[setfacl] permission denied in both /tmp and /dev/shm

Running lab 32.3. "Using Access Control Lists" in an Ubuntu 20.04 virtualbox, either in directory /dev/shm or in /tmp, brings the error:
-bash: /dev/shm/afile: Permission denied
The steps are:
- with user1:
echo This is a file > /dev/shm/afile getfacl /dev/shm/afile setfacl -m u:user2:rw /dev/shm/afile getfacl /dev/shm/afile
- and then with user2:
echo another line > /dev/shm/afile
But the same procedure goes well under user1 home directory. The second user is added with sudo useradd -k /home/user1/ -m -s /bin/bash user2
. The directory /dev/shm is of type tmpfs as shown with df -hT
, and the type of /tmp doesn't appear.
Maybe I missed something?
Comments
-
Hi @thomas.bucaioni ,
That's because the sticky bit on /tmp on Ubuntu 20.04. So, you can try the lab in another directory, let's say /mnt/lab .
Another way to make it work, is to temporarily remove the sticky bit from /tmp , do the lab, and then set the sticky bit again.Regards,
Luis.0 -
0
-
Hi @thomas.bucaioni, it's a pleasure!
Regards,
Luis.0
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