From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-179.mta1.migadu.com (out-179.mta1.migadu.com [95.215.58.179]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AD88525743D; Tue, 18 Nov 2025 12:59:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.179 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763470760; cv=none; b=Y3niXQTz1kZ2V1GHGuIa0tiiOVb5Rgt3ekCDFRgIe/0r7xgKtnd+R6gm7kf4+JuyEYZAWfpTJow8WMToKOHjDBEVy56y+NDWizIp2i21MY3vjqStuCR5GWyrYpQDOlF90KM5m3GvSlFD6ONZCjXl096X8LmcMziA3ZM4oP18+0c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763470760; c=relaxed/simple; bh=qOgl1fiIunAohbrmTWcIWvaOKXsMC7k+mnALoNDYY8I=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=K17fz8mNKg9OQ4iSWPPni34w0vprA/SAN6uGytVKdtbwBIFWLCFY/H2UL4sZ4K/QdR4pMFIzj/Oj0s8oa1sPma1fAUCOauhn8uJ6HXiu6cQ+05zpniFx/X3VuHolqb7IwglEB9yinBYjuMm6jpgNykpdGCn+gcMUEuLeDgcC7qg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=pOFemZRT; arc=none smtp.client-ip=95.215.58.179 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) header.d=linux.dev header.i=@linux.dev header.b="pOFemZRT" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1763470755; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=N6E2UNdn2tzAwp/0JtLmgN7RTjX6PfzmkTfK6J+H5U4=; b=pOFemZRT7RnQa7L6Jtj+JtJnH+eyZHbm/YAoA0lIl9HVJPwxaM0XS845/5tEhCb2fZoho0 tFuBySwAg3ZYFi/ia5fz6yqgCvHsArNmd0ywlJpvsB4xHz0P27TbeWGG0K1dbar4WL+bHx qnCyJx58yoDBcQ5RLBR+tdUVW41ZVNs= From: Tao Chen To: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, martin.lau@linux.dev, eddyz87@gmail.com, song@kernel.org, yonghong.song@linux.dev, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@fomichev.me, haoluo@google.com, jolsa@kernel.org Cc: bpf@vger.kernel.org, linux-kernel@vger.kernel.org, Tao Chen Subject: [PATCH bpf-next 2/2] selftests/bpf: Add bpf_get_task_cmdline test case Date: Tue, 18 Nov 2025 20:58:02 +0800 Message-ID: <20251118125802.385503-2-chen.dylane@linux.dev> In-Reply-To: <20251118125802.385503-1-chen.dylane@linux.dev> References: <20251118125802.385503-1-chen.dylane@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT Create a task, call bpf_get_task_cmdline to retrieve the cmdline, and check if it succeeds. Signed-off-by: Tao Chen --- tools/testing/selftests/bpf/prog_tests/task_kfunc.c | 11 +++++++++++ .../selftests/bpf/progs/task_kfunc_success.c | 13 +++++++++++++ 2 files changed, 24 insertions(+) diff --git a/tools/testing/selftests/bpf/prog_tests/task_kfunc.c b/tools/testing/selftests/bpf/prog_tests/task_kfunc.c index 83b90335967..c23c0be357d 100644 --- a/tools/testing/selftests/bpf/prog_tests/task_kfunc.c +++ b/tools/testing/selftests/bpf/prog_tests/task_kfunc.c @@ -156,6 +156,10 @@ static const char * const vpid_success_tests[] = { "test_task_from_vpid_invalid", }; +static const char * const cmdline_success_tests[] = { + "test_get_task_cmdline", +}; + void test_task_kfunc(void) { int i; @@ -174,5 +178,12 @@ void test_task_kfunc(void) run_vpid_success_test(vpid_success_tests[i]); } + for (i = 0; i < ARRAY_SIZE(cmdline_success_tests); i++) { + if (!test__start_subtest(cmdline_success_tests[i])) + continue; + + run_success_test(cmdline_success_tests[i]); + } + RUN_TESTS(task_kfunc_failure); } diff --git a/tools/testing/selftests/bpf/progs/task_kfunc_success.c b/tools/testing/selftests/bpf/progs/task_kfunc_success.c index 5fb4fc19d26..a7c42e693da 100644 --- a/tools/testing/selftests/bpf/progs/task_kfunc_success.c +++ b/tools/testing/selftests/bpf/progs/task_kfunc_success.c @@ -367,6 +367,19 @@ int BPF_PROG(task_kfunc_acquire_trusted_walked, struct task_struct *task, u64 cl return 0; } +SEC("lsm.s/task_alloc") +int BPF_PROG(test_get_task_cmdline, struct task_struct *task) +{ + char buf[64]; + int ret; + + ret = bpf_get_task_cmdline(task, buf, sizeof(buf)); + if (ret < 0) + err = 1; + + return 0; +} + SEC("syscall") int test_task_from_vpid_current(const void *ctx) { -- 2.48.1