542 lines
17 KiB
C
542 lines
17 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/kasan-tags.h>
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#include <linux/kfence.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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#include "../slab.h"
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DECLARE_STATIC_KEY_FALSE(kasan_flag_stacktrace);
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enum kasan_mode {
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KASAN_MODE_SYNC,
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KASAN_MODE_ASYNC,
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KASAN_MODE_ASYMM,
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};
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extern enum kasan_mode kasan_mode __ro_after_init;
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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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static inline bool kasan_async_fault_possible(void)
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{
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return kasan_mode == KASAN_MODE_ASYNC || kasan_mode == KASAN_MODE_ASYMM;
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}
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static inline bool kasan_sync_fault_possible(void)
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{
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return kasan_mode == KASAN_MODE_SYNC || kasan_mode == KASAN_MODE_ASYMM;
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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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static inline bool kasan_async_fault_possible(void)
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{
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return false;
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}
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static inline bool kasan_sync_fault_possible(void)
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{
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return true;
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}
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#endif
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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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#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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#if defined(CONFIG_KASAN_TAGS_IDENTIFY) && defined(CONFIG_KASAN_SW_TAGS)
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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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* The auxiliary 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_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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* kasan_check_range - 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 kasan_check_range(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 (is_vmalloc_addr(addr) || virt_addr_valid(addr));
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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 kasan_print_tags(u8 addr_tag, const void *addr);
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#else
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static inline void kasan_print_tags(u8 addr_tag, const void *addr) { }
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#endif
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void *kasan_find_first_bad_addr(void *addr, size_t size);
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const char *kasan_get_bug_type(struct kasan_access_info *info);
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void kasan_metadata_fetch_row(char *buffer, void *row);
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#if defined(CONFIG_KASAN_GENERIC) && defined(CONFIG_KASAN_STACK)
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void kasan_print_address_stack_frame(const void *addr);
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#else
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static inline void kasan_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, bool can_alloc);
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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 kasan_quarantine_put(struct kmem_cache *cache, void *object);
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void kasan_quarantine_reduce(void);
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void kasan_quarantine_remove_cache(struct kmem_cache *cache);
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#else
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static inline bool kasan_quarantine_put(struct kmem_cache *cache, void *object) { return false; }
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static inline void kasan_quarantine_reduce(void) { }
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static inline void kasan_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_sync
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#define arch_enable_tagging_sync()
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#endif
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#ifndef arch_enable_tagging_async
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#define arch_enable_tagging_async()
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#endif
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#ifndef arch_enable_tagging_asymm
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#define arch_enable_tagging_asymm()
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#endif
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#ifndef arch_force_async_tag_fault
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#define arch_force_async_tag_fault()
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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, init) ((void *)(addr))
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#endif
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#define hw_enable_tagging_sync() arch_enable_tagging_sync()
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#define hw_enable_tagging_async() arch_enable_tagging_async()
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#define hw_enable_tagging_asymm() arch_enable_tagging_asymm()
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#define hw_force_async_tag_fault() arch_force_async_tag_fault()
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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, init) \
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arch_set_mem_tag_range((addr), (size), (tag), (init))
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#else /* CONFIG_KASAN_HW_TAGS */
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#define hw_enable_tagging_sync()
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#define hw_enable_tagging_async()
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#define hw_enable_tagging_asymm()
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#endif /* CONFIG_KASAN_HW_TAGS */
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#if defined(CONFIG_KASAN_HW_TAGS) && IS_ENABLED(CONFIG_KASAN_KUNIT_TEST)
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void kasan_enable_tagging_sync(void);
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void kasan_force_async_fault(void);
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#else /* CONFIG_KASAN_HW_TAGS || CONFIG_KASAN_KUNIT_TEST */
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static inline void kasan_enable_tagging_sync(void) { }
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static inline void kasan_force_async_fault(void) { }
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#endif /* CONFIG_KASAN_HW_TAGS || CONFIG_KASAN_KUNIT_TEST */
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#ifdef CONFIG_KASAN_SW_TAGS
