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binutils-gdb/bfd/coff-z80.c
Nick Clifton a11652892c More fixes for memory access errors triggered by attemps to examine corrupted binaries. 
PR binutils/17512
	* dwarf.c (display_block): Do nothing if the block starts after
	the end of the buffer.
	(read_and_display_attr_value): Add range checks.
	(struct Frame_Chunk): Make the ncols and ra fields unsigned.
	(frame_need_space): Test for an ncols of zero.
	(read_cie): Fail if the augmentation data extends off the end of
	the buffer.
	(display_debug_frames): Add checks for read_cie failing.  Add
	range checks.
	* coff-h8300.c (rtype2howto): Replace abort with returning a NULL
	value.
	* coff-h8500.c (rtype2howto): Likewise.
	* coff-tic30.c (rtype2howto): Likewise.
	* coff-z80.c (rtype2howto): Likewise.
	* coff-z8k.c (rtype2howto): Likewise.
	* coff-ia64.c (RTYPE2HOWTO): Always return a valid howto.
	* coff-m68k.c (m68k_rtype2howto): Return a NULL howto if none
	could be found.
	* coff-mcore.c (RTYPE2HOWTO): Add range checking.
	* coff-w65.c (rtype2howto): Likewise.
	* coff-we32k.c (RTYPE2HOWTO): Likewise.
	* pe-mips.c (RTYPE2HOWTO): Likewise.
	* coff-x86_64.c (coff_amd64_reloc): Likewise.  Replace abort with
	an error return.
	* coffcode.h (coff_slurp_reloc_table): Allow the rel parameter to
	be unused.
	* coffgen.c (make_a_section_from_file): Check the length of a
	section name before testing to see if it is a debug section name.
	(coff_object_p): Zero out any uninitialised bytes in the opt
	header.
	* ecoff.c (_bfd_ecoff_slurp_symbolic_info): Test for the raw
	source being empty when there are values to be processed.
	(_bfd_ecoff_slurp_symbol_table): Add range check.
	* mach-o.c (bfd_mach_o_canonicalize_one_reloc): Likewise.
	(bfd_mach_o_mangle_sections): Move test for too many sections to
	before the allocation of the section table.
	(bfd_mach_o_read_symtab_strtab): If the read fails, free the
	memory and nullify the symbol pointer.
	* reloc.c (bfd_generic_get_relocated_section_contents): Add
	handling of a bfd_reloc_notsupported return value.
	* versados.c (EDATA): Add range checking.
	(get_record): Likewise.
	(process_otr): Check for contents being available before updating
	them.
	(versados_canonicalize_reloc): Add range check.
2014-11-26 14:11:23 +00:00

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/* BFD back-end for Zilog Z80 COFF binaries.
Copyright (C) 2005-2014 Free Software Foundation, Inc.
