Fuzz introspector
For issues and ideas: https://github.com/ossf/fuzz-introspector/issues

Fuzzer details

Fuzzer: fuzz_init_binary

Call tree

The calltree shows the control flow of the fuzzer. This is overlaid with coverage information to display how much of the potential code a fuzzer can reach is in fact covered at runtime. In the following there is a link to a detailed calltree visualisation as well as a bitmap showing a high-level view of the calltree. For further information about these topics please see the glossary for full calltree and calltree overview

Call tree overview bitmap:

The distribution of callsites in terms of coloring is
Color Runtime hitcount Callsite count Percentage
red 0 92 15.1%
gold [1:9] 25 4.11%
yellow [10:29] 15 2.47%
greenyellow [30:49] 10 1.64%
lawngreen 50+ 465 76.6%
All colors 607 100

Fuzz blockers

The followings are the branches where fuzzer fails to bypass.

Unique non-covered Complexity Unique Reachable Complexities Unique Reachable Functions All non-covered Complexity All Reachable Complexity Function Name Function Callsite Blocked Branch
53 53 1 :

['apply_rela_entries']

53 53 elf_relocations_nolibelf call site /src/libdwarf/src/lib/libdwarf/dwarf_elfread.c:475
32 32 2 :

['_dwarfstring_append_spaces', '_dwarfstring_append_zeros']

34 70 dwarfstring_append_printf_u call site /src/libdwarf/src/lib/libdwarf/dwarf_string.c:844
16 16 1 :

['_dwarfstring_append_spaces']

18 42 dwarfstring_append_printf_s call site /src/libdwarf/src/lib/libdwarf/dwarf_string.c:324
10 120 4 :

['dwarf_dealloc', 'dwarf_errno', 'dwarfstring_append', 'dwarf_errmsg']

10 384 dwarf_object_init_b call site /src/libdwarf/src/lib/libdwarf/dwarf_init_finish.c:1621
10 29 5 :

['_dwarf_add_to_static_err_list', 'calloc', 'dwarfstring_append', 'dwarfstring_constructor', '_dwarf_special_no_dbg_error_malloc']

10 88 _dwarf_error_string call site /src/libdwarf/src/lib/libdwarf/dwarf_error.c:120
8 8 1 :

['_dwarf_error_destructor']

8 55 dwarf_dealloc call site /src/libdwarf/src/lib/libdwarf/dwarf_alloc.c:885
3 3 1 :

['allocate_ts_entry']

3 3 tsearch_inner call site /src/libdwarf/src/lib/libdwarf/dwarf_tsearchhash.c:479
2 2 1 :

['fclose']

2 350 _dwarf_free_all_of_one_debug call site /src/libdwarf/src/lib/libdwarf/dwarf_alloc.c:1076
2 2 1 :

['close']

2 157 dwarf_finish call site /src/libdwarf/src/lib/libdwarf/dwarf_generic_init.c:456
2 2 1 :

['close']

2 2 _dwarf_destruct_macho_access call site /src/libdwarf/src/lib/libdwarf/dwarf_machoread.c:241
2 2 1 :

['close']

2 2 _dwarf_destruct_pe_access call site /src/libdwarf/src/lib/libdwarf/dwarf_peread.c:462
0 111 3 :

['dwarfstring_destructor', 'dwarfstring_string', '_dwarf_error_string']

0 111 dwarf_object_init_b call site /src/libdwarf/src/lib/libdwarf/dwarf_init_finish.c:1635

Runtime coverage analysis

Covered functions
169
Functions that are reachable but not covered
32
Reachable functions
180
Percentage of reachable functions covered
82.22%
NB: The sum of covered functions and functions that are reachable but not covered need not be equal to Reachable functions . This is because the reachability analysis is an approximation and thus at runtime some functions may be covered that are not included in the reachability analysis. This is a limitation of our static analysis capabilities.
Function name source code lines source lines hit percentage hit

