kasan, mm: check kasan_enabled in annotations

Declare the kasan_enabled static key in include/linux/kasan.h and in
include/linux/mm.h and check it in all kasan annotations. This allows to
avoid any slowdown caused by function calls when kasan_enabled is
disabled.

Link: https://lkml.kernel.org/r/9f90e3c0aa840dbb4833367c2335193299f69023.1606162397.git.andreyknvl@google.com
Link: https://linux-review.googlesource.com/id/I2589451d3c96c97abbcbf714baabe6161c6f153e
Co-developed-by: Vincenzo Frascino <Vincenzo.Frascino@arm.com>
Signed-off-by: Vincenzo Frascino <Vincenzo.Frascino@arm.com>
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Marco Elver <elver@google.com>
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
Tested-by: Vincenzo Frascino <vincenzo.frascino@arm.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: Evgenii Stepanov <eugenis@google.com>
Cc: Kevin Brodsky <kevin.brodsky@arm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
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/include/linux/kasan.h b/include/linux/kasan.h
index 7350de3e9fe42854f2f6df3895c35b1cf6d1182d..9176849c49349df2fb7fe04b1029bc7bcee69d4e 100644 (file)
--- a/include/linux/kasan.h
+++ b/include/linux/kasan.h
@@ -2,6 +2,7 @@
 #ifndef _LINUX_KASAN_H
 #define _LINUX_KASAN_H
 
+#include <linux/static_key.h>
 #include <linux/types.h>
 
 struct kmem_cache;
@@ -75,54 +76,176 @@ static inline void kasan_disable_current(void) {}
 
 #ifdef CONFIG_KASAN
 
-void kasan_unpoison_range(const void *address, size_t size);
+struct kasan_cache {
+       int alloc_meta_offset;
+       int free_meta_offset;
+};
 
-void kasan_alloc_pages(struct page *page, unsigned int order);
-void kasan_free_pages(struct page *page, unsigned int order);
+#ifdef CONFIG_KASAN_HW_TAGS
+DECLARE_STATIC_KEY_FALSE(kasan_flag_enabled);
+static __always_inline bool kasan_enabled(void)
+{
+       return static_branch_likely(&kasan_flag_enabled);
+}
+#else
+static inline bool kasan_enabled(void)
+{
+       return true;
+}
+#endif
 
-void kasan_cache_create(struct kmem_cache *cache, unsigned int *size,
-                       slab_flags_t *flags);
+void __kasan_unpoison_range(const void *addr, size_t size);
+static __always_inline void kasan_unpoison_range(const void *addr, size_t size)
+{
+       if (kasan_enabled())
+               __kasan_unpoison_range(addr, size);
+}
 
-void kasan_poison_slab(struct page *page);
-void kasan_unpoison_object_data(struct kmem_cache *cache, void *object);
-void kasan_poison_object_data(struct kmem_cache *cache, void *object);
-void * __must_check kasan_init_slab_obj(struct kmem_cache *cache,
-                                       const void *object);
+void __kasan_alloc_pages(struct page *page, unsigned int order);
+static __always_inline void kasan_alloc_pages(struct page *page,
+                                               unsigned int order)
+{
+       if (kasan_enabled())
+               __kasan_alloc_pages(page, order);
+}
 
-void * __must_check kasan_kmalloc_large(const void *ptr, size_t size,
-                                               gfp_t flags);
-void kasan_kfree_large(void *ptr, unsigned long ip);
-void kasan_poison_kfree(void *ptr, unsigned long ip);
-void * __must_check kasan_kmalloc(struct kmem_cache *s, const void *object,
-                                       size_t size, gfp_t flags);
-void * __must_check kasan_krealloc(const void *object, size_t new_size,
-                                       gfp_t flags);
+void __kasan_free_pages(struct page *page, unsigned int order);
+static __always_inline void kasan_free_pages(struct page *page,
+                                               unsigned int order)
+{
+       if (kasan_enabled())
+               __kasan_free_pages(page, order);
+}
 
