Created attachment 10006 [details] Crashing input Dear All, This bug was found with AFLGo, a directed version of AFL/AFLFast. Thanks also to Marcel Böhme and Van-Thuan Pham. This bug was found on Ubuntu 14.04 64-bit & binutils was checked out from main repository at git://sourceware.org/git/binutils-gdb.git. Its commit is a6c21d4a553de184562fd8409a5bcd3f2cc2561a (Wed Apr 19 13:16:05 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_7 objdump -SD bug_7 ASAN says: ==148394==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x0000010f21d7 bp 0x7ffe42ecf670 sp 0x7ffe42ece6c0 T0) #0 0x10f21d6 in _bfd_dwarf2_find_nearest_line /home/ubuntu/binutils-analysis/binutils-gdb/obj-asan/bfd/../../bfd/dwarf2.c:4212:9 #1 0xd095d9 in _bfd_elf_find_nearest_line /home/ubuntu/binutils-analysis/binutils-gdb/obj-asan/bfd/../../bfd/elf.c:8642:7 #2 0x511d79 in show_line /home/ubuntu/binutils-analysis/binutils-gdb/obj-asan/binutils/../../binutils/objdump.c:1486:9 #3 0x506b94 in disassemble_bytes /home/ubuntu/binutils-analysis/binutils-gdb/obj-asan/binutils/../../binutils/objdump.c:1791:6 #4 0x4f6b0a in disassemble_section /home/ubuntu/binutils-analysis/binutils-gdb/obj-asan/binutils/../../binutils/objdump.c:2304:7 #5 0x9e4315 in bfd_map_over_sections /home/ubuntu/binutils-analysis/binutils-gdb/obj-asan/bfd/../../bfd/section.c:1395:5 #6 0x4e4f50 in disassemble_data /home/ubuntu/binutils-analysis/binutils-gdb/obj-asan/binutils/../../binutils/objdump.c:2438:3 #7 0x4d76be in dump_bfd /home/ubuntu/binutils-analysis/binutils-gdb/obj-asan/binutils/../../binutils/objdump.c:3532:5 #8 0x4d5fe8 in display_object_bfd /home/ubuntu/binutils-analysis/binutils-gdb/obj-asan/binutils/../../binutils/objdump.c:3589:7 #9 0x4d5dcc in display_any_bfd /home/ubuntu/binutils-analysis/binutils-gdb/obj-asan/binutils/../../binutils/objdump.c:3678:5 #10 0x4d45f3 in display_file /home/ubuntu/binutils-analysis/binutils-gdb/obj-asan/binutils/../../binutils/objdump.c:3699:3 #11 0x4d26d3 in main /home/ubuntu/binutils-analysis/binutils-gdb/obj-asan/binutils/../../binutils/objdump.c:4001:6 #12 0x7fb407a88f44 in __libc_start_main /build/eglibc-oGUzwX/eglibc-2.19/csu/libc-start.c:287 #13 0x4cb13c in _start (/home/ubuntu/binutils-analysis/binutils-gdb/obj-asan/binutils/objdump+0x4cb13c) VALGRIND says: ==148401== Invalid read of size 8 ==148401== at 0x4D209A: _bfd_dwarf2_find_nearest_line (dwarf2.c:4212) ==148401== by 0x49B5EA: _bfd_elf_find_nearest_line (elf.c:8642) ==148401== by 0x4050CC: show_line (objdump.c:1486) ==148401== by 0x405B52: disassemble_bytes (objdump.c:1791) ==148401== by 0x407248: disassemble_section (objdump.c:2304) ==148401== by 0x469C57: bfd_map_over_sections (section.c:1395) ==148401== by 0x40779C: disassemble_data (objdump.c:2438) ==148401== by 0x409EA8: dump_bfd (objdump.c:3532) ==148401== by 0x40A02E: display_object_bfd (objdump.c:3589) ==148401== by 0x40A270: display_any_bfd (objdump.c:3678) ==148401== by 0x40A2E4: display_file (objdump.c:3699) ==148401== by 0x40ABB7: main (objdump.c:4001) ==148401== Address 0x0 is not stack'd, malloc'd or (recently) free'd ==148401== ==148401== ==148401== Process terminating with default action of signal 11 (SIGSEGV) ==148401== Access not within mapped region at address 0x0 ==148401== at 0x4D209A: _bfd_dwarf2_find_nearest_line (dwarf2.c:4212) ==148401== by 0x49B5EA: _bfd_elf_find_nearest_line (elf.c:8642) ==148401== by 0x4050CC: show_line (objdump.c:1486) ==148401== by 0x405B52: disassemble_bytes (objdump.c:1791) ==148401== by 0x407248: disassemble_section (objdump.c:2304) ==148401== by 0x469C57: bfd_map_over_sections (section.c:1395) ==148401== by 0x40779C: disassemble_data (objdump.c:2438) ==148401== by 0x409EA8: dump_bfd (objdump.c:3532) ==148401== by 0x40A02E: display_object_bfd (objdump.c:3589) ==148401== by 0x40A270: display_any_bfd (objdump.c:3678) ==148401== by 0x40A2E4: display_file (objdump.c:3699) ==148401== by 0x40ABB7: main (objdump.c:4001)
Created attachment 10014 [details] Another crashing input
The master branch has been updated by Alan Modra <amodra@sourceware.org>: https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=97e83a100aa8250be783304bfe0429761c6e6b6b commit 97e83a100aa8250be783304bfe0429761c6e6b6b Author: Alan Modra <amodra@gmail.com> Date: Sun Apr 23 13:55:49 2017 +0930 PR 21409, segfault in _bfd_dwarf2_find_nearest_line PR 21409 * dwarf2.c (_bfd_dwarf2_find_nearest_line): Don't segfault when no symbols.
Fixed
Thanks Alan Modra. This is CVE-2017-8392.
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