[Bug libdw/23753] New: Invalid Address Read problem in dwfl_segment_report_module.c when executing ./eu-stack --core=$POC

["wcventure at 126 dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=23753

            Bug ID: 23753
           Summary: Invalid Address Read problem in
                    dwfl_segment_report_module.c when executing ./eu-stack
                    --core=$POC
           Product: elfutils
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          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: ---

Hi there,

Our fuzzer caught Invalid Address Read problem in eu-stack of the latest
elfutils-0.174 code base, this inputs will cause the segment faults and I have
confirmed them with address sanitizer too. Please use the "./eu-stack
--core=$POC" or "./eu-stack --core=$POC -abdilmsv" to reproduce the bug. If you
have any questions, please let me know.

The ASAN dumps the stack trace as follows:

ASAN:DEADLYSIGNAL
=================================================================
==9753==ERROR: AddressSanitizer: SEGV on unknown address 0x7f6afb9ac114 (pc
0x7f6afa17a7dc bp 0x7fffc8bb1900 sp 0x7fffc8bb17f0 T0)
==9753==The signal is caused by a READ memory access.
    #0 0x7f6afa17a7db in consider_notes
/elfutils-0.174/libdwfl/dwfl_segment_report_module.c:486
    #1 0x7f6afa17accc in consider_phdr
/elfutils-0.174/libdwfl/dwfl_segment_report_module.c:529
    #2 0x7f6afa176fa2 in dwfl_segment_report_module
/elfutils-0.174/libdwfl/dwfl_segment_report_module.c:590
    #3 0x7f6afa185ce0 in dwfl_core_file_report
/elfutils-0.174/libdwfl/core-file.c:541
    #4 0x405106 in parse_opt /elfutils-0.174/src/stack.c:590
    #5 0x7f6af9a64847 in argp_parse (/lib/x86_64-linux-gnu/libc.so.6+0x114847)
    #6 0x4056a7 in main /elfutils-0.174/src/stack.c:690
    #7 0x7f6af997082f in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
    #8 0x402308 in _start (/elfutils-0.174/build/bin/eu-stack+0x402308)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV
/elfutils-0.174/libdwfl/dwfl_segment_report_module.c:486 in consider_notes
==9753==ABORTING

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