kasan: init memory in kasan_(un)poison for HW_TAGS

This change adds an argument to kasan_poison() and kasan_unpoison() that
allows initializing memory along with setting the tags for HW_TAGS.

Combining setting allocation tags with memory initialization will improve
HW_TAGS KASAN performance when init_on_alloc/free is enabled.

This change doesn't integrate memory initialization with KASAN, this is
done is subsequent patches in this series.

Link: https://lkml.kernel.org/r/3054314039fa64510947e674180d675cab1b4c41.1615296150.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Branislav Rankov <Branislav.Rankov@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Kevin Brodsky <kevin.brodsky@arm.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Peter Collingbourne <pcc@google.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Will Deacon <will.deacon@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/lib/test_kasan.c b/lib/test_kasan.c
index 785e724..0882d6c 100644 (file)
--- a/lib/test_kasan.c
+++ b/lib/test_kasan.c
@@ -1049,14 +1049,14 @@ static void match_all_mem_tag(struct kunit *test)
                        continue;
 
                /* Mark the first memory granule with the chosen memory tag. */
-               kasan_poison(ptr, KASAN_GRANULE_SIZE, (u8)tag);
+               kasan_poison(ptr, KASAN_GRANULE_SIZE, (u8)tag, false);
 
                /* This access must cause a KASAN report. */
                KUNIT_EXPECT_KASAN_FAIL(test, *ptr = 0);
        }
 
        /* Recover the memory tag and free. */
-       kasan_poison(ptr, KASAN_GRANULE_SIZE, get_tag(ptr));
+       kasan_poison(ptr, KASAN_GRANULE_SIZE, get_tag(ptr), false);
        kfree(ptr);
 }
 

diff --git a/mm/kasan/common.c b/mm/kasan/common.c
index 7b53291..b3d8eb1 100644 (file)
--- a/mm/kasan/common.c
+++ b/mm/kasan/common.c
@@ -60,7 +60,7 @@ void kasan_disable_current(void)
 
 void __kasan_unpoison_range(const void *address, size_t size)
 {
-       kasan_unpoison(address, size);
+       kasan_unpoison(address, size, false);
 }
 
 #ifdef CONFIG_KASAN_STACK
@@ -69,7 +69,7 @@ void kasan_unpoison_task_stack(struct task_struct *task)
 {
        void *base = task_stack_page(task);
 
-       kasan_unpoison(base, THREAD_SIZE);
+       kasan_unpoison(base, THREAD_SIZE, false);
 }
 
 /* Unpoison the stack for the current task beyond a watermark sp value. */
@@ -82,7 +82,7 @@ asmlinkage void kasan_unpoison_task_stack_below(const void *watermark)
         */
        void *base = (void *)((unsigned long)watermark & ~(THREAD_SIZE - 1));
 
-       kasan_unpoison(base, watermark - base);
+       kasan_unpoison(base, watermark - base, false);
 }
 #endif /* CONFIG_KASAN_STACK */
 
@@ -108,14 +108,14 @@ void __kasan_alloc_pages(struct page *page, unsigned int order)
        tag = kasan_random_tag();
        for (i = 0; i < (1 << order); i++)
                page_kasan_tag_set(page + i, tag);
-       kasan_unpoison(page_address(page), PAGE_SIZE << order);
+       kasan_unpoison(page_address(page), PAGE_SIZE << order, false);
 }
 
 void __kasan_free_pages(struct page *page, unsigned int order)
 {
        if (likely(!PageHighMem(page)))
                kasan_poison(page_address(page), PAGE_SIZE << order,
-                            KASAN_FREE_PAGE);
+                            KASAN_FREE_PAGE, false);
 }
 
 /*
@@ -251,18 +251,18 @@ void __kasan_poison_slab(struct page *page)
        for (i = 0; i < compound_nr(page); i++)
                page_kasan_tag_reset(page + i);
        kasan_poison(page_address(page), page_size(page),
-                    KASAN_KMALLOC_REDZONE);
+                    KASAN_KMALLOC_REDZONE, false);
 }
 
 void __kasan_unpoison_object_data(struct kmem_cache *cache, void *object)
 {
-       kasan_unpoison(object, cache->object_size);
+       kasan_unpoison(object, cache->object_size, false);
 }
 
 void __kasan_poison_object_data(struct kmem_cache *cache, void *object)
 {
        kasan_poison(object, round_up(cache->object_size, KASAN_GRANULE_SIZE),
-                       KASAN_KMALLOC_REDZONE);
+                       KASAN_KMALLOC_REDZONE, false);
 }
 
