From atd@us.ibm.com Mon May 5 11:57:49 2025
From: atd@us.ibm.com (Todd Desantis)
Date: Mon, 5 May 2025 10:57:49 +0000
Subject: [OpenAFS-devel] RE: [OpenAFS-announce] URGENT: Call for proposals due 05/05/2025 (for
virtual 2025 OpenAFS Workshop on 06/09-06/10)
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From cwills@sinenomine.net Sat May 17 17:06:48 2025
From: cwills@sinenomine.net (Cheyenne Wills)
Date: Sat, 17 May 2025 10:06:48 -0600
Subject: [OpenAFS-devel] [PATCH] afs, bash: Fix open(O_CREAT) on an
extant AFS file in a sticky dir
In-Reply-To: <433928.1745944651@warthog.procyon.org.uk>
References: <433928.1745944651@warthog.procyon.org.uk>
Message-ID: <20250517100648.3bcd9c1a.cwills@sinenomine.net>
On Tue, 29 Apr 2025 17:37:31 +0100
David Howells <dhowells@redhat.com> wrote:
>
> Bash has a work around in redir_open() that causes open(O_CREAT) of a
> file in a sticky directory to be retried without O_CREAT if bash was
> built with AFS workarounds configured:
>
> #if defined (AFS)
> if ((fd < 0) && (errno == EACCES))
> {
> fd = open (filename, flags & ~O_CREAT, mode);
> errno = EACCES; /* restore errno */
> }
>
> #endif /* AFS */
>
> This works around the kernel not being able to validly check the
> current_fsuid() against i_uid on the file or the directory because the
> uidspaces of the system and of AFS may well be disjoint. The problem
> lies with the uid checks in may_create_in_sticky().
>
> However, the bash work around is going to be removed:
>
> https://git.savannah.gnu.org/cgit/bash.git/tree/redir.c?h=bash-5.3-rc1#n733
>
> ....
>
> This can be tested by creating a sticky directory (the user must have
> a token to do this) and creating a file in it. Then strace bash
> doing "echo foo >>file" and look at whether bash does a single,
> successful O_CREAT open on the file or whether that one fails and
> then bash does one without O_CREAT that succeeds.
>
I performed the following test on 2 systems, one a centos 6 system with
bash 4.1.2 running openafs 1.8.13.1, the other, a current gentoo system
with bash 5.2 (without the "afs" USE option as well) with openafs built
off the master branch.
Within an afs directory:
mkdir testdir
chmod +x testdir
cd testdir
echo "1234" > somefile
echo "abcd" >> somefile << did this while stracing the bash process
I only see one "open" in the strace output:
$ strace -f -o bashtrace -p 1323
Process 1323 attached
^CProcess 1323 detached
$ grep -i open bashtrace
1323 open("somefile", O_WRONLY|O_CREAT|O_APPEND, 0666) = 3
$
So, assuming David's test is correct, it appears that the bash
workaround in redir_open is no longer needed with the more recent
openafs versions.
From cwills@sinenomine.net Sat May 17 17:25:17 2025
From: cwills@sinenomine.net (Cheyenne Wills)
Date: Sat, 17 May 2025 10:25:17 -0600
Subject: [OpenAFS-devel] [PATCH] afs, bash: Fix open(O_CREAT) on an
extant AFS file in a sticky dir
In-Reply-To: <20250517100648.3bcd9c1a.cwills@sinenomine.net>
References: <433928.1745944651@warthog.procyon.org.uk>
<20250517100648.3bcd9c1a.cwills@sinenomine.net>
Message-ID: <20250517102517.7b518c6a.cwills@sinenomine.net>
On Sat, 17 May 2025 10:06:48 -0600
Cheyenne Wills <cwills@sinenomine.net> wrote:
>
> mkdir testdir
> chmod +x testdir
This was really a chmod +t testdir (I didn't do a copy/paste,
but fingerchecked while retyping the commands).
