linux-kernel - Re: [PATCH 1/1] hostfs: fix UML crash

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Date:	Mon, 18 Oct 2010 20:53:58 +0200
From:	Richard Weinberger <richard@....at>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, jdike@...toit.com,
	user-mode-linux-devel@...ts.sourceforge.net,
	viro@...iv.linux.org.uk, toralf.foerster@....de
Subject: Re: [PATCH 1/1] hostfs: fix UML crash

Am Montag 18 Oktober 2010, 20:40:39 schrieb Andrew Morton:
> On Mon, 18 Oct 2010 18:36:54 +0200 Richard Weinberger <richard@....at> 
wrote:
> > 365b1818 resized f_spare within struct statfs.
> > hostfs accesses f_spare directly and needs an update.
> > 
> > Signed-off-by: Richard Weinberger <richard@....at>
> > Reported-by: Toralf F__rster <toralf.foerster@....de>
> > Tested-by: Toralf F__rster <toralf.foerster@....de>
> > ---
> > 
> >  fs/hostfs/hostfs_user.c |    2 +-
> >  1 files changed, 1 insertions(+), 1 deletions(-)
> > 
> > diff --git a/fs/hostfs/hostfs_user.c b/fs/hostfs/hostfs_user.c
> > index 6777aa0..ce2f168 100644
> > --- a/fs/hostfs/hostfs_user.c
> > +++ b/fs/hostfs/hostfs_user.c
> > @@ -388,6 +388,6 @@ int do_statfs(char *root, long *bsize_out, long long
> > *blocks_out,
> > 
> >  	spare_out[1] = buf.f_spare[1];
> >  	spare_out[2] = buf.f_spare[2];
> >  	spare_out[3] = buf.f_spare[3];
> > 
> > -	spare_out[4] = buf.f_spare[4];
> > +
> > 
> >  	return 0;
> >  
> >  }
> 
> Thanks.
> 
> Is there any reason for hostfs to be playing with the f_spare field at all?

I'm not sure why hostfs is using this field.
Currently I'm reviewing UML. 
As soon I'm done with hostfs you'll receive a patch or an explanation. :-)

Cheers,
//richard
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