[Bug binutils/21151] New: Heap buffer overflow in drwarf2.c

[thuanpv at comp dot nus.edu.sg]

https://sourceware.org/bugzilla/show_bug.cgi?id=21151

            Bug ID: 21151
           Summary: Heap buffer overflow in drwarf2.c
           Product: binutils
           Version: 2.29 (HEAD)
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: thuanpv at comp dot nus.edu.sg
  Target Milestone: ---

Created attachment 9819
  --> https://sourceware.org/bugzilla/attachment.cgi?id=9819&action=edit
Bug triggering input

Dear all,

This bug was found with AFLGo, a directed version of AFL/AFLFast. Thanks also
to Marcel Böhme. 

This bug was found on Ubuntu 14.04 64-bit & binutils was checkout from main
repository at git://sourceware.org/git/binutils-gdb.git. Its commit is
53f7e8ea7fad1fcff1b58f4cbd74e192e0bcbc1d (Fri Feb 10 00:00:16 2017) 

binutils was built with ASAN using gcc-6.2 and clang-3.4. The configure command
was:

CC=clang CFLAGS="-DFORTIFY_SOURCE=2 -fstack-protector-all
-fsanitize=undefined,address -fno-omit-frame-pointer -g -Wno-error"
../configure --disable-shared --disable-gdb --disable-libdecnumber
--disable-readline --disable-sim

To reproduce:
Download the attached file - bug_17
objdump -S bug_17


ASAN says:
==107235==ERROR: AddressSanitizer: heap-buffer-overflow on address
0x60800000bf72 at pc 0x10b6f9e bp 0x7ffd0f6e24f0 sp 0x7ffd0f6e24e8
READ of size 1 at 0x60800000bf72 thread T0
    #0 0x10b6f9d in read_1_byte
/home/ubuntu/thesis/subjects/binutils-newest/build-asan/bfd/../../bfd/dwarf2.c:573
    #1 0x10accd0 in parse_comp_unit
/home/ubuntu/thesis/subjects/binutils-newest/build-asan/bfd/../../bfd/dwarf2.c:2970
    #2 0x10a17df in _bfd_dwarf2_find_nearest_line
/home/ubuntu/thesis/subjects/binutils-newest/build-asan/bfd/../../bfd/dwarf2.c:4297
    #3 0xcc0b5a in _bfd_elf_find_nearest_line
/home/ubuntu/thesis/subjects/binutils-newest/build-asan/bfd/../../bfd/elf.c:8554
    #4 0x4d306f in show_line
/home/ubuntu/thesis/subjects/binutils-newest/build-asan/binutils/../../binutils/objdump.c:1472
    #5 0x4c8043 in disassemble_bytes
/home/ubuntu/thesis/subjects/binutils-newest/build-asan/binutils/../../binutils/objdump.c:1766
    #6 0x4b80e2 in disassemble_section
/home/ubuntu/thesis/subjects/binutils-newest/build-asan/binutils/../../binutils/objdump.c:2279
    #7 0x999603 in bfd_map_over_sections
/home/ubuntu/thesis/subjects/binutils-newest/build-asan/bfd/../../bfd/section.c:1395
    #8 0x4a63eb in disassemble_data
/home/ubuntu/thesis/subjects/binutils-newest/build-asan/binutils/../../binutils/objdump.c:2413
    #9 0x498f1f in dump_bfd
/home/ubuntu/thesis/subjects/binutils-newest/build-asan/binutils/../../binutils/objdump.c:3507
    #10 0x4978fb in display_object_bfd
/home/ubuntu/thesis/subjects/binutils-newest/build-asan/binutils/../../binutils/objdump.c:3564
    #11 0x497698 in display_any_bfd
/home/ubuntu/thesis/subjects/binutils-newest/build-asan/binutils/../../binutils/objdump.c:3653
    #12 0x495ebe in display_file
/home/ubuntu/thesis/subjects/binutils-newest/build-asan/binutils/../../binutils/objdump.c:3674
    #13 0x493edd in main
/home/ubuntu/thesis/subjects/binutils-newest/build-asan/binutils/../../binutils/objdump.c:3969
    #14 0x7f5fdb405f44 (/lib/x86_64-linux-gnu/libc.so.6+0x21f44)
    #15 0x48c95c in _start
(/home/ubuntu/thesis/subjects/binutils-newest/build-asan/binutils/objdump+0x48c95c)

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