BACKPORT: mm, kasan: switch SLUB to stackdepot, enable memory quarantine for SLUB

For KASAN builds:
 - switch SLUB allocator to using stackdepot instead of storing the
   allocation/deallocation stacks in the objects;
 - change the freelist hook so that parts of the freelist can be put
   into the quarantine.

[aryabinin@virtuozzo.com: fixes]
  Link: http://lkml.kernel.org/r/1468601423-28676-1-git-send-email-aryabinin@virtuozzo.com
Link: http://lkml.kernel.org/r/1468347165-41906-3-git-send-email-glider@google.com
Signed-off-by: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <adech.fo@gmail.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Steven Rostedt (Red Hat) <rostedt@goodmis.org>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Kostya Serebryany <kcc@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Kuthonuzo Luruo <kuthonuzo.luruo@hpe.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Bug: 64145065
(cherry-picked from 80a9201a5965f4715d5c09790862e0df84ce0614)
Change-Id: I2b59c6d50d0db62d3609edfdc7be54e48f8afa5c
Signed-off-by: Paul Lawrence <paullawrence@google.com>

3 files changed, 9 insertions, 1 deletions

diff --git a/include/linux/kasan.h b/include/linux/kasan.h
index ac4b3c46a84d..c9cf374445d8 100644
--- a/include/linux/kasan.h
+++ b/include/linux/kasan.h
@@ -77,6 +77,7 @@ void kasan_free_shadow(const struct vm_struct *vm);
 
 size_t ksize(const void *);
 static inline void kasan_unpoison_slab(const void *ptr) { ksize(ptr); }
+size_t kasan_metadata_size(struct kmem_cache *cache);
 
 #else /* CONFIG_KASAN */
 
@@ -121,6 +122,7 @@ static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
 static inline void kasan_free_shadow(const struct vm_struct *vm) {}
 
 static inline void kasan_unpoison_slab(const void *ptr) { }
+static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
 
 #endif /* CONFIG_KASAN */
 
diff --git a/include/linux/slab_def.h b/include/linux/slab_def.h
index 8ba02e0cee35..bf16ba9f6fdb 100644
--- a/include/linux/slab_def.h
+++ b/include/linux/slab_def.h
@@ -83,7 +83,8 @@ struct kmem_cache {
 };
 
 static inline void *nearest_obj(struct kmem_cache *cache, struct page *page,
-				void *x) {
+				void *x)
+{
 	void *object = x - (x - page->s_mem) % cache->size;
 	void *last_object = page->s_mem + (cache->num - 1) * cache->size;
 
diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index d0f54fb58555..fd720e3dd1b8 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -99,6 +99,11 @@ struct kmem_cache {
 	 */
 	int remote_node_defrag_ratio;
 #endif
+
+#ifdef CONFIG_KASAN
+	struct kasan_cache kasan_info;
+#endif
+
 	struct kmem_cache_node *node[MAX_NUMNODES];
 };