mm, kasan: add GFP flags to KASAN API

Add GFP flags to KASAN hooks for future patches to use.

This patch is based on the "mm: kasan: unified support for SLUB and SLAB
allocators" patch originally prepared by Dmitry Chernenkov.

Signed-off-by: Alexander Potapenko <glider@google.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Andrey Konovalov <adech.fo@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Konstantin Serebryany <kcc@google.com>
Cc: Dmitry Chernenkov <dmitryc@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

8 files changed, 48 insertions, 42 deletions

diff --git a/include/linux/kasan.h b/include/linux/kasan.h
index 839f2007a0f9..737371b56044 100644
--- a/include/linux/kasan.h
+++ b/include/linux/kasan.h
@@ -55,13 +55,14 @@ 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 kasan_kmalloc_large(const void *ptr, size_t size);
+void kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags);
 void kasan_kfree_large(const void *ptr);
 void kasan_kfree(void *ptr);
-void kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size);
-void kasan_krealloc(const void *object, size_t new_size);
+void kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size,
+                  gfp_t flags);
+void kasan_krealloc(const void *object, size_t new_size, gfp_t flags);
 
-void kasan_slab_alloc(struct kmem_cache *s, void *object);
+void kasan_slab_alloc(struct kmem_cache *s, void *object, gfp_t flags);
 void kasan_slab_free(struct kmem_cache *s, void *object);
 
 struct kasan_cache {
@@ -94,14 +95,16 @@ static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
 static inline void kasan_poison_object_data(struct kmem_cache *cache,
                                         void *object) {}
 
-static inline void kasan_kmalloc_large(void *ptr, size_t size) {}
+static inline void kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags) {}
 static inline void kasan_kfree_large(const void *ptr) {}
 static inline void kasan_kfree(void *ptr) {}
 static inline void kasan_kmalloc(struct kmem_cache *s, const void *object,
-                                size_t size) {}
-static inline void kasan_krealloc(const void *object, size_t new_size) {}
+                                size_t size, gfp_t flags) {}
+static inline void kasan_krealloc(const void *object, size_t new_size,
+                                 gfp_t flags) {}
 
-static inline void kasan_slab_alloc(struct kmem_cache *s, void *object) {}
+static inline void kasan_slab_alloc(struct kmem_cache *s, void *object,
+                                   gfp_t flags) {}
 static inline void kasan_slab_free(struct kmem_cache *s, void *object) {}
 
 static inline int kasan_module_alloc(void *addr, size_t size) { return 0; }
diff --git a/include/linux/slab.h b/include/linux/slab.h
index aa61595a1482..508bd827e6dc 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -376,7 +376,7 @@ static __always_inline void *kmem_cache_alloc_trace(struct kmem_cache *s,
 {
         void *ret = kmem_cache_alloc(s, flags);
 
-        kasan_kmalloc(s, ret, size);
+        kasan_kmalloc(s, ret, size, flags);
         return ret;
 }
 
@@ -387,7 +387,7 @@ kmem_cache_alloc_node_trace(struct kmem_cache *s,
 {
         void *ret = kmem_cache_alloc_node(s, gfpflags, node);
 
-        kasan_kmalloc(s, ret, size);
+        kasan_kmalloc(s, ret, size, gfpflags);
         return ret;
 }
 #endif /* CONFIG_TRACING */
diff --git a/mm/kasan/kasan.c b/mm/kasan/kasan.c
index 7c82509ef169..cb998e0ec9d3 100644
--- a/mm/kasan/kasan.c
+++ b/mm/kasan/kasan.c
@@ -434,9 +434,9 @@ struct kasan_free_meta *get_free_info(struct kmem_cache *cache,
 }
 #endif
 
-void kasan_slab_alloc(struct kmem_cache *cache, void *object)
+void kasan_slab_alloc(struct kmem_cache *cache, void *object, gfp_t flags)
 {
-        kasan_kmalloc(cache, object, cache->object_size);
+        kasan_kmalloc(cache, object, cache->object_size, flags);
 }
 
 void kasan_slab_free(struct kmem_cache *cache, void *object)
@@ -462,7 +462,8 @@ void kasan_slab_free(struct kmem_cache *cache, void *object)
         kasan_poison_shadow(object, rounded_up_size, KASAN_KMALLOC_FREE);
 }
 
