767 lines
20 KiB
C
767 lines
20 KiB
C
/* elfedit.c -- Update the ELF header of an ELF format file
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Copyright (C) 2010-2015 Free Software Foundation, Inc.
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This file is part of GNU Binutils.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA
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02110-1301, USA. */
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#include "sysdep.h"
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#include <assert.h>
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#if __GNUC__ >= 2
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/* Define BFD64 here, even if our default architecture is 32 bit ELF
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as this will allow us to read in and parse 64bit and 32bit ELF files.
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Only do this if we believe that the compiler can support a 64 bit
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data type. For now we only rely on GCC being able to do this. */
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#define BFD64
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#endif
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#include "bfd.h"
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#include "elfcomm.h"
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#include "bucomm.h"
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#include "elf/common.h"
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#include "elf/external.h"
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#include "elf/internal.h"
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#include "getopt.h"
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#include "libiberty.h"
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#include "safe-ctype.h"
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#include "filenames.h"
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char * program_name = "elfedit";
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static long archive_file_offset;
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static unsigned long archive_file_size;
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static Elf_Internal_Ehdr elf_header;
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static Elf32_External_Ehdr ehdr32;
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static Elf64_External_Ehdr ehdr64;
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static int input_elf_machine = -1;
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static int output_elf_machine = -1;
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static int input_elf_type = -1;
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static int output_elf_type = -1;
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static int input_elf_osabi = -1;
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static int output_elf_osabi = -1;
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enum elfclass
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{
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ELF_CLASS_UNKNOWN = -1,
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ELF_CLASS_NONE = ELFCLASSNONE,
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ELF_CLASS_32 = ELFCLASS32,
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ELF_CLASS_64 = ELFCLASS64,
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ELF_CLASS_BOTH
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};
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static enum elfclass input_elf_class = ELF_CLASS_UNKNOWN;
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static enum elfclass output_elf_class = ELF_CLASS_BOTH;
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/* Return ELF class for a machine type, MACH. */
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static enum elfclass
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elf_class (int mach)
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{
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switch (mach)
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{
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case EM_386:
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case EM_IAMCU:
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return ELF_CLASS_32;
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case EM_L1OM:
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case EM_K1OM:
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return ELF_CLASS_64;
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case EM_X86_64:
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case EM_NONE:
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return ELF_CLASS_BOTH;
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default:
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return ELF_CLASS_BOTH;
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}
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}
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static int
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update_elf_header (const char *file_name, FILE *file)
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{
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int class, machine, type, status, osabi;
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if (elf_header.e_ident[EI_MAG0] != ELFMAG0
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|| elf_header.e_ident[EI_MAG1] != ELFMAG1
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|| elf_header.e_ident[EI_MAG2] != ELFMAG2
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|| elf_header.e_ident[EI_MAG3] != ELFMAG3)
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{
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error
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(_("%s: Not an ELF file - wrong magic bytes at the start\n"),
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file_name);
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return 0;
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}
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if (elf_header.e_ident[EI_VERSION] != EV_CURRENT)
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{
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error
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(_("%s: Unsupported EI_VERSION: %d is not %d\n"),
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file_name, elf_header.e_ident[EI_VERSION],
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EV_CURRENT);
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return 0;
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}
