From nobody Tue Dec 16 14:50:56 2025 Received: from mail-wr1-f49.google.com (mail-wr1-f49.google.com [209.85.221.49]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3835726F450 for ; Mon, 5 May 2025 18:39:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.221.49 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746470386; cv=none; b=PR648WjE31SVtY/pXb7/aUy+F0x6DXuPk4faJJgYyT9Du33e5r0XBQQ218pOc0WKW7K9aXkBKGfuqDQSGp38v7tKzml9curmy0AeKJFs8u1c0MNvh6Kv0ZaDLTXuWJgMSEXkOKdtcgOvJz+268pYbZvibK+40fEnw2uWy/6HGIE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746470386; c=relaxed/simple; bh=CztS+KUwtw99mOFMGWop7TTlPlQPx0Dh4oY50Ajoq88=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=beGGBMOcylZdUG0ZOfCLyPwLToYAXO9tm4pqN4GW9QORmw3mvsD2Z9bWCdyB1RhIY7gckZEL9zYh/HRu2JFBeWNCTBlTESrAkkFl51CUkEXDP7uBQSHmYqGQft9WD7FMHbnpt4UTysVHusa3Qbm9ibpPXYcq5U5FQojP5So3bQQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=isovalent.com; spf=pass smtp.mailfrom=isovalent.com; dkim=pass (2048-bit key) header.d=isovalent.com header.i=@isovalent.com header.b=iiTwDxYY; arc=none smtp.client-ip=209.85.221.49 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=isovalent.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=isovalent.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=isovalent.com header.i=@isovalent.com header.b="iiTwDxYY" Received: by mail-wr1-f49.google.com with SMTP id ffacd0b85a97d-39c266c2dd5so5717975f8f.3 for ; Mon, 05 May 2025 11:39:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isovalent.com; s=google; t=1746470381; x=1747075181; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=OzNe6C0edsjyIWPceeV4C4p+25KcQZ/7bKBRPqQnHyY=; b=iiTwDxYY4ymP7BQOSu5mxaqnasgJaQdF3cqryvZ/dRTGG5nDgk6AAEgZ1FHEbw46J6 HicIP7thkUanFXMxBkFdMajvwBFtV5+0PY5QEAMw3q6ELKBoKj1hqSfWsVYY4pRRJ4ga dIRv/n0TP0YTJfDJN6CglfVNLO9Z53H60+o5hQE0UiIoOHlMrGwsF5qOdsBRS0HpXEgt vb5LRK+3+Iak5+t3Rz576OdRUfvqao2SRbqwDot0x6mzS0bx+AjVeHcA6Me6DEF5iquA K4io8QAaGH1TljgXNermtvZVbcmFBzagwN3AuwPhowHlU7Z80A4DyPv1swdyuT341r9n 7X9g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1746470381; x=1747075181; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=OzNe6C0edsjyIWPceeV4C4p+25KcQZ/7bKBRPqQnHyY=; b=k0V+/jBmrGBIramXNq23fEUdX3ZjiDQU4M9Cben1LR5NtEmL/cx006iwWUad8CfIJN wlHl5A1MqiDlDZlnaeLwph2+CjSxfJrXOtDJu4KF9GK6ttjLiR7CbI/WgO30sfgmTpBP /HotOOfpbSbpGGXG+LB7dILULNDJc21Lt4ZJEswzKGEDU7itjZWCTovF4B+Qv3Zoa14R HIDgwi/T93HdFypbyTj9H0TzFQBFkL7fx26G8f/He5nTshW6oXf1c6HaCAGsupub8MeM YV7C8Zqs7qu08t49cCnZFCdAppArHg+K+QIZbVwJ2NEfPWybCq0RvyoQR5xRnJ2ZISPd WvMQ== X-Forwarded-Encrypted: i=1; AJvYcCX0o0tr12Rmyxe054INr2UemIZOCxSZ4o9ZQ+lvnU3L1i9judgSDkVemc8IEd4P1BHWztu+Dr6en3nT4qo=@vger.kernel.org X-Gm-Message-State: AOJu0Yzc15M1BuAHqsQX5ug7Nokxyr/uEOTjvx0d4G+A+FMmxo/kGKwN xAnVhfcGlKUxxKxWPGtQg/0kKMz1i52J6XWx/meFtd/RWKl9fz3kai5oBOCcAb4= X-Gm-Gg: ASbGncsq6idj8lCLdwKWOzCvuImOzrSPJduLPdffvn7mYvilQh67WD+Ibm/OufU1z6m Z7IvHmbcCu+p6XJT7wKfv9Acj2fLGaBPE2QLuglWuCwX1FNZAUaduUSfYawAkHKV5y5CyIxeyPp R0dglLVz/fPPO7/jrti5/08RkCfI5DI1ByvofsuCIv9SqBw5d/E2lxSY6xYwbCLy/B05THA95/h RQ5ySPxDEbgfMGAhVUFB2K9WIFFJGhmne9unojimiNwa/7XAtwWFF7WwF8wTma4y3iX+4wisOP5 f+xijSMqkM4R+38wLUKWOK4AoY8Aj/dH9uf6AiSsrsrQMqCmeGX4kAHf0PW76dNEQoSgoyMClVd 91Hw7NqwQIvcuLt/GuwYVe4eeGp9GUrT7sDbJ X-Google-Smtp-Source: AGHT+IGwUA9SurKLxWLh45mHH6adoDU7MQ2Biah9osWdbgtkUBvKKSZQdOCU6OvgAcD3Wg09VVAOEA== X-Received: by 2002:a05:6000:18ae:b0:3a0:aa06:1d8d with SMTP id ffacd0b85a97d-3a0aa061dafmr1084271f8f.46.1746470381511; Mon, 05 May 2025 11:39:41 -0700 (PDT) Received: from [192.168.1.240] (0.0.6.0.0.0.0.0.0.0.0.0.0.0.0.0.f.f.6.2.a.5.a.7.0.b.8.0.1.0.0.2.ip6.arpa. [2001:8b0:7a5a:26ff::600]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a099ae8117sm11328877f8f.56.2025.05.05.11.39.