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* [Bug libdw/28715] New: There seems to be an infinite loop in dwfl_segment_report_module
@ 2021-12-19 20:41 evvers at ya dot ru
  2021-12-20  0:44 ` [Bug libdw/28715] " mark at klomp dot org
                   ` (8 more replies)
  0 siblings, 9 replies; 10+ messages in thread
From: evvers at ya dot ru @ 2021-12-19 20:41 UTC (permalink / raw)
  To: elfutils-devel

https://sourceware.org/bugzilla/show_bug.cgi?id=28715

            Bug ID: 28715
           Summary: There seems to be an infinite loop 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 13863
  --> https://sourceware.org/bugzilla/attachment.cgi?id=13863&action=edit
File causing an infinite loop

It was reported today in
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=42645 . It can be
reproduced with `./src/stack`:
```
autoreconf -i -f
./configure --enable-maintainer-mode
make -j$(nproc) V=1
LD_LIBRARY_PATH="./libdw;./libelf" ./src/stack --core ../oss-fuzz-42645
```
According to eu-stack it's in dwfl_segment_report_module
```
PID 212089 - process
TID 212089:
#0  0x00007f6af3447cd5 dwfl_segment_report_module
#1  0x00007f6af344bf88 dwfl_core_file_report@@ELFUTILS_0.158
#2  0x0000000000402ec7 parse_opt
#3  0x00007f6af30da472 argp_parse
#4  0x00000000004024eb main
#5  0x00007f6af2fe9560 __libc_start_call_main
#6  0x00007f6af2fe960c __libc_start_main@@GLIBC_2.34
#7  0x0000000000402725 _start
```
Below is the backtrace OSS-Fuzz attached to the issue (with line numbers):
```
        ALARM: working on the last Unit for 61 seconds
       and the timeout value is 60 (use -timeout=N to change)
==822== ERROR: libFuzzer: timeout after 61 seconds
    #0 0x4b22d4 in __sanitizer_print_stack_trace
/src/llvm-project/compiler-rt/lib/ubsan/ubsan_diag_standalone.cpp:31:3
    #1 0x457438 in fuzzer::PrintStackTrace() cxa_noexception.cpp:0
    #2 0x43c329 in fuzzer::Fuzzer::AlarmCallback() cxa_noexception.cpp:0
    #3 0x7f1be648c3bf in libpthread.so.0
    #4 0x4aea5b in atomic_exchange<__sanitizer::atomic_uint32_t>
/src/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_atomic_clang.h:67:7
    #5 0x4aea5b in acquire
/src/llvm-project/compiler-rt/lib/ubsan/ubsan_value.h:60:21
    #6 0x4aea5b in handleNegateOverflowImpl(__ubsan::OverflowData*, unsigned
long, __ubsan::ReportOptions)
/src/llvm-project/compiler-rt/lib/ubsan/ubsan_handlers.cpp:251:34
    #7 0x4aea2d in __ubsan_handle_negate_overflow
/src/llvm-project/compiler-rt/lib/ubsan/ubsan_handlers.cpp:277:3
    #8 0x517854 in dwfl_segment_report_module
/src/elfutils/libdwfl/dwfl_segment_report_module.c:581:58
    #9 0x4b8937 in dwfl_core_file_report
/src/elfutils/libdwfl/core-file.c:559:17
    #10 0x4b388e in LLVMFuzzerTestOneInput /src/fuzz-dwfl-core.c:52:6
    #11 0x43d953 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*,
unsigned long) cxa_noexception.cpp:0
    #12 0x429592 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned
long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:324:6
    #13 0x42edec in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char
const*, unsigned long)) cxa_noexception.cpp:0
    #14 0x457bf2 in main
/src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20:10
    #15 0x7f1be62800b2 in __libc_start_main
/build/glibc-eX1tMB/glibc-2.31/csu/libc-start.c:308:16
    #16 0x407d4d in _start
```

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-- links below jump to the message on this page --
2021-12-19 20:41 [Bug libdw/28715] New: There seems to be an infinite loop in dwfl_segment_report_module evvers at ya dot ru
2021-12-20  0:44 ` [Bug libdw/28715] " mark at klomp dot org
2021-12-20  2:40 ` evvers at ya dot ru
2021-12-20 11:41 ` evvers at ya dot ru
2021-12-20 15:39 ` evvers at ya dot ru
2021-12-20 15:47 ` evvers at ya dot ru
2021-12-20 17:25 ` mark at klomp dot org
2021-12-20 17:38 ` mark at klomp dot org
2021-12-20 20:58 ` evvers at ya dot ru
2021-12-21 11:17 ` mark at klomp dot org

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