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/* Return if e_machine is the same as output_elf_machine. */
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if (output_elf_machine == elf_header.e_machine)
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return 1;
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class = elf_header.e_ident[EI_CLASS];
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machine = elf_header.e_machine;
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/* Skip if class doesn't match. */
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if (input_elf_class == ELF_CLASS_UNKNOWN)
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input_elf_class = elf_class (machine);
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if (input_elf_class != ELF_CLASS_BOTH
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&& (int) input_elf_class != class)
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{
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error
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(_("%s: Unmatched input EI_CLASS: %d is not %d\n"),
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file_name, class, input_elf_class);
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return 0;
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}
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if (output_elf_class != ELF_CLASS_BOTH
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&& (int) output_elf_class != class)
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{
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error
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(_("%s: Unmatched output EI_CLASS: %d is not %d\n"),
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file_name, class, output_elf_class);
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return 0;
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}
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/* Skip if e_machine doesn't match. */
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if (input_elf_machine != -1 && machine != input_elf_machine)
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{
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error
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(_("%s: Unmatched e_machine: %d is not %d\n"),
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file_name, machine, input_elf_machine);
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return 0;
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}
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type = elf_header.e_type;
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/* Skip if e_type doesn't match. */
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if (input_elf_type != -1 && type != input_elf_type)
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{
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error
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(_("%s: Unmatched e_type: %d is not %d\n"),
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file_name, type, input_elf_type);
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return 0;
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}
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osabi = elf_header.e_ident[EI_OSABI];
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/* Skip if OSABI doesn't match. */
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if (input_elf_osabi != -1 && osabi != input_elf_osabi)
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{
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error
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(_("%s: Unmatched EI_OSABI: %d is not %d\n"),
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file_name, osabi, input_elf_osabi);
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return 0;
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}
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/* Update e_machine, e_type and EI_OSABI. */
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switch (class)
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{
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default:
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/* We should never get here. */
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abort ();
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break;
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case ELFCLASS32:
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if (output_elf_machine != -1)
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BYTE_PUT (ehdr32.e_machine, output_elf_machine);
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if (output_elf_type != -1)
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BYTE_PUT (ehdr32.e_type, output_elf_type);
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if (output_elf_osabi != -1)
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ehdr32.e_ident[EI_OSABI] = output_elf_osabi;
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status = fwrite (&ehdr32, sizeof (ehdr32), 1, file) == 1;
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break;
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case ELFCLASS64:
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if (output_elf_machine != -1)
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BYTE_PUT (ehdr64.e_machine, output_elf_machine);
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if (output_elf_type != -1)
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BYTE_PUT (ehdr64.e_type, output_elf_type);
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if (output_elf_osabi != -1)
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ehdr64.e_ident[EI_OSABI] = output_elf_osabi;
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status = fwrite (&ehdr64, sizeof (ehdr64), 1, file) == 1;
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break;
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}
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if (status != 1)
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error (_("%s: Failed to update ELF header: %s\n"),
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file_name, strerror (errno));
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return status;
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}
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static int
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get_file_header (FILE * file)
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{
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/* Read in the identity array. */
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if (fread (elf_header.e_ident, EI_NIDENT, 1, file) != 1)