Files reached

filename functions hit
/src/fuzz_init_binary.c 1
dwarf_generic_init.c 3
dwarf_error.c 5
dwarf_alloc.c 14
dwarf_tsearchhash.c 12
dwarf_string.c 11
dwarf_object_detector.c 6
dwarf_object_read_common.c 1
dwarf_memcpy_swap.c 2
dwarf_elfread.c 4
dwarf_elf_load_headers.c 35
dwarf_init_finish.c 19
dwarf_groups.c 10
dwarf_xu_index.c 3
dwarf_harmless.c 2
dwarf_util.c 1
dwarf_rnglists.c 1
dwarf_loclists.c 1
dwarf_tied.c 1
dwarf_debuglink.c 1
dwarf_machoread.c 15
dwarf_safe_strcpy.c 1
dwarf_peread.c 13

Fuzzer: fuzz_init_path

Call tree

The calltree shows the control flow of the fuzzer. This is overlaid with coverage information to display how much of the potential code a fuzzer can reach is in fact covered at runtime. In the following there is a link to a detailed calltree visualisation as well as a bitmap showing a high-level view of the calltree. For further information about these topics please see the glossary for full calltree and calltree overview

Call tree overview bitmap:

The distribution of callsites in terms of coloring is
Color Runtime hitcount Callsite count Percentage
red 0 131 16.0%
gold [1:9] 23 2.81%
yellow [10:29] 12 1.46%
greenyellow [30:49] 7 0.85%
lawngreen 50+ 644 78.8%
All colors 817 100

Fuzz blockers

The followings are the branches where fuzzer fails to bypass.

Unique non-covered Complexity Unique Reachable Complexities Unique Reachable Functions All non-covered Complexity All Reachable Complexity Function Name Function Callsite Blocked Branch
139 1404 7 :

['dwarf_crc32', 'dwarf_finish', 'dwarf_gnu_debuglink', 'dwarfstring_append', 'match_buildid', 'free', '_dwarf_get_suppress_debuglink_crc']

139 1689 _dwarf_debuglink_finder_newpath call site /src/libdwarf/src/lib/libdwarf/dwarf_object_detector.c:669
53 53 1 :

['apply_rela_entries']

53 53 elf_relocations_nolibelf call site /src/libdwarf/src/lib/libdwarf/dwarf_elfread.c:475
16 16 1 :

['_dwarfstring_append_spaces']

18 42 dwarfstring_append_printf_s call site /src/libdwarf/src/lib/libdwarf/dwarf_string.c:324
4 69 2 :

['close', 'dwarf_object_detector_fd']

4 69 dwarf_object_detector_path_dSYM call site /src/libdwarf/src/lib/libdwarf/dwarf_object_detector.c:576
3 3 1 :

['allocate_ts_entry']

3 3 tsearch_inner call site /src/libdwarf/src/lib/libdwarf/dwarf_tsearchhash.c:479
2 2 1 :

['fclose']

2 350 _dwarf_free_all_of_one_debug call site /src/libdwarf/src/lib/libdwarf/dwarf_alloc.c:1076
2 2 1 :

['close']

2 2 _dwarf_destruct_macho_access call site /src/libdwarf/src/lib/libdwarf/dwarf_machoread.c:241
2 2 1 :

['close']

2 2 dwarf_object_detector_path_b call site /src/libdwarf/src/lib/libdwarf/dwarf_object_detector.c:892
2 2 1 :

['close']

2 2 _dwarf_destruct_pe_access call site /src/libdwarf/src/lib/libdwarf/dwarf_peread.c:462
0 106 1 :

['_dwarf_error']

0 106 dwarf_get_xu_index_header call site /src/libdwarf/src/lib/libdwarf/dwarf_xu_index.c:382
0 17 1 :

['dwarfstring_append']

0 33 transform_leading_windowsletter call site /src/libdwarf/src/lib/libdwarf/dwarf_debuglink.c:207
0 11 1 :

['_dwarf_tdestroy']

0 11 _dwarf_free_all_of_one_debug call site /src/libdwarf/src/lib/libdwarf/dwarf_alloc.c:1132

Runtime coverage analysis

Covered functions
210
Functions that are reachable but not covered
31
Reachable functions
219
Percentage of reachable functions covered
85.84%
NB: The sum of covered functions and functions that are reachable but not covered need not be equal to Reachable functions . This is because the reachability analysis is an approximation and thus at runtime some functions may be covered that are not included in the reachability analysis. This is a limitation of our static analysis capabilities.
Function name source code lines source lines hit percentage hit