Contributed by Arnold Metselaar <arnold_m@operamail.com>
This file is part of BFD, the Binary File Descriptor library.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
#include "sysdep.h"
#include "bfd.h"
#include "libbfd.h"
#include "bfdlink.h"
#include "coff/z80.h"
#include "coff/internal.h"
#include "libcoff.h"
#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER 0
static reloc_howto_type r_imm32 =
HOWTO (R_IMM32, 0, 2, 32, FALSE, 0,
complain_overflow_dont, 0, "r_imm32", TRUE, 0xffffffff, 0xffffffff,
FALSE);
static reloc_howto_type r_imm24 =
HOWTO (R_IMM24, 0, 1, 24, FALSE, 0,
complain_overflow_dont, 0, "r_imm24", TRUE, 0x00ffffff, 0x00ffffff,
FALSE);
static reloc_howto_type r_imm16 =
HOWTO (R_IMM16, 0, 1, 16, FALSE, 0,
complain_overflow_dont, 0, "r_imm16", TRUE, 0x0000ffff, 0x0000ffff,
FALSE);
static reloc_howto_type r_imm8 =
HOWTO (R_IMM8, 0, 0, 8, FALSE, 0,
complain_overflow_bitfield, 0, "r_imm8", TRUE, 0x000000ff, 0x000000ff,
FALSE);
static reloc_howto_type r_jr =
HOWTO (R_JR, 0, 0, 8, TRUE, 0,
complain_overflow_signed, 0, "r_jr", FALSE, 0, 0xFF,
FALSE);
static reloc_howto_type r_off8 =
HOWTO (R_OFF8, 0, 0, 8, FALSE, 0,
complain_overflow_signed, 0,"r_off8", FALSE, 0, 0xff,
FALSE);
#define BADMAG(x) Z80BADMAG(x)
#define Z80 1 /* Customize coffcode.h. */
#define __A_MAGIC_SET__
/* Code to swap in the reloc. */
#define SWAP_IN_RELOC_OFFSET H_GET_32
#define SWAP_OUT_RELOC_OFFSET H_PUT_32
#define SWAP_OUT_RELOC_EXTRA(abfd, src, dst) \
dst->r_stuff[0] = 'S'; \
dst->r_stuff[1] = 'C';
/* Code to turn a r_type into a howto ptr, uses the above howto table. */
static void
rtype2howto (arelent *internal, struct internal_reloc *dst)
{
switch (dst->r_type)
{
default:
internal->howto = NULL;
break;
case R_IMM8:
internal->howto = &r_imm8;
break;
case R_IMM16:
internal->howto = &r_imm16;
break;
case R_IMM24:
internal->howto = &r_imm24;
break;
case R_IMM32:
internal->howto = &r_imm32;
break;
case R_JR:
internal->howto = &r_jr;
break;
case R_OFF8:
internal->howto = &r_off8;
break;
}
}
#define RTYPE2HOWTO(internal, relocentry) rtype2howto (internal, relocentry)
static reloc_howto_type *
coff_z80_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
bfd_reloc_code_real_type code)
{
switch (code)
{
case BFD_RELOC_8: return & r_imm8;
case BFD_RELOC_16: return & r_imm16;
case BFD_RELOC_24: return & r_imm24;
case BFD_RELOC_32: return & r_imm32;
case BFD_RELOC_8_PCREL: return & r_jr;
case BFD_RELOC_Z80_DISP8: return & r_off8;
default: BFD_FAIL ();
return NULL;
}
}
static reloc_howto_type *
coff_z80_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
const char *r_name)
{
if (strcasecmp (r_imm8.name, r_name) == 0)
return &r_imm8;
if (strcasecmp (r_imm16.name, r_name) == 0)
return &r_imm16;
if (strcasecmp (r_imm24.name, r_name) == 0)
return &r_imm24;
if (strcasecmp (r_imm32.name, r_name) == 0)
return &r_imm32;
if (strcasecmp (r_jr.name, r_name) == 0)
return &r_jr;
if (strcasecmp (r_off8.name, r_name) == 0)
return &r_off8;
return NULL;
}
/* Perform any necessary magic to the addend in a reloc entry. */
#define CALC_ADDEND(abfd, symbol, ext_reloc, cache_ptr) \
cache_ptr->addend = ext_reloc.r_offset;
#define RELOC_PROCESSING(relent,reloc,symbols,abfd,section) \
reloc_processing(relent, reloc, symbols, abfd, section)
static void
reloc_processing (arelent *relent,
