Record Case Detail

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 pwd: /out/package
ppid: 4392
   1: WRITELN echo 321 |
   2: WRITELN cat
   3: WRITELN exit
exit: 1

Your answer may be identical to the JOJ answer in the first several lines.

However, the main problem you meet now is Runtime Error. And the exit code of your program is 1, which should be 0.

Please double check your code to solve this problem and try again.

mumsh $ 321
mumsh $ exit
mumsh $ =================================================================
==4393==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60c000000238 at pc 0x000000499a2c bp 0x7ffc6bf06b10 sp 0x7ffc6bf062c0
READ of size 121 at 0x60c000000238 thread T0
    #0 0x499a2b  (/out/package/mumsh_memory_check+0x499a2b)
    #1 0x51557b  (/out/package/mumsh_memory_check+0x51557b)
    #2 0x51dec4  (/out/package/mumsh_memory_check+0x51dec4)
    #3 0x7f32e1ecdb96  (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)
    #4 0x41cf89  (/out/package/mumsh_memory_check+0x41cf89)

0x60c000000238 is located 0 bytes to the right of 120-byte region [0x60c0000001c0,0x60c000000238)
allocated by thread T0 here:
    #0 0x4dce40  (/out/package/mumsh_memory_check+0x4dce40)
    #1 0x7f32e1f2bb8b  (/lib/x86_64-linux-gnu/libc.so.6+0x7fb8b)
    #2 0xffffffff  (<unknown module>)

SUMMARY: AddressSanitizer: heap-buffer-overflow (/out/package/mumsh_memory_check+0x499a2b) 
Shadow bytes around the buggy address:
  0x0c187fff7ff

mumsh $ > 321
mumsh $ exit

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JOJ Answer