallocated space in vmapped page */
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/*
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* Stack redzone shadow values
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* (Those are compiler's ABI, don't change them)
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*/
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#define KASAN_STACK_LEFT 0xF1
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#define KASAN_STACK_MID 0xF2
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#define KASAN_STACK_RIGHT 0xF3
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#define KASAN_STACK_PARTIAL 0xF4
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/*
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* alloca redzone shadow values
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*/
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#define KASAN_ALLOCA_LEFT 0xCA
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#define KASAN_ALLOCA_RIGHT 0xCB
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#define KASAN_ALLOCA_REDZONE_SIZE 32
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/*
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* Stack frame marker (compiler ABI).
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*/
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#define KASAN_CURRENT_STACK_FRAME_MAGIC 0x41B58AB3
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/* Don't break randconfig/all*config builds */
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#ifndef KASAN_ABI_VERSION
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#define KASAN_ABI_VERSION 1
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#endif
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/* Metadata layout customization. */
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#define META_BYTES_PER_BLOCK 1
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#define META_BLOCKS_PER_ROW 16
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#define META_BYTES_PER_ROW (META_BLOCKS_PER_ROW * META_BYTES_PER_BLOCK)
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#define META_MEM_BYTES_PER_ROW (META_BYTES_PER_ROW * KASAN_GRANULE_SIZE)
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#define META_ROWS_AROUND_ADDR 2
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struct kasan_access_info {
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const void *access_addr;
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const void *first_bad_addr;
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size_t access_size;
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bool is_write;
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unsigned long ip;
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};
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/* The layout of struct dictated by compiler */
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struct kasan_source_location {
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const char *filename;
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int line_no;
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int column_no;
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};
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/* The layout of struct dictated by compiler */
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struct kasan_global {
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const void *beg; /* Address of the beginning of the global variable. */
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size_t size; /* Size of the global variable. */
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size_t size_with_redzone; /* Size of the variable + size of the red zone. 32 bytes aligned */
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const void *name;
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const void *module_name; /* Name of the module where the global variable is declared. */
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unsigned long has_dynamic_init; /* This needed for C++ */
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#if KASAN_ABI_VERSION >= 4
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struct kasan_source_location *location;
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#endif
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#if KASAN_ABI_VERSION >= 5
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char *odr_indicator;
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#endif
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};
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/**
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* Structures to keep alloc and free tracks *
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*/
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#define KASAN_STACK_DEPTH 64
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struct kasan_track {
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u32 pid;
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depot_stack_handle_t stack;
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};
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#ifdef CONFIG_KASAN_SW_TAGS_IDENTIFY
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#define KASAN_NR_FREE_STACKS 5
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#else
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#define KASAN_NR_FREE_STACKS 1
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#endif
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struct kasan_alloc_meta {
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struct kasan_track alloc_track;
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#ifdef CONFIG_KASAN_GENERIC
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/*
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* call_rcu() call stack is stored into struct kasan_alloc_meta.
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* The free stack is stored into struct kasan_free_meta.
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*/
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depot_stack_handle_t aux_stack[2];
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#else
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struct kasan_track free_track[KASAN_NR_FREE_STACKS];
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#endif
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#ifdef CONFIG_KASAN_SW_TAGS_IDENTIFY
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u8 free_pointer_tag[KASAN_NR_FREE_STACKS];
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u8 free_track_idx;
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#endif
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};
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struct qlist_node {
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struct qlist_node *next;
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};
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/*
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* Generic mode either stores free meta in the object itself or in the redzone
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* after the object. In the former case free meta offset is 0, in the latter
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* case it has some sane value smaller than INT_MAX. Use INT_MAX as free meta
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* offset when free meta isn't present.
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*/
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#define KASAN_NO_FREE_META INT_MAX
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struct kasan_free_meta {
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#ifdef CONFIG_KASAN_GENERIC
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/* This field is used while the object is in the quarantine.
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* Otherwise it might be used for the allocator freelist.
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*/
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struct qlist_node quarantine_link;
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struct kasan_track free_track;
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#endif
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};
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struct kasan_alloc_meta *kasan_get_alloc_meta(struct kmem_cache *cache,
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const void *object);
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#ifdef CONFIG_KASAN_GENERIC
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struct kasan_free_meta *kasan_get_free_meta(struct kmem_cache *cache,
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const void *object);
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#endif
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#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
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static inline const void *kasan_shadow_to_mem(const void *shadow_addr)
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{
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return (void *)(((unsigned long)shadow_addr - KASAN_SHADOW_OFFSET)
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<< KASAN_SHADOW_SCALE_SHIFT);
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}
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static inline bool addr_has_metadata(const void *addr)
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{
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return (addr >= kasan_shadow_to_mem((void *)KASAN_SHADOW_START));
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}
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/**
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* check_memory_region - Check memory region, and report if invalid access.