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return 0;
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/* Determine how to read the rest of the header. */
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switch (elf_header.e_ident[EI_DATA])
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{
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default: /* fall through */
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case ELFDATANONE: /* fall through */
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case ELFDATA2LSB:
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byte_get = byte_get_little_endian;
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byte_put = byte_put_little_endian;
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break;
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case ELFDATA2MSB:
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byte_get = byte_get_big_endian;
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byte_put = byte_put_big_endian;
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break;
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}
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/* Read in the rest of the header. For now we only support 32 bit
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and 64 bit ELF files. */
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switch (elf_header.e_ident[EI_CLASS])
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{
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default:
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error (_("Unsupported EI_CLASS: %d\n"),
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elf_header.e_ident[EI_CLASS]);
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return 0;
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case ELFCLASS32:
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if (fread (ehdr32.e_type, sizeof (ehdr32) - EI_NIDENT,
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1, file) != 1)
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return 0;
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elf_header.e_type = BYTE_GET (ehdr32.e_type);
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elf_header.e_machine = BYTE_GET (ehdr32.e_machine);
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elf_header.e_version = BYTE_GET (ehdr32.e_version);
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elf_header.e_entry = BYTE_GET (ehdr32.e_entry);
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elf_header.e_phoff = BYTE_GET (ehdr32.e_phoff);
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elf_header.e_shoff = BYTE_GET (ehdr32.e_shoff);
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elf_header.e_flags = BYTE_GET (ehdr32.e_flags);
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elf_header.e_ehsize = BYTE_GET (ehdr32.e_ehsize);
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elf_header.e_phentsize = BYTE_GET (ehdr32.e_phentsize);
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elf_header.e_phnum = BYTE_GET (ehdr32.e_phnum);
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elf_header.e_shentsize = BYTE_GET (ehdr32.e_shentsize);
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elf_header.e_shnum = BYTE_GET (ehdr32.e_shnum);
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elf_header.e_shstrndx = BYTE_GET (ehdr32.e_shstrndx);
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memcpy (&ehdr32, &elf_header, EI_NIDENT);
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break;
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case ELFCLASS64:
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/* If we have been compiled with sizeof (bfd_vma) == 4, then
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we will not be able to cope with the 64bit data found in
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64 ELF files. Detect this now and abort before we start
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overwriting things. */
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if (sizeof (bfd_vma) < 8)
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{
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error (_("This executable has been built without support for a\n\
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64 bit data type and so it cannot process 64 bit ELF files.\n"));
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return 0;
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}
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if (fread (ehdr64.e_type, sizeof (ehdr64) - EI_NIDENT,
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1, file) != 1)
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return 0;
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elf_header.e_type = BYTE_GET (ehdr64.e_type);
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elf_header.e_machine = BYTE_GET (ehdr64.e_machine);
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elf_header.e_version = BYTE_GET (ehdr64.e_version);
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elf_header.e_entry = BYTE_GET (ehdr64.e_entry);
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elf_header.e_phoff = BYTE_GET (ehdr64.e_phoff);
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elf_header.e_shoff = BYTE_GET (ehdr64.e_shoff);
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elf_header.e_flags = BYTE_GET (ehdr64.e_flags);
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elf_header.e_ehsize = BYTE_GET (ehdr64.e_ehsize);
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elf_header.e_phentsize = BYTE_GET (ehdr64.e_phentsize);
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elf_header.e_phnum = BYTE_GET (ehdr64.e_phnum);
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elf_header.e_shentsize = BYTE_GET (ehdr64.e_shentsize);
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elf_header.e_shnum = BYTE_GET (ehdr64.e_shnum);
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elf_header.e_shstrndx = BYTE_GET (ehdr64.e_shstrndx);
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memcpy (&ehdr64, &elf_header, EI_NIDENT);
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break;
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}
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return 1;
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}
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/* Process one ELF object file according to the command line options.
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This file may actually be stored in an archive. The file is
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positioned at the start of the ELF object. */
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static int
