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Miller" , Jesper Dangaard Brouer , Andrea Arcangeli , Clark Williams , bpf@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH bpf v2 2/2] bpf/selftests: test that kernel rejects a TCP CC with an invalid license Date: Thu, 25 Mar 2021 22:11:22 +0100 Message-Id: <20210325211122.98620-2-toke@redhat.com> X-Mailer: git-send-email 2.31.0 In-Reply-To: <20210325211122.98620-1-toke@redhat.com> References: <20210325211122.98620-1-toke@redhat.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net This adds a selftest to check that the verifier rejects a TCP CC struct_ops with a non-GPL license. v2: - Use a minimal struct_ops BPF program instead of rewriting bpf_dctcp's license in memory. - Check for the verifier reject message instead of just the return code. Signed-off-by: Toke Høiland-Jørgensen Acked-by: Martin KaFai Lau --- .../selftests/bpf/prog_tests/bpf_tcp_ca.c | 44 +++++++++++++++++++ .../selftests/bpf/progs/bpf_nogpltcp.c | 19 ++++++++ 2 files changed, 63 insertions(+) create mode 100644 tools/testing/selftests/bpf/progs/bpf_nogpltcp.c diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c b/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c index 37c5494a0381..a09c716528e1 100644 --- a/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c +++ b/tools/testing/selftests/bpf/prog_tests/bpf_tcp_ca.c @@ -6,6 +6,7 @@ #include #include "bpf_dctcp.skel.h" #include "bpf_cubic.skel.h" +#include "bpf_nogpltcp.skel.h" #define min(a, b) ((a) < (b) ? (a) : (b)) @@ -227,10 +228,53 @@ static void test_dctcp(void) bpf_dctcp__destroy(dctcp_skel); } +static char *err_str = NULL; +static bool found = false; + +static int libbpf_debug_print(enum libbpf_print_level level, + const char *format, va_list args) +{ + char *log_buf; + + if (level != LIBBPF_WARN || + strcmp(format, "libbpf: \n%s\n")) { + vprintf(format, args); + return 0; + } + + log_buf = va_arg(args, char *); + if (!log_buf) + goto out; + if (err_str && strstr(log_buf, err_str) != NULL) + found = true; +out: + printf(format, log_buf); + return 0; +} + +static void test_invalid_license(void) +{ + libbpf_print_fn_t old_print_fn = NULL; + struct bpf_nogpltcp *skel; + + err_str = "struct ops programs must have a GPL compatible license"; + old_print_fn = libbpf_set_print(libbpf_debug_print); + + skel = bpf_nogpltcp__open_and_load(); + if (CHECK(skel, "bpf_nogplgtcp__open_and_load()", "didn't fail\n")) + bpf_nogpltcp__destroy(skel); + + CHECK(!found, "errmsg check", "expected string '%s'", err_str); + + libbpf_set_print(old_print_fn); +} + void test_bpf_tcp_ca(void) { if (test__start_subtest("dctcp")) test_dctcp(); if (test__start_subtest("cubic")) test_cubic(); + if (test__start_subtest("invalid_license")) + test_invalid_license(); } diff --git a/tools/testing/selftests/bpf/progs/bpf_nogpltcp.c b/tools/testing/selftests/bpf/progs/bpf_nogpltcp.c new file mode 100644 index 000000000000..2ecd833dcd41 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/bpf_nogpltcp.c @@ -0,0 +1,19 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include +#include +#include +#include "bpf_tcp_helpers.h" + +char _license[] SEC("license") = "X"; + +void BPF_STRUCT_OPS(nogpltcp_init, struct sock *sk) +{ +} + +SEC(".struct_ops") +struct tcp_congestion_ops bpf_nogpltcp = { + .init = (void *)nogpltcp_init, + .name = "bpf_nogpltcp", +};