https://sourceware.org/bugzilla/show_bug.cgi?id=28662
Bug ID: 28662
Summary: use-of-uninitialized-value in dwarf2.c:read_ranges
Product: binutils
Version: 2.38 (HEAD)
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: shaohua.li at inf dot ethz.ch
Target Milestone: ---
Created attachment 13827
--> https://sourceware.org/bugzilla/attachment.cgi?id=13827&action=edit
uninitialize_poc
Hi there,
I found an use-of-uninitialized-value in dwarf2.c:read_ranges when I was
fuzzing `objdump -S`. A direct consequence of this issue is : If you compile
binutils with `clang -O0` and `clang -O2`, the `objdump -S` would emit
different output on the given input file.
- Compiler: clang-13
- Platform: Ubuntu 20.04.4 LTS, x86_64
- Reproduce: compile with MemorySanitizer, then run `objdump -S
uninitialize_poc`.
MemorySanitizer report:
==1956831==WARNING: MemorySanitizer: use-of-uninitialized-value
#0 0x165dba3 in read_ranges
/objdump/analysis/debug/mem/binutils-gdb/bfd/./dwarf2.c:3096:7
#1 0x165cc33 in read_rangelist
/objdump/analysis/debug/mem/binutils-gdb/bfd/./dwarf2.c:3213:12
#2 0x166c1ae in parse_comp_unit
/objdump/analysis/debug/mem/binutils-gdb/bfd/./dwarf2.c:3802:9
#3 0x1635c0a in stash_comp_unit
/objdump/analysis/debug/mem/binutils-gdb/bfd/./dwarf2.c:4832:32
#4 0x1631b5b in _bfd_dwarf2_find_nearest_line
/objdump/analysis/debug/mem/binutils-gdb/bfd/./dwarf2.c:5139:18
#5 0x1453ab5 in _bfd_elf_find_nearest_line
/objdump/analysis/debug/mem/binutils-gdb/bfd/elf.c:9205:7
#6 0x4e1bc3 in show_line
/objdump/analysis/debug/mem/binutils-gdb/binutils/./objdump.c:1922:9
#7 0x4d8703 in disassemble_bytes
/objdump/analysis/debug/mem/binutils-gdb/binutils/./objdump.c:2908:6
#8 0x4ca056 in disassemble_section
/objdump/analysis/debug/mem/binutils-gdb/binutils/./objdump.c:3593:4
#9 0x12c7b7b in bfd_map_over_sections
/objdump/analysis/debug/mem/binutils-gdb/bfd/section.c:1383:5
#10 0x4b4587 in disassemble_data
/objdump/analysis/debug/mem/binutils-gdb/binutils/./objdump.c:3737:3
#11 0x4ab3aa in dump_bfd
/objdump/analysis/debug/mem/binutils-gdb/binutils/./objdump.c:5147:5
#12 0x4a8b1d in display_object_bfd
/objdump/analysis/debug/mem/binutils-gdb/binutils/./objdump.c:5209:7
#13 0x4a8a21 in display_any_bfd
/objdump/analysis/debug/mem/binutils-gdb/binutils/./objdump.c:5299:5
#14 0x4a5dad in display_file
/objdump/analysis/debug/mem/binutils-gdb/binutils/./objdump.c:5320:3
#15 0x4a1b1d in main
/objdump/analysis/debug/mem/binutils-gdb/binutils/./objdump.c:5688:6
#16 0x7fe3f51ae0b2 in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x270b2)
#17 0x41d57d in _start
(/shared/targets/objdump/analysis/debug/mem/binutils-gdb/binutils/objdump+0x41d57d)
SUMMARY: MemorySanitizer: use-of-uninitialized-value
/objdump/analysis/debug/mem/binutils-gdb/bfd/./dwarf2.c:3096:7 in read_ranges
Exiting
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