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binutils-gdb/binutils/dwarf.h
Nick Clifton 06614111d1 More fixes for memory access violations exposed by fuzzed binaries. 
PR binutils/17512
	* dwarf.h (struct dwarf_section): Add user_data field.
	* dwarf.c (frame_need_space): Check for an over large register
	number.
	(display_debug_frames): Check the return value from
	frame_need_space.  Check for a CFA expression that is so long the
	start address wraps around.
	(debug_displays): Initialise the user_data field.
	* objdump.c (load_specific_debug_section): Save the BFD section
	pointer in the user_data field of the dwarf_section structure.
	(free_debug_section): Update BFD section data when freeing section
	contents.
	* readelf.c (load_specific_debug_section): Initialise the
	user_data field.

	* archive.c (do_slurp_coff_armap): Add range checks to prevent
	running off the end of the string table.
	* compress.c (bfd_get_full_section_contents): Return a NULL
	pointer for zero sized sections.  Do not attempt to copy a buffer
	onto itself.
	* elf-attrs.c (_bfd_elf_parse_attributes): Check for an empty
	header.  Add range checks to avoid running off the end of the
	section.
	* elf.c (bfd_elf_get_str_section): Seek before allocating so that
	if the seek fails, no memory is allocated.
	(bfd_elf_string_from_elf_section): Do not allocate a string from a
	non string section.  It only leads to trouble later on.
	(_bfd_elf_print_private_bfd_data): Check for there being too
	little external dynamic data.
	(bfd_section_from_shdr): Replace assertion with a failure mode.
	(bfd_section_from_shdr): When walking a loaded group section use
	the internal structure size, not the external size.  Check for the
	group section being empty.
	* elf32-i386.c (elf_i386_rtype_to_howto): Replace assertion with a
	failure mode.
	* elfcode.h (elf_slurp_reloc_table): Likewise.
	* reloc.c (bfd_perform_relocation): Avoid seg-fault if the howto
	parameter is NULL.
2014-12-01 16:43:46 +00:00

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/* dwarf.h - DWARF support header file
Copyright (C) 2005-2014 Free Software Foundation, Inc.
This file is part of GNU Binutils.
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. */
typedef unsigned HOST_WIDEST_INT dwarf_vma;
typedef HOST_WIDEST_INT dwarf_signed_vma;
typedef unsigned HOST_WIDEST_INT dwarf_size_type;
/* Structure found in the .debug_line section. */
typedef struct
{
unsigned char li_length [4];
unsigned char li_version [2];
unsigned char li_prologue_length [4];
unsigned char li_min_insn_length [1];
unsigned char li_default_is_stmt [1];
unsigned char li_line_base [1];
unsigned char li_line_range [1];
unsigned char li_opcode_base [1];
}
DWARF2_External_LineInfo;
typedef struct
{
dwarf_vma li_length;
unsigned short li_version;
unsigned int li_prologue_length;
unsigned char li_min_insn_length;
unsigned char li_max_ops_per_insn;
unsigned char li_default_is_stmt;
int li_line_base;
unsigned char li_line_range;
unsigned char li_opcode_base;
}
DWARF2_Internal_LineInfo;
/* Structure found in .debug_pubnames section. */
typedef struct
{
unsigned char pn_length [4];
unsigned char pn_version [2];
unsigned char pn_offset [4];
unsigned char pn_size [4];
}
DWARF2_External_PubNames;
typedef struct
{
dwarf_vma pn_length;
unsigned short pn_version;
dwarf_vma pn_offset;
dwarf_vma pn_size;
}
DWARF2_Internal_PubNames;
/* Structure found in .debug_info section. */
typedef struct
{
unsigned char cu_length [4];
unsigned char cu_version [2];
unsigned char cu_abbrev_offset [4];
unsigned char cu_pointer_size [1];
}
DWARF2_External_CompUnit;
typedef struct
{
dwarf_vma cu_length;
unsigned short cu_version;
dwarf_vma cu_abbrev_offset;
unsigned char cu_pointer_size;
}
DWARF2_Internal_CompUnit;
typedef struct
{
unsigned char ar_length [4];
unsigned char ar_version [2];
unsigned char ar_info_offset [4];
unsigned char ar_pointer_size [1];