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process_object (const char *file_name, FILE *file)
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{
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/* Rememeber where we are. */
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long offset = ftell (file);
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if (! get_file_header (file))
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{
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error (_("%s: Failed to read ELF header\n"), file_name);
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return 1;
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}
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/* Go to the position of the ELF header. */
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if (fseek (file, offset, SEEK_SET) != 0)
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{
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error (_("%s: Failed to seek to ELF header\n"), file_name);
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}
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if (! update_elf_header (file_name, file))
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return 1;
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return 0;
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}
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/* Process an ELF archive.
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On entry the file is positioned just after the ARMAG string. */
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static int
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process_archive (const char * file_name, FILE * file,
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bfd_boolean is_thin_archive)
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{
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struct archive_info arch;
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struct archive_info nested_arch;
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size_t got;
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int ret;
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/* The ARCH structure is used to hold information about this archive. */
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arch.file_name = NULL;
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arch.file = NULL;
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arch.index_array = NULL;
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arch.sym_table = NULL;
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arch.longnames = NULL;
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/* The NESTED_ARCH structure is used as a single-item cache of information
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about a nested archive (when members of a thin archive reside within
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another regular archive file). */
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nested_arch.file_name = NULL;
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nested_arch.file = NULL;
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nested_arch.index_array = NULL;
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nested_arch.sym_table = NULL;
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nested_arch.longnames = NULL;
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if (setup_archive (&arch, file_name, file, is_thin_archive, FALSE) != 0)
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{
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ret = 1;
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goto out;
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}
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ret = 0;
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while (1)
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{
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char * name;
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size_t namelen;
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char * qualified_name;
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/* Read the next archive header. */
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if (fseek (file, arch.next_arhdr_offset, SEEK_SET) != 0)
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{
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error (_("%s: failed to seek to next archive header\n"),
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file_name);
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return 1;
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}
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got = fread (&arch.arhdr, 1, sizeof arch.arhdr, file);
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if (got != sizeof arch.arhdr)
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{
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if (got == 0)
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break;
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error (_("%s: failed to read archive header\n"),
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file_name);
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ret = 1;
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break;
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}
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if (memcmp (arch.arhdr.ar_fmag, ARFMAG, 2) != 0)
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{
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error (_("%s: did not find a valid archive header\n"),
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arch.file_name);
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ret = 1;
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break;
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}
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arch.next_arhdr_offset += sizeof arch.arhdr;
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archive_file_size = strtoul (arch.arhdr.ar_size, NULL, 10);
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if (archive_file_size & 01)
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++archive_file_size;
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name = get_archive_member_name (&arch, &nested_arch);
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if (name == NULL)
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{
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error (_("%s: bad archive file name\n"), file_name);
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ret = 1;
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break;
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}