-void kasan_kmalloc(struct kmem_cache *cache, const void *object, size_t size)
+void kasan_kmalloc(struct kmem_cache *cache, const void *object, size_t size,
+                   gfp_t flags)
 {
         unsigned long redzone_start;
         unsigned long redzone_end;
@@ -491,7 +492,7 @@ void kasan_kmalloc(struct kmem_cache *cache, const void *object, size_t size)
 }
 EXPORT_SYMBOL(kasan_kmalloc);
 
-void kasan_kmalloc_large(const void *ptr, size_t size)
+void kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags)
 {
         struct page *page;
         unsigned long redzone_start;
@@ -510,7 +511,7 @@ void kasan_kmalloc_large(const void *ptr, size_t size)
                 KASAN_PAGE_REDZONE);
 }
 
-void kasan_krealloc(const void *object, size_t size)
+void kasan_krealloc(const void *object, size_t size, gfp_t flags)
 {
         struct page *page;
 
@@ -520,9 +521,9 @@ void kasan_krealloc(const void *object, size_t size)
         page = virt_to_head_page(object);
 
         if (unlikely(!PageSlab(page)))
-                kasan_kmalloc_large(object, size);
+                kasan_kmalloc_large(object, size, flags);
         else
-                kasan_kmalloc(page->slab_cache, object, size);
+                kasan_kmalloc(page->slab_cache, object, size, flags);
 }
 
 void kasan_kfree(void *ptr)
diff --git a/mm/mempool.c b/mm/mempool.c
index 07c383ddbbab..9b7a14a791cc 100644
--- a/mm/mempool.c
+++ b/mm/mempool.c
@@ -112,12 +112,12 @@ static void kasan_poison_element(mempool_t *pool, void *element)
                 kasan_free_pages(element, (unsigned long)pool->pool_data);
 }
 
-static void kasan_unpoison_element(mempool_t *pool, void *element)
+static void kasan_unpoison_element(mempool_t *pool, void *element, gfp_t flags)
 {
         if (pool->alloc == mempool_alloc_slab)
-                kasan_slab_alloc(pool->pool_data, element);
+                kasan_slab_alloc(pool->pool_data, element, flags);
         if (pool->alloc == mempool_kmalloc)
-                kasan_krealloc(element, (size_t)pool->pool_data);
+                kasan_krealloc(element, (size_t)pool->pool_data, flags);
         if (pool->alloc == mempool_alloc_pages)
                 kasan_alloc_pages(element, (unsigned long)pool->pool_data);
 }
@@ -130,12 +130,12 @@ static void add_element(mempool_t *pool, void *element)
         pool->elements[pool->curr_nr++] = element;
 }
 
-static void *remove_element(mempool_t *pool)
+static void *remove_element(mempool_t *pool, gfp_t flags)
 {
         void *element = pool->elements[--pool->curr_nr];
 
         BUG_ON(pool->curr_nr < 0);
-        kasan_unpoison_element(pool, element);
+        kasan_unpoison_element(pool, element, flags);
         check_element(pool, element);
         return element;
 }
@@ -154,7 +154,7 @@ void mempool_destroy(mempool_t *pool)
                 return;
 
         while (pool->curr_nr) {
-                void *element = remove_element(pool);
+                void *element = remove_element(pool, GFP_KERNEL);
                 pool->free(element, pool->pool_data);
         }
         kfree(pool->elements);
@@ -250,7 +250,7 @@ int mempool_resize(mempool_t *pool, int new_min_nr)
         spin_lock_irqsave(&pool->lock, flags);
         if (new_min_nr <= pool->min_nr) {
                 while (new_min_nr < pool->curr_nr) {
-                        element = remove_element(pool);
+                        element = remove_element(pool, GFP_KERNEL);
                         spin_unlock_irqrestore(&pool->lock, flags);
                         pool->free(element, pool->pool_data);
                         spin_lock_irqsave(&pool->lock, flags);
@@ -347,7 +347,7 @@ repeat_alloc:
 