-void * __must_check kasan_slab_alloc(struct kmem_cache *s, void *object,
-                                       gfp_t flags);
-bool kasan_slab_free(struct kmem_cache *s, void *object, unsigned long ip);
+void __kasan_cache_create(struct kmem_cache *cache, unsigned int *size,
+                               slab_flags_t *flags);
+static __always_inline void kasan_cache_create(struct kmem_cache *cache,
+                               unsigned int *size, slab_flags_t *flags)
+{
+       if (kasan_enabled())
+               __kasan_cache_create(cache, size, flags);
+}
 
-struct kasan_cache {
-       int alloc_meta_offset;
-       int free_meta_offset;
-};
+size_t __kasan_metadata_size(struct kmem_cache *cache);
+static __always_inline size_t kasan_metadata_size(struct kmem_cache *cache)
+{
+       if (kasan_enabled())
+               return __kasan_metadata_size(cache);
+       return 0;
+}
+
+void __kasan_poison_slab(struct page *page);
+static __always_inline void kasan_poison_slab(struct page *page)
+{
+       if (kasan_enabled())
+               __kasan_poison_slab(page);
+}
+
+void __kasan_unpoison_object_data(struct kmem_cache *cache, void *object);
+static __always_inline void kasan_unpoison_object_data(struct kmem_cache *cache,
+                                                       void *object)
+{
+       if (kasan_enabled())
+               __kasan_unpoison_object_data(cache, object);
+}
+
+void __kasan_poison_object_data(struct kmem_cache *cache, void *object);
+static __always_inline void kasan_poison_object_data(struct kmem_cache *cache,
+                                                       void *object)
+{
+       if (kasan_enabled())
+               __kasan_poison_object_data(cache, object);
+}
+
+void * __must_check __kasan_init_slab_obj(struct kmem_cache *cache,
+                                         const void *object);
+static __always_inline void * __must_check kasan_init_slab_obj(
+                               struct kmem_cache *cache, const void *object)
+{
+       if (kasan_enabled())
+               return __kasan_init_slab_obj(cache, object);
+       return (void *)object;
+}
+
+bool __kasan_slab_free(struct kmem_cache *s, void *object, unsigned long ip);
+static __always_inline bool kasan_slab_free(struct kmem_cache *s, void *object,
+                                               unsigned long ip)
+{
+       if (kasan_enabled())
+               return __kasan_slab_free(s, object, ip);
+       return false;
+}
+
+void * __must_check __kasan_slab_alloc(struct kmem_cache *s,
+                                      void *object, gfp_t flags);
+static __always_inline void * __must_check kasan_slab_alloc(
+                               struct kmem_cache *s, void *object, gfp_t flags)
+{
+       if (kasan_enabled())
+               return __kasan_slab_alloc(s, object, flags);
+       return object;
+}
+
+void * __must_check __kasan_kmalloc(struct kmem_cache *s, const void *object,
+                                   size_t size, gfp_t flags);
+static __always_inline void * __must_check kasan_kmalloc(struct kmem_cache *s,
+                               const void *object, size_t size, gfp_t flags)
+{
+       if (kasan_enabled())
+               return __kasan_kmalloc(s, object, size, flags);
+       return (void *)object;
+}
 
-size_t kasan_metadata_size(struct kmem_cache *cache);
+void * __must_check __kasan_kmalloc_large(const void *ptr,
+                                         size_t size, gfp_t flags);
+static __always_inline void * __must_check kasan_kmalloc_large(const void *ptr,
+                                                     size_t size, gfp_t flags)
+{
+       if (kasan_enabled())
+               return __kasan_kmalloc_large(ptr, size, flags);
+       return (void *)ptr;
+}
+
+void * __must_check __kasan_krealloc(const void *object,
+                                    size_t new_size, gfp_t flags);
+static __always_inline void * __must_check kasan_krealloc(const void *object,
+                                                size_t new_size, gfp_t flags)
+{
+       if (kasan_enabled())
+               return __kasan_krealloc(object, new_size, flags);
+       return (void *)object;
+}
+
+void __kasan_poison_kfree(void *ptr, unsigned long ip);
+static __always_inline void kasan_poison_kfree(void *ptr, unsigned long ip)
+{
+       if (kasan_enabled())
+               __kasan_poison_kfree(ptr, ip);
+}
+
+void __kasan_kfree_large(void *ptr, unsigned long ip);
+static __always_inline void kasan_kfree_large(void *ptr, unsigned long ip)
+{
+       if (kasan_enabled())
+               __kasan_kfree_large(ptr, ip);
+}
 
 bool kasan_save_enable_multi_shot(void);
 void kasan_restore_multi_shot(bool enabled);
 
