The meanings are (from mount(8) and fstab(5) man pages):
user - allow any user to mount this.
exec - permit execution of binaries from this drive.
dev - interpret character or block special devices found on the file
system.
suid - allow suid and sgid bits active, i.e. executables can be run suid and
sgid.
rw - mount file system with read and write.
conv=auto - convert carriage return/linefeed pairs to/from newline character
automatically based on well known file extensions
uid=0 - mount all files with a uid of zero (that's root)
gid=100 - mount all files with group id set to 100 (usually this is the
"users" group
I don't see anything wrong with the above but I wouldn't use suid, uid=, or
gid=. And I'm not sure what effect "dev" would have on a FAT16 partition.
I use noauto and user only. The defaults for other capabilities are
generally safe. "Exec"uting msdos binaries under Linux isn't something I'd
normally try. Mounting read/write is the default so an explicit statement
isn't needed. Allowing everything on the drive to be executed suid is not a
good idea at all.
Hope this helps,
[EMAIL PROTECTED]
[EMAIL PROTECTED]
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Hong F Du
Sent: Thursday, July 20, 2000 7:21 AM
To: Tim Walberg; Linux-support
Subject: Re: Cannot change permissions on a mountable drive
My problem still persists. I read the manpages of mount and umount and some
books too.
Then I checked the file /etc/fstab, the entry I am having problem with is:
/dev/hda6 /mnt/dosE msdos
user,exec,dev,suid,rw,conv=auto,uid=0,gid=100
1 1
I am trying to understand part of this line, Can some one please tell me
what this
user,exec,dev,suid,rw,conv=auto,uid=0,gid=100 1 1
means, specially exec,dev, suid ,uid=0? What other options do I have? What
is the
default setting for a FAT16 file system?
Thank you
feng
Hong F Du wrote:
> The /mnt/dosE is a fat16 file system which is on a ide hard drive from my
> dual-boot NT/Linux system. It is setup as msdos type with auto
translation mode
> when mounted. As a root, I can rwx the mounted /mnt/dosE. Now I want it to
be read
> and writable for USERS group too, that makes problem appear.
>
> feng
>
> Tim Walberg wrote:
>
> > On 07/19/2000 14:28 -0400, Hong F Du wrote:
> > >> Hi All,
> > >>
> > >> I have a dos formatted drive /mnt/dosE, its permission is 761.
When it
> > >> is not mount yet, I can change its mode to 771. When I mount
it, its
> > >> permission is automatically changed back to 761. Once the drive
is
> > >> mounted, I cannot change its permission no matter what I try.
> > >>
> >
> > When the drive is not mounted, the chmod affects only the directory
> > on which the drive will be mounted. Once the drive is mounted, the
> > root inode of that filesystem overlays the directory (so you can't
> > get to the directory any more until the drive is unmounted), so chmod
> > would then affect that inode, and not the directory. Why you can't
> > change the mode on the filesystem's root inode, though I can't
> > say - are you mounting it read-only? Is it NTFS, which (usually)
> > can't be mounted read-write? A cdrom? A FAT filesystem which doesn't
> > relate directly to the Unix permission triad? Need more information
> > to analyze any further...
> >
> > tw
> >
> > >> What is going on here? How should I make the permission change?
> > >>
> > >> Thank you in advanced
> > >>
> > >> feng
> > End of included message
> >
> > --
> > +--------------------------+------------------------------+
> > | Tim Walberg | [EMAIL PROTECTED] |
> > | 828 Marshall Ct. | www.concentric.net/~twalberg |
> > | Palatine, IL 60074 | |
> > +--------------------------+------------------------------+
> >
>
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> > Part 1.2Type: application/pgp-signature
