kasan: don't use __builtin_return_address(1)

__builtin_return_address(1) is unreliable without frame pointers.
With defconfig on kmalloc_pagealloc_invalid_free test I am getting:

BUG: KASAN: double-free or invalid-free in           (null)

Pass caller PC from callers explicitly.

Link: http://lkml.kernel.org/r/9b01bc2d237a4df74ff8472a3bf6b7635908de01.1514378558.git.dvyukov@google.com
Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>a
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 7 insertions, 7 deletions

diff --git a/mm/kasan/kasan.c b/mm/kasan/kasan.c
index ecb64fda79e6..32f555ded938 100644
--- a/mm/kasan/kasan.c
+++ b/mm/kasan/kasan.c
@@ -501,7 +501,7 @@ static void kasan_poison_slab_free(struct kmem_cache *cache, void *object)
 	kasan_poison_shadow(object, rounded_up_size, KASAN_KMALLOC_FREE);
 }
 
-bool kasan_slab_free(struct kmem_cache *cache, void *object)
+bool kasan_slab_free(struct kmem_cache *cache, void *object, unsigned long ip)
 {
 	s8 shadow_byte;
 
@@ -511,7 +511,7 @@ bool kasan_slab_free(struct kmem_cache *cache, void *object)
 
 	shadow_byte = READ_ONCE(*(s8 *)kasan_mem_to_shadow(object));
 	if (shadow_byte < 0 || shadow_byte >= KASAN_SHADOW_SCALE_SIZE) {
-		kasan_report_invalid_free(object, __builtin_return_address(1));
+		kasan_report_invalid_free(object, ip);
 		return true;
 	}
 
@@ -601,10 +601,10 @@ void kasan_poison_kfree(void *ptr)
 		kasan_poison_slab_free(page->slab_cache, ptr);
 }
 
-void kasan_kfree_large(void *ptr)
+void kasan_kfree_large(void *ptr, unsigned long ip)
 {
 	if (ptr != page_address(virt_to_head_page(ptr)))
-		kasan_report_invalid_free(ptr, __builtin_return_address(1));
+		kasan_report_invalid_free(ptr, ip);
 	/* The object will be poisoned by page_alloc. */
 }
 
diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h
index bf353a18c908..c12dcfde2ebd 100644
--- a/mm/kasan/kasan.h
+++ b/mm/kasan/kasan.h
@@ -107,7 +107,7 @@ static inline const void *kasan_shadow_to_mem(const void *shadow_addr)
 
 void kasan_report(unsigned long addr, size_t size,
 		bool is_write, unsigned long ip);
-void kasan_report_invalid_free(void *object, void *ip);
+void kasan_report_invalid_free(void *object, unsigned long ip);
 
 #if defined(CONFIG_SLAB) || defined(CONFIG_SLUB)
 void quarantine_put(struct kasan_free_meta *info, struct kmem_cache *cache);
diff --git a/mm/kasan/report.c b/mm/kasan/report.c
index 55916ad21722..75206991ece0 100644
--- a/mm/kasan/report.c
+++ b/mm/kasan/report.c
@@ -326,12 +326,12 @@ static void print_shadow_for_address(const void *addr)
 	}
 }
 
-void kasan_report_invalid_free(void *object, void *ip)
+void kasan_report_invalid_free(void *object, unsigned long ip)
 {
 	unsigned long flags;
 
 	kasan_start_report(&flags);
-	pr_err("BUG: KASAN: double-free or invalid-free in %pS\n", ip);
+	pr_err("BUG: KASAN: double-free or invalid-free in %pS\n", (void *)ip);
 	pr_err("\n");
 	print_address_description(object);
 	pr_err("\n");