linux-kernel - Re: [v2] Re: [091/129] block: fail SCSI passthrough ioctls on partition devices

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Message-ID: <20120126000749.GC14281@kroah.com>
Date:	Wed, 25 Jan 2012 16:07:49 -0800
From:	Greg KH <greg@...ah.com>
To:	Josh Boyer <jwboyer@...il.com>
Cc:	Sven-Haegar Koch <haegar@...net.de>,
	Paolo Bonzini <pbonzini@...hat.com>,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, linux-scsi@...r.kernel.org,
	Jens Axboe <axboe@...nel.dk>,
	James Bottomley <JBottomley@...allels.com>
Subject: Re: [v2] Re: [091/129] block: fail SCSI passthrough ioctls on
 partition devices

On Wed, Jan 25, 2012 at 06:10:47PM -0500, Josh Boyer wrote:
> On Wed, Jan 25, 2012 at 5:51 PM, Sven-Haegar Koch <haegar@...net.de> wrote:
> > On Wed, 25 Jan 2012, Greg KH wrote:
> >
> >> On Tue, Jan 24, 2012 at 05:43:50PM +0100, Paolo Bonzini wrote:
> >> > > You need to return -ENOTTY from scsi_verify_blk_ioctl and -ENOIOCTLCMD from
> >> > > sd_compat_ioctl, because -ENOIOCTLCMD will not be handled correctly by
> >> > > block/ioctl.c.  This would break BLKROSET and BLKFLSBUF done by non-root
> >> > > but with the appropriate capabilities.
> >> > >
> >> > > Fixed patch follows.  If you prefer that I send an interdiff, let me know.
> >>
> >> Wait, why do you want the stable trees to diverge from what is in
> >> Linus's tree with regards to the error codes being returned?
> >>
> >> That doesn't seem safe, or sane.
> >>
> >> So for now, I'm going to follow what is in Linus's tree.  If you
> >> need/want the error codes to be different, then shouldn't it also be
> >> done there as well?
> >
> > May be because the stable trees do not have
> > 07d106d0a33d6063d2061305903deb02489eba20? "vfs: fix up ENOIOCTLCMD error
> > handling"?
> 
> I believe that is the case, yes.  Linus was unhappy about ENOIOCTLCMD vs.
> ENOTTY overall when the patch was first submitted, which lead to that commit.
> The patches Paolo submitted for stable are the original versions that apply
> directly to 3.2 and older.
> 
> 07d106d0a isn't really stable material as it was put into 3.3 to catch any odd
> fallout from the change.

Ok, thanks both of you, that makes more sense now.  I'll take Paolo's
updated patches and do a release now.

greg k-h
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