[Bug binutils/29707] New: binutils c++filt reads a file with the first character \x00, it will wait for input and cause the program to block.

[fengzhengzhan at gmail dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29707

            Bug ID: 29707
           Summary: binutils c++filt reads a file with the first character
                    \x00, it will wait for input and cause the program to
                    block.
           Product: binutils
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: binutils
          Assignee: unassigned at sourceware dot org
          Reporter: fengzhengzhan at gmail dot com
  Target Milestone: ---

1) Overview: 
When the first character of the file is \x00, c++filt reads the file and then
waits for input causing the file to block. If \x00 appears in other locations
in the file, the program is not affected.
2) Steps to Reproduce: 
> [Attack Vectors]
> 1. Download the crash file from https://github.com/fengzhengzhan/FzzVul
> 2. Executing the Command Line with   c++filt @c++filt/crash01_timeout
> 3. The program will block. Thank you.
3) Actual Results: Reading the first character of the file causes the program
to block and wait for input.
4) Expected Results: Reads the characters in the file and immediately returns
the parsed symbols.
5) Build Date & Hardware: Build 2022-10-20 on ubuntu 20.04
6) Additional Information: I have provided manual tracking reports.
cxxfilt.c:199:7
cxxfilt.c:210:3
cxxfilt.c:218:22
cxxfilt.c:219:7
cxxfilt.c:230:16
cxxfilt.c:232:9
cxxfilt.c:0:0
cxxfilt.c:242:11
cxxfilt.c:248:11
cxxfilt.c:253:7
cxxfilt.c:254:11
cxxfilt.c:255:2
cxxfilt.c:227:3
cxxfilt.c:230:16
cxxfilt.c:232:9

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