linux-kernel - [PATCH] lib: test_ubsan: VLA no longer used in kernel

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Date:   Sun, 13 Jan 2019 10:32:10 -0800
From:   Olof Johansson <olof@...om.net>
To:     akpm@...ux-foundation.org
Cc:     jinb.park7@...il.com, colin.king@...onical.com,
        linux-kernel@...r.kernel.org, Olof Johansson <olof@...om.net>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Kees Cook <keescook@...omium.org>
Subject: [PATCH] lib: test_ubsan: VLA no longer used in kernel

Since we now build with -Wvla, any use of VLA throws a warning.
Including this test, so... maybe we should just remove the test?

lib/test_ubsan.c: In function 'test_ubsan_vla_bound_not_positive':
lib/test_ubsan.c:48:2: warning: ISO C90 forbids variable length array 'buf' [-Wvla]

For the out-of-bounds test, switch to non-VLA setup.

lib/test_ubsan.c: In function 'test_ubsan_out_of_bounds':
lib/test_ubsan.c:64:2: warning: ISO C90 forbids variable length array 'arr' [-Wvla]

Cc: Colin Ian King <colin.king@...onical.com>
Cc: Jinbum Park <jinb.park7@...il.com>
Cc: Andrey Ryabinin <aryabinin@...tuozzo.com>
Cc: Dmitry Vyukov <dvyukov@...gle.com>
Cc: Kees Cook <keescook@...omium.org>
Signed-off-by: Olof Johansson <olof@...om.net>

---
 lib/test_ubsan.c | 11 +----------
 1 file changed, 1 insertion(+), 10 deletions(-)

diff --git a/lib/test_ubsan.c b/lib/test_ubsan.c
index 280f4979d00ed..9ea10adf7a66f 100644
--- a/lib/test_ubsan.c
+++ b/lib/test_ubsan.c
@@ -42,14 +42,6 @@ static void test_ubsan_divrem_overflow(void)
 	val /= val2;
 }
 
-static void test_ubsan_vla_bound_not_positive(void)
-{
-	volatile int size = -1;
-	char buf[size];
-
-	(void)buf;
-}
-
 static void test_ubsan_shift_out_of_bounds(void)
 {
 	volatile int val = -1;
@@ -61,7 +53,7 @@ static void test_ubsan_shift_out_of_bounds(void)
 static void test_ubsan_out_of_bounds(void)
 {
 	volatile int i = 4, j = 5;
-	volatile int arr[i];
+	volatile int arr[4];
 
 	arr[j] = i;
 }
@@ -113,7 +105,6 @@ static const test_ubsan_fp test_ubsan_array[] = {
 	test_ubsan_mul_overflow,
 	test_ubsan_negate_overflow,
 	test_ubsan_divrem_overflow,
-	test_ubsan_vla_bound_not_positive,
 	test_ubsan_shift_out_of_bounds,
 	test_ubsan_out_of_bounds,
 	test_ubsan_load_invalid_value,
-- 
2.11.0