On Wed, Jul 10, 2024 at 08:20:23 +0700, Max Nikulin wrote: > On 10/07/2024 02:35, Thomas Schmitt wrote: > > Here the error happens while trying to set the attribute. > > Shell equivalent is > > > > setfattr -n system.nfs4_acl -v > > '\0\0\0\3\0\0\0\0\0\0\0\0\0\26\1\247\0\0\0\6OWNER@\0\0\0\0\0' /tmp/x > > Shell does not interpret backslashes in single (and double) quotes. $'\0...' > might be better
You cannot pass raw NUL bytes as an argument to a program. It's impossible. The argument with a NUL byte in the first position will be treated as an empty string (zero length). > echo '\026' | xxd -g 1 > 00000000: 5c 30 32 36 0a \026. > > echo $'\026' | xxd -g 1 > 00000000: 16 0a .. hobbit:~$ echo $'\000\000ABCDEFG' | hd 00000000 0a |.| 00000001 Thomas's command is *relying* on setfattr interpreting the backslash sequences, because the shell cannot be allowed to do so.