         spin_lock_irqsave(&pool->lock, flags);
         if (likely(pool->curr_nr)) {
-                element = remove_element(pool);
+                element = remove_element(pool, gfp_temp);
                 spin_unlock_irqrestore(&pool->lock, flags);
                 /* paired with rmb in mempool_free(), read comment there */
                 smp_wmb();
diff --git a/mm/slab.c b/mm/slab.c
index 7515578471d8..17e2848979c5 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -3378,7 +3378,7 @@ void *kmem_cache_alloc(struct kmem_cache *cachep, gfp_t flags)
 {
         void *ret = slab_alloc(cachep, flags, _RET_IP_);
 
-        kasan_slab_alloc(cachep, ret);
+        kasan_slab_alloc(cachep, ret, flags);
         trace_kmem_cache_alloc(_RET_IP_, ret,
                                cachep->object_size, cachep->size, flags);
 
@@ -3444,7 +3444,7 @@ kmem_cache_alloc_trace(struct kmem_cache *cachep, gfp_t flags, size_t size)
 
         ret = slab_alloc(cachep, flags, _RET_IP_);
 
-        kasan_kmalloc(cachep, ret, size);
+        kasan_kmalloc(cachep, ret, size, flags);
         trace_kmalloc(_RET_IP_, ret,
                       size, cachep->size, flags);
         return ret;
@@ -3468,7 +3468,7 @@ void *kmem_cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid)
 {
         void *ret = slab_alloc_node(cachep, flags, nodeid, _RET_IP_);
 
-        kasan_slab_alloc(cachep, ret);
+        kasan_slab_alloc(cachep, ret, flags);
         trace_kmem_cache_alloc_node(_RET_IP_, ret,
                                     cachep->object_size, cachep->size,
                                     flags, nodeid);
@@ -3486,7 +3486,8 @@ void *kmem_cache_alloc_node_trace(struct kmem_cache *cachep,
         void *ret;
 
         ret = slab_alloc_node(cachep, flags, nodeid, _RET_IP_);
-        kasan_kmalloc(cachep, ret, size);
+
+        kasan_kmalloc(cachep, ret, size, flags);
         trace_kmalloc_node(_RET_IP_, ret,
                            size, cachep->size,
                            flags, nodeid);
@@ -3505,7 +3506,7 @@ __do_kmalloc_node(size_t size, gfp_t flags, int node, unsigned long caller)
         if (unlikely(ZERO_OR_NULL_PTR(cachep)))
                 return cachep;
         ret = kmem_cache_alloc_node_trace(cachep, flags, node, size);
-        kasan_kmalloc(cachep, ret, size);
+        kasan_kmalloc(cachep, ret, size, flags);
 
         return ret;
 }
@@ -3541,7 +3542,7 @@ static __always_inline void *__do_kmalloc(size_t size, gfp_t flags,
                 return cachep;
         ret = slab_alloc(cachep, flags, caller);
 
-        kasan_kmalloc(cachep, ret, size);
+        kasan_kmalloc(cachep, ret, size, flags);
         trace_kmalloc(caller, ret,
                       size, cachep->size, flags);
 
@@ -4323,7 +4324,7 @@ size_t ksize(const void *objp)
         /* We assume that ksize callers could use the whole allocated area,
          * so we need to unpoison this area.
          */
-        kasan_krealloc(objp, size);
+        kasan_krealloc(objp, size, GFP_NOWAIT);
 
