https://sourceware.org/bugzilla/show_bug.cgi?id=24140
Bug ID: 24140 Summary: A Heap-buffer-overflow problem was discovered in the function __libdw_next_unit in dwarf_nextcu.c in libdw Product: elfutils Version: unspecified Status: UNCONFIRMED Severity: critical Priority: P2 Component: libdw Assignee: unassigned at sourceware dot org Reporter: wcventure at 126 dot com CC: elfutils-devel at sourceware dot org Target Milestone: --- Created attachment 11574 --> https://sourceware.org/bugzilla/attachment.cgi?id=11574&action=edit POC Hi, A Heap-buffer-overflow problem was discovered in the function __libdw_next_unit in dwarf_nextcu.c in libdw, as distributed in Elfutils 0.175. A crafted ELF input can cause segment faults and I have confirmed them with address sanitizer too. Here are the POC files. Please use "./eu-nm -C $POC" to reproduce the error. $git log > commit a17c2c0917901ffa542ac4d3e327d46742219e04 > Author: Mark Wielaard <m...@klomp.org> > Date: Tue Jan 22 15:55:18 2019 +0100 > > readelf: Don't go past end of line data reading unknown opcode parameters. > > https://sourceware.org/bugzilla/show_bug.cgi?id=24116 > > Signed-off-by: Mark Wielaard <m...@klomp.org> The ASAN dumps the stack trace as follows: > ================================================================= > ==12766==ERROR: AddressSanitizer: heap-buffer-overflow on address > 0x603000000032 at pc 0x7f1605a83c52 bp 0x7ffeba226910 sp 0x7ffeba226900 > READ of size 2 at 0x603000000032 thread T0 > #0 0x7f1605a83c51 in __libdw_next_unit > /home/wencheng/Experiment/elfutils/libdw/dwarf_nextcu.c:249 > #1 0x7f1605a83f3c in dwarf_next_unit > /home/wencheng/Experiment/elfutils/libdw/dwarf_nextcu.c:46 > #2 0x7f1605a83f3c in dwarf_nextcu > /home/wencheng/Experiment/elfutils/libdw/dwarf_nextcu.c:294 > #3 0x408273 in get_local_names > /home/wencheng/Experiment/elfutils/src/nm.c:627 > #4 0x408273 in show_symbols > /home/wencheng/Experiment/elfutils/src/nm.c:1285 > #5 0x40e5bd in handle_elf /home/wencheng/Experiment/elfutils/src/nm.c:1578 > #6 0x40387c in process_file > /home/wencheng/Experiment/elfutils/src/nm.c:374 > #7 0x40387c in main /home/wencheng/Experiment/elfutils/src/nm.c:249 > #8 0x7f1604e6782f in __libc_start_main > (/lib/x86_64-linux-gnu/libc.so.6+0x2082f) > #9 0x404568 in _start > (/home/wencheng/Experiment/elfutils/build/bin/eu-nm+0x404568) > > 0x603000000032 is located 2 bytes to the right of 32-byte region > [0x603000000010,0x603000000030) > allocated by thread T0 here: > #0 0x7f1605f4ab90 in __interceptor_malloc > (/usr/lib/x86_64-linux-gnu/libasan.so.4+0xdeb90) > #1 0x7f16057feec3 in convert_data > /home/wencheng/Experiment/elfutils/libelf/elf_getdata.c:157 > #2 0x7f16057feec3 in __libelf_set_data_list_rdlock > /home/wencheng/Experiment/elfutils/libelf/elf_getdata.c:447 > > SUMMARY: AddressSanitizer: heap-buffer-overflow > /home/wencheng/Experiment/elfutils/libdw/dwarf_nextcu.c:249 in > __libdw_next_unit > Shadow bytes around the buggy address: > 0x0c067fff7fb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > 0x0c067fff7fc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > 0x0c067fff7fd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > 0x0c067fff7fe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > 0x0c067fff7ff0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > =>0x0c067fff8000: fa fa 00 00 00 00[fa]fa fa fa fa fa fa fa fa fa > 0x0c067fff8010: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa > 0x0c067fff8020: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa > 0x0c067fff8030: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa > 0x0c067fff8040: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa > 0x0c067fff8050: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa > Shadow byte legend (one shadow byte represents 8 application bytes): > Addressable: 00 > Partially addressable: 01 02 03 04 05 06 07 > Heap left redzone: fa > Freed heap region: fd > Stack left redzone: f1 > Stack mid redzone: f2 > Stack right redzone: f3 > Stack after return: f5 > Stack use after scope: f8 > Global redzone: f9 > Global init order: f6 > Poisoned by user: f7 > Container overflow: fc > Array cookie: ac > Intra object redzone: bb > ASan internal: fe > Left alloca redzone: ca > Right alloca redzone: cb > ==12766==ABORTING -- You are receiving this mail because: You are on the CC list for the bug.