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Registered in England and Wales under Company Registration No. 3798903 From: David Howells In-Reply-To: <4bdf58bd593d9a54aa20760fd49aaa1df57ef216.camel@linux.ibm.com> References: <4bdf58bd593d9a54aa20760fd49aaa1df57ef216.camel@linux.ibm.com> <20260728141344.1811120-1-dhowells@redhat.com> <20260728141344.1811120-2-dhowells@redhat.com> To: Mimi Zohar Cc: dhowells@redhat.com, Al Viro , Christian Brauner , Marc Dionne , Jeffrey Altman , Steve French , linux-afs@lists.infradead.org, openafs-devel@openafs.org, linux-cifs@vger.kernel.org, linux-nfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Etienne Champetier , Chet Ramey , Cheyenne Wills , Christian Brauner , linux-integrity@vger.kernel.org Subject: Re: [PATCH v3 1/2] vfs: Allow filesystems with foreign owner IDs to override UID checks Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <986907.1786540374.1@warthog.procyon.org.uk> Date: Wed, 12 Aug 2026 14:12:54 +0100 Message-ID: <986908.1786540374@warthog.procyon.org.uk> X-Scanned-By: MIMEDefang 3.6 on 10.30.177.95 Mimi Zohar wrote: > On Tue, 2026-07-28 at 15:13 +0100, David Howells wrote: > > > > (*) IMA policy ops. > > > > Unchanged for now. I'm not sure what the best way to deal with this > > is - if, indeed, it needs any changes. > > IMA policy rules may be written in terms of the uid, euid and fowner. Any > changes, if necessary, would need to be made to ima_match_rules(). I think I can probably leave this for now as using uids mapped through the namespace mapping mechanism. To do otherwise would, I think, require the possibility of encoding foreign IDs in IMA rules. Something to consider in the future, maybe, but I don't think I need to deal with that here. Possibly, we could make a general rule that "for any otherwise unmapped foreign ID, do X" sort of thing. David