From patchwork Tue Jun 25 12:24:01 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dev Jain X-Patchwork-Id: 13711039 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 26ED6C30653 for ; Tue, 25 Jun 2024 12:25:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=i/1wbSYnEoJwvWAXBYTkAoUD7Q06YbEUmyiRlK7QdmA=; b=KHii6PyEDY/v3S5hiK1UV+nezk RaiiX52r/87DkqGEoFq6b4Mwuy9NJkfl3zdYH6G+Ry1FFzaZO8JWVAiHAHKBWJro9hhWh6jYLHJ8R /sXiLe/hp24VBg3Vzv92mwjru1hkUxsEjFDN6kkDo9VlEf9QV1tUUmTzLd37HEQCNlIvj9nE3lW7f Gh/gLoFaC4az7JFWARHiu4KdeOlO+ZAH7N5Usxy9hsPcHSiu5pYumFpO+qQQOwD+F5A5qIkQhGbcB O2mIlr/oQ63RlAjZHMmMC47e4OzPrSjoQ22H5LJi8QdNAZS3rpikj4hXiGhmERysVjNnB5r5GUI3W kOijKmAQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sM5Ei-00000002jt8-38nu; Tue, 25 Jun 2024 12:25:24 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sM5E4-00000002jUL-3gMx for linux-arm-kernel@lists.infradead.org; Tue, 25 Jun 2024 12:24:46 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 1F259339; Tue, 25 Jun 2024 05:25:08 -0700 (PDT) Received: from e116581.blr.arm.com (e116581.arm.com [10.162.41.12]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 370573F766; Tue, 25 Jun 2024 05:24:37 -0700 (PDT) From: Dev Jain To: shuah@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kselftest@vger.kernel.org, Catalin.Marinas@arm.com, will@kernel.org Cc: broonie@kernel.org, ryan.roberts@arm.com, rob.herring@arm.com, mark.rutland@arm.com, linux@armlinux.org.uk, suzuki.poulose@arm.com, Anshuman.Khandual@arm.com, aneesh.kumar@kernel.org, linux-kernel@vger.kernel.org, Dev Jain Subject: [PATCH v3 2/9] selftests/arm: Add elf test Date: Tue, 25 Jun 2024 17:54:01 +0530 Message-Id: <20240625122408.1439097-3-dev.jain@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240625122408.1439097-1-dev.jain@arm.com> References: <20240625122408.1439097-1-dev.jain@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240625_052444_990267_58E1FDC4 X-CRM114-Status: GOOD ( 13.84 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org This patch introduces an ELF parsing test. A basic sanity check is required to ensure that we are actually testing a 32-bit build. Signed-off-by: Dev Jain --- v2->v3: - Introduce two more testcases tools/testing/selftests/arm/elf/parse_elf.c | 77 +++++++++++++++++++++ 1 file changed, 77 insertions(+) create mode 100644 tools/testing/selftests/arm/elf/parse_elf.c diff --git a/tools/testing/selftests/arm/elf/parse_elf.c b/tools/testing/selftests/arm/elf/parse_elf.c new file mode 100644 index 000000000000..6eb8fb91f6a7 --- /dev/null +++ b/tools/testing/selftests/arm/elf/parse_elf.c @@ -0,0 +1,77 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2024 ARM Limited + * + * Author : Dev Jain + * + * Parse elf header to confirm 32-bit process + */ + +#define _GNU_SOURCE +#include +#include +#include +#include +#include + +#include + +/* The ELF file header. This appears at the start of every ELF file. */ + +struct elf_header { + unsigned char e_ident[16]; /* Magic number and other info */ + uint16_t e_type; /* Object file type */ + uint16_t e_machine; /* Architecture */ + uint32_t e_version; /* Object file version */ + uint32_t e_entry; /* Entry point virtual address */ + uint32_t e_phoff; /* Program header table file offset */ + uint32_t e_shoff; /* Section header table file offset */ + uint32_t e_flags; /* Processor-specific flags */ + uint16_t e_ehsize; /* ELF header size in bytes */ + uint16_t e_phentsize; /* Program header table entry size */ + uint16_t e_phnum; /* Program header table entry count */ + uint16_t e_shentsize; /* Section header table entry size */ + uint16_t e_shnum; /* Section header table entry count */ + uint16_t e_shstrndx; /* Section header string table index */ +}; + +#define ELFCLASS32 1 +#define EM_ARM 40 + +void read_elf_header(const char *elfFile) +{ + struct elf_header header; + FILE *file; + int ret; + + file = fopen(elfFile, "r"); + if (!file) + ksft_exit_fail_perror("/proc/self/exe"); + + /* store header in struct */ + if (fread(&header, 1, sizeof(header), file) != sizeof(header)) + ksft_exit_fail_perror("fread"); + + if (fclose(file)) + ksft_exit_fail_perror("fclose"); + + /* sanity check: does it really follow ELF format */ + ret = (header.e_ident[0] == 0x7f && header.e_ident[1] == 'E' + && header.e_ident[2] == 'L' && header.e_ident[3] == 'F'); + + ksft_test_result(ret == 1, "Follows ELF format\n"); + + ksft_test_result(header.e_ident[4] == ELFCLASS32, "ELF is 32 bit\n"); + + ksft_test_result(header.e_machine == EM_ARM, "Machine type\n"); +} + +int main(int argc, char *argv[]) +{ + ksft_print_header(); + ksft_set_plan(3); + + read_elf_header("/proc/self/exe"); + + ksft_finished(); +}