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* @addr: the accessed address
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* @size: the accessed size
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* @write: true if access is a write access
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* @ret_ip: return address
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* @return: true if access was valid, false if invalid
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*/
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bool check_memory_region(unsigned long addr, size_t size, bool write,
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unsigned long ret_ip);
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#else /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
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static inline bool addr_has_metadata(const void *addr)
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{
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return true;
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}
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#endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
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#if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS)
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void print_tags(u8 addr_tag, const void *addr);
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#else
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static inline void print_tags(u8 addr_tag, const void *addr) { }
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#endif
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void *find_first_bad_addr(void *addr, size_t size);
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const char *get_bug_type(struct kasan_access_info *info);
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void metadata_fetch_row(char *buffer, void *row);
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#if defined(CONFIG_KASAN_GENERIC) && CONFIG_KASAN_STACK
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void print_address_stack_frame(const void *addr);
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#else
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static inline void print_address_stack_frame(const void *addr) { }
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#endif
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bool kasan_report(unsigned long addr, size_t size,
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bool is_write, unsigned long ip);
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void kasan_report_invalid_free(void *object, unsigned long ip);
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struct page *kasan_addr_to_page(const void *addr);
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depot_stack_handle_t kasan_save_stack(gfp_t flags);
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void kasan_set_track(struct kasan_track *track, gfp_t flags);
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void kasan_set_free_info(struct kmem_cache *cache, void *object, u8 tag);
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struct kasan_track *kasan_get_free_track(struct kmem_cache *cache,
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void *object, u8 tag);
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#if defined(CONFIG_KASAN_GENERIC) && \
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(defined(CONFIG_SLAB) || defined(CONFIG_SLUB))
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bool quarantine_put(struct kmem_cache *cache, void *object);
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void quarantine_reduce(void);
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void quarantine_remove_cache(struct kmem_cache *cache);
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#else
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static inline bool quarantine_put(struct kmem_cache *cache, void *object) { return false; }
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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
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#ifndef arch_kasan_set_tag
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static inline const void *arch_kasan_set_tag(const void *addr, u8 tag)
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{
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return addr;
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}
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#endif
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#ifndef arch_kasan_get_tag
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#define arch_kasan_get_tag(addr) 0
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#endif
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#define set_tag(addr, tag) ((void *)arch_kasan_set_tag((addr), (tag)))
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#define get_tag(addr) arch_kasan_get_tag(addr)
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#ifdef CONFIG_KASAN_HW_TAGS
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#ifndef arch_enable_tagging
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#define arch_enable_tagging()
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#endif
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#ifndef arch_init_tags
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#define arch_init_tags(max_tag)
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#endif
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#ifndef arch_get_random_tag
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#define arch_get_random_tag() (0xFF)
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#endif
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#ifndef arch_get_mem_tag
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#define arch_get_mem_tag(addr) (0xFF)
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#endif
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#ifndef arch_set_mem_tag_range
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#define arch_set_mem_tag_range(addr, size, tag) ((void *)(addr))
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#endif
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#define hw_enable_tagging() arch_enable_tagging()
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#define hw_init_tags(max_tag) arch_init_tags(max_tag)
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#define hw_get_random_tag() arch_get_random_tag()
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#define hw_get_mem_tag(addr) arch_get_mem_tag(addr)
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#define hw_set_mem_tag_range(addr, size, tag) arch_set_mem_tag_range((addr), (size), (tag))
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#endif /* CONFIG_KASAN_HW_TAGS */
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#ifdef CONFIG_KASAN_SW_TAGS
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u8 random_tag(void);
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#elif defined(CONFIG_KASAN_HW_TAGS)
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static inline u8 random_tag(void) { return hw_get_random_tag(); }
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#else
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static inline u8 random_tag(void) { return 0; }
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#endif
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#ifdef CONFIG_KASAN_HW_TAGS
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static inline void poison_range(const void *address, size_t size, u8 value)
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{
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hw_set_mem_tag_range(kasan_reset_tag(address),
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round_up(size, KASAN_GRANULE_SIZE), value);
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}
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static inline void unpoison_range(const void *address, size_t size)
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{
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hw_set_mem_tag_range(kasan_reset_tag(address),
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round_up(size, KASAN_GRANULE_SIZE), get_tag(address));
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}
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static inline bool check_invalid_free(void *addr)
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{
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u8 ptr_tag = get_tag(addr);
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u8 mem_tag = hw_get_mem_tag(addr);
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return (mem_tag == KASAN_TAG_INVALID) ||
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(ptr_tag != KASAN_TAG_KERNEL && ptr_tag != mem_tag);
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}
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#else /* CONFIG_KASAN_HW_TAGS */
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void poison_range(const void *address, size_t size, u8 value);
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void unpoison_range(const void *address, size_t size);
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bool check_invalid_free(void *addr);
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#endif /* CONFIG_KASAN_HW_TAGS */
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/*
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* Exported functions for interfaces called from assembly or from generated
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* code. Declarations here to avoid warning about missing declarations.