Files reached

filename functions hit
/src/fuzz_init_path.c 1
dwarf_generic_init.c 6
dwarf_error.c 5
dwarf_alloc.c 15
dwarf_tsearchhash.c 12
dwarf_string.c 13
dwarf_object_detector.c 16
dwarf_object_read_common.c 1
dwarf_memcpy_swap.c 2
dwarf_debuglink.c 20
dwarf_elfread.c 4
dwarf_machoread.c 15
dwarf_peread.c 13
dwarf_init_finish.c 19
dwarf_harmless.c 2
dwarf_xu_index.c 3
dwarf_util.c 2
dwarf_rnglists.c 1
dwarf_loclists.c 1
dwarf_groups.c 10
dwarf_tied.c 1
dwarf_safe_strcpy.c 1
dwarf_crc32.c 1
dwarf_crc.c 1
dwarf_elf_load_headers.c 35

Analyses and suggestions

Optimal target analysis

Remaining optimal interesting functions

The following table shows a list of functions that are optimal targets. Optimal targets are identified by finding the functions that in combination, yield a high code coverage.

Func name Functions filename Arg count Args Function depth hitcount instr count bb count cyclomatic complexity Reachable functions Incoming references total cyclomatic complexity Unreached complexity
dwarf_get_loclist_c /src/libdwarf/src/lib/libdwarf/dwarf_loc.c 4 ['struct.Dwarf_Attribute_s *', 'struct.Dwarf_Loc_Head_c_s **', 'size_t *', 'struct.Dwarf_Error_s **'] 18 0 460 47 20 203 0 2399 2098
dwarf_get_macro_context_by_offset /src/libdwarf/src/lib/libdwarf/dwarf_macro5.c 7 ['struct.Dwarf_Die_s *', 'size_t ', 'size_t *', 'struct.Dwarf_Macro_Context_s **', 'size_t *', 'size_t *', 'struct.Dwarf_Error_s **'] 19 0 52 3 2 202 0 1978 522
dwarf_get_pubtypes /src/libdwarf/src/lib/libdwarf/dwarf_global.c 4 ['struct.Dwarf_Debug_s *', 'struct.Dwarf_Global_s ***', 'size_t *', 'struct.Dwarf_Error_s **'] 6 0 33 3 2 93 0 901 381
dwarf_get_fde_info_for_reg3_b /src/libdwarf/src/lib/libdwarf/dwarf_frame.c 12 ['struct.Dwarf_Fde_s *', 'N/A', 'size_t ', 'char *', 'size_t *', 'size_t *', 'size_t *', 'struct.Dwarf_Block_s *', 'size_t *', 'int *', 'size_t *', 'struct.Dwarf_Error_s **'] 5 0 327 39 15 45 0 454 211
dwarf_get_fde_list /src/libdwarf/src/lib/libdwarf/dwarf_frame.c 6 ['struct.Dwarf_Debug_s *', 'struct.Dwarf_Cie_s ***', 'size_t *', 'struct.Dwarf_Fde_s ***', 'size_t *', 'struct.Dwarf_Error_s **'] 5 0 97 11 5 66 0 534 204
dwarf_srclines_b /src/libdwarf/src/lib/libdwarf/dwarf_line.c 5 ['struct.Dwarf_Die_s *', 'size_t *', 'char *', 'struct.Dwarf_Line_Context_s **', 'struct.Dwarf_Error_s **'] 17 0 106 12 5 190 0 1937 183
dwarf_get_gnu_index_head /src/libdwarf/src/lib/libdwarf/dwarf_gnu_index.c 5 ['struct.Dwarf_Debug_s *', 'int ', 'struct.Dwarf_Gnu_Index_Head_s **', 'size_t *', 'struct.Dwarf_Error_s **'] 4 0 262 24 11 56 0 466 90
elf_relocations_nolibelf /src/libdwarf/src/lib/libdwarf/dwarf_elfread.c 4 ['char *', 'N/A', 'struct.Dwarf_Debug_s *', 'int *'] 2 0 131 17 8 5 0 88 88
dwarf_highpc_b /src/libdwarf/src/lib/libdwarf/dwarf_query.c 5 ['struct.Dwarf_Die_s *', 'size_t *', 'N/A', 'int *', 'struct.Dwarf_Error_s **'] 17 0 431 55 21 169 0 1558 70
dwarf_rnglists_get_rle_head /src/libdwarf/src/lib/libdwarf/dwarf_rnglists.c 7 ['struct.Dwarf_Attribute_s *', 'N/A', 'size_t ', 'struct.Dwarf_Rnglists_Head_s **', 'size_t *', 'size_t *', 'struct.Dwarf_Error_s **'] 16 0 477 41 16 167 0 1490 56

