From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=91.218.175.60 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794668868; b=n38jsVaXtzNaLFCE/hRjoiY3ZEwV94445JmWjQMx+Zdo2dKB6jR9pfHgQz62ortQlBvS qNVhPeM9Ul++oyNOpUMQVlh6i27mbWT3o2e/i2W0expJVahGQgdeVx48A5CyVmkytK2hp snlQLELoCMDzCNjybvtYu3WWgVZu1+PysJjKsb/oqt76flvmp9Z+wO98O1IHuHeNsWWCi hRmQJmqB7e2uuJW0dUk/MHja2Sk/AygqFNzADd3bdEabXSeJKL13+9lzcdwoW16qaINTV SHG0cYmPv+KVrlIjI1t1D2aSbFGTOYyRdGbUZb3pNlWv0gkD9eCJ5MhPwtc9XXbkUDw== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794668868; h=DMARC-Filter:X-Envelope-To:DKIM-Signature:X-Envelope-To:Received: X-Mizu-Trace-ID:X-Migadu-Flow:From:To:Cc:Subject:Date:Message-ID: X-Mailer:In-Reply-To:References:MIME-Version: Content-Transfer-Encoding; bh=OmPZUgt+py15CT8aehT7qnFQgx7RjbqNypkM7OmH+No=; b=s4ttvNYPIy7X+EcQy6ZH9eISDTgAlP8ghYemxK67APO1t+K4peZrX+c6WMtWqnj/iKD+ /25WdGs4ccW+wHb4EoBKVxzADejc6ar75m996IHxlyr+jbbxLa+PwE1flvYKiwfwDgsEc Jwh+/AjZ8PJnfb0za5NKwhQCCoNtceDljG1et0al5TX1OBghkb2hfr3Xsi6IckxhiBCyL PLJ/OkE75rxpmnQGwILFCRh6/35jdwqLa6+ZgYcOQdbpRZczYnoDcRWFG78SA37VdJfsi pfu+xELl2LJyJ72lmiaEAzQ3uUH5jn2vg+xF8se8esSun3BTRr0NdgyTWzGuCHHj5lA== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=GiZlHC0Y; arc=none smtp.remote-ip=91.218.175.60 Received: from mta0.migadu.com (out-60.mta0.migadu.com [91.218.175.60]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D3816606A339 for ; Sat, 14 Nov 2026 15:07:47 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org D3816606A339 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=GiZlHC0Y X-Envelope-To: linux-kselftest@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=We7VgYHnw9NhywvVPUAcVf+7e5SRu+JFh112Zj032lQ=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1794668866; v=1; x=1795273666; b=GiZlHC0YNEKpig1A+685dnFfKzQMuhAfLKaVrI0XQx26udLgBImGeNqvNtoz0yVQu2lCEEuH 9s2tA4pKzdNd6OF1NhuPiiZpywRc8yWU9wI555/ifO0NGZztV94AqOiDwcXhRJqIEtR8bzrluOz TZ0HQEjzvIowoBR/59Ir95zs= X-Envelope-To: linux-kselftest@vger.kernel.org Received: by smtp.migadu.com with ESMTPS id 808f5c65e072006d; Sat, 14 Nov 2026 15:07:45 +0000 X-Mizu-Trace-ID: 808f5c65e072006d X-Migadu-Flow: FLOW_OUT From: Leon Hwang To: bpf@vger.kernel.org Cc: Alexei Starovoitov , Daniel Borkmann , John Fastabend , Andrii Nakryiko , Eduard Zingerman , Kumar Kartikeya Dwivedi , Martin KaFai Lau , Song Liu , Yonghong Song , Jiri Olsa , Emil Tsalapatis , Ihor Solodrai , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , KP Singh , Matt Bobrowski , Shuah Khan , Leon Hwang , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH bpf-next v2 7/9] selftests/bpf: Verify tracing_multi link_create logs Date: Sat, 14 Nov 2026 23:06:08 +0800 Message-ID: <20261114150610.84507-8-leon.hwang@linux.dev> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20261114150610.84507-1-leon.hwang@linux.dev> References: <20261114150610.84507-1-leon.hwang@linux.dev> X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Check the error code, log message, and reported log size for a zero or excessive count, missing IDs, invalid flags, and a nonzero target FD. Signed-off-by: Leon Hwang --- .../selftests/bpf/prog_tests/tracing_link.c | 102 ++++++++++++++++++ 1 file changed, 102 insertions(+) diff --git