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namelen = strlen (name);
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qualified_name = make_qualified_name (&arch, &nested_arch, name);
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if (qualified_name == NULL)
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{
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error (_("%s: bad archive file name\n"), file_name);
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ret = 1;
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break;
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}
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if (is_thin_archive && arch.nested_member_origin == 0)
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{
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/* This is a proxy for an external member of a thin archive. */
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FILE *member_file;
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char *member_file_name = adjust_relative_path (file_name,
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name, namelen);
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if (member_file_name == NULL)
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{
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ret = 1;
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break;
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}
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member_file = fopen (member_file_name, "r+b");
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if (member_file == NULL)
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{
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error (_("Input file '%s' is not readable\n"),
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member_file_name);
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free (member_file_name);
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ret = 1;
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break;
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}
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archive_file_offset = arch.nested_member_origin;
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ret |= process_object (qualified_name, member_file);
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fclose (member_file);
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free (member_file_name);
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}
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else if (is_thin_archive)
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{
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/* This is a proxy for a member of a nested archive. */
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archive_file_offset = arch.nested_member_origin + sizeof arch.arhdr;
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/* The nested archive file will have been opened and setup by
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get_archive_member_name. */
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if (fseek (nested_arch.file, archive_file_offset,
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SEEK_SET) != 0)
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{
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error (_("%s: failed to seek to archive member\n"),
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nested_arch.file_name);
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ret = 1;
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break;
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}
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ret |= process_object (qualified_name, nested_arch.file);
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}
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else
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{
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archive_file_offset = arch.next_arhdr_offset;
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arch.next_arhdr_offset += archive_file_size;
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ret |= process_object (qualified_name, file);
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}
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free (qualified_name);
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}
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out:
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if (nested_arch.file != NULL)
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fclose (nested_arch.file);
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release_archive (&nested_arch);
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release_archive (&arch);
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return ret;
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}
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static int
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check_file (const char *file_name, struct stat *statbuf_p)
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{
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struct stat statbuf;
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if (statbuf_p == NULL)
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statbuf_p = &statbuf;
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if (stat (file_name, statbuf_p) < 0)
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{
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if (errno == ENOENT)
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error (_("'%s': No such file\n"), file_name);
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else
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error (_("Could not locate '%s'. System error message: %s\n"),
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file_name, strerror (errno));
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return 1;
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}
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if (! S_ISREG (statbuf_p->st_mode))
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{
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error (_("'%s' is not an ordinary file\n"), file_name);
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return 1;
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}
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return 0;
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}
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static int
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process_file (const char *file_name)
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{
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FILE * file;
