RE: OT: Linux df question
- From: "Sweetser, Joe" <JSweetser@xxxxxxxx>
- To: De DBA <dedba@xxxxxxxxxx>
- Date: Mon, 14 Jul 2014 13:26:47 +0000
Tony,
Thank you for the testing/explanation. I will pass on the umask
suggestion/info to the systems team to see how they feel about changing it.
As far as I know, this machine is not dual-bootable. But I am admittedly a bit
in the dark about that aspect.
Much appreciated,
-joe
From: De DBA [mailto:dedba@xxxxxxxxxx]
Sent: Saturday, July 12, 2014 7:26 PM
To: Sweetser, Joe
Cc: oracle-l@xxxxxxxxxxxxx
Subject: Re: OT: Linux df question
Joe,
Is this a dual-boot machine with Windows? Why would the /boot and /boot/efi
partitions be formatted with VFAT instead of the usual ext4?
On 12/07/14 01:12, Sweetser, Joe wrote:
UUID=6fede090-8fff-40d8-9066-fcf9d6a67680 / ext4
defaults 1 1
UUID=F9A5-364C /boot vfat
umask=0077,shortname=winnt 0 0
UUID=F9A2-0016 /boot/efi vfat
umask=0077,shortname=winnt 0 0
I can now reproduce the issue by formatting 2 partitions with FAT file systems
and mounting one on top of the other with your mount options:
[root@emperor /]# mount -o umask=0077,shortname=winnt /dev/dm-3 /fattest
[root@emperor /]# mount -o umask=0077,shortname=winnt /dev/dm-4
/fattest/fat2test
[root@emperor /]# mount
/dev/mapper/vg_skerchi_sys-LVRoot1 on / type ext4 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw,rootcontext="system_u:object_r:tmpfs_t:s0")
/dev/sda1 on /boot type ext4 (rw)
/dev/mapper/vg_skerchi_sys-LVHome1 on /home type ext4 (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
/dev/mapper/vg_skerchi_sys-LVtest1 on /fattest type vfat
(rw,umask=0077,shortname=winnt)
/dev/mapper/vg_skerchi_sys-LVtest2 on /fattest/fat2test type vfat
(rw,umask=0077,shortname=winnt)
[root@emperor /]# df -h
Filesystem Size Used Avail Use% Mounted on
...
/dev/mapper/vg_skerchi_sys-LVtest1 8.0M 4.0K 8.0M 1% /fattest
/dev/mapper/vg_skerchi_sys-LVtest2 248M 4.0K 248M 1% /fattest/fat2test
[user@emperor ~]$ df -h
df: `/fattest/fat2test': Permission denied
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_skerchi_sys-LVRoot1 7.9G 2.8G 4.8G 37% /
tmpfs 372M 228K 371M 1% /dev/shm
/dev/sda1 485M 35M 426M 8% /boot
/dev/mapper/vg_skerchi_sys-LVHome1 1008M 104M 854M 11% /home
/dev/mapper/vg_skerchi_sys-LVtest1 8.0M 4.0K 8.0M 1% /fattest
If the mountflags on both vfat partitions are set to umask=0022 (drwxr-xr-x) or
umask=0066 (drwx--x--x) the error goes away. If the umask is 0066, the
directory cannot be listed by ordinary users, so perhaps that can pass the
security requirements for your organisation...
Cheers,
Tony
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