linux-kernel - Re: [PATCH bpf] selftests: bpf: fix detach from sockmap tests

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Date:   Thu, 09 Jul 2020 20:21:24 +0200
From:   Jakub Sitnicki <jakub@...udflare.com>
To:     Lorenz Bauer <lmb@...udflare.com>
Cc:     Shuah Khan <shuah@...nel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        kernel-team@...udflare.com, Martin KaFai Lau <kafai@...com>,
        linux-kselftest@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH bpf] selftests: bpf: fix detach from sockmap tests

On Thu, Jul 09, 2020 at 01:51 PM CEST, Lorenz Bauer wrote:
> Fix sockmap tests which rely on old bpf_prog_dispatch behaviour.
> In the first case, the tests check that detaching without giving
> a program succeeds. Since these are not the desired semantics,
> invert the condition. In the second case, the clean up code doesn't
> supply the necessary program fds.
>
> Reported-by: Martin KaFai Lau <kafai@...com>
> Signed-off-by: Lorenz Bauer <lmb@...udflare.com>
> Fixes: bb0de3131f4c ("bpf: sockmap: Require attach_bpf_fd when detaching a program")
> ---
>  tools/testing/selftests/bpf/test_maps.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/tools/testing/selftests/bpf/test_maps.c b/tools/testing/selftests/bpf/test_maps.c
> index 6a12a0e01e07..754cf611723e 100644
> --- a/tools/testing/selftests/bpf/test_maps.c
> +++ b/tools/testing/selftests/bpf/test_maps.c
> @@ -789,19 +789,19 @@ static void test_sockmap(unsigned int tasks, void *data)
>  	}
>  
>  	err = bpf_prog_detach(fd, BPF_SK_SKB_STREAM_PARSER);
> -	if (err) {
> +	if (!err) {
>  		printf("Failed empty parser prog detach\n");
>  		goto out_sockmap;
>  	}
>  
>  	err = bpf_prog_detach(fd, BPF_SK_SKB_STREAM_VERDICT);
> -	if (err) {
> +	if (!err) {
>  		printf("Failed empty verdict prog detach\n");
>  		goto out_sockmap;
>  	}
>  
>  	err = bpf_prog_detach(fd, BPF_SK_MSG_VERDICT);
> -	if (err) {
> +	if (!err) {
>  		printf("Failed empty msg verdict prog detach\n");
>  		goto out_sockmap;
>  	}
> @@ -1090,19 +1090,19 @@ static void test_sockmap(unsigned int tasks, void *data)
>  		assert(status == 0);
>  	}
>  
> -	err = bpf_prog_detach(map_fd_rx, __MAX_BPF_ATTACH_TYPE);
> +	err = bpf_prog_detach2(parse_prog, map_fd_rx, __MAX_BPF_ATTACH_TYPE);
>  	if (!err) {
>  		printf("Detached an invalid prog type.\n");
>  		goto out_sockmap;
>  	}
>  
> -	err = bpf_prog_detach(map_fd_rx, BPF_SK_SKB_STREAM_PARSER);
> +	err = bpf_prog_detach2(parse_prog, map_fd_rx, BPF_SK_SKB_STREAM_PARSER);
>  	if (err) {
>  		printf("Failed parser prog detach\n");
>  		goto out_sockmap;
>  	}
>  
> -	err = bpf_prog_detach(map_fd_rx, BPF_SK_SKB_STREAM_VERDICT);
> +	err = bpf_prog_detach2(verdict_prog, map_fd_rx, BPF_SK_SKB_STREAM_VERDICT);
>  	if (err) {
>  		printf("Failed parser prog detach\n");
>  		goto out_sockmap;

Reviewed-by: Jakub Sitnicki <jakub@...udflare.com>