 #else /* CONFIG_KASAN */
 
+static inline bool kasan_enabled(void)
+{
+       return false;
+}
 static inline void kasan_unpoison_range(const void *address, size_t size) {}
-
 static inline void kasan_alloc_pages(struct page *page, unsigned int order) {}
 static inline void kasan_free_pages(struct page *page, unsigned int order) {}
-
 static inline void kasan_cache_create(struct kmem_cache *cache,
                                      unsigned int *size,
                                      slab_flags_t *flags) {}
-
+static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
 static inline void kasan_poison_slab(struct page *page) {}
 static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
                                        void *object) {}
@@ -133,36 +256,32 @@ static inline void *kasan_init_slab_obj(struct kmem_cache *cache,
 {
        return (void *)object;
 }
-
-static inline void *kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags)
+static inline bool kasan_slab_free(struct kmem_cache *s, void *object,
+                                  unsigned long ip)
 {
-       return ptr;
+       return false;
+}
+static inline void *kasan_slab_alloc(struct kmem_cache *s, void *object,
+                                  gfp_t flags)
+{
+       return object;
 }
-static inline void kasan_kfree_large(void *ptr, unsigned long ip) {}
-static inline void kasan_poison_kfree(void *ptr, unsigned long ip) {}
 static inline void *kasan_kmalloc(struct kmem_cache *s, const void *object,
                                size_t size, gfp_t flags)
 {
        return (void *)object;
 }
+static inline void *kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags)
+{
+       return (void *)ptr;
+}
 static inline void *kasan_krealloc(const void *object, size_t new_size,
                                 gfp_t flags)
 {
        return (void *)object;
 }
-
-static inline void *kasan_slab_alloc(struct kmem_cache *s, void *object,
-                                  gfp_t flags)
-{
-       return object;
-}
-static inline bool kasan_slab_free(struct kmem_cache *s, void *object,
-                                  unsigned long ip)
-{
-       return false;
-}
-
-static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
+static inline void kasan_poison_kfree(void *ptr, unsigned long ip) {}
+static inline void kasan_kfree_large(void *ptr, unsigned long ip) {}
 
 #endif /* CONFIG_KASAN */
 

diff --git a/include/linux/mm.h b/include/linux/mm.h
index 024ec0a00c72c61113b1ebfe23d15112981303c8..5299b90a6c403e3098d5402a60cd9318cde7eb72 100644 (file)
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -31,6 +31,7 @@
 #include <linux/sizes.h>
 #include <linux/sched.h>
 #include <linux/pgtable.h>
+#include <linux/kasan.h>
 
 struct mempolicy;
 struct anon_vma;
@@ -1422,22 +1423,30 @@ static inline bool cpupid_match_pid(struct task_struct *task, int cpupid)
 #endif /* CONFIG_NUMA_BALANCING */
 
 #if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS)
+
 static inline u8 page_kasan_tag(const struct page *page)
 {
-       return (page->flags >> KASAN_TAG_PGSHIFT) & KASAN_TAG_MASK;
+       if (kasan_enabled())
+               return (page->flags >> KASAN_TAG_PGSHIFT) & KASAN_TAG_MASK;
+       return 0xff;
 }
 
 static inline void page_kasan_tag_set(struct page *page, u8 tag)
 {
-       page->flags &= ~(KASAN_TAG_MASK << KASAN_TAG_PGSHIFT);
-       page->flags |= (tag & KASAN_TAG_MASK) << KASAN_TAG_PGSHIFT;
+       if (kasan_enabled()) {
+               page->flags &= ~(KASAN_TAG_MASK << KASAN_TAG_PGSHIFT);
+               page->flags |= (tag & KASAN_TAG_MASK) << KASAN_TAG_PGSHIFT;
+       }
 }
 
