Record Case Detail

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 pwd: /out/package
ppid: 68968
   1: WRITELN echo 123 > 1.txt
   2: WRITELN echo 222 > 2.txt
   3: WRITELN echo 321 > 4.txt
   4: WRITELN <1.txt>3.txt cat 2.txt 4.txt
   5: WRITELN cat 1.txt
   6: WRITELN cat 2.txt
   7: WRITELN cat 3.txt
   8: WRITELN cat 4.txt
   9: WRITELN ls
  10: WRITELN exit

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

However, you will still get Wrong Answer because the complete output may be longer and there might be errors in the future lines.

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

=================================================================
==68969==ERROR: AddressSanitizer: stack-buffer-underflow on address 0x7ffd731f1fbf at pc 0x0000005164c3 bp 0x7ffd731f18d0 sp 0x7ffd731f18c8
READ of size 1 at 0x7ffd731f1fbf thread T0
    #0 0x5164c2  (/out/package/mumsh_memory_check+0x5164c2)
    #1 0x515621  (/out/package/mumsh_memory_check+0x515621)
    #2 0x7f52a939bb96  (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)
    #3 0x41cd39  (/out/package/mumsh_memory_check+0x41cd39)

Address 0x7ffd731f1fbf is located in stack of thread T0 at offset 31 in frame
    #0 0x51510f  (/out/package/mumsh_memory_check+0x51510f)

  This frame has 1 object(s):
    [32, 1056) 'cmdline' <== Memory access at offset 31 underflows this variable
HINT: this may be a false positive if your program uses some custom stack unwind mechanism or swapcontext
      (longjmp and C++ exceptions *are* supported)
SUMMARY: AddressSanitizer: stack-buffer-underflow (/out/package/mumsh_memory_check+0x5164c2) 
Shadow bytes around the bugg

mumsh $ mumsh $ mumsh $ mumsh $ mumsh $ 123
mumsh $ 222
mumsh $ 222
321
mumsh $ 321
mumsh $ 1.txt
2.txt
3.txt
4.txt
driver
mumsh
mumsh_memory_check
mumsh $ exit

Notes

Stderr

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Your Answer

JOJ Answer