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u8 kasan_random_tag(void);
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#elif defined(CONFIG_KASAN_HW_TAGS)
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static inline u8 kasan_random_tag(void) { return hw_get_random_tag(); }
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#else
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static inline u8 kasan_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 kasan_poison(const void *addr, size_t size, u8 value, bool init)
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{
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addr = kasan_reset_tag(addr);
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/* Skip KFENCE memory if called explicitly outside of sl*b. */
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if (is_kfence_address(addr))
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return;
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if (WARN_ON((unsigned long)addr & KASAN_GRANULE_MASK))
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return;
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if (WARN_ON(size & KASAN_GRANULE_MASK))
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return;
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hw_set_mem_tag_range((void *)addr, size, value, init);
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}
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static inline void kasan_unpoison(const void *addr, size_t size, bool init)
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{
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u8 tag = get_tag(addr);
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addr = kasan_reset_tag(addr);
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/* Skip KFENCE memory if called explicitly outside of sl*b. */
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if (is_kfence_address(addr))
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return;
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if (WARN_ON((unsigned long)addr & KASAN_GRANULE_MASK))
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return;
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/*
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* Explicitly initialize the memory with the precise object size to
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* avoid overwriting the SLAB redzone. This disables initialization in
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* the arch code and may thus lead to performance penalty. The penalty
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* is accepted since SLAB redzones aren't enabled in production builds.
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*/
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if (__slub_debug_enabled() &&
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init && ((unsigned long)size & KASAN_GRANULE_MASK)) {
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init = false;
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memzero_explicit((void *)addr, size);
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}
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size = round_up(size, KASAN_GRANULE_SIZE);
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hw_set_mem_tag_range((void *)addr, size, tag, init);
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}
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static inline bool kasan_byte_accessible(const 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((void *)addr);
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return 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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/**
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* kasan_poison - mark the memory range as inaccessible
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* @addr - range start address, must be aligned to KASAN_GRANULE_SIZE
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* @size - range size, must be aligned to KASAN_GRANULE_SIZE
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* @value - value that's written to metadata for the range
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* @init - whether to initialize the memory range (only for hardware tag-based)
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*
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* The size gets aligned to KASAN_GRANULE_SIZE before marking the range.
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*/
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void kasan_poison(const void *addr, size_t size, u8 value, bool init);
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/**
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* kasan_unpoison - mark the memory range as accessible
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* @addr - range start address, must be aligned to KASAN_GRANULE_SIZE
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* @size - range size, can be unaligned
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* @init - whether to initialize the memory range (only for hardware tag-based)
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*
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* For the tag-based modes, the @size gets aligned to KASAN_GRANULE_SIZE before
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* marking the range.
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* For the generic mode, the last granule of the memory range gets partially
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* unpoisoned based on the @size.
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*/
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void kasan_unpoison(const void *addr, size_t size, bool init);
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bool kasan_byte_accessible(const void *addr);
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#endif /* CONFIG_KASAN_HW_TAGS */
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#ifdef CONFIG_KASAN_GENERIC
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/**
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* kasan_poison_last_granule - mark the last granule of the memory range as
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* inaccessible
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* @addr - range start address, must be aligned to KASAN_GRANULE_SIZE
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* @size - range size
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*
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* This function is only available for the generic mode, as it's the only mode
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* that has partially poisoned memory granules.
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*/
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void kasan_poison_last_granule(const void *address, size_t size);
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#else /* CONFIG_KASAN_GENERIC */
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static inline void kasan_poison_last_granule(const void *address, size_t size) { }
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#endif /* CONFIG_KASAN_GENERIC */
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#ifndef kasan_arch_is_ready
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static inline bool kasan_arch_is_ready(void) { return true; }
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#elif !defined(CONFIG_KASAN_GENERIC) || !defined(CONFIG_KASAN_OUTLINE)
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#error kasan_arch_is_ready only works in KASAN generic outline mode!
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#endif
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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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