Hi,Bruce On 20180501 04:16, J. Bruce Fields wrote: > On Wed, Apr 25, 2018 at 02:03:20PM +0800, Lu Xinyu wrote: >> hi, folks >> >> >> I have client and server using nfsv3. The kernels are all 4.16-rc3. >> In client I mount a partition or a disk formatted in xfs/ext4 in >> /nfstest. It seems there is someting wrong with inheritance of sgid. I >> try the following operations in the client. >>> [root@localhost ]#id user1 >>> uid=1003(user1) gid=1006(testgroup1) >> groups=1006(testgroup1),1007(testgroup2) >>> [root@localhost ]# mount -t nfs -o vers=3 -o noac >> 192.168.56.9:/data/nfstest /mnt/test/ >>> [root@localhost ]# cd /mnt/test/ >>> [root@localhost ]# mkdir mainsub >>> [root@localhost ]# setfacl -d -m u:user2:rwx mainsub/ >>> [root@localhost ]# chown user1:testgroup1 mainsub/ >>> # chmod 2775 mainsub/ >>> [root@localhost ]# runuser -u user1 -g testgroup1 mkdir mainsub/subdir1 >>> [root@localhost ]# runuser -u user1 -g testgroup2 mkdir mainsub/subdir2 >>> [root@localhost ]# ls -l mainsub/ >>> drwxrwsr-x+ 2 user1 testgroup1 4096 Mar 6 22:50 subdir1 >>> drwxrwxr-x+ 2 user1 testgroup1 4096 Mar 6 22:50 subdir2 >> >> >> The subdir2 losts SGID. But if the same operations are applied in the >> xfs or ext4 directedly, the SGID could be interited normally. >> >>> [root@localhost ]# ls -l mainsub/ >>> drwxrwsr-x+ 2 user1 testgroup1 4096 Mar 6 22:55 subdir1 >>> drwxrwsr-x+ 2 user1 testgroup1 4096 Mar 6 22:55 subdir2 >> >> Is this a bug of NFSv3? >> >>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=073931017b49d9458aa351605b43a7e34598caef >> >> >> Clear SGID bit when setting file permissions >> >> It seems this patch will clear the nfs sgid. Should we keep it? > > Just searching for that commit id.... It looks like this was fixed by > ext4 by a3bb2d5587521eea6dab2d05326abb0afb460abd "ext4: Don't clear SGID > when inheriting ACLs". And there are similar patches for a bunch of > other filesystems. > > --b. > Thanks for reply. The SGID will not be cleared on the xfs. However, when it mounts a nfs the SGID will get lost. I think it is a NFS bug. Xinyu Lu -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