         return size;
 }
diff --git a/mm/slab.h b/mm/slab.h
index ff39a8fc3b3f..5969769fbee6 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -405,7 +405,7 @@ static inline void slab_post_alloc_hook(struct kmem_cache *s, gfp_t flags,
                 kmemcheck_slab_alloc(s, flags, object, slab_ksize(s));
                 kmemleak_alloc_recursive(object, s->object_size, 1,
                                          s->flags, flags);
-                kasan_slab_alloc(s, object);
+                kasan_slab_alloc(s, object, flags);
         }
         memcg_kmem_put_cache(s);
 }
diff --git a/mm/slab_common.c b/mm/slab_common.c
index 4de72e220c82..3239bfd758e6 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -1013,7 +1013,7 @@ void *kmalloc_order(size_t size, gfp_t flags, unsigned int order)
         page = alloc_kmem_pages(flags, order);
         ret = page ? page_address(page) : NULL;
         kmemleak_alloc(ret, size, 1, flags);
-        kasan_kmalloc_large(ret, size);
+        kasan_kmalloc_large(ret, size, flags);
         return ret;
 }
 EXPORT_SYMBOL(kmalloc_order);
@@ -1192,7 +1192,7 @@ static __always_inline void *__do_krealloc(const void *p, size_t new_size,
                 ks = ksize(p);
 
         if (ks >= new_size) {
-                kasan_krealloc((void *)p, new_size);
+                kasan_krealloc((void *)p, new_size, flags);
                 return (void *)p;
         }
 
diff --git a/mm/slub.c b/mm/slub.c
index 7277413ebc8b..4dbb109eb8cd 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1313,7 +1313,7 @@ static inline void dec_slabs_node(struct kmem_cache *s, int node,
 static inline void kmalloc_large_node_hook(void *ptr, size_t size, gfp_t flags)
 {
         kmemleak_alloc(ptr, size, 1, flags);
-        kasan_kmalloc_large(ptr, size);
+        kasan_kmalloc_large(ptr, size, flags);
 }
 
 static inline void kfree_hook(const void *x)
@@ -2596,7 +2596,7 @@ void *kmem_cache_alloc_trace(struct kmem_cache *s, gfp_t gfpflags, size_t size)
 {
         void *ret = slab_alloc(s, gfpflags, _RET_IP_);
         trace_kmalloc(_RET_IP_, ret, size, s->size, gfpflags);
-        kasan_kmalloc(s, ret, size);
+        kasan_kmalloc(s, ret, size, gfpflags);
         return ret;
 }
 EXPORT_SYMBOL(kmem_cache_alloc_trace);
@@ -2624,7 +2624,7 @@ void *kmem_cache_alloc_node_trace(struct kmem_cache *s,
         trace_kmalloc_node(_RET_IP_, ret,
                            size, s->size, gfpflags, node);
 
-        kasan_kmalloc(s, ret, size);
+        kasan_kmalloc(s, ret, size, gfpflags);
         return ret;
 }
 EXPORT_SYMBOL(kmem_cache_alloc_node_trace);
@@ -3182,7 +3182,8 @@ static void early_kmem_cache_node_alloc(int node)
         init_object(kmem_cache_node, n, SLUB_RED_ACTIVE);
         init_tracking(kmem_cache_node, n);
 #endif
-        kasan_kmalloc(kmem_cache_node, n, sizeof(struct kmem_cache_node));
+        kasan_kmalloc(kmem_cache_node, n, sizeof(struct kmem_cache_node),
+                      GFP_KERNEL);
         init_kmem_cache_node(n);
         inc_slabs_node(kmem_cache_node, node, page->objects);
 
@@ -3561,7 +3562,7 @@ void *__kmalloc(size_t size, gfp_t flags)
 
         trace_kmalloc(_RET_IP_, ret, size, s->size, flags);
 
-        kasan_kmalloc(s, ret, size);
+        kasan_kmalloc(s, ret, size, flags);
 
         return ret;
 }
@@ -3606,7 +3607,7 @@ void *__kmalloc_node(size_t size, gfp_t flags, int node)
 
         trace_kmalloc_node(_RET_IP_, ret, size, s->size, flags, node);
 
-        kasan_kmalloc(s, ret, size);
+        kasan_kmalloc(s, ret, size, flags);
 
         return ret;
 }
@@ -3635,7 +3636,7 @@ size_t ksize(const void *object)
         size_t size = __ksize(object);
         /* We assume that ksize callers could use whole allocated area,
            so we need unpoison this area. */
-        kasan_krealloc(object, size);
+        kasan_krealloc(object, size, GFP_NOWAIT);
         return size;
 }
 EXPORT_SYMBOL(ksize);