diff options
Diffstat (limited to 'mm/kasan/common.c')
| -rw-r--r-- | mm/kasan/common.c | 1069 |
1 files changed, 341 insertions, 728 deletions
diff --git a/mm/kasan/common.c b/mm/kasan/common.c index 757d4074fe28..1d27f1bd260b 100644 --- a/mm/kasan/common.c +++ b/mm/kasan/common.c @@ -1,24 +1,18 @@ // SPDX-License-Identifier: GPL-2.0 /* - * This file contains common generic and tag-based KASAN code. + * This file contains common KASAN code. * * Copyright (c) 2014 Samsung Electronics Co., Ltd. * Author: Andrey Ryabinin <ryabinin.a.a@gmail.com> * * Some code borrowed from https://github.com/xairy/kasan-prototype by * Andrey Konovalov <andreyknvl@gmail.com> - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * */ #include <linux/export.h> #include <linux/init.h> #include <linux/kasan.h> #include <linux/kernel.h> -#include <linux/kmemleak.h> #include <linux/linkage.h> #include <linux/memblock.h> #include <linux/memory.h> @@ -26,145 +20,94 @@ #include <linux/module.h> #include <linux/printk.h> #include <linux/sched.h> +#include <linux/sched/clock.h> #include <linux/sched/task_stack.h> #include <linux/slab.h> +#include <linux/stackdepot.h> #include <linux/stacktrace.h> #include <linux/string.h> #include <linux/types.h> -#include <linux/vmalloc.h> #include <linux/bug.h> -#include <asm/cacheflush.h> -#include <asm/tlbflush.h> - #include "kasan.h" #include "../slab.h" -static inline depot_stack_handle_t save_stack(gfp_t flags) -{ - unsigned long entries[KASAN_STACK_DEPTH]; - unsigned int nr_entries; - - nr_entries = stack_trace_save(entries, ARRAY_SIZE(entries), 0); - nr_entries = filter_irq_stacks(entries, nr_entries); - return stack_depot_save(entries, nr_entries, flags); -} - -static inline void set_track(struct kasan_track *track, gfp_t flags) -{ - track->pid = current->pid; - track->stack = save_stack(flags); -} - -void kasan_enable_current(void) -{ - current->kasan_depth++; -} +#if defined(CONFIG_ARCH_DEFER_KASAN) || defined(CONFIG_KASAN_HW_TAGS) +/* + * Definition of the unified static key declared in kasan-enabled.h. + * This provides consistent runtime enable/disable across KASAN modes. + */ +DEFINE_STATIC_KEY_FALSE(kasan_flag_enabled); +EXPORT_SYMBOL_GPL(kasan_flag_enabled); +#endif -void kasan_disable_current(void) +struct slab *kasan_addr_to_slab(const void *addr) { - current->kasan_depth--; + if (virt_addr_valid(addr)) + return virt_to_slab(addr); + return NULL; } -bool __kasan_check_read(const volatile void *p, unsigned int size) +depot_stack_handle_t kasan_save_stack(gfp_t flags, depot_flags_t depot_flags) { - return check_memory_region((unsigned long)p, size, false, _RET_IP_); -} -EXPORT_SYMBOL(__kasan_check_read); + unsigned long entries[KASAN_STACK_DEPTH]; + unsigned int nr_entries; -bool __kasan_check_write(const volatile void *p, unsigned int size) -{ - return check_memory_region((unsigned long)p, size, true, _RET_IP_); + nr_entries = stack_trace_save(entries, ARRAY_SIZE(entries), 0); + return stack_depot_save_flags(entries, nr_entries, flags, depot_flags); } -EXPORT_SYMBOL(__kasan_check_write); -#undef memset -void *memset(void *addr, int c, size_t len) +void kasan_set_track(struct kasan_track *track, depot_stack_handle_t stack) { - if (!check_memory_region((unsigned long)addr, len, true, _RET_IP_)) - return NULL; +#ifdef CONFIG_KASAN_EXTRA_INFO + u32 cpu = raw_smp_processor_id(); + u64 ts_nsec = local_clock(); - return __memset(addr, c, len); + track->cpu = cpu; + track->timestamp = ts_nsec >> 9; +#endif /* CONFIG_KASAN_EXTRA_INFO */ + track->pid = current->pid; + track->stack = stack; } -#ifdef __HAVE_ARCH_MEMMOVE -#undef memmove -void *memmove(void *dest, const void *src, size_t len) +void kasan_save_track(struct kasan_track *track, gfp_t flags) { - if (!check_memory_region((unsigned long)src, len, false, _RET_IP_) || - !check_memory_region((unsigned long)dest, len, true, _RET_IP_)) - return NULL; + depot_stack_handle_t stack; - return __memmove(dest, src, len); + stack = kasan_save_stack(flags, STACK_DEPOT_FLAG_CAN_ALLOC); + kasan_set_track(track, stack); } -#endif -#undef memcpy -void *memcpy(void *dest, const void *src, size_t len) +#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) +void kasan_enable_current(void) { - if (!check_memory_region((unsigned long)src, len, false, _RET_IP_) || - !check_memory_region((unsigned long)dest, len, true, _RET_IP_)) - return NULL; - - return __memcpy(dest, src, len); + current->kasan_depth++; } +EXPORT_SYMBOL(kasan_enable_current); -/* - * Poisons the shadow memory for 'size' bytes starting from 'addr'. - * Memory addresses should be aligned to KASAN_SHADOW_SCALE_SIZE. - */ -void kasan_poison_shadow(const void *address, size_t size, u8 value) +void kasan_disable_current(void) { - void *shadow_start, *shadow_end; - - /* - * Perform shadow offset calculation based on untagged address, as - * some of the callers (e.g. kasan_poison_object_data) pass tagged - * addresses to this function. - */ - address = reset_tag(address); - - shadow_start = kasan_mem_to_shadow(address); - shadow_end = kasan_mem_to_shadow(address + size); - - __memset(shadow_start, value, shadow_end - shadow_start); + current->kasan_depth--; } +EXPORT_SYMBOL(kasan_disable_current); -void kasan_unpoison_shadow(const void *address, size_t size) -{ - u8 tag = get_tag(address); - - /* - * Perform shadow offset calculation based on untagged address, as - * some of the callers (e.g. kasan_unpoison_object_data) pass tagged - * addresses to this function. - */ - address = reset_tag(address); +#endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */ - kasan_poison_shadow(address, size, tag); - - if (size & KASAN_SHADOW_MASK) { - u8 *shadow = (u8 *)kasan_mem_to_shadow(address + size); - - if (IS_ENABLED(CONFIG_KASAN_SW_TAGS)) - *shadow = tag; - else - *shadow = size & KASAN_SHADOW_MASK; - } -} - -static void __kasan_unpoison_stack(struct task_struct *task, const void *sp) +void __kasan_unpoison_range(const void *address, size_t size) { - void *base = task_stack_page(task); - size_t size = sp - base; + if (is_kfence_address(address)) + return; - kasan_unpoison_shadow(base, size); + kasan_unpoison(address, size, false); } +#ifdef CONFIG_KASAN_STACK /* Unpoison the entire stack for a task. */ void kasan_unpoison_task_stack(struct task_struct *task) { - __kasan_unpoison_stack(task, task_stack_page(task) + THREAD_SIZE); + void *base = task_stack_page(task); + + kasan_unpoison(base, THREAD_SIZE, false); } /* Unpoison the stack for the current task beyond a watermark sp value. */ @@ -177,165 +120,57 @@ asmlinkage void kasan_unpoison_task_stack_below(const void *watermark) */ void *base = (void *)((unsigned long)watermark & ~(THREAD_SIZE - 1)); - kasan_unpoison_shadow(base, watermark - base); + kasan_unpoison(base, watermark - base, false); } +#endif /* CONFIG_KASAN_STACK */ -/* - * Clear all poison for the region between the current SP and a provided - * watermark value, as is sometimes required prior to hand-crafted asm function - * returns in the middle of functions. - */ -void kasan_unpoison_stack_above_sp_to(const void *watermark) -{ - const void *sp = __builtin_frame_address(0); - size_t size = watermark - sp; - - if (WARN_ON(sp > watermark)) - return; - kasan_unpoison_shadow(sp, size); -} - -void kasan_alloc_pages(struct page *page, unsigned int order) +bool __kasan_unpoison_pages(struct page *page, unsigned int order, bool init) { u8 tag; unsigned long i; if (unlikely(PageHighMem(page))) - return; + return false; + + if (!kasan_sample_page_alloc(order)) + return false; - tag = random_tag(); + tag = kasan_random_tag(); + kasan_unpoison(set_tag(page_address(page), tag), + PAGE_SIZE << order, init); for (i = 0; i < (1 << order); i++) page_kasan_tag_set(page + i, tag); - kasan_unpoison_shadow(page_address(page), PAGE_SIZE << order); -} -void kasan_free_pages(struct page *page, unsigned int order) -{ - if (likely(!PageHighMem(page))) - kasan_poison_shadow(page_address(page), - PAGE_SIZE << order, - KASAN_FREE_PAGE); -} - -/* - * Adaptive redzone policy taken from the userspace AddressSanitizer runtime. - * For larger allocations larger redzones are used. - */ -static inline unsigned int optimal_redzone(unsigned int object_size) -{ - if (IS_ENABLED(CONFIG_KASAN_SW_TAGS)) - return 0; - - return - object_size <= 64 - 16 ? 16 : - object_size <= 128 - 32 ? 32 : - object_size <= 512 - 64 ? 64 : - object_size <= 4096 - 128 ? 128 : - object_size <= (1 << 14) - 256 ? 256 : - object_size <= (1 << 15) - 512 ? 512 : - object_size <= (1 << 16) - 1024 ? 1024 : 2048; -} - -void kasan_cache_create(struct kmem_cache *cache, unsigned int *size, - slab_flags_t *flags) -{ - unsigned int orig_size = *size; - unsigned int redzone_size; - int redzone_adjust; - - /* Add alloc meta. */ - cache->kasan_info.alloc_meta_offset = *size; - *size += sizeof(struct kasan_alloc_meta); - - /* Add free meta. */ - if (IS_ENABLED(CONFIG_KASAN_GENERIC) && - (cache->flags & SLAB_TYPESAFE_BY_RCU || cache->ctor || - cache->object_size < sizeof(struct kasan_free_meta))) { - cache->kasan_info.free_meta_offset = *size; - *size += sizeof(struct kasan_free_meta); - } - - redzone_size = optimal_redzone(cache->object_size); - redzone_adjust = redzone_size - (*size - cache->object_size); - if (redzone_adjust > 0) - *size += redzone_adjust; - - *size = min_t(unsigned int, KMALLOC_MAX_SIZE, - max(*size, cache->object_size + redzone_size)); - - /* - * If the metadata doesn't fit, don't enable KASAN at all. - */ - if (*size <= cache->kasan_info.alloc_meta_offset || - *size <= cache->kasan_info.free_meta_offset) { - cache->kasan_info.alloc_meta_offset = 0; - cache->kasan_info.free_meta_offset = 0; - *size = orig_size; - return; - } - - *flags |= SLAB_KASAN; -} - -size_t kasan_metadata_size(struct kmem_cache *cache) -{ - return (cache->kasan_info.alloc_meta_offset ? - sizeof(struct kasan_alloc_meta) : 0) + - (cache->kasan_info.free_meta_offset ? - sizeof(struct