netdev - Re: [PATCH net 1/2] selftests: tls: clean up uninitialized warnings

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Date:   Fri, 18 Jun 2021 23:02:42 +0100
From:   Vadim Fedorenko <vfedorenko@...ek.ru>
To:     Jakub Kicinski <kuba@...nel.org>, davem@...emloft.net
Cc:     netdev@...r.kernel.org, linux-kselftest@...r.kernel.org,
        shuah@...nel.org
Subject: Re: [PATCH net 1/2] selftests: tls: clean up uninitialized warnings

On 18.06.2021 21:25, Jakub Kicinski wrote:
> A bunch of tests uses uninitialized stack memory as random
> data to send. This is harmless but generates compiler warnings.
> Explicitly init the buffers with random data.
> 
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>
> ---
>   tools/testing/selftests/net/tls.c | 20 ++++++++++++++++++++
>   1 file changed, 20 insertions(+)
> 
> diff --git a/tools/testing/selftests/net/tls.c b/tools/testing/selftests/net/tls.c
> index 426d07875a48..58fea6eb588d 100644
> --- a/tools/testing/selftests/net/tls.c
> +++ b/tools/testing/selftests/net/tls.c
> @@ -25,6 +25,18 @@
>   #define TLS_PAYLOAD_MAX_LEN 16384
>   #define SOL_TLS 282
>   
> +static void memrnd(void *s, size_t n)
> +{
> +	int *dword = s;
> +	char *byte;
> +
> +	for (; n >= 4; n -= 4)
> +		*dword++ = rand();
> +	byte = (void *)dword;
> +	while (n--)
> +		*byte++ = rand();
> +}
> +
>   FIXTURE(tls_basic)
>   {
>   	int fd, cfd;
> @@ -308,6 +320,8 @@ TEST_F(tls, recv_max)
>   	char recv_mem[TLS_PAYLOAD_MAX_LEN];
>   	char buf[TLS_PAYLOAD_MAX_LEN];
>   
> +	memrnd(buf, sizeof(buf));
> +
>   	EXPECT_GE(send(self->fd, buf, send_len, 0), 0);
>   	EXPECT_NE(recv(self->cfd, recv_mem, send_len, 0), -1);
>   	EXPECT_EQ(memcmp(buf, recv_mem, send_len), 0);
> @@ -588,6 +602,8 @@ TEST_F(tls, recvmsg_single_max)
>   	struct iovec vec;
>   	struct msghdr hdr;
>   
> +	memrnd(send_mem, sizeof(send_mem));
> +
>   	EXPECT_EQ(send(self->fd, send_mem, send_len, 0), send_len);
>   	vec.iov_base = (char *)recv_mem;
>   	vec.iov_len = TLS_PAYLOAD_MAX_LEN;
> @@ -610,6 +626,8 @@ TEST_F(tls, recvmsg_multiple)
>   	struct msghdr hdr;
>   	int i;
>   
> +	memrnd(buf, sizeof(buf));
> +
>   	EXPECT_EQ(send(self->fd, buf, send_len, 0), send_len);
>   	for (i = 0; i < msg_iovlen; i++) {
>   		iov_base[i] = (char *)malloc(iov_len);
> @@ -634,6 +652,8 @@ TEST_F(tls, single_send_multiple_recv)
>   	char send_mem[TLS_PAYLOAD_MAX_LEN * 2];
>   	char recv_mem[TLS_PAYLOAD_MAX_LEN * 2];
>   
> +	memrnd(send_mem, sizeof(send_mem));
> +
>   	EXPECT_GE(send(self->fd, send_mem, total_len, 0), 0);
>   	memset(recv_mem, 0, total_len);
>   
> 

Acked-by: Vadim Fedorenko <vfedorenko@...ek.ru>