linux-kernel - Re: [PATCH 1/2] fs: anon_inodes: export anon_inode_getfile

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Date:   Wed, 19 May 2021 22:29:45 -0400
From:   Paul Moore <paul@...l-moore.com>
To:     Kumar Kartikeya Dwivedi <memxor@...il.com>
Cc:     io-uring@...r.kernel.org, Pavel Emelyanov <xemul@...nvz.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Jens Axboe <axboe@...nel.dk>,
        Pavel Begunkov <asml.silence@...il.com>,
        Lokesh Gidra <lokeshgidra@...gle.com>,
        Eric Biggers <ebiggers@...gle.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] fs: anon_inodes: export anon_inode_getfile_secure helper

On Wed, May 19, 2021 at 7:07 PM Kumar Kartikeya Dwivedi
<memxor@...il.com> wrote:
> On Wed, May 19, 2021 at 08:52:51PM IST, Paul Moore wrote:
> > On Wed, May 19, 2021 at 7:37 AM Kumar Kartikeya Dwivedi
> > <memxor@...il.com> wrote:
> > >
> > > This is the non-fd installing analogue of anon_inode_getfd_secure. In
> > > addition to allowing LSMs to attach policy to the distinct inode, this
> > > is also needed for checkpoint restore of an io_uring instance where a
> > > mapped region needs to mapped back to the io_uring fd by CRIU. This is
> > > currently not possible as all anon_inodes share a single inode.
> > >
> > > Signed-off-by: Kumar Kartikeya Dwivedi <memxor@...il.com>
> > > ---
> > >  fs/anon_inodes.c            | 9 +++++++++
> > >  include/linux/anon_inodes.h | 4 ++++
> > >  2 files changed, 13 insertions(+)
> >
> > [NOTE: dropping dancol@...gle as that email is bouncy]
> >
> > > diff --git a/fs/anon_inodes.c b/fs/anon_inodes.c
> > > index a280156138ed..37032786b211 100644
> > > --- a/fs/anon_inodes.c
> > > +++ b/fs/anon_inodes.c
> > > @@ -148,6 +148,15 @@ struct file *anon_inode_getfile(const char *name,
> > >  }
> > >  EXPORT_SYMBOL_GPL(anon_inode_getfile);
> >
> > This function should have a comment block at the top similar to
> > anon_inode_getfile(); in fact you can likely copy-n-paste the bulk of
> > it to use as a start.
> >
> > If you don't want to bother respinning, I've got this exact patch
> > (+comments) in my patchset that I'll post later and I'm happy to
> > give/share credit if that is important to you.
> >
>
> That'd be great; no credit is fine :). Please CC me when you post it.

Will do.  I dug out my system which had the patches and I'm working on
forward porting them to v5.13-rc2; if I don't have them cleaned up
enough for posting by Thursday, I'll make sure they are at least RFC
ready by Friday.

-- 
paul moore
www.paul-moore.com