 /*
@@ -351,7 +351,7 @@ static inline bool ____kasan_slab_free(struct kmem_cache *cache,
        }
 
        kasan_poison(object, round_up(cache->object_size, KASAN_GRANULE_SIZE),
-                       KASAN_KMALLOC_FREE);
+                       KASAN_KMALLOC_FREE, false);
 
        if ((IS_ENABLED(CONFIG_KASAN_GENERIC) && !quarantine))
                return false;
@@ -407,7 +407,7 @@ void __kasan_slab_free_mempool(void *ptr, unsigned long ip)
        if (unlikely(!PageSlab(page))) {
                if (____kasan_kfree_large(ptr, ip))
                        return;
-               kasan_poison(ptr, page_size(page), KASAN_FREE_PAGE);
+               kasan_poison(ptr, page_size(page), KASAN_FREE_PAGE, false);
        } else {
                ____kasan_slab_free(page->slab_cache, ptr, ip, false);
        }
@@ -453,7 +453,7 @@ void * __must_check __kasan_slab_alloc(struct kmem_cache *cache,
         * Unpoison the whole object.
         * For kmalloc() allocations, kasan_kmalloc() will do precise poisoning.
         */
-       kasan_unpoison(tagged_object, cache->object_size);
+       kasan_unpoison(tagged_object, cache->object_size, false);
 
        /* Save alloc info (if possible) for non-kmalloc() allocations. */
        if (kasan_stack_collection_enabled())
@@ -496,7 +496,7 @@ static inline void *____kasan_kmalloc(struct kmem_cache *cache,
        redzone_end = round_up((unsigned long)(object + cache->object_size),
                                KASAN_GRANULE_SIZE);
        kasan_poison((void *)redzone_start, redzone_end - redzone_start,
-                          KASAN_KMALLOC_REDZONE);
+                          KASAN_KMALLOC_REDZONE, false);
 
        /*
         * Save alloc info (if possible) for kmalloc() allocations.
@@ -546,7 +546,7 @@ void * __must_check __kasan_kmalloc_large(const void *ptr, size_t 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);
+                    KASAN_PAGE_REDZONE, false);
 
        return (void *)ptr;
 }
@@ -563,7 +563,7 @@ void * __must_check __kasan_krealloc(const void *object, size_t size, gfp_t flag
         * Part of it might already have been unpoisoned, but it's unknown
         * how big that part is.
         */
-       kasan_unpoison(object, size);
+       kasan_unpoison(object, size, false);
 
        page = virt_to_head_page(object);
 

diff --git a/mm/kasan/generic.c b/mm/kasan/generic.c
index 2e55e0f..53cbf28 100644 (file)
--- a/mm/kasan/generic.c
+++ b/mm/kasan/generic.c
@@ -208,11 +208,11 @@ static void register_global(struct kasan_global *global)
 {
        size_t aligned_size = round_up(global->size, KASAN_GRANULE_SIZE);
 
-       kasan_unpoison(global->beg, global->size);
+       kasan_unpoison(global->beg, global->size, false);
 
        kasan_poison(global->beg + aligned_size,
                     global->size_with_redzone - aligned_size,
-                    KASAN_GLOBAL_REDZONE);
+                    KASAN_GLOBAL_REDZONE, false);
 }
 
 void __asan_register_globals(struct kasan_global *globals, size_t size)
@@ -292,11 +292,11 @@ void __asan_alloca_poison(unsigned long addr, size_t size)
        WARN_ON(!IS_ALIGNED(addr, KASAN_ALLOCA_REDZONE_SIZE));
 
        kasan_unpoison((const void *)(addr + rounded_down_size),
-                       size - rounded_down_size);
+                       size - rounded_down_size, false);
        kasan_poison(left_redzone, KASAN_ALLOCA_REDZONE_SIZE,
-                    KASAN_ALLOCA_LEFT);
+                    KASAN_ALLOCA_LEFT, false);
        kasan_poison(right_redzone, padding_size + KASAN_ALLOCA_REDZONE_SIZE,
-                    KASAN_ALLOCA_RIGHT);
+                    KASAN_ALLOCA_RIGHT, false);
 }
 EXPORT_SYMBOL(__asan_alloca_poison);
 
@@ -306,7 +306,7 @@ void __asan_allocas_unpoison(const void *stack_top, const void *stack_bottom)
        if (unlikely(!stack_top || stack_top > stack_bottom))
                return;
 
-       kasan_unpoison(stack_top, stack_bottom - stack_top);
+       kasan_unpoison(stack_top, stack_bottom - stack_top, false);
 }
 EXPORT_SYMBOL(__asan_allocas_unpoison);
 

diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
index 0583033..071c456 100644 (file)
--- a/mm/kasan/kasan.h
+++ b/mm/kasan/kasan.h
@@ -359,7 +359,7 @@ static inline u8 kasan_random_tag(void) { return 0; }
 
 #ifdef CONFIG_KASAN_HW_TAGS
 
-static inline void kasan_poison(const void *addr, size_t size, u8 value)
+static inline void kasan_poison(const void *addr, size_t size, u8 value, bool init)
 {
        addr = kasan_reset_tag(addr);
 
@@ -372,10 +372,10 @@ static inline void kasan_poison(const void *addr, size_t size, u8 value)
        if (WARN_ON(size & KASAN_GRANULE_MASK))
                return;
 
