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[Bug binutils/28662] New: use-of-uninitialized-value in dwarf2.c:read_ra


From: shaohua.li at inf dot ethz.ch
Subject: [Bug binutils/28662] New: use-of-uninitialized-value in dwarf2.c:read_ranges
Date: Mon, 06 Dec 2021 15:18:33 +0000

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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