Implementing fuzzers that target the above functions will improve reachability such that it becomes:

Functions statically reachable by fuzzers
65.03%
504/775
Cyclomatic complexity statically reachable by fuzzers
72.64%
5410 / 7448

All functions overview

If you implement fuzzers for these functions, the status of all functions in the project will be:

Func name Functions filename Args Function call depth Reached by Fuzzers Fuzzers runtime hit Func lines hit % I Count BB Count Cyclomatic complexity Functions reached Reached by functions Accumulated cyclomatic complexity Undiscovered complexity

Files and Directories in report

This section shows which files and directories are considered in this report. The main reason for showing this is fuzz introspector may include more code in the reasoning than is desired. This section helps identify if too many files/directories are included, e.g. third party code, which may be irrelevant for the threat model. In the event too much is included, fuzz introspector supports a configuration file that can exclude data from the report. See the following link for more information on how to create a config file: link

Files in report

Source file Reached by Covered by
[] []
/src/libdwarf/src/lib/libdwarf/dwarf_safe_strcpy.c ['fuzz_init_binary', 'fuzz_init_path'] ['fuzz_init_binary', 'fuzz_init_path']
/src/libdwarf/src/lib/libdwarf/dwarf_object_detector.c ['fuzz_init_binary', 'fuzz_init_path'] ['fuzz_init_binary', 'fuzz_init_path']
/src/libdwarf/src/lib/libdwarf/dwarf_find_sigref.c [] []
/src/libdwarf/src/lib/libdwarf/dwarf_loclists.c ['fuzz_init_binary', 'fuzz_init_path'] ['fuzz_init_binary', 'fuzz_init_path']
/src/libdwarf/src/lib/libdwarf/dwarf_string.c ['fuzz_init_binary', 'fuzz_init_path'] ['fuzz_init_binary', 'fuzz_init_path']
/src/libdwarf/src/lib/libdwarf/dwarf_elfread.c ['fuzz_init_binary', 'fuzz_init_path'] ['fuzz_init_binary', 'fuzz_init_path']
/src/libdwarf/src/lib/libdwarf/dwarf_object_read_common.c ['fuzz_init_binary', 'fuzz_init_path'] ['fuzz_init_binary', 'fuzz_init_path']
/src/libdwarf/src/lib/libdwarf/dwarf_names.c [] []
/src/libdwarf/src/lib/libdwarf/dwarf_dsc.c [] []
/src/libdwarf/src/lib/libdwarf/dwarf_peread.c ['fuzz_init_binary', 'fuzz_init_path'] ['fuzz_init_binary', 'fuzz_init_path']
/src/libdwarf/src/lib/libdwarf/dwarf_debuglink.c ['fuzz_init_binary', 'fuzz_init_path'] ['fuzz_init_binary', 'fuzz_init_path']
/src/libdwarf/src/lib/libdwarf/dwarf_error.c ['fuzz_init_binary', 'fuzz_init_path'] ['fuzz_init_binary', 'fuzz_init_path']
/src/libdwarf/src/lib/libdwarf/dwarf_locationop_read.c [] []
/src/libdwarf/src/lib/libdwarf/dwarf_frame2.c [] []
/src/libdwarf/src/lib/libdwarf/dwarf_loc.c [] []
/src/libdwarf/src/lib/libdwarf/dwarf_macro5.c [] []
