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| author | Alan Modra <amodra@gmail.com> | 2023-04-19 23:16:47 +0930 |
|---|---|---|
| committer | Alan Modra <amodra@gmail.com> | 2023-04-20 09:03:53 +0930 |
| commit | 329dd2b6fcad4b3f1c4b0d443381f7c68ef18a9f (patch) | |
| tree | 94b26ed119aad030db011e3a58711a7e928c1740 | |
| parent | 3b37f0f1b86cc1fb3ba9cc6d89695109db7f829a (diff) | |
| download | gdb-329dd2b6fcad4b3f1c4b0d443381f7c68ef18a9f.zip gdb-329dd2b6fcad4b3f1c4b0d443381f7c68ef18a9f.tar.gz gdb-329dd2b6fcad4b3f1c4b0d443381f7c68ef18a9f.tar.bz2 | |
ubsan: signed integer overflow in display_debug_lines_raw
This one was caused by me unnecessarily promoting an "int adv" to
"int64_t adv". The expression overflowing was 4259 + 9223372036854775807
with the left number being unsigned int.
* dwarf.h (DWARF2_Internal_LineInfo): Replace unsigned short
with uint16_t and unsigned char with uint8_t. Make li_line_base
an int8_t.
* dwarf.c (display_debug_lines_raw): Revert "adv" back to an int.
| -rw-r--r-- | binutils/dwarf.c | 8 | ||||
| -rw-r--r-- | binutils/dwarf.h | 25 |
2 files changed, 17 insertions, 16 deletions
diff --git a/binutils/dwarf.c b/binutils/dwarf.c index 1001a11..8a20bf2 100644 --- a/binutils/dwarf.c +++ b/binutils/dwarf.c @@ -4670,7 +4670,7 @@ display_debug_lines_raw (struct dwarf_section * section, while (data < end_of_sequence) { unsigned char op_code; - int64_t adv; + int adv; uint64_t uladv; printf (" [0x%08tx]", data - start); @@ -4717,7 +4717,7 @@ display_debug_lines_raw (struct dwarf_section * section, } adv = (op_code % linfo.li_line_range) + linfo.li_line_base; state_machine_regs.line += adv; - printf (_(" and Line by %" PRId64 " to %d"), + printf (_(" and Line by %d to %d"), adv, state_machine_regs.line); if (verbose_view || state_machine_regs.view) printf (_(" (view %u)\n"), state_machine_regs.view); @@ -4782,7 +4782,7 @@ display_debug_lines_raw (struct dwarf_section * section, case DW_LNS_advance_line: READ_SLEB (adv, data, end); state_machine_regs.line += adv; - printf (_(" Advance Line by %" PRId64 " to %d\n"), + printf (_(" Advance Line by %d to %d\n"), adv, state_machine_regs.line); break; @@ -4802,7 +4802,7 @@ display_debug_lines_raw (struct dwarf_section * section, case DW_LNS_negate_stmt: adv = state_machine_regs.is_stmt; adv = ! adv; - printf (_(" Set is_stmt to %" PRId64 "\n"), adv); + printf (_(" Set is_stmt to %d\n"), adv); state_machine_regs.is_stmt = adv; break; diff --git a/binutils/dwarf.h b/binutils/dwarf.h index 38fb6b7..d2f9523 100644 --- a/binutils/dwarf.h +++ b/binutils/dwarf.h @@ -23,18 +23,19 @@ /* Structure found in the .debug_line section. */ typedef struct { - uint64_t li_length; - unsigned short li_version; - unsigned char li_address_size; - unsigned char li_segment_size; - uint64_t 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; - unsigned int li_offset_size; + uint64_t li_length; + uint16_t li_version; + uint8_t li_address_size; + uint8_t li_segment_size; + uint64_t li_prologue_length; + uint8_t li_min_insn_length; + uint8_t li_max_ops_per_insn; + uint8_t li_default_is_stmt; + int8_t li_line_base; + uint8_t li_line_range; + uint8_t li_opcode_base; + /* Not part of the header. 4 for 32-bit dwarf, 8 for 64-bit. */ + unsigned int li_offset_size; } DWARF2_Internal_LineInfo; |