-       hw_set_mem_tag_range((void *)addr, size, value, false);
+       hw_set_mem_tag_range((void *)addr, size, value, init);
 }
 
-static inline void kasan_unpoison(const void *addr, size_t size)
+static inline void kasan_unpoison(const void *addr, size_t size, bool init)
 {
        u8 tag = get_tag(addr);
 
@@ -389,7 +389,7 @@ static inline void kasan_unpoison(const void *addr, size_t size)
                return;
        size = round_up(size, KASAN_GRANULE_SIZE);
 
-       hw_set_mem_tag_range((void *)addr, size, tag, false);
+       hw_set_mem_tag_range((void *)addr, size, tag, init);
 }
 
 static inline bool kasan_byte_accessible(const void *addr)
@@ -407,22 +407,24 @@ static inline bool kasan_byte_accessible(const void *addr)
  * @addr - range start address, must be aligned to KASAN_GRANULE_SIZE
  * @size - range size, must be aligned to KASAN_GRANULE_SIZE
  * @value - value that's written to metadata for the range
+ * @init - whether to initialize the memory range (only for hardware tag-based)
  *
  * The size gets aligned to KASAN_GRANULE_SIZE before marking the range.
  */
-void kasan_poison(const void *addr, size_t size, u8 value);
+void kasan_poison(const void *addr, size_t size, u8 value, bool init);
 
 /**
  * kasan_unpoison - mark the memory range as accessible
  * @addr - range start address, must be aligned to KASAN_GRANULE_SIZE
  * @size - range size, can be unaligned
+ * @init - whether to initialize the memory range (only for hardware tag-based)
  *
  * For the tag-based modes, the @size gets aligned to KASAN_GRANULE_SIZE before
  * marking the range.
  * For the generic mode, the last granule of the memory range gets partially
  * unpoisoned based on the @size.
  */
-void kasan_unpoison(const void *addr, size_t size);
+void kasan_unpoison(const void *addr, size_t size, bool init);
 
 bool kasan_byte_accessible(const void *addr);
 

diff --git a/mm/kasan/shadow.c b/mm/kasan/shadow.c
index 63f4344..727ad46 100644 (file)
--- a/mm/kasan/shadow.c
+++ b/mm/kasan/shadow.c
@@ -69,7 +69,7 @@ void *memcpy(void *dest, const void *src, size_t len)
        return __memcpy(dest, src, len);
 }
 
-void kasan_poison(const void *addr, size_t size, u8 value)
+void kasan_poison(const void *addr, size_t size, u8 value, bool init)
 {
        void *shadow_start, *shadow_end;
 
@@ -106,7 +106,7 @@ void kasan_poison_last_granule(const void *addr, size_t size)
 }
 #endif
 
-void kasan_unpoison(const void *addr, size_t size)
+void kasan_unpoison(const void *addr, size_t size, bool init)
 {
        u8 tag = get_tag(addr);
 
@@ -129,7 +129,7 @@ void kasan_unpoison(const void *addr, size_t size)
                return;
 
        /* Unpoison all granules that cover the object. */
-       kasan_poison(addr, round_up(size, KASAN_GRANULE_SIZE), tag);
+       kasan_poison(addr, round_up(size, KASAN_GRANULE_SIZE), tag, false);
 
        /* Partially poison the last granule for the generic mode. */
        if (IS_ENABLED(CONFIG_KASAN_GENERIC))
@@ -344,7 +344,7 @@ void kasan_poison_vmalloc(const void *start, unsigned long size)
                return;
 
        size = round_up(size, KASAN_GRANULE_SIZE);
-       kasan_poison(start, size, KASAN_VMALLOC_INVALID);
+       kasan_poison(start, size, KASAN_VMALLOC_INVALID, false);
 }
 
 void kasan_unpoison_vmalloc(const void *start, unsigned long size)
@@ -352,7 +352,7 @@ void kasan_unpoison_vmalloc(const void *start, unsigned long size)
        if (!is_vmalloc_or_module_addr(start))
                return;
 
-       kasan_unpoison(start, size);
+       kasan_unpoison(start, size, false);
 }
 
 static int kasan_depopulate_vmalloc_pte(pte_t *ptep, unsigned long addr,

diff --git a/mm/kasan/sw_tags.c b/mm/kasan/sw_tags.c
index 00ae891..9df8e7f 100644 (file)
--- a/mm/kasan/sw_tags.c
+++ b/mm/kasan/sw_tags.c
@@ -163,7 +163,7 @@ EXPORT_SYMBOL(__hwasan_storeN_noabort);
 
 void __hwasan_tag_memory(unsigned long addr, u8 tag, unsigned long size)
 {
-       kasan_poison((void *)addr, size, tag);
+       kasan_poison((void *)addr, size, tag, false);
 }
 EXPORT_SYMBOL(__hwasan_tag_memory);