Hello,
I've been playing around with knoppix and unionfs 1.1.3 and came across the
following
bug. Basically if we have:
- an empty rw layer
- a ro layer with /home owned by root, but not writeable by anybody (perm
555)
and /home/knoppix in it, owned by some user
if the user tries to write to his /home/knoppix dir, the process hangs.
(Note: Changing /home permissions to 755 fixes it in my case)
i've tried with linux kernel 2.6.13.2 and 2.6.12.
i can reproduce it with the following commands:
---------------------------------------------------------------------
(assuming a (non root) knoppix user exists)
as root, in /mnt:
mkdir tmp5 tmp6 tmp7
mount -t tmpfs -o 'size=5000000' /mnt/tmp5 /mnt/tmp5
mount -t tmpfs -o 'size=5000000' /mnt/tmp6 /mnt/tmp6
mkdir -p tmp6/home/knoppix
chown knoppix: tmp6/home/knoppix
chmod 555 tmp6/home
mount -o remount,ro tmp6
mount -t unionfs -o 'dirs=/mnt/tmp5=rw:/mnt/tmp6=ro' /mnt/tmp7 /mnt/tmp7
as knoppix user:
touch /mnt/tmp6/home/knoppix/foo
[hangs, can't be killed]
---------------------------------------------------------------------
Also i've had weird results when using unionfs on directories that are not
the root of
their filesystem (that was for the ro layer in my case). It doesn't work
most of the time
(EROFS when trying to write to union basically).
I initially thought this was legal since the module doesn't complain and the
documentation doesn't state otherwise...
Cheers
-- Matt
_________________________________________________________________
MSN Messenger : discutez en direct avec vos amis !
http://www.msn.fr/msger/default.asp
_______________________________________________
unionfs mailing list
[email protected]
http://www.fsl.cs.sunysb.edu/mailman/listinfo/unionfs
