From patchwork Fri Apr 5 08:44:09 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dev Jain X-Patchwork-Id: 13618807 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 52A61C67861 for ; Fri, 5 Apr 2024 10:05:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=ni/74lfbujX1wF+S07c9G/R/jEMmCqP5Jejfwa2TOiQ=; b=ZBTSbDm2Ag7p+8 /1BoLPnmzrHixwAjxZvWuRrCNPiNWFnNifuxBw+r8CavIBLwEAvmMC2bCzPlToOQhg05qdkVmQSdz WCuF7DRzWyWlUKYs9cZFFs7V/cbAncI2YVtmJxPNtxurrswy8z4rDVBlrVyxhJWZKCQRP6C2LFL9V NA1t6nHZeDpacgzVmuNvl8iIjzjUYI/HkJL7/YYa5WPyV3N9KppsY1cOaILk1hSYs3H4yqZcASwmC Le5B9gkQ2o/0nzjoW/Y5QL0mEJTDOdb17ZyBzGW8ziJwB55i0d6OR2g9b1fIyyDeVggQCkR6GDVnN ChGxo+/dpyQa8Gf+SUqg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rsgRJ-00000006Klt-3SmX; Fri, 05 Apr 2024 10:04:53 +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 1rsfGr-000000061K0-2b1d for linux-arm-kernel@lists.infradead.org; Fri, 05 Apr 2024 08:50:03 +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 C73FFFEC; Fri, 5 Apr 2024 01:50:31 -0700 (PDT) Received: from e116581.blr.arm.com (e116581.arm.com [10.162.43.7]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id BF8443F64C; Fri, 5 Apr 2024 01:49:56 -0700 (PDT) From: Dev Jain To: shuah@kernel.org, linux-arm-kernel@lists.infradead.org Cc: linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Anshuman.Khandual@arm.com, suzuki.poulose@arm.com, ryan.roberts@arm.com, rob.herring@arm.com, Catalin.Marinas@arm.com, broonie@kernel.org, will@kernel.org, mark.rutland@arm.com, Dev Jain Subject: [PATCH 3/4] selftests/arm: Add elf test Date: Fri, 5 Apr 2024 14:14:09 +0530 Message-Id: <20240405084410.256788-4-dev.jain@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240405084410.256788-1-dev.jain@arm.com> References: <20240405084410.256788-1-dev.jain@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240405_015001_726434_7F754B70 X-CRM114-Status: GOOD ( 14.95 ) 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; the 5th byte of the ELF header must be 0x01 for a 32-bit process. A basic sanity check is required to ensure that we are actually testing a 32-bit build. Signed-off-by: Dev Jain --- tools/testing/selftests/arm/elf/parse_elf.c | 75 +++++++++++++++++++++ 1 file changed, 75 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..decd65699858 --- /dev/null +++ b/tools/testing/selftests/arm/elf/parse_elf.c @@ -0,0 +1,75 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * 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 */ + uint64_t e_entry; /* Entry point virtual address */ + uint64_t e_phoff; /* Program header table file offset */ + uint64_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 */ +}; + +static int read_elf_header(const char *elfFile) +{ + struct elf_header header; + FILE *file; + + file = fopen(elfFile, "r"); + if (file) { + + /* store header in struct */ + fread(&header, 1, sizeof(header), file); + fclose(file); + + /* sanity check: does it really follow ELF format */ + if (header.e_ident[0] == 0x7f && + header.e_ident[1] == 'E' && + header.e_ident[2] == 'L' && + header.e_ident[3] == 'F') { + if (header.e_ident[4] == 0x01) + return 0; + return 1; + } + ksft_exit_fail_msg("Cannot parse /proc/self/exe\n"); + } + ksft_exit_fail_msg("Cannot open /proc/self/exe\n"); + exit(EXIT_FAILURE); +} + +int main(int argc, char *argv[]) +{ + const char *file_name; + + ksft_print_header(); + ksft_set_plan(1); + + file_name = "/proc/self/exe"; + ksft_test_result(read_elf_header(file_name) == 0, "ELF is 32 bit\n"); + ksft_finished(); +}