 static inline void page_kasan_tag_reset(struct page *page)
 {
-       page_kasan_tag_set(page, 0xff);
+       if (kasan_enabled())
+               page_kasan_tag_set(page, 0xff);
 }
-#else
+
+#else /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */
+
 static inline u8 page_kasan_tag(const struct page *page)
 {
        return 0xff;
@@ -1445,7 +1454,8 @@ static inline u8 page_kasan_tag(const struct page *page)
 
 static inline void page_kasan_tag_set(struct page *page, u8 tag) { }
 static inline void page_kasan_tag_reset(struct page *page) { }
-#endif
+
+#endif /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */
 
 static inline struct zone *page_zone(const struct page *page)
 {

diff --git a/mm/kasan/common.c b/mm/kasan/common.c
index 219c2979bd3e6c5e30364c70c0a969ab79fb290d..ae0130cf9de3d9fa14363e4079a32516b86b27f5 100644 (file)
--- a/mm/kasan/common.c
+++ b/mm/kasan/common.c
@@ -58,7 +58,7 @@ void kasan_disable_current(void)
 }
 #endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
 
-void kasan_unpoison_range(const void *address, size_t size)
+void __kasan_unpoison_range(const void *address, size_t size)
 {
        unpoison_range(address, size);
 }
@@ -86,7 +86,7 @@ asmlinkage void kasan_unpoison_task_stack_below(const void *watermark)
 }
 #endif /* CONFIG_KASAN_STACK */
 
-void kasan_alloc_pages(struct page *page, unsigned int order)
+void __kasan_alloc_pages(struct page *page, unsigned int order)
 {
        u8 tag;
        unsigned long i;
@@ -100,7 +100,7 @@ void kasan_alloc_pages(struct page *page, unsigned int order)
        unpoison_range(page_address(page), PAGE_SIZE << order);
 }
 
-void kasan_free_pages(struct page *page, unsigned int order)
+void __kasan_free_pages(struct page *page, unsigned int order)
 {
        if (likely(!PageHighMem(page)))
                poison_range(page_address(page),
@@ -127,8 +127,8 @@ static inline unsigned int optimal_redzone(unsigned int object_size)
                object_size <= (1 << 16) - 1024 ? 1024 : 2048;
 }
 
-void kasan_cache_create(struct kmem_cache *cache, unsigned int *size,
-                       slab_flags_t *flags)
+void __kasan_cache_create(struct kmem_cache *cache, unsigned int *size,
+                         slab_flags_t *flags)
 {
        unsigned int orig_size = *size;
        unsigned int redzone_size;
@@ -173,7 +173,7 @@ void kasan_cache_create(struct kmem_cache *cache, unsigned int *size,
        *flags |= SLAB_KASAN;
 }
 
-size_t kasan_metadata_size(struct kmem_cache *cache)
+size_t __kasan_metadata_size(struct kmem_cache *cache)
 {
        if (!kasan_stack_collection_enabled())
                return 0;
@@ -196,7 +196,7 @@ struct kasan_free_meta *kasan_get_free_meta(struct kmem_cache *cache,
        return kasan_reset_tag(object) + cache->kasan_info.free_meta_offset;
 }
 
-void kasan_poison_slab(struct page *page)
+void __kasan_poison_slab(struct page *page)
 {
        unsigned long i;
 
@@ -206,12 +206,12 @@ void kasan_poison_slab(struct page *page)
                     KASAN_KMALLOC_REDZONE);
 }
 
-void kasan_unpoison_object_data(struct kmem_cache *cache, void *object)
+void __kasan_unpoison_object_data(struct kmem_cache *cache, void *object)
 {
        unpoison_range(object, cache->object_size);
 }
 
-void kasan_poison_object_data(struct kmem_cache *cache, void *object)
+void __kasan_poison_object_data(struct kmem_cache *cache, void *object)
 {
        poison_range(object,
                        round_up(cache->object_size, KASAN_GRANULE_SIZE),
@@ -264,7 +264,7 @@ static u8 assign_tag(struct kmem_cache *cache, const void *object,
 #endif
 }
 
