On 4/5/24 1:44 PM, Dev Jain wrote:
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 dev.jain@arm.com
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 dev.jain@arm.com
- Parse elf header to confirm 32-bit process
- */
+#define _GNU_SOURCE +#include <stdio.h> +#include <unistd.h> +#include <stdlib.h> +#include <elf.h> +#include <stdint.h>
+#include <kselftest.h>
+/* 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);
Instead of failing and exiting multiple times here, use ksft_print_msg, return error or -1 from here and fail the test case in ksft_test_result().
+}
+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();
+}