From: Jeremy Allison <jra@samba.org>
To: Miklos Szeredi <miklos@szeredi.hu>
Cc: "J. Bruce Fields" <bfields@fieldses.org>,
Andreas Gruenbacher <agruenba@redhat.com>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Christoph Hellwig <hch@infradead.org>,
"Theodore Ts'o" <tytso@mit.edu>,
Andreas Dilger <adilger.kernel@dilger.ca>,
Jeff Layton <jlayton@poochiereds.net>,
Trond Myklebust <trond.myklebust@primarydata.com>,
Anna Schumaker <anna.schumaker@netapp.com>,
Dave Chinner <david@fromorbit.com>,
"linux-ext4@vger.kernel.org" <linux-ext4@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Linux NFS list <linux-nfs@vger.kernel.org>,
linux-cifs@vger.kernel.org, Linux API <linux-api@vger.kernel.org>
Subject: Re: [PATCH v27 03/21] vfs: Add MAY_DELETE_SELF and MAY_DELETE_CHILD permission flags
Date: Tue, 6 Dec 2016 13:36:28 -0800 [thread overview]
Message-ID: <20161206213628.GD4498@jra3> (raw)
In-Reply-To: <CAJfpegsvoZfzUXyCJrxXAG6dxk8HMCGMEKA0E-6FzWNGkM17Tw@mail.gmail.com>
On Tue, Dec 06, 2016 at 10:25:22PM +0100, Miklos Szeredi wrote:
> On Tue, Dec 6, 2016 at 10:13 PM, Jeremy Allison <jra@samba.org> wrote:
> > On Tue, Dec 06, 2016 at 03:15:29PM -0500, J. Bruce Fields wrote:
> >> On Fri, Dec 02, 2016 at 10:57:42AM +0100, Miklos Szeredi wrote:
> >> > On Tue, Oct 11, 2016 at 2:50 PM, Andreas Gruenbacher
> >> > <agruenba@redhat.com> wrote:
> >> > > Normally, deleting a file requires MAY_WRITE access to the parent
> >> > > directory. With richacls, a file may be deleted with MAY_DELETE_CHILD access
> >> > > to the parent directory or with MAY_DELETE_SELF access to the file.
> >> > >
> >> > > To support that, pass the MAY_DELETE_CHILD mask flag to inode_permission()
> >> > > when checking for delete access inside a directory, and MAY_DELETE_SELF
> >> > > when checking for delete access to a file itself.
> >> > >
> >> > > The MAY_DELETE_SELF permission overrides the sticky directory check.
> >> >
> >> > And MAY_DELETE_SELF seems totally inappropriate to any kind of rename,
> >> > since from the point of view of the inode we are not doing anything at
> >> > all. The modifications are all in the parent(s), and that's where the
> >> > permission checks need to be.
> >>
> >> I'm having a hard time finding an authoritative reference here (Samba
> >> people might be able to help), but my understanding is that Windows
> >> gives this a meaning something like "may I delete a link to this file".
> >>
> >> (And not even "may I delete the *last* link to this file", which might
> >> also sound more logical.)
> >
> > I just did a recent patch here. In Samba we now check for
> > SEC_DIR_ADD_FILE/SEC_DIR_ADD_SUBDIR on the target directory
> > (depending on if the object being moved is a file or dir).
>
> And MAY_DELETE_SELF as well, for rename? That's really counterintuitive for me.
Yeah on the source handle we insist on DELETE_ACCESS|FILE_WRITE_ATTRIBUTES
permissions also.
next prev parent reply other threads:[~2016-12-06 21:37 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-11 12:50 [PATCH v27 00/21] Richacls (Core and Ext4) Andreas Gruenbacher
2016-10-11 12:50 ` [PATCH v27 01/21] vfs: Add IS_ACL() and IS_RICHACL() tests Andreas Gruenbacher
2016-10-11 12:50 ` [PATCH v27 02/21] vfs: Add MAY_CREATE_FILE and MAY_CREATE_DIR permission flags Andreas Gruenbacher
2016-12-02 9:22 ` Miklos Szeredi
2017-02-13 15:34 ` Andreas Gruenbacher
2016-10-11 12:50 ` [PATCH v27 03/21] vfs: Add MAY_DELETE_SELF and MAY_DELETE_CHILD " Andreas Gruenbacher
2016-12-02 9:57 ` Miklos Szeredi
2016-12-06 20:15 ` J. Bruce Fields
2016-12-06 21:13 ` Jeremy Allison
2016-12-06 21:25 ` Miklos Szeredi
2016-12-06 21:36 ` Jeremy Allison [this message]
2017-02-13 15:40 ` Andreas Gruenbacher
2017-02-13 15:42 ` Andreas Gruenbacher
2016-10-11 12:50 ` [PATCH v27 04/21] vfs: Add permission flags for setting file attributes Andreas Gruenbacher
2016-10-11 12:50 ` [PATCH v27 05/21] richacl: In-memory representation and helper functions Andreas Gruenbacher
2016-10-11 12:50 ` [PATCH v27 06/21] richacl: Permission mapping functions Andreas Gruenbacher
2016-10-11 12:50 ` [PATCH v27 07/21] richacl: Permission check algorithm Andreas Gruenbacher
2016-10-11 12:50 ` [PATCH v27 08/21] richacl: Compute maximum file masks from an acl Andreas Gruenbacher
2016-10-11 12:50 ` [PATCH v27 09/21] vfs: Cache base_acl objects in inodes Andreas Gruenbacher
2016-10-11 12:50 ` [PATCH v27 10/21] vfs: Add get_richacl and set_richacl inode operations Andreas Gruenbacher
2016-10-11 12:50 ` [PATCH v27 11/21] vfs: Cache richacl in struct inode Andreas Gruenbacher
2016-10-11 12:50 ` [PATCH v27 12/21] richacl: Update the file masks in chmod() Andreas Gruenbacher
2016-10-11 12:50 ` [PATCH v27 13/21] richacl: Check if an acl is equivalent to a file mode Andreas Gruenbacher
2016-10-11 12:50 ` [PATCH v27 14/21] richacl: Create-time inheritance Andreas Gruenbacher
2016-10-11 12:50 ` [PATCH v27 15/21] richacl: Automatic Inheritance Andreas Gruenbacher
2016-10-11 12:50 ` [PATCH v27 16/21] richacl: xattr mapping functions Andreas Gruenbacher
2016-10-11 12:50 ` [PATCH v27 17/21] richacl: Add richacl xattr handler Andreas Gruenbacher
2016-10-11 12:50 ` [PATCH v27 18/21] vfs: Add richacl permission checking Andreas Gruenbacher
2016-10-11 12:50 ` [PATCH v27 19/21] vfs: Move check_posix_acl and check_richacl out of fs/namei.c Andreas Gruenbacher
2016-10-11 12:50 ` [PATCH v27 20/21] ext4: Add richacl support Andreas Gruenbacher
2016-10-11 12:50 ` [PATCH v27 21/21] ext4: Add richacl feature flag Andreas Gruenbacher
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