void fix_dynamic_table(elf_bf_exec_t *env)
{
elfsh_Dyn *dyn;
elfshobj_t *f = env->ee_lm.lm_f;
dyn = elfsh_get_dynamic_entry_by_type(f, DT_RELA);
env->ee_rela_orig = elfsh_get_dynentry_val(dyn);
elfsh_set_dynentry_val(dyn, elfsh_get_section_addr(env->ee_lm.lm_reloc->shdr));
dyn = elfsh_get_dynamic_entry_by_type(f, DT_RELASZ);
env->ee_relasz_orig = elfsh_get_dynentry_val(dyn);
elfsh_set_dynentry_val(dyn, elfsh_get_section_size(env->ee_lm.lm_reloc->shdr));
env->ee_dt_relasz_value = elfsh_get_section_size(env->ee_lm.lm_reloc->shdr);
env->ee_reloc_end_value = elfsh_get_section_addr(env->ee_lm.lm_reloc->shdr) + env->ee_dt_relasz_value;
dyn = elfsh_get_dynamic_entry_by_type(f, DT_GNU_HASH);
env->ee_dt_gnu_hash = elfsh_get_dynentry_val(dyn);
dyn = elfsh_get_dynamic_entry_by_type(f, DT_SYMTAB);
env->ee_sym_orig = elfsh_get_dynentry_val(dyn);
elfsh_set_dynentry_val(dyn, elfsh_get_section_addr(env->ee_lm.lm_sym->shdr));
dyn = elfsh_get_dynamic_entry_by_type(f, DT_JMPREL);
env->ee_dt_jmprel_value = elfsh_get_dynentry_val(dyn);
elfsh_set_dynentry_val(dyn, 0);
dyn = elfsh_get_dynamic_entry_by_type(f, DT_PLTRELSZ);
env->ee_dt_pltrelsz_value = elfsh_get_dynentry_val(dyn);
elfsh_set_dynentry_val(dyn, 0);
//dyn = elfsh_get_dynamic_entry_by_type(f, DT_SYMENT);
//env->ee_sym_orig = elfsh_get_dynentry_val(dyn);
}
void fixup_dynamic_rela(elfshobj_t *f, eresi_Addr rel, eresi_Addr sz)
{
elfsh_Dyn *dyn;
dyn = elfsh_get_dynamic_entry_by_type(f, DT_RELA);
elfsh_set_dynentry_val(dyn, rel);
dyn = elfsh_get_dynamic_entry_by_type(f, DT_RELASZ);
elfsh_set_dynentry_val(dyn, sz);
}
/**
* @brief Change the DT_PLTGOT entry in the .dynamic section to change
* the relocation base address.
* @param file The host file.
* @param altgot Section descriptor for the .elfsh.altgot section.
* @param got Section descriptor for the .got section.
* @param plt Section descriptor for the .plt section.
* @param altplt Section descriptor for the .elfsh.altplt section.
* @return Success (0) or Error (-1).
