[LU-18626] chgrp fails for file owner with read-only permissions

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.17.0
• Severity: 3
• Assignee: Max Wang
• Reporter: Max Wang

Description

Since https://review.whamcloud.com/c/fs/lustre-release/+/33996

was merged, chgrp requests from users with read-only permissions started throwing Permission Denied errors.

Reproducer script:

 

# Create the groups
sudo groupadd testGroupA
sudo groupadd testGroupB
# Create the user and add to groupA
sudo useradd -m -g testGroupA testUserA
sudo usermod -aG  testGroupB testUserA
# Create a file owned by testUserA and testGroupA
sudo touch /lfs/test/file.txt
sudo chown testUserA:testGroupA /lfs/test/file.txt
sudo chmod 444 /lfs/test/file.txt
# Verify the ownership
echo "Initial file ownership:"
ls -l /lfs/test/file.txt
# Change the group ownership to groupB using chgrp
sudo -u testUserA chgrp testGroupB /lfs/test/file.txt
# Verify the new ownership
echo "Updated file ownership:"
ls -l /lfs/test/file.txt 

 

Before:

ubuntu@ip-10-0-159-248:~$ ls -l /lfs/test/file1.txt
-r--r--r-- 1 testUserA testGroupA 0 Dec 24 05:16 /lfs/test/file1.txt
ubuntu@ip-10-0-159-248:~$ 
ubuntu@ip-10-0-159-248:~$ # Change the group ownership to groupB using chgrp
ubuntu@ip-10-0-159-248:~$ sudo -u testUserA chgrp testGroupB /lfs/test/file1.txt
ubuntu@ip-10-0-159-248:~$ 
ubuntu@ip-10-0-159-248:~$ # Verify the new ownership
ubuntu@ip-10-0-159-248:~$ echo "Updated file ownership:"
Updated file ownership:
ubuntu@ip-10-0-159-248:~$ ls -l /lfs/test/file1.txt
-r--r--r-- 1 testUserA testGroupB 0 Dec 24 05:16 /lfs/test/file1.txt

After:

Initial file ownership:
-r--r--r-- 1 testUserA testGroupA 0 Dec 24 05:22 /lfs/test/file.txt
chgrp: changing group of '/lfs/test/file.txt': Permission denied
Updated file ownership:
-r--r--r-- 1 testUserA testGroupA 0 Dec 24 05:22 /lfs/test/file.txt
Script complete.

 

Also confirmed XFS allows the request with Read-only permissions.

 

 

Issue Links

• is related to: LU-12922 pjdfstest chown_00: POSIX compliance failed on lustre