Re: FEATURE (was Re: PROBLEM: multiple mount of devices possible2.4.0-test1 - 2.4.0-test13-pre4

[rkreiner@sbox.tu-graz.ac.at]

Tigran Aivazian wrote:
> 
> it is not a problem, it is a feature. (and a useful one!)
> 

yes, mount devices several times it would be a nice feature, but do
something like:

/etc/fstab:
/dev/hdd1 /mydrive ext2 ro,noauto,user 1 1

as user: mount /mydrive
as root: mount /dev/hda2 /mydrive
as user: mount /mydrive
as root: mount /dev/hda2 /mydrive
as user: mount /mydrive

result /proc/mounts:
/dev/hdd1 /mydrive ext2 ro,noexec,nosuid,nodev 0 0
/dev/hda2 /mydrive vfat rw 0 0
/dev/hdd1 /mydrive ext2 ro,noexec,nosuid,nodev 0 0
/dev/hda2 /mydrive vfat rw 0 0
/dev/hdd1 /mydrive ext2 ro,noexec,nosuid,nodev 0 0     

u dont have control about the mountpoints

Here a BIG PROBLEM:
as user: mount /mydrive
as root: mount /dev/hdd1 /test
as root: mount /dev/hdd1 /mnt

result /proc/mounts:
/dev/hdd1 /mydrive ext2 ro,noexec,nosuid,nodev 0 0
/dev/hdd1 /test ext2 ro,noexec,nosuid,nodev 0 0
/dev/hdd1 /mnt ext2 ro,noexec,nosuid,nodev 0 0    

but do like 
mount -o remount /mnt -w

result /proc/mounts:
/dev/hdd1 /mydrive ext2 rw 0 0
/dev/hdd1 /test ext2 rw 0 0
/dev/hdd1 /mnt ext2 rw 0 0     

ALL mountpoints now READ-WRITE-able!

u lost noexec... and dont have more "security" for users...
same as sym-links ... no new feature...


Reinhard.

> On Sat, 23 Dec 2000 rkreiner@sbox.tu-graz.ac.at wrote:
> 
> >
> > 1. multiple mount of devices possible 2.4.0-test1 - 2.4.0-test13-pre4
> >
> > 2. its still possible to mount devices several times.
> >    IMHO it shouldnt be possible like 2.2.18
> >    with umount in /proc/mounts is still the real information,
> >    in /etc/mtab all corresponding mountpoints are deleted.
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