https://sourceware.org/bugzilla/show_bug.cgi?id=28166
Bug ID: 28166
Summary: objdump: null ptr dereference on
_bfd_elf_mips_get_relocated_section_contents in
elfxx-mips.c
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 13577
--> https://sourceware.org/bugzilla/attachment.cgi?id=13577&action=edit
poc
Hi there,
I found a null pointer dereference with a fuzzer. (See AddressSanitizer report
below)
- binutils version: 2.38(Head), commit af51804103a08cd1e12edc4f4a30eec2c5c4f9e8
- Compiler: clang12
- Platform: Ubuntu 18.04.5 LTS, x86_64
- Reproduce: run `objdump -S poc`
AddressSanitizer report:
==364==ERROR: AddressSanitizer: SEGV on unknown address (pc 0x000001014c7d bp
0x7ffdbfb68190 sp 0x7ffdbfb67ba0 T0)
==364==The signal is caused by a READ memory access.
==364==Hint: this fault was caused by a dereference of a high value address
(see register values below). Disassemble the provided pc to learn which
register was used.
#0 0x1014c7d in _bfd_elf_mips_get_relocated_section_contents
/binutils_latest/repo/bfd/elfxx-mips.c:13309:13
#1 0xae653f in bfd_get_relocated_section_contents
/binutils_latest/repo/bfd/bfd.c:2166:10
#2 0xb0fe68 in bfd_simple_get_relocated_section_contents
/binutils_latest/repo/bfd/simple.c:298:14
#3 0xcab59c in read_section /binutils_latest/repo/bfd/./dwarf2.c:582:7
#4 0xca8237 in _bfd_dwarf2_slurp_debug_info
/binutils_latest/repo/bfd/./dwarf2.c:4737:13
#5 0xcac7c1 in _bfd_dwarf2_find_nearest_line
/binutils_latest/repo/bfd/./dwarf2.c:4985:9
#6 0x1013734 in _bfd_mips_elf_find_nearest_line
/binutils_latest/repo/bfd/elfxx-mips.c:13061:7
#7 0x4e496a in show_line /binutils_latest/repo/binutils/./objdump.c:1784:9
#8 0x4e0b1f in disassemble_bytes
/binutils_latest/repo/binutils/./objdump.c:2770:6
#9 0x4dae9a in disassemble_section
/binutils_latest/repo/binutils/./objdump.c:3455:4
#10 0xb0e04a in bfd_map_over_sections
/binutils_latest/repo/bfd/section.c:1383:5
#11 0x4d1ae0 in disassemble_data
/binutils_latest/repo/binutils/./objdump.c:3599:3
#12 0x4cda84 in dump_bfd /binutils_latest/repo/binutils/./objdump.c:5006:5
#13 0x4ccb9f in display_object_bfd
/binutils_latest/repo/binutils/./objdump.c:5068:7
#14 0x4ccaa9 in display_any_bfd
/binutils_latest/repo/binutils/./objdump.c:5158:5
#15 0x4cc65c in display_file
/binutils_latest/repo/binutils/./objdump.c:5179:3
#16 0x4cb063 in main /binutils_latest/repo/binutils/./objdump.c:5529:6
#17 0x7ffaf8c830b2 in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x270b2)
#18 0x41c61d in _start (/out_bin/objdump+0x41c61d)
AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /binutils_latest/repo/bfd/elfxx-mips.c:13309:13
in _bfd_elf_mips_get_relocated_section_contents
==364==ABORTING
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