linux-kernel - Re: [PATCH v2 2/3] exportfs: allow fs to disable CAP_DAC_READ

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Message-ID: <ZzV-oVtytT28gHz2@infradead.org>
Date: Wed, 13 Nov 2024 20:37:53 -0800
From: Christoph Hellwig <hch@...radead.org>
To: Erin Shepherd <erin.shepherd@....eu>
Cc: Christian Brauner <brauner@...nel.org>,
	Alexander Viro <viro@...iv.linux.org.uk>, Jan Kara <jack@...e.cz>,
	Chuck Lever <chuck.lever@...cle.com>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, Jeff Layton <jlayton@...nel.org>,
	Amir Goldstein <amir73il@...il.com>, linux-nfs@...r.kernel.org
Subject: Re: [PATCH v2 2/3] exportfs: allow fs to disable CAP_DAC_READ_SEARCH
 check

On Wed, Nov 13, 2024 at 05:55:24PM +0000, Erin Shepherd wrote:
> For pidfs, there is no reason to restrict file handle decoding by
> CAP_DAC_READ_SEARCH.

Why is there no reason, i.e. why do you think it is safe.

>Introduce an export_ops flag that can indicate
> this

Also why is is desirable?

To be this looks more than sketchy with the actual exporting hat on,
but I guess that's now how the cool kids use open by handle these days.