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Message-ID: <0609c7e9-4584-4496-9a13-09660dc16d1c@auristor.com>
Date: Thu, 30 May 2024 13:25:26 -0400
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Subject: Re: [PATCH] afs: Don't cross .backup mountpoint from backup volume
To: Christian Brauner <brauner@kernel.org>
Cc: Jan Henrik Sylvester <jan.henrik.sylvester@uni-hamburg.de>,
 Markus Suvanto <markus.suvanto@gmail.com>,
 Marc Dionne <marc.dionne@auristor.com>, linux-afs@lists.infradead.org,
 linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
 linux-stable <stable@vger.kernel.org>, David Howells <dhowells@redhat.com>
References: <768760.1716567475@warthog.procyon.org.uk>
Content-Language: en-US
From: Jeffrey E Altman <jaltman@auristor.com>
Organization: AuriStor, Inc.
In-Reply-To: <768760.1716567475@warthog.procyon.org.uk>
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    On 5/24/2024 12:17 PM, David Howells wrote:<br>
    <blockquote type=3D"cite"
      cite=3D"mid:768760.1716567475@warthog.procyon.org.uk">
      <pre class=3D"moz-quote-pre" wrap=3D"">Hi Christian,

Can you pick this up, please?

Thanks,
David
---
From: Marc Dionne <a class=3D"moz-txt-link-rfc2396E" href=3D"mailto:marc.=
dionne@auristor.com">&lt;marc.dionne@auristor.com&gt;</a>

afs: Don't cross .backup mountpoint from backup volume

Don't cross a mountpoint that explicitly specifies a backup volume
(target is &lt;vol&gt;.backup) when starting from a backup volume.

It it not uncommon to mount a volume's backup directly in the volume
itself.  This can cause tools that are not paying attention to get
into a loop mounting the volume onto itself as they attempt to
traverse the tree, leading to a variety of problems.

This doesn't prevent the general case of loops in a sequence of
mountpoints, but addresses a common special case in the same way
as other afs clients.

Reported-by: Jan Henrik Sylvester <a class=3D"moz-txt-link-rfc2396E" href=
=3D"mailto:jan.henrik.sylvester@uni-hamburg.de">&lt;jan.henrik.sylvester@=
uni-hamburg.de&gt;</a>
Link: <a class=3D"moz-txt-link-freetext" href=3D"http://lists.infradead.o=
rg/pipermail/linux-afs/2024-May/008454.html">http://lists.infradead.org/p=
ipermail/linux-afs/2024-May/008454.html</a>
Reported-by: Markus Suvanto <a class=3D"moz-txt-link-rfc2396E" href=3D"ma=
ilto:markus.suvanto@gmail.com">&lt;markus.suvanto@gmail.com&gt;</a>
Link: <a class=3D"moz-txt-link-freetext" href=3D"http://lists.infradead.o=
rg/pipermail/linux-afs/2024-February/008074.html">http://lists.infradead.=
org/pipermail/linux-afs/2024-February/008074.html</a>
Signed-off-by: Marc Dionne <a class=3D"moz-txt-link-rfc2396E" href=3D"mai=
lto:marc.dionne@auristor.com">&lt;marc.dionne@auristor.com&gt;</a>
Signed-off-by: David Howells <a class=3D"moz-txt-link-rfc2396E" href=3D"m=
ailto:dhowells@redhat.com">&lt;dhowells@redhat.com&gt;</a>
Reviewed-by: Jeffrey Altman <a class=3D"moz-txt-link-rfc2396E" href=3D"ma=
ilto:jaltman@auristor.com">&lt;jaltman@auristor.com&gt;</a>
cc: <a class=3D"moz-txt-link-abbreviated" href=3D"mailto:linux-afs@lists.=
infradead.org">linux-afs@lists.infradead.org</a>
---
 fs/afs/mntpt.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/fs/afs/mntpt.c b/fs/afs/mntpt.c
index 97f50e9fd9eb..297487ee8323 100644
--- a/fs/afs/mntpt.c
+++ b/fs/afs/mntpt.c
@@ -140,6 +140,11 @@ static int afs_mntpt_set_params(struct fs_context *f=
c, struct dentry *mntpt)
 		put_page(page);
 		if (ret &lt; 0)
 			return ret;
+
+		/* Don't cross a backup volume mountpoint from a backup volume */
+		if (src_as-&gt;volume &amp;&amp; src_as-&gt;volume-&gt;type =3D=3D AFS=
VL_BACKVOL &amp;&amp;
+		    ctx-&gt;type =3D=3D AFSVL_BACKVOL)
+			return -ENODEV;
 	}
=20
 	return 0;
</pre>
    </blockquote>
    <p><font face=3D"Gill Sans MT">Please add <br>
      </font></p>
    <p><font face=3D"Gill Sans MT">=C2=A0 cc: <a class=3D"moz-txt-link-ab=
breviated" href=3D"mailto:stable@vger.kernel.org">stable@vger.kernel.org<=
/a></font></p>
    <p><font face=3D"Gill Sans MT">when it is applied to vfs-fixes.</font=
></p>
    <p><font face=3D"Gill Sans MT">Thank you.</font></p>
    <p><font face=3D"Gill Sans MT">Jeffrey Altman</font></p>
    <p><font face=3D"Gill Sans MT"><br>
      </font></p>
    <span style=3D"white-space: pre-wrap">
</span>
  </body>
</html>

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