Record Case Detail

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 pwd: /out/package
ppid: 2109
   1: WRITELN > abc | | grep 123
   2: 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 $ =================================================================
==2110==ERROR: AddressSanitizer: stack-buffer-underflow on address 0x7ffca01185de at pc 0x0000005234ea bp 0x7ffca0118230 sp 0x7ffca0118228
READ of size 1 at 0x7ffca01185de thread T0
    #0 0x5234e9  (/out/package/mumsh_memory_check+0x5234e9)
    #1 0x525e1b  (/out/package/mumsh_memory_check+0x525e1b)
    #2 0x7efeae310b96  (/lib/x86_64-linux-gnu/libc.so.6+0x21b96)
    #3 0x41d2c9  (/out/package/mumsh_memory_check+0x41d2c9)

Address 0x7ffca01185de is located in stack of thread T0 at offset 30 in frame
    #0 0x525bff  (/out/package/mumsh_memory_check+0x525bff)

  This frame has 1 object(s):
    [32, 1056) 'input' <== Memory access at offset 30 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+0x5234e9) 
Shadow bytes around the

mumsh $ error: missing program
mumsh $ exit

Notes

Stderr

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Your Answer

JOJ Answer