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*/
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asmlinkage void kasan_unpoison_task_stack_below(const void *watermark);
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void __asan_register_globals(struct kasan_global *globals, size_t size);
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void __asan_unregister_globals(struct kasan_global *globals, size_t size);
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void __asan_handle_no_return(void);
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void __asan_alloca_poison(unsigned long addr, size_t size);
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void __asan_allocas_unpoison(const void *stack_top, const void *stack_bottom);
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void __asan_load1(unsigned long addr);
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void __asan_store1(unsigned long addr);
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void __asan_load2(unsigned long addr);
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void __asan_store2(unsigned long addr);
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void __asan_load4(unsigned long addr);
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void __asan_store4(unsigned long addr);
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void __asan_load8(unsigned long addr);
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void __asan_store8(unsigned long addr);
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void __asan_load16(unsigned long addr);
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void __asan_store16(unsigned long addr);
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void __asan_loadN(unsigned long addr, size_t size);
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void __asan_storeN(unsigned long addr, size_t size);
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void __asan_load1_noabort(unsigned long addr);
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void __asan_store1_noabort(unsigned long addr);
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void __asan_load2_noabort(unsigned long addr);
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void __asan_store2_noabort(unsigned long addr);
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void __asan_load4_noabort(unsigned long addr);
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void __asan_store4_noabort(unsigned long addr);
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void __asan_load8_noabort(unsigned long addr);
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void __asan_store8_noabort(unsigned long addr);
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void __asan_load16_noabort(unsigned long addr);
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void __asan_store16_noabort(unsigned long addr);
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void __asan_loadN_noabort(unsigned long addr, size_t size);
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void __asan_storeN_noabort(unsigned long addr, size_t size);
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void __asan_report_load1_noabort(unsigned long addr);
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void __asan_report_store1_noabort(unsigned long addr);
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void __asan_report_load2_noabort(unsigned long addr);
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void __asan_report_store2_noabort(unsigned long addr);
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void __asan_report_load4_noabort(unsigned long addr);
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void __asan_report_store4_noabort(unsigned long addr);
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void __asan_report_load8_noabort(unsigned long addr);
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void __asan_report_store8_noabort(unsigned long addr);
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void __asan_report_load16_noabort(unsigned long addr);
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void __asan_report_store16_noabort(unsigned long addr);
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void __asan_report_load_n_noabort(unsigned long addr, size_t size);
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void __asan_report_store_n_noabort(unsigned long addr, size_t size);
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void __asan_set_shadow_00(const void *addr, size_t size);
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void __asan_set_shadow_f1(const void *addr, size_t size);
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void __asan_set_shadow_f2(const void *addr, size_t size);
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void __asan_set_shadow_f3(const void *addr, size_t size);
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void __asan_set_shadow_f5(const void *addr, size_t size);
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void __asan_set_shadow_f8(const void *addr, size_t size);
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void __hwasan_load1_noabort(unsigned long addr);
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void __hwasan_store1_noabort(unsigned long addr);
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void __hwasan_load2_noabort(unsigned long addr);
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void __hwasan_store2_noabort(unsigned long addr);
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void __hwasan_load4_noabort(unsigned long addr);
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void __hwasan_store4_noabort(unsigned long addr);
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void __hwasan_load8_noabort(unsigned long addr);
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void __hwasan_store8_noabort(unsigned long addr);
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void __hwasan_load16_noabort(unsigned long addr);
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void __hwasan_store16_noabort(unsigned long addr);
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void __hwasan_loadN_noabort(unsigned long addr, size_t size);
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void __hwasan_storeN_noabort(unsigned long addr, size_t size);
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void __hwasan_tag_memory(unsigned long addr, u8 tag, unsigned long size);
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#endif
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