-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_meta;
@@ -283,7 +283,7 @@ void * __must_check kasan_init_slab_obj(struct kmem_cache *cache,
        return (void *)object;
 }
 
-static bool __kasan_slab_free(struct kmem_cache *cache, void *object,
+static bool ____kasan_slab_free(struct kmem_cache *cache, void *object,
                              unsigned long ip, bool quarantine)
 {
        u8 tag;
@@ -326,9 +326,9 @@ static bool __kasan_slab_free(struct kmem_cache *cache, void *object,
        return IS_ENABLED(CONFIG_KASAN_GENERIC);
 }
 
-bool kasan_slab_free(struct kmem_cache *cache, void *object, unsigned long ip)
+bool __kasan_slab_free(struct kmem_cache *cache, void *object, unsigned long ip)
 {
-       return __kasan_slab_free(cache, object, ip, true);
+       return ____kasan_slab_free(cache, object, ip, true);
 }
 
 static void set_alloc_info(struct kmem_cache *cache, void *object, gfp_t flags)
@@ -336,7 +336,7 @@ static void set_alloc_info(struct kmem_cache *cache, void *object, gfp_t flags)
        kasan_set_track(&kasan_get_alloc_meta(cache, object)->alloc_track, flags);
 }
 
-static void *__kasan_kmalloc(struct kmem_cache *cache, const void *object,
+static void *____kasan_kmalloc(struct kmem_cache *cache, const void *object,
                                size_t size, gfp_t flags, bool keep_tag)
 {
        unsigned long redzone_start;
@@ -368,20 +368,20 @@ static void *__kasan_kmalloc(struct kmem_cache *cache, const void *object,
        return set_tag(object, tag);
 }
 
-void * __must_check kasan_slab_alloc(struct kmem_cache *cache, void *object,
-                                       gfp_t flags)
+void * __must_check __kasan_slab_alloc(struct kmem_cache *cache,
+                                       void *object, gfp_t flags)
 {
-       return __kasan_kmalloc(cache, object, cache->object_size, flags, false);
+       return ____kasan_kmalloc(cache, object, cache->object_size, flags, false);
 }
 
-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);
+       return ____kasan_kmalloc(cache, object, size, flags, true);
 }
-EXPORT_SYMBOL(kasan_kmalloc);
+EXPORT_SYMBOL(__kasan_kmalloc);
 
-void * __must_check kasan_kmalloc_large(const void *ptr, size_t size,
+void * __must_check __kasan_kmalloc_large(const void *ptr, size_t size,
                                                gfp_t flags)
 {
        struct page *page;
@@ -406,7 +406,7 @@ void * __must_check kasan_kmalloc_large(const void *ptr, size_t size,
        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;
 
@@ -416,13 +416,13 @@ void * __must_check kasan_krealloc(const void *object, size_t size, gfp_t flags)
        page = virt_to_head_page(object);
 
        if (unlikely(!PageSlab(page)))
-               return kasan_kmalloc_large(object, size, flags);
+               return __kasan_kmalloc_large(object, size, flags);
        else
-               return __kasan_kmalloc(page->slab_cache, object, size,
+               return ____kasan_kmalloc(page->slab_cache, object, size,
                                                flags, true);
 }
 
-void kasan_poison_kfree(void *ptr, unsigned long ip)
+void __kasan_poison_kfree(void *ptr, unsigned long ip)
 {
        struct page *page;
 
@@ -435,11 +435,11 @@ void kasan_poison_kfree(void *ptr, unsigned long ip)
                }
                poison_range(ptr, page_size(page), KASAN_FREE_PAGE);
        } else {
-               __kasan_slab_free(page->slab_cache, ptr, ip, false);
+               ____kasan_slab_free(page->slab_cache, ptr, ip, false);
        }
 }
 
-void kasan_kfree_large(void *ptr, unsigned long ip)
+void __kasan_kfree_large(void *ptr, unsigned long ip)
 {
        if (ptr != page_address(virt_to_head_page(ptr)))
                kasan_report_invalid_free(ptr, ip);