https://sourceware.org/bugzilla/show_bug.cgi?id=28659
Bug ID: 28659
Summary: UBSan seems to complain about an "integer overflow" in
dwfl_segment_report_module
Product: elfutils
Version: unspecified
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: libdw
Assignee: unassigned at sourceware dot org
Reporter: evvers at ya dot ru
CC: elfutils-devel at sourceware dot org
Target Milestone: ---
Created attachment 13825
--> https://sourceware.org/bugzilla/attachment.cgi?id=13825&action=edit
File triggering an integer overflow
One of systemd fuzz targets run under UBSan discovered an "integer-overflow".
It can be reproduced by building the master branch of the elfutils repository
with UBSan and passing the attachment to `./src/stack`:
```
$ git describe
elfutils-0.186-7-g99782bd2
autoreconf -i -f
./configure --enable-maintainer-mode CFLAGS='-g -O1 -fno-omit-frame-pointer'
--enable-sanitize-undefined
make -j$(nproc) V=1
LD_PRELOAD="./libelf/libelf.so ./libdw/libdw.so"
UBSAN_OPTIONS=print_stacktrace=1:print_summary=1 ./src/stack --core
../oss-fuzz-41570
dwfl_segment_report_module.c:400:55: runtime error: signed integer overflow:
65535 * 65312 cannot be represented in type 'int'
#0 0x7f48c29c057e in dwfl_segment_report_module
/home/vagrant/elfutils/libdwfl/dwfl_segment_report_module.c:400
#1 0x7f48c29c7656 in _new.dwfl_core_file_report
/home/vagrant/elfutils/libdwfl/core-file.c:559
#2 0x402b0f in parse_opt /home/vagrant/elfutils/src/stack.c:595
#3 0x7f48c1c42f81 in __argp_parse (/lib64/libc.so.6+0x10cf81)
#4 0x403d98 in main /home/vagrant/elfutils/src/stack.c:695
#5 0x7f48c1b5db74 in __libc_start_main (/lib64/libc.so.6+0x27b74)
#6 0x4024cd in _start (/home/vagrant/elfutils/src/stack+0x4024cd)
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
dwfl_segment_report_module.c:400:55 in
```
It was also reported in
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=41570
```
Running:
/mnt/scratch0/clusterfuzz/bot/inputs/fuzzer-testcases/crash-4613ca6be3014e2d8019781ba5061e2ebaad886f
dwfl_segment_report_module.c:400:55: runtime error: signed integer overflow:
65535 * 65312 cannot be represented in type 'int'
#0 0x51915d in dwfl_segment_report_module
/src/elfutils/libdwfl/dwfl_segment_report_module.c:400:55
#1 0x4b86e7 in dwfl_core_file_report
/src/elfutils/libdwfl/core-file.c:559:17
#2 0x4b363e in LLVMFuzzerTestOneInput /src/fuzz-dwfl-core.c:52:6
#3 0x43f1b3 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*,
unsigned long) cxa_noexception.cpp:0
#4 0x42aac2 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned
long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:324:6
#5 0x43058a in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char
const*, unsigned long)) cxa_noexception.cpp:0
#6 0x4594b2 in main
/src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20:10
#7 0x7f0cfd13e0b2 in __libc_start_main
/build/glibc-eX1tMB/glibc-2.31/csu/libc-start.c:308:16
#8 0x407d4d in _start
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior
dwfl_segment_report_module.c:400:55 in
```
--
You are receiving this mail because:
You are on the CC list for the bug.