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char armag[SARMAG];
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int ret;
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if (check_file (file_name, NULL))
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return 1;
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|
||
file = fopen (file_name, "r+b");
|
||
if (file == NULL)
|
||
{
|
||
error (_("Input file '%s' is not readable\n"), file_name);
|
||
return 1;
|
||
}
|
||
|
||
if (fread (armag, SARMAG, 1, file) != 1)
|
||
{
|
||
error (_("%s: Failed to read file's magic number\n"),
|
||
file_name);
|
||
fclose (file);
|
||
return 1;
|
||
}
|
||
|
||
if (memcmp (armag, ARMAG, SARMAG) == 0)
|
||
ret = process_archive (file_name, file, FALSE);
|
||
else if (memcmp (armag, ARMAGT, SARMAG) == 0)
|
||
ret = process_archive (file_name, file, TRUE);
|
||
else
|
||
{
|
||
rewind (file);
|
||
archive_file_size = archive_file_offset = 0;
|
||
ret = process_object (file_name, file);
|
||
}
|
||
|
||
fclose (file);
|
||
|
||
return ret;
|
||
}
|
||
|
||
static const struct
|
||
{
|
||
int osabi;
|
||
const char *name;
|
||
}
|
||
osabis[] =
|
||
{
|
||
{ ELFOSABI_NONE, "none" },
|
||
{ ELFOSABI_HPUX, "HPUX" },
|
||
{ ELFOSABI_NETBSD, "NetBSD" },
|
||
{ ELFOSABI_GNU, "GNU" },
|
||
{ ELFOSABI_GNU, "Linux" },
|
||
{ ELFOSABI_SOLARIS, "Solaris" },
|
||
{ ELFOSABI_AIX, "AIX" },
|
||
{ ELFOSABI_IRIX, "Irix" },
|
||
{ ELFOSABI_FREEBSD, "FreeBSD" },
|
||
{ ELFOSABI_TRU64, "TRU64" },
|
||
{ ELFOSABI_MODESTO, "Modesto" },
|
||
{ ELFOSABI_OPENBSD, "OpenBSD" },
|
||
{ ELFOSABI_OPENVMS, "OpenVMS" },
|
||
{ ELFOSABI_NSK, "NSK" },
|
||
{ ELFOSABI_AROS, "AROS" },
|
||
{ ELFOSABI_FENIXOS, "FenixOS" }
|
||
};
|
||
|
||
/* Return ELFOSABI_XXX for an OSABI string, OSABI. */
|
||
|
||
static int
|
||
elf_osabi (const char *osabi)
|
||
{
|
||
unsigned int i;
|
||
|
||
for (i = 0; i < ARRAY_SIZE (osabis); i++)
|
||
if (strcasecmp (osabi, osabis[i].name) == 0)
|
||
return osabis[i].osabi;
|
||
|
||
error (_("Unknown OSABI: %s\n"), osabi);
|
||
|
||
return -1;
|
||
}
|
||
|
||
/* Return EM_XXX for a machine string, MACH. */
|
||
|
||
static int
|
||
elf_machine (const char *mach)
|
||
{
|
||
if (strcasecmp (mach, "i386") == 0)
|
||
return EM_386;
|
||
if (strcasecmp (mach, "iamcu") == 0)
|
||
return EM_IAMCU;
|
||
if (strcasecmp (mach, "l1om") == 0)
|
||
return EM_L1OM;
|
||
if (strcasecmp (mach, "k1om") == 0)
|
||
return EM_K1OM;
|
||
if (strcasecmp (mach, "x86_64") == 0)
|
||
return EM_X86_64;
|
||
if (strcasecmp (mach, "x86-64") == 0)
|
||
return EM_X86_64;
|
||
if (strcasecmp (mach, "none") == 0)
|
||
return EM_NONE;
|
||
|
||
error (_("Unknown machine type: %s\n"), mach);
|
||
|
||
return -1;
|
||
}
|
||
|
||
/* Return ET_XXX for a type string, TYPE. */
|
||
|
||
static int
|
||
elf_type (const char *type)
|
||
{
|
||
if (strcasecmp (type, "rel") == 0)
|
||
return ET_REL;
|
||
if (strcasecmp (type, "exec") == 0)
|
||
return ET_EXEC;
|
||
if (strcasecmp (type, "dyn") == 0)
|
||
return ET_DYN;
|
||
if (strcasecmp (type, "none") == 0)
|
||
return ET_NONE;
|
||
|
||
error (_("Unknown type: %s\n"), type);
|
||
|
||
return -1;
|
||
}
|
||
|
||
enum command_line_switch
|
||
{
|
||
OPTION_INPUT_MACH = 150,
|
||
OPTION_OUTPUT_MACH,
|
||
OPTION_INPUT_TYPE,
|
||
OPTION_OUTPUT_TYPE,
|
||
OPTION_INPUT_OSABI,
|
||
OPTION_OUTPUT_OSABI
|
||
};
|
||
|
||
static struct option options[] =
|
||
{
|
||
{"input-mach", required_argument, 0, OPTION_INPUT_MACH},
|
||
{"output-mach", required_argument, 0, OPTION_OUTPUT_MACH},
|
||
{"input-type", required_argument, 0, OPTION_INPUT_TYPE},
|
||
{"output-type", required_argument, 0, OPTION_OUTPUT_TYPE},
|
||
{"input-osabi", required_argument, 0, OPTION_INPUT_OSABI},
|
||
{"output-osabi", required_argument, 0, OPTION_OUTPUT_OSABI},
|
||
{"version", no_argument, 0, 'v'},
|
||
{"help", no_argument, 0, 'h'},
|
||
{0, no_argument, 0, 0}
|
||
};
|
||
|
||
static void
|
||
usage (FILE *stream, int exit_status)
|
||
{
|
||
fprintf (stream, _("Usage: %s <option(s)> elffile(s)\n"),
|
||
program_name);
|
||
fprintf (stream, _(" Update the ELF header of ELF files\n"));
|
||
fprintf (stream, _(" The options are:\n"));
|
||
fprintf (stream, _("\
|
||
--input-mach <machine> Set input machine type to <machine>\n\
|
||
--output-mach <machine> Set output machine type to <machine>\n\
|
||
--input-type <type> Set input file type to <type>\n\
|
||
--output-type <type> Set output file type to <type>\n\
|
||
--input-osabi <osabi> Set input OSABI to <osabi>\n\
|
||
--output-osabi <osabi> Set output OSABI to <osabi>\n\
|
||
-h --help Display this information\n\
|
||
-v --version Display the version number of %s\n\
|
||
"),
|
||
program_name);
|
||
if (REPORT_BUGS_TO[0] && exit_status == 0)
|
||
fprintf (stream, _("Report bugs to %s\n"), REPORT_BUGS_TO);
|
||
exit (exit_status);
|
||
}
|
||
|
||
int
|
||
main (int argc, char ** argv)
|
||
{
|
||
int c, status;
|
||
|
||
#if defined (HAVE_SETLOCALE) && defined (HAVE_LC_MESSAGES)
|
||
setlocale (LC_MESSAGES, "");
|
||
#endif
|
||
#if defined (HAVE_SETLOCALE)
|
||
setlocale (LC_CTYPE, "");
|
||
#endif
|
||
bindtextdomain (PACKAGE, LOCALEDIR);
|
||
textdomain (PACKAGE);
|
||
|
||
expandargv (&argc, &argv);
|
||
|
||
while ((c = getopt_long (argc, argv, "hv",
|
||
options, (int *) 0)) != EOF)
|
||
{
|
||
switch (c)
|
||
{
|
||
case OPTION_INPUT_MACH:
|
||
input_elf_machine = elf_machine (optarg);
|
||
if (input_elf_machine < 0)
|
||
return 1;
|
||
input_elf_class = elf_class (input_elf_machine);
|
||
if (input_elf_class == ELF_CLASS_UNKNOWN)
|
||
return 1;
|
||
break;
|
||
|
||
case OPTION_OUTPUT_MACH:
|
||
output_elf_machine = elf_machine (optarg);
|
||
if (output_elf_machine < 0)
|
||
return 1;
|
||
output_elf_class = elf_class (output_elf_machine);
|
||
if (output_elf_class == ELF_CLASS_UNKNOWN)
|
||
return 1;
|
||
break;
|
||
|
||
case OPTION_INPUT_TYPE:
|
||
input_elf_type = elf_type (optarg);
|
||
if (input_elf_type < 0)
|
||
return 1;
|
||
break;
|
||
|
||
case OPTION_OUTPUT_TYPE:
|
||
output_elf_type = elf_type (optarg);
|
||
if (output_elf_type < 0)
|
||
return 1;
|
||
break;
|
||
|
||
case OPTION_INPUT_OSABI:
|
||
input_elf_osabi = elf_osabi (optarg);
|
||
if (input_elf_osabi < 0)
|
||
return 1;
|
||
break;
|
||
|
||
case OPTION_OUTPUT_OSABI:
|
||
output_elf_osabi = elf_osabi (optarg);
|
||
if (output_elf_osabi < 0)
|
||
return 1;
|
||
break;
|
||
|
||
case 'h':
|
||
usage (stdout, 0);
|
||
|
||
case 'v':
|
||
print_version (program_name);
|
||
break;
|
||
|
||
default:
|
||
usage (stderr, 1);
|
||
}
|
||
}
|
||
|
||
if (optind == argc
|
||
|| (output_elf_machine == -1
|
||
&& output_elf_type == -1
|
||
&& output_elf_osabi == -1))
|
||
usage (stderr, 1);
|
||
|
||
status = 0;
|
||
while (optind < argc)
|
||
status |= process_file (argv[optind++]);
|
||
|
||
return status;
|
||
}
|