From patchwork Tue May 20 13:01:18 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenz Bauer X-Patchwork-Id: 891413 Received: from mail-wm1-f42.google.com (mail-wm1-f42.google.com [209.85.128.42]) (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 78CF622C35D for ; Tue, 20 May 2025 13:01:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.42 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747746105; cv=none; b=ZjP/QaA2sF1ssiq3xVWLhzE9O53MaUpq+oEh1QWP+wErIInLfMSUpwkMp1TveTb1RG96XLBl5d7XggVSQxsamOFsLkEbh0TJaJqClj9E/YYeglFL7/j1e8gongTMkdccB3TZwRh47+kw7W65VJoLMibJc0YgZm5IsWkjxKdIrBw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747746105; c=relaxed/simple; bh=onxYhud+KbP9G92KrrkVXhWhrAZjMw6PhcWJrcxgw9g=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=AIELKuDzDHOGYy8MmbitQeJMRUbnbJYCbVdi3bFFlc0Z0v5fTQHGFenluK4TWDAtq1fC+AZNgWvABTnsKrFBBOdGbOVAF5H6Z7mGtaYC4WrI75obkiKXUWJPHkwXCgLKIPuQ7GicLnIIvcEAwqyJc5x8oEQ1AEYlCra52k6MR6w= 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=WdcEY+pt; arc=none smtp.client-ip=209.85.128.42 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="WdcEY+pt" Received: by mail-wm1-f42.google.com with SMTP id 5b1f17b1804b1-442f4a3a4d6so36220685e9.0 for ; Tue, 20 May 2025 06:01:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=isovalent.com; s=google; t=1747746102; x=1748350902; 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=OLk5G4Cel/wWxbE0AJcynDwZLLJtlvvXRoNS6jKTq6M=; b=WdcEY+pt4w0MfM0DuCLDEk0pdk8ZtsWlU+dYfUHpPY0R64urNJ+Jn+4izTxIb9V8D1 6WSc47jK1IzN4+S5pFL2nlXaIaje39BYGKZygYPXo+hJiKJOUpdKcolX9FB0D1SuWcig KG6Vn6N3wSSXj/IfhXiQFloqx8VSqzxiLsqi8mXNojtgU0lDahICt/+tXzlexKysapR4 SQRMRupfrKoepgAo8w2VFSOqlFeLzmFCZKdtSdceqcuaUEnarwi3I56Qw4Ob0qKYCS4j /AC0tNJVJI0DVGDdgwewiX1nU59j1p1qxieokBPx1Kfb2h+dF9DG6Af3J/F54tAxtvFa a/cw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1747746102; x=1748350902; 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=OLk5G4Cel/wWxbE0AJcynDwZLLJtlvvXRoNS6jKTq6M=; b=s33WlN7eeO5ZiUEmYqxa/wdN7G0VrXnDJq5GyFBltHTlqcBFEoPPAo6/m0384lb8TG JHFjJMjSQmv6/g5uvWPUpY2o+Vyeh15HIJeRKp1xG9Qg5geiZtc8OgkFGwkzX1w5EZus kUUVGGhg1bm5r8CR1xb5nWASV/Ld+4eJDgk5v4gHlnGRgb1F5ZG1UXBa1jv4I3cq6uL/ tKo990paQn+GAyY1XnENLhB8YJ743sQAfXmJRPqavRQqpqsSeLVLLZjfuAeINAWPefID Y17AB/MKpZxlJRWnI9ZV96xHewn4LI/WhmiO6mDWgleweWoh/SFP4O5E/K/G/er3oQ0b ZKLg== X-Forwarded-Encrypted: i=1; AJvYcCXuUuvIwoUEq0o/Xh/gIEdBMoBlgeBE9iKiG6FmiegZRIE0ipvwniCri7gIroEAU5ot7KilxPlKsS+JZ6Qs42Y=@vger.kernel.org X-Gm-Message-State: AOJu0YyGTpwC8yUguzJIUHZtwJaDsSaIQmzVqMowI/B3Pb9YnmSx+6UN IAL/ojNmGZg4BPSwZLabnv+YOLbpAESVDMb+l2D8SGGoX9klsOzDo0IXLOYSV4F9Ihg= X-Gm-Gg: ASbGncvd6tAUeBRJCRJT2gS1NDfu/1zFEYTM/rWTSA59xiAH/asGVWQe1y5tUiaZJ4d M+GBcm9p8npb0hwi9XWo0oqIH1TzZogsJnfho9J7xaJpaRAmF4vN/wGEi8r0Tjh6bB4nxg+rNXA +sclgjOH04BQGz+76MrfvfXEfSZVNxYINQBUvn6m/F6C9n81n6VX0fW52v2wPEio0kgBhbcd0rv rddpOuqiK6lS2rFA2NStJjPfde8Nqg/8B3+5DrAL6WXBXpnwYZyzGTehT8SavASMt+EI8yJQFzZ ZLm/GwWZ6Sq43B6QeyAHDDM2yugCvp5R9HN9JMYkqSn1AaGMPP5pERsgtuxI//8gXfHwrI/vttZ kvpit5EBuGOmyPq8JZ16YgHDUlxFPUZCn6zSeTLsOQacL3is= X-Google-Smtp-Source: AGHT+IF+zmD+H27RSz/G+4dMOqhg+dz+ihe+221W/uu8LbDrI30vQwAeUCggEu1LDpdjLTvtZ+WKVw== X-Received: by 2002:a05:600c:5295:b0:43c:f3e1:a729 with SMTP id 5b1f17b1804b1-442f8514e9emr189410795e9.12.1747746101310; Tue, 20 May 2025 06:01:41 -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-3a35ca5a8cfsm16538095f8f.37.2025.05.20.06.01.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 20 May 2025 06:01:40 -0700 (PDT) From: Lorenz Bauer Date: Tue, 20 May 2025 14:01:18 +0100 Subject: [PATCH bpf-next v5 2/3] selftests: bpf: add a test for mmapable vmlinux BTF Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20250520-vmlinux-mmap-v5-2-e8c941acc414@isovalent.com> References: <20250520-vmlinux-mmap-v5-0-e8c941acc414@isovalent.com> In-Reply-To: <20250520-vmlinux-mmap-v5-0-e8c941acc414@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 , Alan Maguire 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. Tested-by: Alan Maguire 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/testing/selftests/bpf/prog_tests/btf_sysfs.c new file mode 100644 index 0000000000000000000000000000000000000000..3923e64c4c1d0f1dfeef2a39c7bbab7c9a19f0ca --- /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 = NULL; + int fd = -1; + long page_size; + struct btf *btf = NULL; + + page_size = 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 = st.st_size; + end = (btf_size + page_size - 1) / page_size * page_size; + + fd = open(path, O_RDONLY); + if (!ASSERT_GE(fd, 0, "open_btf")) + goto cleanup; + + raw_data = 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 = mmap(NULL, btf_size, PROT_READ, MAP_SHARED, fd, 0); + if (!ASSERT_EQ(raw_data, MAP_FAILED, "mmap_btf_shared")) + goto cleanup; + + raw_data = 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 = 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 = btf_size; i < end; i++) { + if (((__u8 *)raw_data)[i] != 0) { + PRINT_FAIL("tail of BTF is not zero at page offset %d\n", i); + goto cleanup; + } + } + + btf = 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 != MAP_FAILED) + munmap(raw_data, btf_size); + if (fd >= 0) + close(fd); +} + +void test_btf_sysfs(void) +{ + test_btf_mmap_sysfs("/sys/kernel/btf/vmlinux", NULL); +}