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 05 May 2025 11:39:41 -0700 (PDT) From: Lorenz Bauer Date: Mon, 05 May 2025 19:38:44 +0100 Subject: [PATCH bpf-next v3 2/3] selftests: bpf: add a test for mmapable vmlinux BTF Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250505-vmlinux-mmap-v3-2-5d53afa060e8@isovalent.com> References: <20250505-vmlinux-mmap-v3-0-5d53afa060e8@isovalent.com> In-Reply-To: <20250505-vmlinux-mmap-v3-0-5d53afa060e8@isovalent.com> To: Arnd Bergmann , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Mykola Lysenko , Shuah Khan Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, Lorenz Bauer X-Mailer: b4 0.14.2 Add a basic test for the ability to mmap /sys/kernel/btf/vmlinux. Since libbpf doesn't have an API to parse BTF from memory we do some basic sanity checks ourselves. Signed-off-by: Lorenz Bauer --- tools/testing/selftests/bpf/prog_tests/btf_sysfs.c | 83 ++++++++++++++++++= ++++ 1 file changed, 83 insertions(+) diff --git a/tools/testing/selftests/bpf/prog_tests/btf_sysfs.c b/tools/tes= ting/selftests/bpf/prog_tests/btf_sysfs.c new file mode 100644 index 0000000000000000000000000000000000000000..3319cf758897d46cefa8ca25e16= acb162f4e9889 --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/btf_sysfs.c @@ -0,0 +1,83 @@ +// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause +/* Copyright (c) 2025 Isovalent */ + +#include +#include +#include +#include +#include +#include + +static void test_btf_mmap_sysfs(const char *path, struct btf *base) +{ + struct stat st; + __u64 btf_size, end; + void *raw_data =3D NULL; + int fd =3D -1; + long page_size; + struct btf *btf =3D NULL; + + page_size =3D sysconf(_SC_PAGESIZE); + if (!ASSERT_GE(page_size, 0, "get_page_size")) + goto cleanup; + + if (!ASSERT_OK(stat(path, &st), "stat_btf")) + goto cleanup; + + btf_size =3D st.st_size; + end =3D (btf_size + page_size - 1) / page_size * page_size; + + fd =3D open(path, O_RDONLY); + if (!ASSERT_GE(fd, 0, "open_btf")) + goto cleanup; + + raw_data =3D mmap(NULL, btf_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd= , 0); + if (!ASSERT_EQ(raw_data, MAP_FAILED, "mmap_btf_writable")) + goto cleanup; + + raw_data =3D mmap(NULL, btf_size, PROT_READ, MAP_SHARED, fd, 0); + if (!ASSERT_EQ(raw_data, MAP_FAILED, "mmap_btf_shared")) + goto cleanup; + + raw_data =3D mmap(NULL, end + 1, PROT_READ, MAP_PRIVATE, fd, 0); + if (!ASSERT_EQ(raw_data, MAP_FAILED, "mmap_btf_invalid_size")) + goto cleanup; + + raw_data =3D mmap(NULL, end, PROT_READ, MAP_PRIVATE, fd, 0); + if (!ASSERT_NEQ(raw_data, MAP_FAILED, "mmap_btf")) + goto cleanup; + + if (!ASSERT_EQ(mprotect(raw_data, btf_size, PROT_READ | PROT_WRITE), -1, + "mprotect_writable")) + goto cleanup; + + if (!ASSERT_EQ(mprotect(raw_data, btf_size, PROT_READ | PROT_EXEC), -1, + "mprotect_executable")) + goto cleanup; + + /* Check padding is zeroed */ + for (int i =3D btf_size; i < end; i++) { + if (((__u8 *)raw_data)[i] !=3D 0) { + PRINT_FAIL("tail of BTF is not zero at page offset %d\n", i); + goto cleanup; + } + } + + btf =3D btf__new_split(raw_data, btf_size, base); + if (!ASSERT_NEQ(btf, NULL, "parse_btf")) + goto cleanup; + +cleanup: + if (raw_data && raw_data !=3D MAP_FAILED) + munmap(raw_data, btf_size); + if (btf) + btf__free(btf); + if (fd >=3D 0) + close(fd); +} + +void test_btf_sysfs(void) +{ + if (test__start_subtest("vmlinux")) + test_btf_mmap_sysfs("/sys/kernel/btf/vmlinux", NULL); +} --=20 2.49.0