linux-kernel - [PATCH] kasan: add test for -fsanitize-address-use-after-scope

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Date:   Mon,  5 Dec 2016 15:16:15 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     akpm@...ux-foundation.org
Cc:     dvyukov@...gle.com, linux-kernel@...r.kernel.org,
        marxin <mliska@...e.cz>, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH] kasan: add test for -fsanitize-address-use-after-scope

From: marxin <mliska@...e.cz>

In commit 828347f8f9a5 ("kasan: support use-after-scope detection") we
added support for use-after-scope. Let's add a check if it actually
works.

Signed-off-by: Martin Liska <mliska@...e.cz>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 lib/test_kasan.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/lib/test_kasan.c b/lib/test_kasan.c
index fbdf87920093..32f31b8d306e 100644
--- a/lib/test_kasan.c
+++ b/lib/test_kasan.c
@@ -352,6 +352,19 @@ static noinline void __init kasan_stack_oob(void)
 	*(volatile char *)p;
 }
 
+static noinline void __init kasan_stack_use_after_scope(void)
+{
+	char *ptr = NULL;
+	{
+		char a;
+
+		ptr = &a;
+	}
+
+	pr_info("use-after-scope on stack\n");
+	*(volatile char *)ptr;
+}
+
 static noinline void __init ksize_unpoisons_memory(void)
 {
 	char *ptr;
@@ -461,6 +474,7 @@ static int __init kmalloc_tests_init(void)
 	kmalloc_uaf2();
 	kmem_cache_oob();
 	kasan_stack_oob();
+	kasan_stack_use_after_scope();
 	kasan_global_oob();
 	ksize_unpoisons_memory();
 	copy_user_test();
-- 
2.11.0