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2009-06-04 Vladimir Serbinenko <phcoder@gmail.com> 

Fix wrong assumptions with grub-mkimage on EFI
	
	* i386/efi/grub-mkimage.c (read_kernel_module): don't write prefox here
	(relocate_addresses): consider both r_addend and value at offset
	(make_mods_section): zerofill modinfo and header
	(convert_elf): write prefix here
This commit is contained in:
phcoder 2009-06-04 19:32:46 +00:00
parent 5389763d12
commit fd2bf2e388
2 changed files with 45 additions and 19 deletions
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9
ChangeLog
View File

@ -1,3 +1,12 @@
2009-06-04 Vladimir Serbinenko <phcoder@gmail.com>
Fix wrong assumptions with grub-mkimage on EFI
* i386/efi/grub-mkimage.c (read_kernel_module): don't write prefox here
(relocate_addresses): consider both r_addend and value at offset
(make_mods_section): zerofill modinfo and header
(convert_elf): write prefix here
2009-06-04 Vladimir Serbinenko <phcoder@gmail.com>
Use .asciz instead of .string

55
util/i386/efi/grub-mkimage.c
View File

@ -88,7 +88,7 @@ align_pe32_section (Elf_Addr addr)
/* Read the whole kernel image. Return the pointer to a read image,
and store the size in bytes in *SIZE. */
static char *
read_kernel_module (const char *dir, char *prefix, size_t *size)
read_kernel_module (const char *dir, size_t *size)
{
char *kernel_image;
char *kernel_path;
@ -98,11 +98,6 @@ read_kernel_module (const char *dir, char *prefix, size_t *size)
kernel_image = grub_util_read_image (kernel_path);
free (kernel_path);
if (GRUB_KERNEL_MACHINE_PREFIX + strlen (prefix) + 1 > GRUB_KERNEL_MACHINE_DATA_END)
grub_util_error ("prefix too long");
strcpy (kernel_image + sizeof (Elf_Ehdr) + GRUB_KERNEL_MACHINE_PREFIX, prefix);
return kernel_image;
}
@ -378,7 +373,8 @@ relocate_addresses (Elf_Ehdr *e, Elf_Shdr *sections,
Elf_Addr info;
Elf_Addr offset;
Elf_Addr sym_addr;
Elf_Addr *target, *value;
Elf_Addr *target;
Elf_Addr addend;
offset = grub_le_to_cpu (r->r_offset);
target = get_target_address (e, target_section, offset);
@ -386,8 +382,8 @@ relocate_addresses (Elf_Ehdr *e, Elf_Shdr *sections,
sym_addr = get_symbol_address (e, symtab_section,
ELF_R_SYM (info));
value = (s->sh_type == grub_cpu_to_le32 (SHT_RELA)) ?
(Elf_Addr *) &r->r_addend : target;
addend = (s->sh_type == grub_cpu_to_le32 (SHT_RELA)) ?
r->r_addend : 0;
switch (ELF_R_TYPE (info))
{
@ -397,16 +393,16 @@ relocate_addresses (Elf_Ehdr *e, Elf_Shdr *sections,
case R_386_32:
/* This is absolute. */
*target = grub_cpu_to_le32 (grub_le_to_cpu32 (*value)
+ sym_addr);
*target = grub_cpu_to_le32 (grub_le_to_cpu32 (*target)
+ addend + sym_addr);
grub_util_info ("relocating an R_386_32 entry to 0x%x at the offset 0x%x",
*target, offset);
break;
case R_386_PC32:
/* This is relative. */
*target = grub_cpu_to_le32 (grub_le_to_cpu32 (*value)
+ sym_addr
*target = grub_cpu_to_le32 (grub_le_to_cpu32 (*target)
+ addend + sym_addr
- target_section_addr - offset);
