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Suport for bi-endianess in elf file

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* grub-core/kern/elf.c: check and switch endianess with grub_{be,le}_to
cpu functions.
* grub-core/kern/elfXX.c: Likewise.

Also-by: Tomohiro B Berry <tbberry@us.ibm.com>
This commit is contained in:
Paulo Flabiano Smorigo 2015-01-23 08:03:30 -02:00
parent 21143c3fde
commit b14d85db89
2 changed files with 131 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

60
grub-core/kern/elf.c
View file

@ -28,6 +28,11 @@
GRUB_MOD_LICENSE ("GPLv3+"); GRUB_MOD_LICENSE ("GPLv3+");
void grub_elf32_check_endianess (grub_elf_t elf);
void grub_elf64_check_endianess (grub_elf_t elf);
grub_err_t grub_elf32_check_version (grub_elf_t elf);
grub_err_t grub_elf64_check_version (grub_elf_t elf);
/* Check if EHDR is a valid ELF header. */ /* Check if EHDR is a valid ELF header. */
static grub_err_t static grub_err_t
grub_elf_check_header (grub_elf_t elf) grub_elf_check_header (grub_elf_t elf)
@ -38,10 +43,22 @@ grub_elf_check_header (grub_elf_t elf)
|| e->e_ident[EI_MAG1] != ELFMAG1 || e->e_ident[EI_MAG1] != ELFMAG1
|| e->e_ident[EI_MAG2] != ELFMAG2 || e->e_ident[EI_MAG2] != ELFMAG2
|| e->e_ident[EI_MAG3] != ELFMAG3 || e->e_ident[EI_MAG3] != ELFMAG3
|| e->e_ident[EI_VERSION] != EV_CURRENT || e->e_ident[EI_VERSION] != EV_CURRENT)
|| e->e_version != EV_CURRENT)
return grub_error (GRUB_ERR_BAD_OS, N_("invalid arch-independent ELF magic")); return grub_error (GRUB_ERR_BAD_OS, N_("invalid arch-independent ELF magic"));
if (grub_elf_is_elf32 (elf))
{
grub_elf32_check_endianess (elf);
grub_elf32_check_version (elf);
}
else if (grub_elf_is_elf64 (elf))
{
grub_elf64_check_endianess (elf);
grub_elf64_check_version (elf);
}
else
return grub_error (GRUB_ERR_BAD_OS, N_("invalid arch-dependent ELF magic"));
return GRUB_ERR_NONE; return GRUB_ERR_NONE;
} }
@ -127,7 +144,20 @@ grub_elf_open (const char *name)
#define grub_elf_is_elfXX grub_elf_is_elf32 #define grub_elf_is_elfXX grub_elf_is_elf32
#define grub_elfXX_load_phdrs grub_elf32_load_phdrs #define grub_elfXX_load_phdrs grub_elf32_load_phdrs
#define ElfXX_Phdr Elf32_Phdr #define ElfXX_Phdr Elf32_Phdr
#define ElfXX_Ehdr Elf32_Ehdr
#define grub_uintXX_t grub_uint32_t #define grub_uintXX_t grub_uint32_t
#define grub_be_to_halfXX grub_be_to_cpu16
#define grub_be_to_wordXX grub_be_to_cpu32
#define grub_be_to_addrXX grub_be_to_cpu32
#define grub_be_to_offXX grub_be_to_cpu32
#define grub_be_to_XwordXX grub_be_to_wordXX
#define grub_le_to_halfXX grub_le_to_cpu16
#define grub_le_to_wordXX grub_le_to_cpu32
#define grub_le_to_addrXX grub_le_to_cpu32
#define grub_le_to_offXX grub_le_to_cpu32
#define grub_le_to_XwordXX grub_le_to_wordXX
#define grub_elfXX_check_endianess grub_elf32_check_endianess
#define grub_elfXX_check_version grub_elf32_check_version
#include "elfXX.c" #include "elfXX.c"
@ -140,7 +170,20 @@ grub_elf_open (const char *name)
#undef grub_elf_is_elfXX #undef grub_elf_is_elfXX
#undef grub_elfXX_load_phdrs #undef grub_elfXX_load_phdrs
#undef ElfXX_Phdr #undef ElfXX_Phdr
#undef ElfXX_Ehdr
#undef grub_uintXX_t #undef grub_uintXX_t
#undef grub_be_to_halfXX
#undef grub_be_to_wordXX
#undef grub_be_to_addrXX
#undef grub_be_to_offXX
#undef grub_be_to_XwordXX
#undef grub_le_to_halfXX
#undef grub_le_to_wordXX
#undef grub_le_to_addrXX
#undef grub_le_to_offXX
#undef grub_le_to_XwordXX
#undef grub_elfXX_check_endianess
#undef grub_elfXX_check_version
/* 64-bit */ /* 64-bit */
@ -153,6 +196,19 @@ grub_elf_open (const char *name)
#define grub_elf_is_elfXX grub_elf_is_elf64 #define grub_elf_is_elfXX grub_elf_is_elf64
#define grub_elfXX_load_phdrs grub_elf64_load_phdrs #define grub_elfXX_load_phdrs grub_elf64_load_phdrs
#define ElfXX_Phdr Elf64_Phdr #define ElfXX_Phdr Elf64_Phdr
#define ElfXX_Ehdr Elf64_Ehdr
#define grub_uintXX_t grub_uint64_t #define grub_uintXX_t grub_uint64_t
#define grub_be_to_halfXX grub_be_to_cpu16
#define grub_be_to_wordXX grub_be_to_cpu32
#define grub_be_to_addrXX grub_be_to_cpu64
#define grub_be_to_offXX grub_be_to_cpu64
#define grub_be_to_XwordXX grub_be_to_cpu64
#define grub_le_to_halfXX grub_le_to_cpu16
#define grub_le_to_wordXX grub_le_to_cpu32
#define grub_le_to_addrXX grub_le_to_cpu64
#define grub_le_to_offXX grub_le_to_cpu64
#define grub_le_to_XwordXX grub_le_to_cpu64
#define grub_elfXX_check_endianess grub_elf64_check_endianess
#define grub_elfXX_check_version grub_elf64_check_version
#include "elfXX.c" #include "elfXX.c"