kasan_free_meta) : 0); + return true; } -struct kasan_alloc_meta *get_alloc_info(struct kmem_cache *cache, - const void *object) +void __kasan_poison_pages(struct page *page, unsigned int order, bool init) { - return (void *)object + cache->kasan_info.alloc_meta_offset; -} - -struct kasan_free_meta *get_free_info(struct kmem_cache *cache, - const void *object) -{ - BUILD_BUG_ON(sizeof(struct kasan_free_meta) > 32); - return (void *)object + cache->kasan_info.free_meta_offset; -} - - -static void kasan_set_free_info(struct kmem_cache *cache, - void *object, u8 tag) -{ - struct kasan_alloc_meta *alloc_meta; - u8 idx = 0; - - alloc_meta = get_alloc_info(cache, object); - -#ifdef CONFIG_KASAN_SW_TAGS_IDENTIFY - idx = alloc_meta->free_track_idx; - alloc_meta->free_pointer_tag[idx] = tag; - alloc_meta->free_track_idx = (idx + 1) % KASAN_NR_FREE_STACKS; -#endif - - set_track(&alloc_meta->free_track[idx], GFP_NOWAIT); + if (likely(!PageHighMem(page))) + kasan_poison(page_address(page), PAGE_SIZE << order, + KASAN_PAGE_FREE, init); } -void kasan_poison_slab(struct page *page) +void __kasan_poison_slab(struct slab *slab) { + struct page *page = slab_page(slab); unsigned long i; for (i = 0; i < compound_nr(page); i++) page_kasan_tag_reset(page + i); - kasan_poison_shadow(page_address(page), page_size(page), - KASAN_KMALLOC_REDZONE); + kasan_poison(page_address(page), page_size(page), + KASAN_SLAB_REDZONE, false); } -void kasan_unpoison_object_data(struct kmem_cache *cache, void *object) +void __kasan_unpoison_new_object(struct kmem_cache *cache, void *object) { - kasan_unpoison_shadow(object, cache->object_size); + kasan_unpoison(object, cache->object_size, false); } -void kasan_poison_object_data(struct kmem_cache *cache, void *object) +void __kasan_poison_new_object(struct kmem_cache *cache, void *object) { - kasan_poison_shadow(object, - round_up(cache->object_size, KASAN_SHADOW_SCALE_SIZE), - KASAN_KMALLOC_REDZONE); + kasan_poison(object, round_up(cache->object_size, KASAN_GRANULE_SIZE), + KASAN_SLAB_REDZONE, false); } /* @@ -347,618 +182,396 @@ void kasan_poison_object_data(struct kmem_cache *cache, void *object) * 2. A cache might be SLAB_TYPESAFE_BY_RCU, which means objects can be * accessed after being freed. We preassign tags for objects in these * caches as well. - * 3. For SLAB allocator we can't preassign tags randomly since the freelist - * is stored as an array of indexes instead of a linked list. Assign tags - * based on objects indexes, so that objects that are next to each other - * get different tags. */ -static u8 assign_tag(struct kmem_cache *cache, const void *object, - bool init, bool keep_tag) +static inline u8 assign_tag(struct kmem_cache *cache, + const void *object, bool init) { - /* - * 1. When an object is kmalloc()'ed, two hooks are called: - * kasan_slab_alloc() and kasan_kmalloc(). We assign the - * tag only in the first one. - * 2. We reuse the same tag for krealloc'ed objects. - */ - if (keep_tag) - return get_tag(object); + if (IS_ENABLED(CONFIG_KASAN_GENERIC)) + return 0xff; /* * If the cache neither has a constructor nor has SLAB_TYPESAFE_BY_RCU * set, assign a tag when the object is being allocated (init == false). */ if (!cache->ctor && !(cache->flags & SLAB_TYPESAFE_BY_RCU)) - return init ? KASAN_TAG_KERNEL : random_tag(); + return init ? KASAN_TAG_KERNEL : kasan_random_tag(); - /* For caches that either have a constructor or SLAB_TYPESAFE_BY_RCU: */ -#ifdef CONFIG_SLAB - /* For SLAB assign tags based on the object index in the freelist. */ - return (u8)obj_to_index(cache, virt_to_page(object), (void *)object); -#else /* - * For SLUB assign a random tag during slab creation, otherwise reuse + * For caches that either have a constructor or SLAB_TYPESAFE_BY_RCU, + * assign a random tag during slab creation, otherwise reuse * the already assigned tag. */ - return init ? random_tag() : get_tag(object); -#endif + return init ? kasan_random_tag() : get_tag(object); } -void * __must_check kasan_init_slab_obj(struct kmem_cache *cache, +void * __must_check __kasan_init_slab_obj(struct kmem_cache *cache, const void *object) { - struct kasan_alloc_meta *alloc_info; + /* Initialize per-object metadata if it is present. */ + if (kasan_requires_meta()) + kasan_init_object_meta(cache, object); - if (!