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-rw-r--r--mm/kasan/kasan.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/mm/kasan/kasan.c b/mm/kasan/kasan.c
index 70c009741aab..0e9505f66ec1 100644
--- a/mm/kasan/kasan.c
+++ b/mm/kasan/kasan.c
@@ -764,6 +764,25 @@ EXPORT_SYMBOL(__asan_storeN_noabort);
void __asan_handle_no_return(void) {}
EXPORT_SYMBOL(__asan_handle_no_return);
+/* Emitted by compiler to poison large objects when they go out of scope. */
+void __asan_poison_stack_memory(const void *addr, size_t size)
+{
+ /*
+ * Addr is KASAN_SHADOW_SCALE_SIZE-aligned and the object is surrounded
+ * by redzones, so we simply round up size to simplify logic.
+ */
+ kasan_poison_shadow(addr, round_up(size, KASAN_SHADOW_SCALE_SIZE),
+ KASAN_USE_AFTER_SCOPE);
+}
+EXPORT_SYMBOL(__asan_poison_stack_memory);
+
+/* Emitted by compiler to unpoison large objects when they go into scope. */
+void __asan_unpoison_stack_memory(const void *addr, size_t size)
+{
+ kasan_unpoison_shadow(addr, size);
+}
+EXPORT_SYMBOL(__asan_unpoison_stack_memory);
+
#ifdef CONFIG_MEMORY_HOTPLUG
static int kasan_mem_notifier(struct notifier_block *nb,
unsigned long action, void *data)