https://sourceware.org/bugzilla/show_bug.cgi?id=28666
Bug ID: 28666
Summary: memmove() reads out-of-range in elf32_xlatetom
Product: elfutils
Version: unspecified
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: libelf
Assignee: unassigned at sourceware dot org
Reporter: netfirewall at gmail dot com
CC: elfutils-devel at sourceware dot org
Target Milestone: ---
Created attachment 13829
--> https://sourceware.org/bugzilla/attachment.cgi?id=13829&action=edit
poc1
Hi,
A memmove() reads out-of-range was triggered when we were fuzzing the elfutils.
The same issue can be triggered in the release version 0.186 and the upstream
version.
We fuzzed with a modified oss-fuzz, so it can be reproduced with oss-fuzz
steup. Here are the steps to reproduce (poc1 is attached):
> 1. git clone https://github.com/google/oss-fuzz.git
> 2. cd oss-fuzz
> 3. python3 infra/helper.py build_fuzzers --engine libfuzzer --sanitizer
> address elfutils
> 4. python3 infra/helper.py reproduce elfutils fuzz-dwfl-core ./poc1
The same payload also crashes the release 0.186 (commit
983e86fd89e8bf02f2d27ba5dce5bf078af4ceda). To reproduce on 0.186, edit
oss-fuzz/projects/elfutils/Dockerfile as below, and follow the same steps
above.
> FROM gcr.io/oss-fuzz-base/base-builder
> RUN apt-get update && \
> apt-get install -y pkg-config make autoconf autopoint zlib1g-dev flex
> bison gawk
> RUN git clone git://sourceware.org/git/elfutils.git
> WORKDIR elfutils
> RUN git checkout 983e86fd89e8bf02f2d27ba5dce5bf078af4ceda
> COPY build.sh *.c *.zip $SRC/
Here is the ASAN dump (upstream, commit
66f704ae705a489d35cd03aa9687e192a844d766):
> ==13==ERROR: AddressSanitizer: unknown-crash on address 0x7fab2f62e000 at pc
> 0x00000052487f bp 0x7ffe9c2ec120 sp 0x7ffe9c2eb8e8[35/1970]
> READ of size 1790976 at 0x7fab2f62e000 thread T0
>
> SCARINESS: 16 (multi-byte-read-unknown-crash)
>
> #0 0x52487e in __asan_memmove
> /src/llvm-project/compiler-rt/lib/asan/asan_interceptors_memintrinsics.cpp:30:3
>
> #1 0x63ca73 in memmove
> /usr/include/x86_64-linux-gnu/bits/string_fortified.h:40:10
>
> #2 0x63ca73 in elf32_xlatetom /src/elfutils/libelf/elf32_xlatetom.c:96:2
>
> #3 0x5fc040 in dwfl_link_map_report
> /src/elfutils/libdwfl/link_map.c:895:12
>
> #4 0x56631a in dwfl_core_file_report
> /src/elfutils/libdwfl/core-file.c:548:16
>
> #5 0x55e4e0 in LLVMFuzzerTestOneInput /src/fuzz-dwfl-core.c:52:6
>
> #6 0x456cb3 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*,
> unsigned long) cxa_noexception.cpp
> #7 0x4425b2 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned
> long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver
> .cpp:324:6
>
> #8 0x44807a in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char
> const*, unsigned long)) cxa_noexception.cpp
> #9 0x470f62 in main
> /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20:10
>
> #10 0x7fab304800b2 in __libc_start_main
> (/lib/x86_64-linux-gnu/libc.so.6+0x270b2)
>
> #11 0x41f83d in _start (/out/fuzz-dwfl-core+0x41f83d)
>
>
>
> DEDUP_TOKEN: __asan_memmove--memmove--elf32_xlatetom
>
> Address 0x7fab2f62e000 is a wild pointer inside of access range of size
> 0x0000001b5400.
> SUMMARY: AddressSanitizer: unknown-crash
> /src/llvm-project/compiler-rt/lib/asan/asan_interceptors_memintrinsics.cpp:30:3
> in __asan_memmo
> ve
>
> Shadow bytes around the buggy address:
>
> 0x0ff5e5ebdbb0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>
> 0x0ff5e5ebdbc0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>
> 0x0ff5e5ebdbd0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>
> 0x0ff5e5ebdbe0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>
> 0x0ff5e5ebdbf0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>
> =>0x0ff5e5ebdc00:[fe]fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
>
> 0x0ff5e5ebdc10: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
>
> 0x0ff5e5ebdc20: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
> 0x0ff5e5ebdc30: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
> 0x0ff5e5ebdc40: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
> 0x0ff5e5ebdc50: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
> 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
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