(cache->flags & SLAB_KASAN)) - return (void *)object; - - alloc_info = get_alloc_info(cache, object); - __memset(alloc_info, 0, sizeof(*alloc_info)); - - if (IS_ENABLED(CONFIG_KASAN_SW_TAGS)) - object = set_tag(object, - assign_tag(cache, object, true, false)); + /* Tag is ignored in set_tag() without CONFIG_KASAN_SW/HW_TAGS */ + object = set_tag(object, assign_tag(cache, object, true)); return (void *)object; } -static inline bool shadow_invalid(u8 tag, s8 shadow_byte) +/* Returns true when freeing the object is not safe. */ +static bool check_slab_allocation(struct kmem_cache *cache, void *object, + unsigned long ip) { - if (IS_ENABLED(CONFIG_KASAN_GENERIC)) - return shadow_byte < 0 || - shadow_byte >= KASAN_SHADOW_SCALE_SIZE; + void *tagged_object = object; - /* else CONFIG_KASAN_SW_TAGS: */ - if ((u8)shadow_byte == KASAN_TAG_INVALID) + object = kasan_reset_tag(object); + + if (unlikely(nearest_obj(cache, virt_to_slab(object), object) != object)) { + kasan_report_invalid_free(tagged_object, ip, KASAN_REPORT_INVALID_FREE); return true; - if ((tag != KASAN_TAG_KERNEL) && (tag != (u8)shadow_byte)) + } + + if (!kasan_byte_accessible(tagged_object)) { + kasan_report_invalid_free(tagged_object, ip, KASAN_REPORT_DOUBLE_FREE); return true; + } return false; } -static bool __kasan_slab_free(struct kmem_cache *cache, void *object, - unsigned long ip, bool quarantine) +static inline void poison_slab_object(struct kmem_cache *cache, void *object, + bool init) { - s8 shadow_byte; - u8 tag; - void *tagged_object; - unsigned long rounded_up_size; + void *tagged_object = object; - tag = get_tag(object); - tagged_object = object; - object = reset_tag(object); + object = kasan_reset_tag(object); - if (unlikely(nearest_obj(cache, virt_to_head_page(object), object) != - object)) { - kasan_report_invalid_free(tagged_object, ip); - return true; - } + kasan_poison(object, round_up(cache->object_size, KASAN_GRANULE_SIZE), + KASAN_SLAB_FREE, init); + + if (kasan_stack_collection_enabled()) + kasan_save_free_info(cache, tagged_object); +} - /* RCU slabs could be legally used after free within the RCU period */ - if (unlikely(cache->flags & SLAB_TYPESAFE_BY_RCU)) +bool __kasan_slab_pre_free(struct kmem_cache *cache, void *object, + unsigned long ip) +{ + if (is_kfence_address(object)) return false; + return check_slab_allocation(cache, object, ip); +} - shadow_byte = READ_ONCE(*(s8 *)kasan_mem_to_shadow(object)); - if (shadow_invalid(tag, shadow_byte)) { - kasan_report_invalid_free(tagged_object, ip); - return true; - } +bool __kasan_slab_free(struct kmem_cache *cache, void *object, bool init, + bool still_accessible, bool no_quarantine) +{ + if (is_kfence_address(object)) + return false; - rounded_up_size = round_up(cache->object_size, KASAN_SHADOW_SCALE_SIZE); - kasan_poison_shadow(object, rounded_up_size, KASAN_KMALLOC_FREE); + /* + * If this point is reached with an object that must still be + * accessible under RCU, we can't poison it; in that case, also skip the + * quarantine. This should mostly only happen when CONFIG_SLUB_RCU_DEBUG + * has been disabled manually. + * + * Putting the object on the quarantine wouldn't help catch UAFs (since + * we can't poison it here), and it would mask bugs caused by + * SLAB_TYPESAFE_BY_RCU users not being careful enough about object + * reuse; so overall, putting the object into the quarantine here would + * be counterproductive. + */ + if (still_accessible) + return false; + + poison_slab_object(cache, object, init); - if ((IS_ENABLED(CONFIG_KASAN_GENERIC) && !quarantine) || - unlikely(!(cache->flags & SLAB_KASAN))) + if (no_quarantine) return false; - kasan_set_free_info(cache, object, tag); + /* + * If the object is put into quarantine, do not let slab put the object + * onto the freelist for now. The object's metadata is kept until the + * object gets evicted from quarantine. + */ + if (kasan_quarantine_put(cache, object)) + return true; + + /* + * Note: Keep per-object metadata to allow KASAN print stack traces for + * use-after-free-before-realloc bugs. + */ + + /* Let slab put the object onto the freelist. */ + return false; +} + +static inline bool check_page_allocation(void *ptr, unsigned long ip) +{ + if (ptr != page_address(virt_to_head_page(ptr))) { + kasan_report_invalid_free(ptr, ip, KASAN_REPORT_INVALID_FREE); + return true; + } - quarantine_put(get_free_info(cache, object), cache); + if (!kasan_byte_accessible(ptr)) { + kasan_report_invalid_free(ptr, ip, KASAN_REPORT_DOUBLE_FREE); + return true; + } - return IS_ENABLED(CONFIG_KASAN_GENERIC); + return false; } -bool kasan_slab_free(struct kmem_cache *cache, void *object, unsigned long ip) +void __kasan_kfree_large(void *ptr, unsigned long ip) { - return __kasan_slab_free(cache, object, ip, true); + check_page_allocation(ptr, ip); + + /* The object will be poisoned by kasan_poison_pages(). */ } -static void *__kasan_kmalloc(struct kmem_cache *cache, const void *object, - size_t size, gfp_t flags, bool keep_tag) +static inline void unpoison_slab_object(struct kmem_cache *cache, void *object, + gfp_t flags, bool init) { - unsigned long redzone_start; - unsigned long redzone_end; - u8 tag = 0xff; + /* + * Unpoison the whole object. For kmalloc() allocations, + * poison_kmalloc_redzone() will do precise poisoning. + */ + kasan_unpoison(object, cache->object_size, init); + + /* Save alloc info (if possible) for non-kmalloc() allocations. */ + if (kasan_stack_collection_enabled() && !is_kmalloc_cache(cache)) + kasan_save_alloc_info(cache, object, flags); +} + +void * __must_check __kasan_slab_alloc(struct kmem_cache *cache, + void *object, gfp_t flags, bool init) +{ + u8 tag; + void *tagged_object; if (gfpflags_allow_blocking(flags)) - quarantine_reduce(); + kasan_quarantine_reduce(); if (unlikely(object == NULL)) return NULL; - redzone_start = round_up((unsigned long)(object + size), - KASAN_SHADOW_SCALE_SIZE); - redzone_end = round_up((unsigned long)object + cache->object_size, - KASAN_SHADOW_SCALE_SIZE); - - if (IS_ENABLED(CONFIG_KASAN_SW_TAGS)) - tag = assign_tag(cache, object, false, keep_tag); + if (is_kfence_address(object)) + return (void *)object; - /* Tag is ignored in set_tag without CONFIG_KASAN_SW_TAGS */ - kasan_unpoison_shadow(set_tag(object, tag), size); - kasan_poison_shadow((void *)redzone_start, redzone_end - redzone_start, - KASAN_KMALLOC_REDZONE); + /* + * Generate and assign random tag for tag-based modes. + * Tag is ignored in set_tag() for the generic mode. + */ + tag = assign_tag(cache, object, false); + tagged_object = set_tag(object, tag); - if (cache->flags & SLAB_KASAN) - set_track(&get_alloc_info(cache, object)->alloc_track, flags); + /* Unpoison the object and save alloc info for non-kmalloc() allocations. */ + unpoison_slab_object(cache, tagged_object, flags, init); - return set_tag(object, tag); + return tagged_object; } -void * __must_check kasan_slab_alloc(struct kmem_cache *cache, void *object, - gfp_t flags) +static inline void poison_kmalloc_redzone(struct kmem_cache *cache, + const void *object, size_t size, gfp_t flags) { - return __kasan_kmalloc(cache, object, cache->object_size, flags, false); + unsigned long redzone_start; + unsigned long redzone_end; + + /* + * The redzone has byte-level precision for the generic mode. + * Partially poison the last object granule to cover the unaligned + * part of the redzone. + */ + if (IS_ENABLED(CONFIG_KASAN_GENERIC)) + kasan_poison_last_granule((void *)object, size); + + /* Poison the aligned part of the redzone. */ + redzone_start = round_up((unsigned long)(object + size), + KASAN_GRANULE_SIZE); + redzone_end = round_up((unsigned long)(object + cache->object_size), + KASAN_GRANULE_SIZE); + kasan_poison((void *)redzone_start, redzone_end - redzone_start, + KASAN_SLAB_REDZONE, false); + + /* + * Save alloc info (if possible) for kmalloc() allocations. + * This also rewrites the alloc info when called from kasan_krealloc(). + */ + if (kasan_stack_collection_enabled() && is_kmalloc_cache(cache)) + kasan_save_alloc_info(cache, (void *)object, flags); + } -void * __must_check kasan_kmalloc(struct kmem_cache *cache, const void *object, - size_t size, gfp_t flags) +void * __must_check __kasan_kmalloc(struct kmem_cache *cache, const void *object, + size_t size, gfp_t flags) { - return __kasan_kmalloc(cache, object, size, flags, true); + if (gfpflags_allow_blocking(flags)) + kasan_quarantine_reduce(); + + if (unlikely(object == NULL)) + return NULL; + + if (is_kfence_address(object)) + return (void *)object; + + /* The object has already been unpoisoned by kasan_slab_alloc(). */ + poison_kmalloc_redzone(cache, object, size, flags); + + /* Keep the tag that was set by kasan_slab_alloc(). */ + return (void *)object; } -EXPORT_SYMBOL(kasan_kmalloc); +EXPORT_SYMBOL(__kasan_kmalloc); -void * __must_check kasan_kmalloc_large(const void *ptr, size_t size, +static inline void poison_kmalloc_large_redzone(const void *ptr, size_t size, gfp_t flags) { - struct page *page; unsigned long redzone_start; unsigned long redzone_end; + /* + * The redzone has byte-level precision for the generic mode. + * Partially poison the last object granule to cover the unaligned + * part of the redzone. + */ + if (IS_ENABLED(CONFIG_KASAN_GENERIC)) + kasan_poison_last_granule(ptr, size); + + /* Poison the aligned part of the redzone. */ + redzone_start = round_up((unsigned long)(ptr + size), KASAN_GRANULE_SIZE); + redzone_end = (unsigned long)ptr + page_size(virt_to_page(ptr)); + kasan_poison((void *)redzone_start, redzone_end - redzone_start, + KASAN_PAGE_REDZONE, false); +} + +void * __must_check __kasan_kmalloc_large(const void *ptr, size_t size, + gfp_t flags) +{ if (gfpflags_allow_blocking(flags)) - quarantine_reduce(); + kasan_quarantine_reduce(); if (unlikely(ptr == NULL)) return NULL; - page = virt_to_page(ptr); - redzone_start = round_up((unsigned long)(ptr + size), - KASAN_SHADOW_SCALE_SIZE); - redzone_end = (unsigned long)ptr + page_size(page); - - kasan_unpoison_shadow(ptr, size); - kasan_poison_shadow((void *)redzone_start, redzone_end - redzone_start, - KASAN_PAGE_REDZONE); + /* The object has already been unpoisoned by kasan_unpoison_pages(). */ + poison_kmalloc_large_redzone(ptr, size, flags); + /* Keep the tag that was set by alloc_pages(). */ return (void *)ptr; } -void * __must_check kasan_krealloc(const void *object, size_t size, gfp_t flags) +void * __must_check __kasan_krealloc(const void *object, size_t size, gfp_t flags) { - struct page *page; + struct slab *slab; + + if (gfpflags_allow_blocking(flags)) + kasan_quarantine_reduce(); if (unlikely(object == ZERO_SIZE_PTR)) return (void *)object; - page = virt_to_head_page(object); + if (is_kfence_address(object)) + return (void *)object; - if (unlikely(!PageSlab(page))) - return kasan_kmalloc_large(object, size, flags); - else - return __kasan_kmalloc(page->slab_cache, object, size, - flags, true); -} + /* + * Unpoison the object's data. + * Part of it might already have been unpoisoned, but it's unknown + * how big that part is. + */ + kasan_unpoison(object, size, false); -void kasan_poison_kfree(void *ptr, unsigned long ip) -{ - struct page *page; + slab = virt_to_slab(object); - page = virt_to_head_page(ptr); + /* Piggy-back on kmalloc() instrumentation to poison the redzone. */ + if (unlikely(!slab)) + poison_kmalloc_large_redzone(object, size, flags); + else + poison_kmalloc_redzone(slab->slab_cache, object, size, flags); - if (unlikely(!PageSlab(page))) { - if (ptr != page_address(page)) { - kasan_report_invalid_free(ptr, ip); - return; - } - kasan_poison_shadow(ptr, page_size(page), KASAN_FREE_PAGE); - } else { - __kasan_slab_free(page->slab_cache, ptr, ip, false); - } + return (void *)object; } -void kasan_kfree_large(void *ptr, unsigned long ip) +bool __kasan_mempool_poison_pages(struct page *page, unsigned int order, + unsigned long ip) { - if (ptr != page_address(virt_to_head_page(ptr))) - kasan_report_invalid_free(ptr, ip); - /* The object will be poisoned by page_alloc. */ -} + unsigned long *ptr; -#ifndef CONFIG_KASAN_VMALLOC -int kasan_module_alloc(void *addr, size_t size) -{ - void *ret; - size_t scaled_size; - size_t shadow_size; - unsigned long shadow_start; + if (unlikely(PageHighMem(page))) + return true; - shadow_start = (unsigned long)kasan_mem_to_shadow(addr); - scaled_size = (size + KASAN_SHADOW_MASK) >> KASAN_SHADOW_SCALE_SHIFT; - shadow_size = round_up(scaled_size, PAGE_SIZE); + /* Bail out if allocation was excluded due to sampling. */ + if (!IS_ENABLED(CONFIG_KASAN_GENERIC) && + page_kasan_tag(page) == KASAN_TAG_KERNEL) + return true; - if (WARN_ON(!PAGE_ALIGNED(shadow_start))) - return -EINVAL; + ptr = page_address(page); - ret = __vmalloc_node_range(shadow_size, 1, shadow_start, - shadow_start + shadow_size, - GFP_KERNEL, - PAGE_KERNEL, VM_NO_GUARD, NUMA_NO_NODE, - __builtin_return_address(0)); + if (check_page_allocation(ptr, ip)) + return false; - if (ret) { - __memset(ret, KASAN_SHADOW_INIT, shadow_size); - find_vm_area(addr)->flags |= VM_KASAN; - kmemleak_ignore(ret); - return 0; - } + kasan_poison(ptr, PAGE_SIZE << order, KASAN_PAGE_FREE, false); - return -ENOMEM; + return true; } -void kasan_free_shadow(const struct vm_struct *vm) +void __kasan_mempool_unpoison_pages(struct page *page, unsigned int order, + unsigned long ip) { - if (vm->flags & VM_KASAN) - vfree(kasan_mem_to_shadow(vm->addr)); + __kasan_unpoison_pages(page, order, false); } -#endif -#ifdef CONFIG_MEMORY_HOTPLUG -static bool shadow_mapped(unsigned long addr) +bool __kasan_mempool_poison_object(void *ptr, unsigned long ip) { - pgd_t *pgd = pgd_offset_k(addr); - p4d_t *p4d; - pud_t *pud; - pmd_t *pmd; - pte_t *pte; - - if (pgd_none(*pgd)) - return false; - p4d = p4d_offset(pgd, addr); - if (p4d_none(*p4d)) - return false; - pud = pud_offset(p4d, addr); - if (pud_none(*pud)) - return false; - - /* - * We can't use pud_large() or pud_huge(), the first one is - * arch-specific, the last one depends on HUGETLB_PAGE. So let's abuse - * pud_bad(), if pud is bad then it's bad because it's huge. - */ - if (pud_bad(*pud)) - return true; - pmd = pmd_offset(pud, addr); - if (pmd_none(*pmd)) - return false; + struct page *page = virt_to_page(ptr); + struct slab *slab; - if (pmd_bad(*pmd)) + if (unlikely(PageLargeKmalloc(page))) { + if (check_page_allocation(ptr, ip)) + return false; + kasan_poison(ptr, page_size(page), KASAN_PAGE_FREE, false); return true; - pte = pte_offset_kernel(pmd, addr); - return !pte_none(*pte); -} - -static int __meminit kasan_mem_notifier(struct notifier_block *nb, - unsigned long action, void *data) -{ - struct memory_notify *mem_data = data; - unsigned long nr_shadow_pages, start_kaddr, shadow_start; - unsigned long shadow_end, shadow_size; - - nr_shadow_pages = mem_data->nr_pages >> KASAN_SHADOW_SCALE_SHIFT; - start_kaddr = (unsigned long)pfn_to_kaddr(mem_data->start_pfn); - shadow_start = (unsigned long)kasan_mem_to_shadow((void *)start_kaddr); - shadow_size = nr_shadow_pages << PAGE_SHIFT; - shadow_end = shadow_start + shadow_size; - - if (WARN_ON(mem_data->nr_pages % KASAN_SHADOW_SCALE_SIZE) || - WARN_ON(start_kaddr % (KASAN_SHADOW_SCALE_SIZE << PAGE_SHIFT))) - return NOTIFY_BAD; - - switch (action) { - case MEM_GOING_ONLINE: { - void *ret; - - /* - * If shadow is mapped already than it must have been mapped - * during the boot. This could happen if we onlining previously - * offlined memory. - */ - if (shadow_mapped(shadow_start)) - return NOTIFY_OK; - - ret = __vmalloc_node_range(shadow_size, PAGE_SIZE, shadow_start, - shadow_end, GFP_KERNEL, - PAGE_KERNEL, VM_NO_GUARD, - pfn_to_nid(mem_data->start_pfn), - __builtin_return_address(0)); - if (!ret) - return NOTIFY_BAD; - - kmemleak_ignore(ret); - return NOTIFY_OK; - } - case MEM_CANCEL_ONLINE: - case MEM_OFFLINE: { - struct vm_struct *vm; - - /* - * shadow_start was either mapped during boot by kasan_init() - * or during memory online by __vmalloc_node_range(). - * In the latter case we can use vfree() to free shadow. - * Non-NULL result of the find_vm_area() will tell us if - * that was the second case. - * - * Currently it's not possible to free shadow mapped - * during boot by kasan_init(). It's because the code - * to do that hasn't been written yet. So we'll just - * leak the memory. - */ - vm = find_vm_area((void *)shadow_start); - if (vm) - vfree((void *)shadow_start); - } } - return NOTIFY_OK; -} - -static int __init kasan_memhotplug_init(void) -{ - hotplug_memory_notifier(kasan_mem_notifier, 0); - - return 0; -} - -core_initcall(kasan_memhotplug_init); -#endif - -#ifdef CONFIG_KASAN_VMALLOC -static int kasan_populate_vmalloc_pte(pte_t *ptep, unsigned long addr, - void *unused) -{ - unsigned long page; - pte_t pte; - - if (likely(!pte_none(*ptep))) - return 0; + if (is_kfence_address(ptr)) + return true; - page = __get_free_page(GFP_KERNEL); - if (!page) - return -ENOMEM; + slab = page_slab(page); - memset((void *)page, KASAN_VMALLOC_INVALID, PAGE_SIZE); - pte = pfn_pte(PFN_DOWN(__pa(page)), PAGE_KERNEL); + if (check_slab_allocation(slab->slab_cache, ptr, ip)) + return false; - spin_lock(&init_mm.page_table_lock); - if (likely(pte_none(*ptep))) { - set_pte_at(&init_mm, addr, ptep, pte); - page = 0; - } - spin_unlock(&init_mm.page_table_lock); - if (page) - free_page(page); - return 0; + poison_slab_object(slab->slab_cache, ptr, false); + return true; } -int kasan_populate_vmalloc(unsigned long addr, unsigned long size) +void __kasan_mempool_unpoison_object(void *ptr, size_t size, unsigned long ip) { - unsigned long shadow_start, shadow_end; - int ret; - - if (!is_vmalloc_or_module_addr((void *)addr)) - return 0; - - shadow_start = (unsigned long)kasan_mem_to_shadow((void *)addr); - shadow_start = ALIGN_DOWN(shadow_start, PAGE_SIZE); - shadow_end = (unsigned long)kasan_mem_to_shadow((void *)addr + size); - shadow_end = ALIGN(shadow_end, PAGE_SIZE); + struct slab *slab; + gfp_t flags = 0; /* Might be executing under a lock. */ - ret = apply_to_page_range(&init_mm, shadow_start, - shadow_end - shadow_start, - kasan_populate_vmalloc_pte, NULL); - if (ret) - return ret; - - flush_cache_vmap(shadow_start, shadow_end); + slab = virt_to_slab(ptr); /* - * We need to be careful about inter-cpu effects here. Consider: - * - * CPU#0 CPU#1 - * WRITE_ONCE(p, vmalloc(100)); while (x = READ_ONCE(p)) ; - * p[99] = 1; - * - * With compiler instrumentation, that ends up looking like this: - * - * CPU#0 CPU#1 - * // vmalloc() allocates memory - * // let a = area->addr - * // we reach kasan_populate_vmalloc - * // and call kasan_unpoison_shadow: - * STORE shadow(a), unpoison_val - * ... - * STORE shadow(a+99), unpoison_val x = LOAD p - * // rest of vmalloc process <data dependency> - * STORE p, a LOAD shadow(x+99) - * - * If there is no barrier between the end of unpoisioning the shadow - * and the store of the result to p, the stores could be committed - * in a different order by CPU#0, and CPU#1 could erroneously observe - * poison in the shadow. - * - * We need some sort of barrier between the stores. - * - * In the vmalloc() case, this is provided by a smp_wmb() in - * clear_vm_uninitialized_flag(). In the per-cpu allocator and in - * get_vm_area() and friends, the caller gets shadow allocated but - * doesn't have any pages mapped into the virtual address space that - * has been reserved. Mapping those pages in will involve taking and - * releasing a page-table lock, which will provide the barrier. + * This function can be called for large kmalloc allocation that get + * their memory from page_alloc. */ - - return 0; -} - -/* - * Poison the shadow for a vmalloc region. Called as part of the - * freeing process at the time the region is freed. - */ -void kasan_poison_vmalloc(const void *start, unsigned long size) -{ - if (!is_vmalloc_or_module_addr(start)) + if (unlikely(!slab)) { + kasan_unpoison(ptr, size, false); + poison_kmalloc_large_redzone(ptr, size, flags); return; + } - size = round_up(size, KASAN_SHADOW_SCALE_SIZE); - kasan_poison_shadow(start, size, KASAN_VMALLOC_INVALID); -} - -void kasan_unpoison_vmalloc(const void *start, unsigned long size) -{ - if (!is_vmalloc_or_module_addr(start)) + if (is_kfence_address(ptr)) return; - kasan_unpoison_shadow(start, size); -} - -static int kasan_depopulate_vmalloc_pte(pte_t *ptep, unsigned long addr, - void *unused) -{ - unsigned long page; - - page = (unsigned long)__va(pte_pfn(*ptep) << PAGE_SHIFT); + /* Unpoison the object and save alloc info for non-kmalloc() allocations. */ + unpoison_slab_object(slab->slab_cache, ptr, flags, false); - spin_lock(&init_mm.page_table_lock); - - if (likely(!pte_none(*ptep))) { - pte_clear(&init_mm, addr, ptep); - free_page(page); - } - spin_unlock(&init_mm.page_table_lock); - - return 0; + /* Poison the redzone and save alloc info for kmalloc() allocations. */ + if (is_kmalloc_cache(slab->slab_cache)) + poison_kmalloc_redzone(slab->slab_cache, ptr, size, flags); } -/* - * Release the backing for the vmalloc region [start, end), which - * lies within the free region [free_region_start, free_region_end). - * - * This can be run lazily, long after the region was freed. It runs - * under vmap_area_lock, so it's not safe to interact with the vmalloc/vmap - * infrastructure. - * - * How does this work? - * ------------------- - * - * We have a region that is page aligned, labelled as A. - * That might not map onto the shadow in a way that is page-aligned: - * - * start end - * v v - * |????????|????????|AAAAAAAA|AA....AA|AAAAAAAA|????????| < vmalloc - * -------- -------- -------- -------- -------- - * | | | | | - * | | | /-------/ | - * \-------\|/------/ |/---------------/ - * ||| || - * |??AAAAAA|AAAAAAAA|AA??????| < shadow - * (1) (2) (3) - * - * First we align the start upwards and the end downwards, so that the - * shadow of the region aligns with shadow page boundaries. In the - * example, this gives us the shadow page (2). This is the shadow entirely - * covered by this allocation. - * - * Then we have the tricky bits. We want to know if we can free the - * partially covered shadow pages - (1) and (3) in the example. For this, - * we are given the start and end of the free region that contains this - * allocation. Extending our previous example, we could have: - * - * free_region_start free_region_end - * | start end | - * v v v v - * |FFFFFFFF|FFFFFFFF|AAAAAAAA|AA....AA|AAAAAAAA|FFFFFFFF| < vmalloc - * -------- -------- -------- -------- -------- - * | | | | | - * | | | /-------/ | - * \-------\|/------/ |/---------------/ - * ||| || - * |FFAAAAAA|AAAAAAAA|AAF?????| < shadow - * (1) (2) (3) - * - * Once again, we align the start of the free region up, and the end of - * the free region down so that the shadow is page aligned. So we can free - * page (1) - we know no allocation currently uses anything in that page, - * because all of it is in the vmalloc free region. But we cannot free - * page (3), because we can't be sure that the rest of it is unused. - * - * We only consider pages that contain part of the original region for - * freeing: we don't try to free other pages from the free region or we'd - * end up trying to free huge chunks of virtual address space. - * - * Concurrency - * ----------- - * - * How do we know that we're not freeing a page that is simultaneously - * being used for a fresh allocation in kasan_populate_vmalloc(_pte)? - * - * We _can_ have kasan_release_vmalloc and kasan_populate_vmalloc running - * at the same time. While we run under free_vmap_area_lock, the population - * code does not. - * - * free_vmap_area_lock instead operates to ensure that the larger range - * [free_region_start, free_region_end) is safe: because __alloc_vmap_area and - * the per-cpu region-finding algorithm both run under free_vmap_area_lock, - * no space identified as free will become used while we are running. This - * means that so long as we are careful with alignment and only free shadow - * pages entirely covered by the free region, we will not run in to any - * trouble - any simultaneous allocations will be for disjoint regions. - */ -void kasan_release_vmalloc(unsigned long start, unsigned long end, - unsigned long free_region_start, - unsigned long free_region_end) -{ - void *shadow_start, *shadow_end; - unsigned long region_start, region_end; - unsigned long size; - - region_start = ALIGN(start, PAGE_SIZE * KASAN_SHADOW_SCALE_SIZE); - region_end = ALIGN_DOWN(end, PAGE_SIZE * KASAN_SHADOW_SCALE_SIZE); - - free_region_start = ALIGN(free_region_start, - PAGE_SIZE * KASAN_SHADOW_SCALE_SIZE); - - if (start != region_start && - free_region_start < region_start) - region_start -= PAGE_SIZE * KASAN_SHADOW_SCALE_SIZE; - - free_region_end = ALIGN_DOWN(free_region_end, - PAGE_SIZE * KASAN_SHADOW_SCALE_SIZE); - - if (end != region_end && - free_region_end > region_end) - region_end += PAGE_SIZE * KASAN_SHADOW_SCALE_SIZE; - - shadow_start = kasan_mem_to_shadow((void *)region_start); - shadow_end = kasan_mem_to_shadow((void *)region_end); - - if (shadow_end > shadow_start) { - size = shadow_end - shadow_start; - apply_to_existing_page_range(&init_mm, - (unsigned long)shadow_start, - size, kasan_depopulate_vmalloc_pte, - NULL); - flush_tlb_kernel_range((unsigned long)shadow_start, - (unsigned long)shadow_end); +bool __kasan_check_byte(const void *address, unsigned long ip) +{ + if (!kasan_byte_accessible(address)) { + kasan_report(address, 1, false, ip); + return false; } + return true; } -#endif |