grub_util_info ("relocating an R_386_PC32 entry to 0x%x at the offset 0x%x",
*target, offset);
@ -418,7 +414,8 @@ relocate_addresses (Elf_Ehdr *e, Elf_Shdr *sections,
break;
case R_X86_64_64:
*target = grub_cpu_to_le64 (grub_le_to_cpu64 (*value) + sym_addr);
*target = grub_cpu_to_le64 (grub_le_to_cpu64 (*target)
+ addend + sym_addr);
grub_util_info ("relocating an R_X86_64_64 entry to 0x%llx at the offset 0x%llx",
*target, offset);
break;
@ -426,8 +423,8 @@ relocate_addresses (Elf_Ehdr *e, Elf_Shdr *sections,
case R_X86_64_PC32:
{
grub_uint32_t *t32 = (grub_uint32_t *) target;
*t32 = grub_cpu_to_le64 (grub_le_to_cpu64 (*value)
+ sym_addr
*t32 = grub_cpu_to_le64 (grub_le_to_cpu32 (*t32)
+ addend + sym_addr
- target_section_addr - offset);
grub_util_info ("relocating an R_X86_64_PC32 entry to 0x%x at the offset 0x%llx",
*t32, offset);
@ -438,8 +435,8 @@ relocate_addresses (Elf_Ehdr *e, Elf_Shdr *sections,
case R_X86_64_32S:
{
grub_uint32_t *t32 = (grub_uint32_t *) target;
*t32 = grub_cpu_to_le64 (grub_le_to_cpu64 (*value)
+ sym_addr);
*t32 = grub_cpu_to_le64 (grub_le_to_cpu32 (*t32)
+ addend + sym_addr);
grub_util_info ("relocating an R_X86_64_32(S) entry to 0x%x at the offset 0x%llx",
*t32, offset);
break;
@ -689,6 +686,8 @@ make_mods_section (FILE *out, Elf_Addr current_address,
struct grub_module_info modinfo;
Elf_Addr addr;
memset (&modinfo, 0, sizeof (modinfo));
path_list = grub_util_resolve_dependencies (dir, "moddep.lst", mods);
total_module_size = sizeof (struct grub_module_info);
@ -713,6 +712,8 @@ make_mods_section (FILE *out, Elf_Addr current_address,
size_t mod_size;
char *mod_image;
memset (&header, 0, sizeof (header));
grub_util_info ("adding module %s", p->name);
mod_size = grub_util_get_image_size (p->name);
@ -973,9 +974,11 @@ convert_elf (const char *dir, char *prefix, FILE *out, char *mods[])
Elf_Addr start_address;
Elf_Addr text_address, data_address, reloc_address, mods_address;
Elf_Addr end_address;
Elf_Shdr *s;
int i;
/* Get the kernel image and check the format. */
kernel_image = read_kernel_module (dir, prefix, &kernel_size);
kernel_image = read_kernel_module (dir, &kernel_size);
e = (Elf_Ehdr *) kernel_image;
if (! check_elf_header (e, kernel_size))
grub_util_error ("invalid ELF header");
@ -990,6 +993,20 @@ convert_elf (const char *dir, char *prefix, FILE *out, char *mods[])
sections = (Elf_Shdr *) (kernel_image + section_offset);
strtab = find_strtab (e, sections, section_entsize);
for (i = 0, s = sections;
i < num_sections;
i++, s = (Elf_Shdr *) ((char *) s + section_entsize))
if (is_text_section (s))
{
Elf_Off offset = grub_le_to_cpu32 (s->sh_offset);
if (GRUB_KERNEL_MACHINE_PREFIX + strlen (prefix) + 1 > GRUB_KERNEL_MACHINE_DATA_END)
grub_util_error ("prefix too long");
strcpy (kernel_image + offset + GRUB_KERNEL_MACHINE_PREFIX, prefix);
break;
}
/* Relocate sections then symbols in the virtual address space. */
section_addresses = locate_sections (sections, section_entsize,
num_sections, strtab);