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: 13711020 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id C84DF1553AF; Tue, 25 Jun 2024 12:24:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719318285; cv=none; b=EO8nWxkfE6sLvDwRvuvDvla/rWwI4Gg967YIKX0C8Wk6ljLUmcsVoe+rJQCo29ww2CEWF+MgWjQhsz+eo0SbC8MjU4e+G/6cSRFGcYOLAJCNbf2ZKX9dv1gPwzWPyAOWV1gt2DeAGpmY+3kqRHgBF6Hp/+rKsMH9mIiMrJ56pcs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719318285; c=relaxed/simple; bh=1PSrTGcZOk8NrG6nmdRKoCA3QkgwzXuWtNM9SyFayRI=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=fknvmXIR0SjResHu9Qps1ROsVZxdFfdO/houUMQUu+fV42IpUUpHvtrp5YXRraza19SPrAKqV0BAgR3L2CMbhgW33aT2uRN/jmKR84qGff4The9EdIXjHSGk3aqavSbWnK+jdVqj54K156wA8VgSYkc73ntLErmXWvfCTNGn7Z4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com 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> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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(); +}