From 2dae852b62bb2227ba2e4faf4864c7779104657a Mon Sep 17 00:00:00 2001

From: Paulo Flabiano Smorigo <pfsmorigo@linux.vnet.ibm.com>

Date: Fri, 15 Aug 2014 14:39:53 -0300

Subject: [PATCH 143/198] Suport for bi-endianess in elf file

* 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>

---

 grub-core/kern/elf.c   | 60 +++++++++++++++++++++++++++++++++++++++--

 grub-core/kern/elfXX.c | 73 ++++++++++++++++++++++++++++++++++++++++++++++++++

 2 files changed, 131 insertions(+), 2 deletions(-)

diff --git a/grub-core/kern/elf.c b/grub-core/kern/elf.c

index 5f99c43..de90811 100644

--- a/grub-core/kern/elf.c

+++ b/grub-core/kern/elf.c

@@ -28,6 +28,11 @@

 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.  */

 static grub_err_t

 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_MAG2] != ELFMAG2

       || e->e_ident[EI_MAG3] != ELFMAG3

-      || e->e_ident[EI_VERSION] != EV_CURRENT

-      || e->e_version != EV_CURRENT)

+      || e->e_ident[EI_VERSION] != EV_CURRENT)

     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;

 }

@@ -127,7 +144,20 @@ grub_elf_open (const char *name)

 #define grub_elf_is_elfXX grub_elf_is_elf32

 #define grub_elfXX_load_phdrs grub_elf32_load_phdrs

 #define ElfXX_Phdr Elf32_Phdr

+#define ElfXX_Ehdr Elf32_Ehdr

 #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"

@@ -140,7 +170,20 @@ grub_elf_open (const char *name)

 #undef grub_elf_is_elfXX

 #undef grub_elfXX_load_phdrs

 #undef ElfXX_Phdr

+#undef ElfXX_Ehdr

 #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 */

@@ -153,6 +196,19 @@ grub_elf_open (const char *name)

 #define grub_elf_is_elfXX grub_elf_is_elf64

 #define grub_elfXX_load_phdrs grub_elf64_load_phdrs

 #define ElfXX_Phdr Elf64_Phdr

+#define ElfXX_Ehdr Elf64_Ehdr

 #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"

diff --git a/grub-core/kern/elfXX.c b/grub-core/kern/elfXX.c

index 1d09971..ecf9df6 100644

--- a/grub-core/kern/elfXX.c

+++ b/grub-core/kern/elfXX.c

@@ -154,3 +154,76 @@ grub_elfXX_load (grub_elf_t elf, const char *filename,

   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;

+}

-- 

2.7.4