From nobody Mon Feb 9 02:12:00 2026 Received: from mail-qv1-f48.google.com (mail-qv1-f48.google.com [209.85.219.48]) (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 B9C72257AF1 for ; Sat, 10 May 2025 12:35:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.219.48 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746880516; cv=none; b=I1YvycbX0rfxn/omECXZhOD+urze9R6xoN4tx89t3iaNIqI5yEwA5n5OVc7zKKy3SoXsMhZTdY5nG9SQ9R4clKEUJPoZx27mhZm9MDmjzD8cJktJNC/sxUNrccAoJr8UpbvEAWe+C+U5X/tqm7OBWZ70d+B5nG/PDGKCvkKmMSM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746880516; c=relaxed/simple; bh=E4dMNNnVTsxU67yMkTyvHQT6LvBD9dD3EKDdUb1spL8=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=c+gFGAWfhDHwgH5CR9s9EmQXup0xhEncmdkQv5U6g7Anr+xHgojNMKophPBFbnkYGXNpsyNbLsKmH3VVmnYqQOHnawQKERwp+Eg0Ol6AV3aiNDUOYBER8VxjHRCAKzvVp+3ih8q8m/5onAsMNqo93cKRMq6Q7v2BtD8UnuAQojw= 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=S7dgPmSn; arc=none smtp.client-ip=209.85.219.48 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="S7dgPmSn" Received: by mail-qv1-f48.google.com with SMTP id 6a1803df08f44-6f545ae3c59so32586996d6.1 for ; Sat, 10 May 2025 05:35:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isovalent.com; s=google; t=1746880513; x=1747485313; 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=ZSmxBWoHOESSY60Jb4jCFImphntRhbF/jzT+yOUkKiI=; b=S7dgPmSnNNazETW6TQjbweZPw/gNgFpOkAaREbKCCl9UKZNMknX5A93rt4Xa59Anzu JFdQ5YLxWIcyagD5i+9hvaS6oYCDJeL94I99I1DmSPabvMcsBRd6Mb6fTT+hr1DC9bvQ DFWX3ZlICC01a+kRz6txaACNZUyDhybQcBmsgpUQpMRnkRDReMYbzsTH1njfpJAMsfhp idR2fnjcq5407bUJLLZZUYQj7lyn+CX72U81vJboGS2W2qnCPLzxOyB52rImaBL6TgzP lc0zj3I05BP6nQglv8pmq9UTJlIPE/c+qCtHeKSX6XqAonIwG9XzOazafuadXywnJrxa BVmA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1746880513; x=1747485313; 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=ZSmxBWoHOESSY60Jb4jCFImphntRhbF/jzT+yOUkKiI=; b=AY0PSdXNlKILVK5kT9b8rpE74OLJOt/u4VhJ6msNlhc3M0fRvaU7gKtz2TTt1lvy/K j/PIJ8xECHusyQTb7vm9c/B5TUH5p7NRkHiaZzQti8XvMGf2Du3+7HHkUVbq1/Bld1f+ vT0oVybRgkiwElSrecyW0c6P5wO1lsIRN0l8CkPAhOCjG1+eUHkcsYmLWSMwYOF8L/AB 2m6xhdALL5bhAaNWcdmOlBsVO9nsC+CfeV+h/OSoY4cMd/3wopMbfIo2XZNuVVTGcE1C iXQFkDWXXGke9TZcaAfuyRObEiZ4255Oh0FpVdx4nX4oRNoRmnKanjVNbqrXcGp686Y0 fKoQ== X-Forwarded-Encrypted: i=1; AJvYcCW4OQ3n+9cw5nH2iF1QPz9kEepg+rU0eQofdVQgJTR8Li6z4sPP2/E6YksZAwBt4FlzzTleIzbkK8QxljQ=@vger.kernel.org X-Gm-Message-State: AOJu0YwVJzeuv5+WI7n10OcFAfPQhaP6cyY/ehsgc2lZj8PFsZ0GQsgF 2kWeXpyQSodneVuW+7w2pFcMf0vMUz/0r+yubNdHP/ewDnTeHkBboQybNgHkmeo= X-Gm-Gg: ASbGncsdTOFDiswYU2EqhFThVGrG7s+APyL6tm25u+7ugRlj94ACxKae3YrQqA6FuUY 809Bf55e/lIo63oDQZFR4t5xqLKY65udUZY7Tk1bdN4NDx8WmO0RT7cUuv9Rv5Ym8bW2B/6u6Rs wxPL1c2pLk0osCjLL6iF+vqzE9KzpEItGJGLKuVT1XNosexn4EQhCX6bbP9KyRWFNLDuEi9n9pd 7SFbQ8arwqZLHAZrC74OtJIgrJ205h7FufhVLAxdhjr9I1EIo4CIFz4tgYHR1S6iT56Ub+NxbDd Rc7Rjsl8/GkUMTnjpdmkE6e4t5UchZLgxReprPuIGKdsTsDVSa1xovsElloy/JsaMAPIKOdZdK8 qNnyTnjI= X-Google-Smtp-Source: AGHT+IFDBOzsnKDQDmN5hEIHEOheS6MBFMmjcf/7s7AIHD7p09Y4avPfN2YUFnkpyoryFPv6mOLk+g== X-Received: by 2002:a0c:f68d:0:b0:6f5:401b:c985 with SMTP id 6a1803df08f44-6f6e4841d07mr76743466d6.42.1746880513549; Sat, 10 May 2025 05:35:13 -0700 (PDT) Received: from [192.168.1.45] (ool-182edad1.dyn.optonline.net. [24.46.218.209]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-6f6e39f588asm25725556d6.49.2025.05.10.05.35.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 10 May 2025 05:35:13 -0700 (PDT) From: Lorenz Bauer Date: Sat, 10 May 2025 08:34:55 -0400 Subject: [PATCH bpf-next v4 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: <20250510-vmlinux-mmap-v4-2-69e424b2a672@isovalent.com> References: <20250510-vmlinux-mmap-v4-0-69e424b2a672@isovalent.com> In-Reply-To: <20250510-vmlinux-mmap-v4-0-69e424b2a672@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. Ensure that the data is valid BTF and that it is padded with zero. Signed-off-by: Lorenz Bauer --- tools/testing/selftests/bpf/prog_tests/btf_sysfs.c | 81 ++++++++++++++++++= ++++ 1 file changed, 81 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..3923e64c4c1d0f1dfeef2a39c7b= bab7c9a19f0ca --- /dev/null +++ b/tools/testing/selftests/bpf/prog_tests/btf_sysfs.c @@ -0,0 +1,81 @@ +// 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_OK_PTR(raw_data, "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_OK_PTR(btf, "parse_btf")) + goto cleanup; + +cleanup: + btf__free(btf); + if (raw_data && raw_data !=3D MAP_FAILED) + munmap(raw_data, btf_size); + if (fd >=3D 0) + close(fd); +} + +void test_btf_sysfs(void) +{ + test_btf_mmap_sysfs("/sys/kernel/btf/vmlinux", NULL); +} --=20 2.49.0