Created attachment 12459 [details] PoC for null pointer dereferencing in addr2line Hi, A null pointer dereferencing was discovered in addr2line (the latest commit 95a5156) in scan_unit_for_symbols(), that can cause a denial of service via a crafted file. To reproduce: addr2line s -e PoC ASAN says: ==16618==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x7fd509971746 bp 0x7ffd51517970 sp 0x7ffd515170f8 T0) #0 0x7fd509971745 in strlen (/lib/x86_64-linux-gnu/libc.so.6+0x8b745) #1 0x7fd509f161f8 in strdup (/usr/lib/x86_64-linux-gnu/libasan.so.2+0x621f8) #2 0x546284 in scan_unit_for_symbols ../../bfd/dwarf2.c:3394 #3 0x547ef6 in comp_unit_maybe_decode_line_info ../../bfd/dwarf2.c:3810 #4 0x547b63 in comp_unit_find_nearest_line ../../bfd/dwarf2.c:3769 #5 0x54d5e2 in _bfd_dwarf2_find_nearest_line ../../bfd/dwarf2.c:5040 #6 0x4b973c in _bfd_elf_find_nearest_line ../../bfd/elf.c:9133 #7 0x4035ea in find_address_in_section ../../binutils/addr2line.c:196 #8 0x421a3e in bfd_map_over_sections ../../bfd/section.c:1377 #9 0x403ae0 in translate_addresses ../../binutils/addr2line.c:274 #10 0x40412e in process_file ../../binutils/addr2line.c:411 #11 0x40460a in main ../../binutils/addr2line.c:525 #12 0x7fd50990682f in __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x2082f) #13 0x402d98 in _start (/home/dungnguyen/PoCs/binutils_f717994/addr2line+0x402d98) Thanks, Manh Dung
The master branch has been updated by Alan Modra <amodra@sourceware.org>: https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=aec72fda3b320c36eb99fc1c4cf95b10fc026729 commit aec72fda3b320c36eb99fc1c4cf95b10fc026729 Author: Alan Modra <amodra@gmail.com> Date: Thu Apr 16 17:49:38 2020 +0930 PR25827, Null pointer dereferencing in scan_unit_for_symbols PR 25827 * dwarf2.c (scan_unit_for_symbols): Wrap overlong lines. Don't strdup(0).
Fixed.