/src/libdwarf/src/lib/libdwarf/dwarf_line.c [] []
/src/libdwarf/src/lib/libdwarf/dwarf_tsearchhash.c ['fuzz_init_binary', 'fuzz_init_path'] ['fuzz_init_binary', 'fuzz_init_path']
/src/libdwarf/src/lib/libdwarf/dwarf_global.c [] []
/src/libdwarf/src/lib/libdwarf/dwarf_elf_rel_detector.c [] []
/src/libdwarf/src/lib/libdwarf/dwarf_fill_in_attr_form.c [] []
/src/libdwarf/src/lib/libdwarf/dwarf_gnu_index.c [] []
/src/libdwarf/src/lib/libdwarf/dwarf_str_offsets.c [] []
/src/libdwarf/src/lib/libdwarf/dwarf_frame.c [] []
/src/libdwarf/src/lib/libdwarf/dwarf_harmless.c ['fuzz_init_binary', 'fuzz_init_path'] ['fuzz_init_binary', 'fuzz_init_path']
/src/libdwarf/src/lib/libdwarf/dwarf_leb.c [] []
/src/libdwarf/src/lib/libdwarf/dwarf_elf_load_headers.c ['fuzz_init_binary', 'fuzz_init_path'] ['fuzz_init_binary', 'fuzz_init_path']
/src/libdwarf/src/lib/libdwarf/dwarf_abbrev.c [] []
/src/fuzz_init_path.c ['fuzz_init_path'] ['fuzz_init_path']
/src/fuzz_init_binary.c ['fuzz_init_binary'] ['fuzz_init_binary']
/src/libdwarf/src/lib/libdwarf/dwarf_fission_to_cu.c [] []
/src/libdwarf/src/lib/libdwarf/dwarf_groups.c ['fuzz_init_binary', 'fuzz_init_path'] ['fuzz_init_binary', 'fuzz_init_path']
/src/libdwarf/src/lib/libdwarf/dwarf_line_table_reader_common.h [] []
/src/libdwarf/src/lib/libdwarf/dwarf_machoread.c ['fuzz_init_binary', 'fuzz_init_path'] ['fuzz_init_binary', 'fuzz_init_path']
/src/libdwarf/src/lib/libdwarf/dwarf_form.c [] []
/src/libdwarf/src/lib/libdwarf/dwarf_util.c ['fuzz_init_binary', 'fuzz_init_path'] ['fuzz_init_path']
/src/libdwarf/src/lib/libdwarf/dwarf_generic_init.c ['fuzz_init_binary', 'fuzz_init_path'] ['fuzz_init_binary', 'fuzz_init_path']
/src/libdwarf/src/lib/libdwarf/dwarf_tied.c ['fuzz_init_binary', 'fuzz_init_path'] []
/src/libdwarf/src/lib/libdwarf/dwarf_xu_index.c ['fuzz_init_binary', 'fuzz_init_path'] ['fuzz_init_binary', 'fuzz_init_path']
/src/libdwarf/src/lib/libdwarf/dwarf_alloc.c ['fuzz_init_binary', 'fuzz_init_path'] ['fuzz_init_binary', 'fuzz_init_path']
/src/libdwarf/src/lib/libdwarf/dwarf_memcpy_swap.c ['fuzz_init_binary', 'fuzz_init_path'] ['fuzz_init_binary', 'fuzz_init_path']
/src/libdwarf/src/lib/libdwarf/dwarf_crc.c ['fuzz_init_path'] []
/src/libdwarf/src/lib/libdwarf/dwarf_die_deliv.c [] []
/src/libdwarf/src/lib/libdwarf/dwarf_query.c [] []
/src/libdwarf/src/lib/libdwarf/dwarf_rnglists.c ['fuzz_init_binary', 'fuzz_init_path'] ['fuzz_init_binary', 'fuzz_init_path']
/src/libdwarf/src/lib/libdwarf/dwarf_init_finish.c ['fuzz_init_binary', 'fuzz_init_path'] ['fuzz_init_binary', 'fuzz_init_path']
/src/libdwarf/src/lib/libdwarf/dwarf_crc32.c ['fuzz_init_path'] []
/src/libdwarf/src/lib/libdwarf/dwarf_debugnames.c [] []

Directories in report

Directory
/src/
/src/libdwarf/src/lib/libdwarf/