a/tools/testing/selftests/bpf/prog_tests/tracing_link.c b/tools/testing/selftests/bpf/prog_tests/tracing_link.c index 28154fdd2f0c..49fd62478438 100644 --- a/tools/testing/selftests/bpf/prog_tests/tracing_link.c +++ b/tools/testing/selftests/bpf/prog_tests/tracing_link.c @@ -6,6 +6,7 @@ #include "xdp_dummy.skel.h" #include "kprobe_write_ctx.skel.h" #include "tracing_link_ctx.skel.h" +#include "tracing_multi_fail.skel.h" static void test_fentry_link_create_log(int target_fd, __u32 target_btf_id, int cookie, enum bpf_attach_type attach_type, @@ -325,3 +326,104 @@ void test_tracing_link_log(void) if (test__start_subtest("freplace_ctx_size")) test_log_freplace_ctx_size(); } + +static void test_tracing_multi_link_create_log(int target_fd, __u32 flags, const __u32 *ids, + __u32 cnt, int err_exp, const char *msg) +{ + struct tracing_multi_fail *skel; + char log_buf[128] = {}; + int err, fd, prog_fd; + LIBBPF_OPTS(bpf_log_opts, log_opts, + .buf = log_buf, + .size = sizeof(log_buf), + .level = 1, + ); + LIBBPF_OPTS(bpf_link_create_opts, opts, + .log_opts = &log_opts, + .flags = flags, + .tracing_multi.ids = ids, + .tracing_multi.cnt = cnt, + ); + + skel = tracing_multi_fail__open(); + if (!ASSERT_OK_PTR(skel, "tracing_multi_fail__open")) + return; + + bpf_program__set_autoload(skel->progs.test_fentry_s, false); + err = tracing_multi_fail__load(skel); + if (!ASSERT_OK(err, "tracing_multi_fail__load")) + goto out; + + prog_fd = bpf_program__fd(skel->progs.test_fentry); + fd = bpf_link_create(prog_fd, target_fd, BPF_TRACE_FENTRY_MULTI, &opts); + if (!ASSERT_LT(fd, 0, "bpf_link_create")) { + close(fd); + goto out; + } + + ASSERT_EQ(fd, err_exp, "err"); + ASSERT_STREQ(log_buf, msg, "log_buf"); + ASSERT_EQ(log_opts.true_size, strlen(msg) + 1, "log_size"); + +out: + tracing_multi_fail__destroy(skel); +} + +static void test_multi_log_zero_count(void) +{ + const char *msg = "tracing_multi.cnt cannot be zero.\n"; + __u32 id = 0; + + test_tracing_multi_link_create_log(0, 0, &id, 0, -EINVAL, msg); +} + +static void test_multi_log_missing_ids(void) +{ + const char *msg = "tracing_multi.ids must be set.\n"; + + test_tracing_multi_link_create_log(0, 0, NULL, 1, -EINVAL, msg); +} + +static void test_multi_log_excessive_count(void) +{ + const char *msg = "tracing_multi.cnt is too large.\n"; + __u32 id = 0; + + test_tracing_multi_link_create_log(0, 0, &id, INT_MAX, -E2BIG, msg); +} + +static void test_multi_log_invalid_flags(void) +{ + const char *msg = "Invalid flags.\n"; + __u32 id = 0; + + test_tracing_multi_link_create_log(0, 1, &id, 1, -EINVAL, msg); +} + +static void test_multi_log_invalid_target_fd(void) +{ + const char *msg = "Invalid target_fd.\n"; + __u32 id = 0; + + test_tracing_multi_link_create_log(-1, 0, &id, 1, -EINVAL, msg); +} + +void test_tracing_multi_link_log(void) +{ +#ifndef __x86_64__ + test__skip(); + return; +#endif + + if (test__start_subtest("zero_count")) + test_multi_log_zero_count(); + if (test__start_subtest("missing_ids")) + test_multi_log_missing_ids(); + if (test__start_subtest("excessive_count")) + test_multi_log_excessive_count(); + if (test__start_subtest("invalid_flags")) + test_multi_log_invalid_flags(); + if (test__start_subtest("invalid_target_fd")) + test_multi_log_invalid_target_fd(); +} + -- 2.55.0