unsigned char ar_segment_size [1];
}
DWARF2_External_ARange;
typedef struct
{
dwarf_vma ar_length;
unsigned short ar_version;
dwarf_vma ar_info_offset;
unsigned char ar_pointer_size;
unsigned char ar_segment_size;
}
DWARF2_Internal_ARange;
/* N.B. The order here must match the order in debug_displays. */
enum dwarf_section_display_enum
{
abbrev = 0,
aranges,
frame,
info,
line,
pubnames,
gnu_pubnames,
eh_frame,
macinfo,
macro,
str,
loc,
pubtypes,
gnu_pubtypes,
ranges,
static_func,
static_vars,
types,
weaknames,
gdb_index,
trace_info,
trace_abbrev,
trace_aranges,
info_dwo,
abbrev_dwo,
types_dwo,
line_dwo,
loc_dwo,
macro_dwo,
macinfo_dwo,
str_dwo,
str_index,
str_index_dwo,
debug_addr,
dwp_cu_index,
dwp_tu_index,
max
};
struct dwarf_section
{
/* A debug section has a different name when it's stored compressed
or not. COMPRESSED_NAME and UNCOMPRESSED_NAME are the two
possibilities. NAME is set to whichever one is used for this
input file, as determined by load_debug_section(). */
const char *uncompressed_name;
const char *compressed_name;
const char *name;
unsigned char *start;
dwarf_vma address;
dwarf_size_type size;
enum dwarf_section_display_enum abbrev_sec;
/* A spare field for random use. */
void *user_data;
};
/* A structure containing the name of a debug section
and a pointer to a function that can decode it. */
struct dwarf_section_display
{
struct dwarf_section section;
int (*display) (struct dwarf_section *, void *);
int *enabled;
unsigned int relocate : 1;
};
extern struct dwarf_section_display debug_displays [];
/* This structure records the information that
we extract from the.debug_info section. */
typedef struct
{
unsigned int pointer_size;
unsigned int offset_size;
int dwarf_version;
dwarf_vma cu_offset;
dwarf_vma base_address;
/* This field is filled in when reading the attribute DW_AT_GNU_addr_base and
is used with the form DW_AT_GNU_FORM_addr_index. */
dwarf_vma addr_base;
/* This field is filled in when reading the attribute DW_AT_GNU_ranges_base and
is used when calculating ranges. */
dwarf_vma ranges_base;
/* This is an array of offsets to the location list table. */
dwarf_vma * loc_offsets;
int * have_frame_base;
unsigned int num_loc_offsets;
unsigned int max_loc_offsets;
/* List of .debug_ranges offsets seen in this .debug_info. */
dwarf_vma * range_lists;
unsigned int num_range_lists;
unsigned int max_range_lists;
}
debug_info;
extern int eh_addr_size;
extern int do_debug_info;
extern int do_debug_abbrevs;
extern int do_debug_lines;
extern int do_debug_pubnames;
extern int do_debug_pubtypes;
extern int do_debug_aranges;
extern int do_debug_ranges;
extern int do_debug_frames;
extern int do_debug_frames_interp;
extern int do_debug_macinfo;
extern int do_debug_str;
extern int do_debug_loc;
extern int do_gdb_index;
extern int do_trace_info;
extern int do_trace_abbrevs;
extern int do_trace_aranges;
extern int do_debug_addr;
extern int do_debug_cu_index;
extern int do_wide;
extern int dwarf_cutoff_level;
extern unsigned long dwarf_start_die;
extern int dwarf_check;
extern void init_dwarf_regnames (unsigned int);
extern void init_dwarf_regnames_i386 (void);
extern void init_dwarf_regnames_x86_64 (void);
extern void init_dwarf_regnames_aarch64 (void);
extern int load_debug_section (enum dwarf_section_display_enum, void *);
extern void free_debug_section (enum dwarf_section_display_enum);
extern void free_debug_memory (void);
extern void dwarf_select_sections_by_names (const char *);
extern void dwarf_select_sections_by_letters (const char *);
extern void dwarf_select_sections_all (void);
unsigned int * find_cu_tu_set (void *, unsigned int);
void * cmalloc (size_t, size_t);
void * xcmalloc (size_t, size_t);
void * xcrealloc (void *, size_t, size_t);
extern dwarf_vma read_leb128 (unsigned char *, unsigned int *, bfd_boolean, const unsigned char * const);
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