struct internal_reloc *reloc,
asymbol **symbols,
bfd *abfd,
asection *section)
{
relent->address = reloc->r_vaddr;
rtype2howto (relent, reloc);
if (reloc->r_symndx > 0)
relent->sym_ptr_ptr = symbols + obj_convert (abfd)[reloc->r_symndx];
else
relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr;
relent->addend = reloc->r_offset;
relent->address -= section->vma;
}
static void
extra_case (bfd *in_abfd,
struct bfd_link_info *link_info,
struct bfd_link_order *link_order,
arelent *reloc,
bfd_byte *data,
unsigned int *src_ptr,
unsigned int *dst_ptr)
{
asection * input_section = link_order->u.indirect.section;
int val;
switch (reloc->howto->type)
{
case R_OFF8:
val = bfd_coff_reloc16_get_value (reloc, link_info,
input_section);
if (val>127 || val<-128) /* Test for overflow. */
{
if (! ((*link_info->callbacks->reloc_overflow)
(link_info, NULL,
bfd_asymbol_name (*reloc->sym_ptr_ptr),
reloc->howto->name, reloc->addend, input_section->owner,
input_section, reloc->address)))
abort ();
}
bfd_put_8 (in_abfd, val, data + *dst_ptr);
(*dst_ptr) += 1;
(*src_ptr) += 1;
break;
case R_IMM8:
val = bfd_get_8 ( in_abfd, data+*src_ptr)
+ bfd_coff_reloc16_get_value (reloc, link_info, input_section);
bfd_put_8 (in_abfd, val, data + *dst_ptr);
(*dst_ptr) += 1;
(*src_ptr) += 1;
break;
case R_IMM16:
val = bfd_get_16 ( in_abfd, data+*src_ptr)
+ bfd_coff_reloc16_get_value (reloc, link_info, input_section);
bfd_put_16 (in_abfd, val, data + *dst_ptr);
(*dst_ptr) += 2;
(*src_ptr) += 2;
break;
case R_IMM24:
val = bfd_get_16 ( in_abfd, data+*src_ptr)
+ (bfd_get_8 ( in_abfd, data+*src_ptr+2) << 16)
+ bfd_coff_reloc16_get_value (reloc, link_info, input_section);
bfd_put_16 (in_abfd, val, data + *dst_ptr);
bfd_put_8 (in_abfd, val >> 16, data + *dst_ptr+2);
(*dst_ptr) += 3;
(*src_ptr) += 3;
break;
case R_IMM32:
val = bfd_get_32 ( in_abfd, data+*src_ptr)
+ bfd_coff_reloc16_get_value (reloc, link_info, input_section);
bfd_put_32 (in_abfd, val, data + *dst_ptr);
(*dst_ptr) += 4;
(*src_ptr) += 4;
break;
case R_JR:
{
bfd_vma dst = bfd_coff_reloc16_get_value (reloc, link_info,
input_section);
bfd_vma dot = (*dst_ptr
+ input_section->output_offset
+ input_section->output_section->vma);
int gap = dst - dot - 1; /* -1, Since the offset is relative
to the value of PC after reading
the offset. */
if (gap >= 128 || gap < -128)
{
if (! ((*link_info->callbacks->reloc_overflow)
(link_info, NULL,
bfd_asymbol_name (*reloc->sym_ptr_ptr),
reloc->howto->name, reloc->addend, input_section->owner,
input_section, reloc->address)))
abort ();
}
bfd_put_8 (in_abfd, gap, data + *dst_ptr);
(*dst_ptr)++;
(*src_ptr)++;
break;
}
default:
abort ();
}
}
#define coff_reloc16_extra_cases extra_case
#define coff_bfd_reloc_type_lookup coff_z80_reloc_type_lookup
#define coff_bfd_reloc_name_lookup coff_z80_reloc_name_lookup
#ifndef bfd_pe_print_pdata
#define bfd_pe_print_pdata NULL
#endif
#include "coffcode.h"
#undef coff_bfd_get_relocated_section_contents
#define coff_bfd_get_relocated_section_contents \
bfd_coff_reloc16_get_relocated_section_contents
#undef coff_bfd_relax_section
#define coff_bfd_relax_section bfd_coff_reloc16_relax_section
CREATE_LITTLE_COFF_TARGET_VEC (z80_coff_vec, "coff-z80", 0,
SEC_CODE | SEC_DATA, '\0', NULL,
COFF_SWAP_TABLE)
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