*/
int elfsh_redirect_pltgot(elfshobj_t *file,
elfshsect_t *altgot,
elfshsect_t *got,
elfshsect_t *plt,
elfshsect_t *altplt)
{
elfsh_Sym *sym;
elfsh_Dyn *dyn;
elfshsect_t *relplt;
char *name;
PROFILER_IN(__FILE__, __FUNCTION__, __LINE__);
/* Get the DT_PLTGOT entry in .dynamic */
dyn = elfsh_get_dynamic_entry_by_type(file, DT_PLTGOT);
if (!dyn)
PROFILER_ERR(__FILE__, __FUNCTION__, __LINE__,
"Cannot find DT_PLTGOT", -1);
/* Get the PLT related relocation table */
name = IS_REL(plt) ? ELFSH_SECTION_NAME_RELPLT : ELFSH_SECTION_NAME_RELAPLT;
relplt = elfsh_get_section_by_name(plt->parent, name, 0, 0, 0);
if (!relplt)
PROFILER_ERR(__FILE__, __FUNCTION__, __LINE__,
"Cannot find RELPLT section by name", -1);
/* On MIPS we change it from .got to .alt.got : ALTGOT technique */
if (FILE_IS_MIPS(file) || FILE_IS_IA32(file))
{
elfsh_set_dynentry_val(dyn, altgot->shdr->sh_addr);
if (FILE_IS_MIPS(file))
{
elfsh_set_gpvalue(file, altgot->shdr->sh_addr + 0x8000 - 0x10);
sym = elfsh_get_dynsymbol_by_name(file, "_gp_disp");
if (sym == NULL)
PROFILER_ERR(__FILE__, __FUNCTION__, __LINE__,
"Could not find _gp_disp ", -1);
sym->st_value = altgot->shdr->sh_addr + 0x8000 - 0x10;
elfsh_shift_mips_relocs(file, altgot->shdr->sh_addr - got->shdr->sh_addr);
}
else
elfsh_shift_ia32_relocs(file,
altgot->shdr->sh_addr - got->shdr->sh_addr, relplt,
ELFSH_NOLIMIT);
}
/* On SPARC we change it from .plt to .alt.plt : ALTPLT technique */
else if (FILE_IS_SPARC(file))
{
elfsh_set_dynentry_val(dyn, altplt->shdr->sh_addr);
elfsh_shift_sparc_relocs(file, altplt->shdr->sh_addr - plt->shdr->sh_addr, relplt);
}
PROFILER_ROUT(__FILE__, __FUNCTION__, __LINE__, 0);
}
/**
* Remap the .dynamic section
* @param sect
* @param diff
* @return
*/
int elfsh_reloc_dynamic(elfshsect_t *sect, eresi_Addr diff)
{
elfshsect_t *parent;
elfsh_Dyn *dyn;
u_int index;
u_int count;
eresi_Addr val;
u_int nbr;
PROFILER_IN(__FILE__, __FUNCTION__, __LINE__);
if (sect == NULL || sect->shdr == NULL)
PROFILER_ERR(__FILE__, __FUNCTION__, __LINE__,
"Invalid NULL parameter", -1);
else if (sect->shdr->sh_type != SHT_DYNAMIC)
PROFILER_ERR(__FILE__, __FUNCTION__, __LINE__,
"Unexpected section type", -1);
nbr = sect->shdr->sh_size / sizeof(elfsh_Dyn);
for (dyn = elfsh_readmem(sect), count = index = 0; index < nbr; index++)
{
val = elfsh_get_dynentry_val(dyn + index);
parent = elfsh_get_parent_section(sect->parent, val, NULL);
if (val && parent != NULL && parent->shdr->sh_addr != NULL)
{
elfsh_set_dynentry_val(dyn + index, val + diff);
count++;
}
}
PROFILER_ROUT(__FILE__, __FUNCTION__, __LINE__, (count));
}
void fixup_dynamic_sym(elfshobj_t *f, eresi_Addr sym, eresi_Addr sz)
{
elfsh_Dyn *dyn;
dyn = elfsh_get_dynamic_entry_by_type(f, DT_SYMTAB);
elfsh_set_dynentry_val(dyn, sym);
//dyn = elfsh_get_dynamic_entry_by_type(f, DT_RELASZ);
//elfsh_set_dynentry_val(dyn, sz);
}
/**
* Shift the .dynamic section in ET_DYN files
*
* @param file
* @param size
* @return
*/
int elfsh_shift_dynamic(elfshobj_t *file, u_int size)
{
elfsh_Dyn *dyn;
u_int nbr;
u_int idx;
PROFILER_IN(__FILE__, __FUNCTION__, __LINE__);
dyn = elfsh_get_dynamic(file, &nbr);
if (dyn == NULL)
PROFILER_ERR(__FILE__, __FUNCTION__, __LINE__,
"Cannot find .dynamic in ET_DYN", -1);
for (idx = 0; idx < nbr; idx++)
if (elfsh_shiftable_dynent(dyn + idx))
elfsh_set_dynentry_val(dyn + idx,
elfsh_get_dynentry_val(dyn + idx) + size);
PROFILER_ROUT(__FILE__, __FUNCTION__, __LINE__, (0));
}
