bug in fsck or ext2/ext3?

bug in fsck or ext2/ext3?

[Antoine Martin]

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Hi Ted / LKML,

I've got this snapshot of an ext3 filesystem with a directory that
simply cannot be removed! (image below is just 1.2MB)
As root:
# wget http://users.nagafix.co.uk/~antoine/root-broken.bz2
# bunzip2 root-broken.bz2
# mount -o loop -t ext2 root-broken ./tmp
# rm -fr tmp/chroot.broken
rm: cannot remove directory (...)
Same result when trying to do anything to those files chown/chmod/touch:
"Operation not permitted"

Tested with e2fsprogs v1.39 on 3 systems.
Not sure where else to post this...

Cheers
Antoine
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Re: bug in fsck or ext2/ext3?

[Dave Jones]

On Mon, Sep 24, 2007 at 05:56:39PM +0100, Antoine Martin wrote:

 > I've got this snapshot of an ext3 filesystem with a directory that
 > simply cannot be removed! (image below is just 1.2MB)
 > As root:
 > # wget http://users.nagafix.co.uk/~antoine/root-broken.bz2
 > # bunzip2 root-broken.bz2
 > # mount -o loop -t ext2 root-broken ./tmp
 > # rm -fr tmp/chroot.broken
 > rm: cannot remove directory (...)
 > Same result when trying to do anything to those files chown/chmod/touch:
 > "Operation not permitted"
 > 
 > Tested with e2fsprogs v1.39 on 3 systems.
 > Not sure where else to post this...

Various files in the directories it complains about have their 'i'
bit set.  lsattr will show you.   chattr -i those files, and the
directory is removable again.

	Dave

-- 
http://www.codemonkey.org.uk

Re: bug in fsck or ext2/ext3?

[David Newall]

Dave Jones wrote:
> On Mon, Sep 24, 2007 at 05:56:39PM +0100, Antoine Martin wrote:
>
>  > # rm -fr tmp/chroot.broken
>  > rm: cannot remove directory (...)
>  > Same result when trying to do anything to those files chown/chmod/touch:
>  > "Operation not permitted"
>
> Various files in the directories it complains about have their 'i'
> bit set.  lsattr will show you.   chattr -i those files, and the
> directory is removable again.

Additionally, this is a classic symptom of malware.  A directory  named 
"..." is a big hint.

Re: bug in fsck or ext2/ext3?

[Dave Jones]

On Tue, Sep 25, 2007 at 03:46:25AM +0930, David Newall wrote:
 > Dave Jones wrote:
 > > On Mon, Sep 24, 2007 at 05:56:39PM +0100, Antoine Martin wrote:
 > >
 > >  > # rm -fr tmp/chroot.broken
 > >  > rm: cannot remove directory (...)
 > >  > Same result when trying to do anything to those files chown/chmod/touch:
 > >  > "Operation not permitted"
 > >
 > > Various files in the directories it complains about have their 'i'
 > > bit set.  lsattr will show you.   chattr -i those files, and the
 > > directory is removable again.
 > 
 > Additionally, this is a classic symptom of malware.  A directory  named 
 > "..." is a big hint.

That was "..." as in "more stuff follows" rather than the actual name
being reported.

	Dave

-- 
http://www.codemonkey.org.uk

Re: bug in fsck or ext2/ext3?

[Alistair John Strachan]

On Monday 24 September 2007 17:56:39 Antoine Martin wrote:
> Hi Ted / LKML,
>
> I've got this snapshot of an ext3 filesystem with a directory that
> simply cannot be removed! (image below is just 1.2MB)
> As root:
> # wget http://users.nagafix.co.uk/~antoine/root-broken.bz2
> # bunzip2 root-broken.bz2
> # mount -o loop -t ext2 root-broken ./tmp
> # rm -fr tmp/chroot.broken
> rm: cannot remove directory (...)
> Same result when trying to do anything to those files chown/chmod/touch:
> "Operation not permitted"
>
> Tested with e2fsprogs v1.39 on 3 systems.
> Not sure where else to post this...

URL is broken. Tried doing a "lsattr" to ensure no xattrs (like +i) are set?

-- 
Cheers,
Alistair.

137/1 Warrender Park Road, Edinburgh, UK.