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Re: [PATCH v15 00/22] Richacls (Core and Ext4)

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On Tue, Nov 10, 2015 at 10:43:46AM -0600, Steve French wrote:
> On Tue, Nov 10, 2015 at 6:39 AM, Andreas Gruenbacher
> <agruenba@redhat.com> wrote:
> > On Tue, Nov 10, 2015 at 12:29 PM, Christoph Hellwig <hch@infradead.org> wrote:
> >> On Mon, Nov 09, 2015 at 12:08:41PM +0100, Andreas Gruenbacher wrote:
> >>> Here is another update to the richacl patch queue.  This posting contains
> >>> the patches ready to be merged; the patches later in the queue still need
> >>> some more review.
> <snip>
> >> and still abuses xattrs instead of a proper syscall interface.
> >> That's far from being ready to merge.
> >
> > The xattr syscall interface is what's used for very similar kinds of
> > things today; using it for richacls as well sure does not count as
> > abuse. Things could be improved in the xattr interface and in its
> > implementation, but we need more substantial reasons than that for
> > reimplementing the wheel once again.
> 
> I don't have strong disagreement with using pseudo-xattrs to
> store/retrieve ACLs (we already do this) but retrieving/setting an ACL
> all at once can be awkward  when ACLs are quite large e.g. when it
> encodes to over 1MB

At least in the NFS case, that's also a limitation of the protocol.  If
we really wanted to support massive ACLs then we'd need both syscall and
NFS interfaces to allow incrementally reading and writing ACLs, and I
don't even know what those would look like.

So this is a fine limitation as far as I'm concerned.

> (not all administrators think about the size of
> ACLs when they add hundreds of users or groups or apps to ACLs).
> 
> The bigger problem is that when ACLs are created -- after -- the file
> is created there is a potential race (harder to deal with in cluster
> and network file systems).   Ideally we should be able to optionally
> pass all the security information needed to create a file in the
> create call itself.  For apps which don't care they can continue to
> use the old syscalls.

That would be most of them, I'd think.

But I suppose windows apps (via Samba or Wine?) could use this.

Definitely a project for another day, in any case.

--b.

> In cifs.ko I still need to enable the SMB3 ACL helper functions
> (currently only enabled for the older cifs dialect) since that will
> make it easier, and figure out a way to allow helper tools to view
> "claims based ACLs" (DAC), not just traditional
> CIFS/NTFS/SMB3/RichACLs.
> -- 
> Thanks,
> 
> Steve
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[PATCH v15 00/22] Richacls (Core and Ext4) Andreas Gruenbacher <agruenba@redhat.com> - 2015-11-09 12:10 +0100
  [PATCH v15 02/22] vfs: Add MAY_CREATE_FILE and MAY_CREATE_DIR permission flags Andreas Gruenbacher <agruenba@redhat.com> - 2015-11-09 12:10 +0100
  [PATCH v15 21/22] ext4: Add richacl support Andreas Gruenbacher <agruenba@redhat.com> - 2015-11-09 12:20 +0100
  [PATCH v15 06/22] richacl: In-memory representation and helper functions Andreas Gruenbacher <agruenba@redhat.com> - 2015-11-09 12:20 +0100
  [PATCH v15 20/22] vfs: Add richacl permission checking Andreas Gruenbacher <agruenba@redhat.com> - 2015-11-09 12:20 +0100
  [PATCH v15 09/22] richacl: Permission check algorithm Andreas Gruenbacher <agruenba@redhat.com> - 2015-11-09 12:20 +0100
  [PATCH v15 14/22] richacl: Update the file masks in chmod() Andreas Gruenbacher <agruenba@redhat.com> - 2015-11-09 12:20 +0100
  [PATCH v15 19/22] richacl: Add richacl xattr handler Andreas Gruenbacher <agruenba@redhat.com> - 2015-11-09 12:20 +0100
    Re: [PATCH v15 19/22] richacl: Add richacl xattr handler Andreas Gruenbacher <agruenba@redhat.com> - 2015-11-11 02:20 +0100
  [PATCH v15 18/22] richacl: xattr mapping functions Andreas Gruenbacher <agruenba@redhat.com> - 2015-11-09 12:20 +0100
  [PATCH v15 22/22] ext4: Add richacl feature flag Andreas Gruenbacher <agruenba@redhat.com> - 2015-11-09 12:20 +0100
  [PATCH v15 08/22] richacl: Compute maximum file masks from an acl Andreas Gruenbacher <agruenba@redhat.com> - 2015-11-09 12:20 +0100
  [PATCH v15 13/22] vfs: Cache richacl in struct inode Andreas Gruenbacher <agruenba@redhat.com> - 2015-11-09 12:20 +0100
  [PATCH v15 17/22] richacl: Automatic Inheritance Andreas Gruenbacher <agruenba@redhat.com> - 2015-11-09 12:20 +0100
  [PATCH v15 12/22] vfs: Add get_richacl and set_richacl inode operations Andreas Gruenbacher <agruenba@redhat.com> - 2015-11-09 12:20 +0100
  [PATCH v15 15/22] richacl: Check if an acl is equivalent to a file mode Andreas Gruenbacher <agruenba@redhat.com> - 2015-11-09 12:20 +0100
  [PATCH v15 16/22] richacl: Create-time inheritance Andreas Gruenbacher <agruenba@redhat.com> - 2015-11-09 12:20 +0100
  [PATCH v15 10/22] posix_acl: Unexport acl_by_type and make it static Andreas Gruenbacher <agruenba@redhat.com> - 2015-11-09 12:20 +0100
  [PATCH v15 11/22] vfs: Cache base_acl objects in inodes Andreas Gruenbacher <agruenba@redhat.com> - 2015-11-09 12:30 +0100
  [PATCH v15 07/22] richacl: Permission mapping functions Andreas Gruenbacher <agruenba@redhat.com> - 2015-11-09 12:30 +0100
  [PATCH v15 01/22] vfs: Add IS_ACL() and IS_RICHACL() tests Andreas Gruenbacher <agruenba@redhat.com> - 2015-11-09 12:30 +0100
  Re: [PATCH v15 00/22] Richacls (Core and Ext4) Christoph Hellwig <hch@infradead.org> - 2015-11-10 12:30 +0100
    Re: [PATCH v15 00/22] Richacls (Core and Ext4) Andreas Gruenbacher <agruenba@redhat.com> - 2015-11-10 13:50 +0100
      Re: [PATCH v15 00/22] Richacls (Core and Ext4) Steve French <smfrench@gmail.com> - 2015-11-10 17:50 +0100
        Re: [PATCH v15 00/22] Richacls (Core and Ext4) "J. Bruce Fields" <bfields@fieldses.org> - 2015-11-10 18:10 +0100
          Re: [PATCH v15 00/22] Richacls (Core and Ext4) Andreas Gruenbacher <agruenba@redhat.com> - 2015-11-10 19:10 +0100
            Re: [PATCH v15 00/22] Richacls (Core and Ext4) "J. Bruce Fields" <bfields@fieldses.org> - 2015-11-10 20:20 +0100
      Re: [PATCH v15 00/22] Richacls (Core and Ext4) Christoph Hellwig <hch@infradead.org> - 2015-11-11 09:00 +0100
        Re: [PATCH v15 00/22] Richacls (Core and Ext4) Andreas Gruenbacher <agruenba@redhat.com> - 2015-11-11 15:00 +0100

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