215 lines
5.6 KiB
C
215 lines
5.6 KiB
C
/* elf.c - load ELF files */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2003,2004,2005,2006,2007,2008,2009 Free Software Foundation, Inc.
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*
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* GRUB 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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*
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* GRUB 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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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/err.h>
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#include <grub/elf.h>
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#include <grub/elfload.h>
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#include <grub/file.h>
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#include <grub/misc.h>
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#include <grub/mm.h>
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#include <grub/dl.h>
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#include <grub/i18n.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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void grub_elf32_check_endianess (grub_elf_t elf);
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void grub_elf64_check_endianess (grub_elf_t elf);
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grub_err_t grub_elf32_check_version (grub_elf_t elf);
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grub_err_t grub_elf64_check_version (grub_elf_t elf);
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/* Check if EHDR is a valid ELF header. */
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static grub_err_t
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grub_elf_check_header (grub_elf_t elf)
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{
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Elf32_Ehdr *e = &elf->ehdr.ehdr32;
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if (e->e_ident[EI_MAG0] != ELFMAG0
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|| e->e_ident[EI_MAG1] != ELFMAG1
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|| e->e_ident[EI_MAG2] != ELFMAG2
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|| e->e_ident[EI_MAG3] != ELFMAG3
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|| e->e_ident[EI_VERSION] != EV_CURRENT)
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return grub_error (GRUB_ERR_BAD_OS, N_("invalid arch-independent ELF magic"));
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if (grub_elf_is_elf32 (elf))
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{
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grub_elf32_check_endianess (elf);
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grub_elf32_check_version (elf);
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}
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else if (grub_elf_is_elf64 (elf))
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{
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grub_elf64_check_endianess (elf);
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grub_elf64_check_version (elf);
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}
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else
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return grub_error (GRUB_ERR_BAD_OS, N_("invalid arch-dependent ELF magic"));
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return GRUB_ERR_NONE;
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}
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grub_err_t
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grub_elf_close (grub_elf_t elf)
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{
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grub_file_t file = elf->file;
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grub_free (elf->phdrs);
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grub_free (elf->filename);
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grub_free (elf);
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if (file)
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grub_file_close (file);
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return grub_errno;
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}
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grub_elf_t
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grub_elf_file (grub_file_t file, const char *filename)
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{
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grub_elf_t elf;
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elf = grub_zalloc (sizeof (*elf));
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if (! elf)
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return 0;
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elf->file = file;
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if (grub_file_seek (elf->file, 0) == (grub_off_t) -1)
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goto fail;
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if (grub_file_read (elf->file, &elf->ehdr, sizeof (elf->ehdr))
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!= sizeof (elf->ehdr))
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{
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if (!grub_errno)
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grub_error (GRUB_ERR_FILE_READ_ERROR, N_("premature end of file %s"),
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filename);
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goto fail;
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}
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if (grub_elf_check_header (elf))
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goto fail;
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elf->filename = grub_strdup (filename);
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if (!elf->filename)
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goto fail;
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return elf;
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fail:
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grub_free (elf->filename);
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grub_free (elf->phdrs);
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grub_free (elf);
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return 0;
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}
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grub_elf_t
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grub_elf_open (const char *name)
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{
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grub_file_t file;
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grub_elf_t elf;
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file = grub_file_open (name);
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if (! file)
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return 0;
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elf = grub_elf_file (file, name);
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if (! elf)
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grub_file_close (file);
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return elf;
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}
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/* 32-bit */
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#define ehdrXX ehdr32
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#define ELFCLASSXX ELFCLASS32
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#define ElfXX_Addr Elf32_Addr
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#define grub_elfXX_size grub_elf32_size
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#define grub_elfXX_load grub_elf32_load
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#define FOR_ELFXX_PHDRS FOR_ELF32_PHDRS
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#define grub_elf_is_elfXX grub_elf_is_elf32
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#define grub_elfXX_load_phdrs grub_elf32_load_phdrs
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#define ElfXX_Phdr Elf32_Phdr
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#define ElfXX_Ehdr Elf32_Ehdr
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#define grub_uintXX_t grub_uint32_t
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#define grub_be_to_halfXX grub_be_to_cpu16
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#define grub_be_to_wordXX grub_be_to_cpu32
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#define grub_be_to_addrXX grub_be_to_cpu32
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#define grub_be_to_offXX grub_be_to_cpu32
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#define grub_be_to_XwordXX grub_be_to_wordXX
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#define grub_le_to_halfXX grub_le_to_cpu16
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#define grub_le_to_wordXX grub_le_to_cpu32
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#define grub_le_to_addrXX grub_le_to_cpu32
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#define grub_le_to_offXX grub_le_to_cpu32
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#define grub_le_to_XwordXX grub_le_to_wordXX
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#define grub_elfXX_check_endianess grub_elf32_check_endianess
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#define grub_elfXX_check_version grub_elf32_check_version
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#include "elfXX.c"
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#undef ehdrXX
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#undef ELFCLASSXX
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#undef ElfXX_Addr
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#undef grub_elfXX_size
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#undef grub_elfXX_load
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#undef FOR_ELFXX_PHDRS
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#undef grub_elf_is_elfXX
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#undef grub_elfXX_load_phdrs
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#undef ElfXX_Phdr
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#undef ElfXX_Ehdr
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#undef grub_uintXX_t
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#undef grub_be_to_halfXX
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#undef grub_be_to_wordXX
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#undef grub_be_to_addrXX
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#undef grub_be_to_offXX
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#undef grub_be_to_XwordXX
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#undef grub_le_to_halfXX
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#undef grub_le_to_wordXX
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#undef grub_le_to_addrXX
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#undef grub_le_to_offXX
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#undef grub_le_to_XwordXX
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#undef grub_elfXX_check_endianess
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#undef grub_elfXX_check_version
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/* 64-bit */
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#define ehdrXX ehdr64
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#define ELFCLASSXX ELFCLASS64
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#define ElfXX_Addr Elf64_Addr
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#define grub_elfXX_size grub_elf64_size
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#define grub_elfXX_load grub_elf64_load
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#define FOR_ELFXX_PHDRS FOR_ELF64_PHDRS
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#define grub_elf_is_elfXX grub_elf_is_elf64
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#define grub_elfXX_load_phdrs grub_elf64_load_phdrs
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#define ElfXX_Phdr Elf64_Phdr
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#define ElfXX_Ehdr Elf64_Ehdr
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#define grub_uintXX_t grub_uint64_t
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#define grub_be_to_halfXX grub_be_to_cpu16
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#define grub_be_to_wordXX grub_be_to_cpu32
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#define grub_be_to_addrXX grub_be_to_cpu64
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#define grub_be_to_offXX grub_be_to_cpu64
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#define grub_be_to_XwordXX grub_be_to_cpu64
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#define grub_le_to_halfXX grub_le_to_cpu16
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#define grub_le_to_wordXX grub_le_to_cpu32
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#define grub_le_to_addrXX grub_le_to_cpu64
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#define grub_le_to_offXX grub_le_to_cpu64
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#define grub_le_to_XwordXX grub_le_to_cpu64
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#define grub_elfXX_check_endianess grub_elf64_check_endianess
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#define grub_elfXX_check_version grub_elf64_check_version
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#include "elfXX.c"
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