Re: [RFC 1/1] shiftfs: uid/gid shifting bind mount

[James Bottomley]

On Mon, 2016-05-16 at 22:47 -0500, Serge E. Hallyn wrote:
> On Mon, May 16, 2016 at 10:28:32PM -0400, James Bottomley wrote:
> > On Mon, 2016-05-16 at 19:41 +0000, Serge Hallyn wrote:
> > > Hey James,
> > > 
> > > I probably did something wrong - but i applied your patch onto
> > > 4.6,
> > > compiled in shiftfs, did
> > > 
> > > mount -t shiftfs -o uidmap=0:100000:65536,gidmap=0:100000:65536
> > > /home/ubuntu /mnt
> > > 
> > > and ls segfaults and gives me kernel syslog msgs like:
> > 
> > Hm, it looks to be something IMA related, since the SUSE default is
> > no
> > IMA and this BUG in the filesystem is to do with the IMA version of
> > i_readcount_dec.  I'll recompile my kernel to see if I can
> > reproduce. 
> >  Just in case, what's the underlying filesystem on /home/ubuntu?
> 
> It was ext4

Thanks.  I've got it to reproduce with CONFIG_IMA set ... just
debugging now.

James