Messages in this thread | | | Date | Sun, 18 May 1997 01:07:19 +0100 (BST) | From | Matthew Kirkwood <> | Subject | fat-based fs mount bug?? |
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Hi,
I think that the following is a bug. (More likely kernel than mount, I think.) I'm not au-fait with what POSIX says about fs mounting and by whom, but believe that there is a problem somewhere here...
I first noticed it a while back (prob 2.1.28 or so), but couldn't spot the pattern (and didn't know whether I was just being inept), so I let it lie.
When I try to mount a fat-based (msdos or fat) fs from an "su" shell, it sets the permissions (on the mount dir /mnt/dosd/) from "drwxr-xr-x" to "drwx--x--x". This means that only root can read the stuff on my dosd partition, which is inconvenient. If, however, I use "su -", everything is fine. Similarly if I login as root.
I thought that the only difference between "su" and "su -" was that the latter ran all login scripts, and changed directories, etc.
Reasons I think it's a fat bug, rather than a vfs or mount problem: 0. It doesn't affect ext2 (hardcoded), or isofs (modular).
Relevant sysinfo: 0. Linux-2.1.38. Only my RadioTrack patch applied, which doesn't touch fs code ;-) 1. mount-2.6g 2. One (3.2Gb) IDE drive. 3. fat, msdos, vfat and isofs as modules. ext2 in kernel.
More stuff on request, but I can't think of any more useful stuff.
Sorry for the lack of patch, but I don't really know how VFS works yet. I'll keep looking tonight, though.
BTW: Could someone tell me what the rules are for the perms on a mount point? Are they kept? If changed while mounted, are they kept? Are they kept after umount?
----- From script ----- pc29:~$ ls -ld /mnt/dosc 1 drwxr-xr-x 2 root root 1024 Feb 17 12:14 /mnt/dosc/ pc29:~$ su Password: [root@pc29 weejock]# mount -t msdos /dev/hda1 /mnt/dosc [root@pc29 weejock]# ls -ld /mnt/dosc drwx--x--x 14 root root 16384 Jan 1 1970 /mnt/dosc [root@pc29 dosc]# exit pc29:~$ cd /mnt/dosc/ pc29:/mnt/dosc$ ls ls: .: Permission denied pc29:/mnt/dosc$ cd progra~1 pc29:/mnt/dosc/progra~1$ ls ls: .: Permission denied pc29:/mnt/dosc/progra~1$ cd .. pc29:/mnt/dosc$ cat autoexec.bat cat: autoexec.bat: Permission denied pc29:/mnt/dosc$ cat autoexec.ba cat: autoexec.ba: No such file or directory pc29:/mnt/dosc$ cd pc29:~$ su - <<======= Difference Password: [root@pc29 ~]# umount /mnt/dosc [root@pc29 ~]# mount -t msdos /dev/hda1 /mnt/dosc [root@pc29 ~]# ls -ld /mnt/dosc drwxr-xr-x 2 root root 1024 Feb 17 12:14 /mnt/dosc [root@pc29 ~]# logout <<======= Difference pc29:~$ cd /mnt/dosc pc29:/mnt/dosc$ ls total 2160 16 -rwxr-xr-x 1 root root 389 May 12 22:57 autoexec.bat* [snip] ----- end -----
Cheers, Matthew.
-- Matthew Kirkwood | Mail: weejock@ferret.lmh.ox.ac.uk LMH JCR, | Web: http://www-jcr.lmh.ox.ac.uk/~weejock/ Oxford OX2 6QA, | "Let your feelings slip ... England. | but never your mask ..." -- Underworld
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