73
grub-core/kern/elfXX.c
View file

@ -154,3 +154,76 @@ grub_elfXX_load (grub_elf_t elf, const char *filename,
return grub_errno; return grub_errno;
} }
void
grub_elfXX_check_endianess (grub_elf_t elf)
{
ElfXX_Ehdr *e = &(elf->ehdr.ehdrXX);
ElfXX_Phdr *phdr;
if (e->e_ident[EI_DATA] == ELFDATA2MSB)
{
e->e_type = grub_be_to_halfXX (e->e_type);
e->e_machine = grub_be_to_halfXX (e->e_machine);
e->e_version = grub_be_to_wordXX (e->e_version);
e->e_entry = grub_be_to_addrXX (e->e_entry);
e->e_phoff = grub_be_to_offXX (e->e_phoff);
e->e_shoff = grub_be_to_offXX (e->e_shoff);
e->e_flags = grub_be_to_wordXX (e->e_flags);
e->e_ehsize = grub_be_to_halfXX (e->e_ehsize);
e->e_phentsize = grub_be_to_halfXX (e->e_phentsize);
e->e_phnum = grub_be_to_halfXX (e->e_phnum);
e->e_shentsize = grub_be_to_halfXX (e->e_shentsize);
e->e_shnum = grub_be_to_halfXX (e->e_shnum);
e->e_shstrndx = grub_be_to_halfXX (e->e_shstrndx);
FOR_ELFXX_PHDRS (elf,phdr)
{
phdr->p_type = grub_be_to_wordXX (phdr->p_type);
phdr->p_flags = grub_be_to_wordXX (phdr->p_flags);
phdr->p_offset = grub_be_to_offXX (phdr->p_offset);
phdr->p_vaddr = grub_be_to_addrXX (phdr->p_vaddr);
phdr->p_paddr = grub_be_to_addrXX (phdr->p_paddr);
phdr->p_filesz = grub_be_to_XwordXX (phdr->p_filesz);
phdr->p_memsz = grub_be_to_XwordXX (phdr->p_memsz);
phdr->p_align = grub_be_to_XwordXX (phdr->p_align);
}
}
else if (e->e_ident[EI_DATA] == ELFDATA2LSB)
{
e->e_type = grub_le_to_halfXX (e->e_type);
e->e_machine = grub_le_to_halfXX (e->e_machine);
e->e_version = grub_le_to_wordXX (e->e_version);
e->e_entry = grub_le_to_addrXX (e->e_entry);
e->e_phoff = grub_le_to_offXX (e->e_phoff);
e->e_shoff = grub_le_to_offXX (e->e_shoff);
e->e_flags = grub_le_to_wordXX (e->e_flags);
e->e_ehsize = grub_le_to_halfXX (e->e_ehsize);
e->e_phentsize = grub_le_to_halfXX (e->e_phentsize);
e->e_phnum = grub_le_to_halfXX (e->e_phnum);
e->e_shentsize = grub_le_to_halfXX (e->e_shentsize);
e->e_shnum = grub_le_to_halfXX (e->e_shnum);
e->e_shstrndx = grub_le_to_halfXX (e->e_shstrndx);
FOR_ELFXX_PHDRS (elf,phdr)
{
phdr->p_type = grub_le_to_wordXX (phdr->p_type);
phdr->p_flags = grub_le_to_wordXX (phdr->p_flags);
phdr->p_offset = grub_le_to_offXX (phdr->p_offset);
phdr->p_vaddr = grub_le_to_addrXX (phdr->p_vaddr);
phdr->p_paddr = grub_le_to_addrXX (phdr->p_paddr);
phdr->p_filesz = grub_le_to_XwordXX (phdr->p_filesz);
phdr->p_memsz = grub_le_to_XwordXX (phdr->p_memsz);
phdr->p_align = grub_le_to_XwordXX (phdr->p_align);
}
}
}
grub_err_t
grub_elfXX_check_version (grub_elf_t elf)
{
if (elf->ehdr.ehdrXX.e_version != EV_CURRENT)
return grub_error (GRUB_ERR_BAD_OS, N_("invalid arch-independent ELF magic"));
return GRUB_ERR_NONE;
}