Created attachment 724060 [details]
00228-lrzip-fpe-bufRead-get_reproducer
Ref:
https://blogs.gentoo.org/ago/2017/05/07/lrzip-divide-by-zero-in-bufreadget-libzpaq-h/
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Description:
lrzip is a compression utility that excels at compressing large files.
The complete ASan output of the issue:
# lrzip -t $FILE
Decompressing...
ASAN:DEADLYSIGNAL
=================================================================
==8026==ERROR: AddressSanitizer: FPE on unknown address 0x0000005e7957 (pc
0x0000005e7957 bp 0x7fcdf9ba58d0 sp 0x7fcdf9ba5870 T1)
#0 0x5e7956 in bufRead::get()
/tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/libzpaq/libzpaq.h:468:41
#1 0x5856f1 in libzpaq::Decompresser::findBlock(double*)
/tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/libzpaq/libzpaq.cpp:1236:21
#2 0x55f79a in libzpaq::decompress(libzpaq::Reader*, libzpaq::Writer*)
/tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/libzpaq/libzpaq.cpp:1363:12
#3 0x55f4e2 in zpaq_decompress
/tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/libzpaq/libzpaq.h:538:2
#4 0x54b3a4 in zpaq_decompress_buf
/tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/stream.c:453:2
#5 0x54b3a4 in ucompthread
/tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/stream.c:1534
#6 0x7fd33c0594a3 in start_thread
/tmp/portage/sys-libs/glibc-2.23-r3/work/glibc-2.23/nptl/pthread_create.c:333
#7 0x7fd33b38466c in clone
/tmp/portage/sys-libs/glibc-2.23-r3/work/glibc-2.23/misc/../sysdeps/unix/sysv/linux/x86_64/clone.S:109
AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: FPE
/tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/libzpaq/libzpaq.h:468:41 in
bufRead::get()
Thread T1 created by T0 here:
#0 0x42d49d in pthread_create
/tmp/portage/sys-devel/llvm-3.9.1-r1/work/llvm-3.9.1.src/projects/compiler-rt/lib/asan/asan_interceptors.cc:245
#1 0x53e70f in create_pthread
/tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/stream.c:133:6
#2 0x53e70f in fill_buffer
/tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/stream.c:1673
#3 0x53e70f in read_stream
/tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/stream.c:1755
#4 0x5303e3 in read_u8
/tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/runzip.c:55:6
#5 0x5303e3 in read_header
/tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/runzip.c:144
#6 0x5303e3 in runzip_chunk
/tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/runzip.c:314
#7 0x5303e3 in runzip_fd
/tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/runzip.c:382
#8 0x519b41 in decompress_file
/tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/lrzip.c:826:6
#9 0x511074 in main
/tmp/portage/app-arch/lrzip-0.631/work/lrzip-0.631/main.c:669:4
#10 0x7fd33b2bd78f in __libc_start_main
/tmp/portage/sys-libs/glibc-2.23-r3/work/glibc-2.23/csu/../csu/libc-start.c:289
==8026==ABORTING
Affected version:
0.631
Fixed version:
N/A
Commit fix:
N/A
Credit:
This bug was discovered by Agostino Sarubbo of Gentoo.
CVE:
N/A
Reproducer:
https://github.com/asarubbo/poc/blob/master/00228-lrzip-fpe-bufRead-get
Timeline:
2017-03-24: bug discovered and reported to upstream
2017-05-07: blog post about the issue
Note:
This bug was found with American Fuzzy Lop.
Permalink:
lrzip: divide-by-zero in bufRead::get (libzpaq.h)
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(open-)SUSE: https://software.opensuse.org/package/lrzip
0.631 (TW, official repo)
0.621 (42.{1,2}, official repo)
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k_mikhail@linux-mk500:~> lrzip -t 00228-lrzip-fpe-bufRead-get
Decompressing...
�������������������� �� ���������������� �� ������������������ ������������ (core dumped)
k_mikhail@linux-mk500:~> lrzip --version
lrzip version 0.621
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�������������������� �� ���������������� �� ������������������ ������������ (ru) = Floating point operation
exception (en)