From jaltman@auristor.com Sat May 17 22:04:17 2025
From: jaltman@auristor.com (Jeffrey E Altman)
Date: Sat, 17 May 2025 17:04:17 -0400
Subject: [OpenAFS-devel] [PATCH] afs, bash: Fix open(O_CREAT) on an extant
AFS file in a sticky dir
In-Reply-To: <20250517100648.3bcd9c1a.cwills@sinenomine.net>
References: <433928.1745944651@warthog.procyon.org.uk>
<20250517100648.3bcd9c1a.cwills@sinenomine.net>
Message-ID: <5d3ecbcf-9882-4c66-8f59-723ccdd45113@auristor.com>
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From dhowells@redhat.com Mon May 19 15:43:51 2025
From: dhowells@redhat.com (David Howells)
Date: Mon, 19 May 2025 15:43:51 +0100
Subject: [OpenAFS-devel] [PATCH] afs, bash: Fix open(O_CREAT) on an extant AFS file in a sticky dir
In-Reply-To: <20250517102517.7b518c6a.cwills@sinenomine.net>
References: <20250517102517.7b518c6a.cwills@sinenomine.net> <433928.1745944651@warthog.procyon.org.uk> <20250517100648.3bcd9c1a.cwills@sinenomine.net>
Message-ID: <2979095.1747665831@warthog.procyon.org.uk>
Cheyenne Wills <cwills@sinenomine.net> wrote:
> > mkdir testdir
> > chmod +x testdir
>
> This was really a chmod +t testdir (I didn't do a copy/paste,
> but fingerchecked while retyping the commands).
Did that turn on other-write (o+w) also?
David
From cwills@sinenomine.net Mon May 19 18:46:23 2025
From: cwills@sinenomine.net (Cheyenne Wills)
Date: Mon, 19 May 2025 11:46:23 -0600
Subject: [OpenAFS-devel] [PATCH] afs, bash: Fix open(O_CREAT) on an
extant AFS file in a sticky dir
In-Reply-To: <5d3ecbcf-9882-4c66-8f59-723ccdd45113@auristor.com>
References: <433928.1745944651@warthog.procyon.org.uk>
<20250517100648.3bcd9c1a.cwills@sinenomine.net>
<5d3ecbcf-9882-4c66-8f59-723ccdd45113@auristor.com>
Message-ID: <20250519114623.51850cc2.cwills@sinenomine.net>
Thanks for the additional background information. =20
I wasn't aware of the problem associated with fs/protected_regular (nor
was it, I believe, mentioned in any of the prior messages in the
thread). So I was focusing on trying to figure out if the original
reason why bash added the workaround was still present, and thought
that David's test as an method to check for it.
I'll have to dig into what the needs to be done to add support for
fs/protected_regular in OpenAFS.
--=20
Cheyenne Wills
cwills@sinenomine.net
On Sat, 17 May 2025 17:04:17 -0400
Jeffrey E Altman <jaltman@auristor.com> wrote:
> On 5/17/2025 12:06 PM, Cheyenne Wills wrote:
>=20
> [...] =20
> [...] =20
> [...] =20
>=20
> David's test is for the fs/protected_regular functionality which is=20
> broken with regards to AFS when the local uid namespace and the AFS
> uid namespace are disjoint.=C2=A0 His test is not for the situation which
> caused bash to add the open(flags & ~O_CREAT) fallback logic in 1992.
> The Linux fs/protected_regular functionality is not present in
> CentOS 6 kernel so could not be triggered by the test; and bash on
> gentoo is built without the fallback and the fs/protected_regular
> functionality might not be enabled by default.=C2=A0 It should also be
> noted that the OS for which the bash fallback logic was introduced
> was not Linux.
>=20
> I do not believe that any conclusions can be made from the tests that=20
> have been performed.
>=20
> IBM AFS 3.2 included a client side change to address the narrow use
> case involving AFS ACLs granting only "liw" rights which broke the
> CMU mail delivery system.=C2=A0 However, IBM did not address all of the
> possible scenarios which could result in an O_CREAT open failing with
> EACCES when a ~O_CREAT open would succeed for an existing file.=C2=A0 For
> example, the fileserver will fail MkDir, CreateFile and CreateSymlink
> with EACCES instead of EEXIST if the caller lacks PRSFS_INSERT.=C2=A0 A
> comprehensive analysis of client side behavior in OpenAFS has not
> been performed by AuriStor.
>=20
> Jeffrey Altman
>=20
>=20
From atd@us.ibm.com Thu May 22 19:27:57 2025
From: atd@us.ibm.com (Todd Desantis)
Date: Thu, 22 May 2025 18:27:57 +0000
Subject: [OpenAFS-devel] The Virtual 2025 OpenAFS Workshop on 06/09 Schedule and Registration
Message-ID: <LV3PR15MB63883471F6572FA037AAE1A78A99A@LV3PR15MB6388.namprd15.prod.outlook.com>
--_000_LV3PR15MB63883471F6572FA037AAE1A78A99ALV3PR15MB6388namp_
Content-Type: text/plain; charset="us-ascii"
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Greetings ....
We have finalized the schedule for the OpenAFS Workshop scheduled for June =
9th.
SCHEDULE AND REGISTRATION INFO:
Schedule: The workshop is set for June 9th, 2025. The workshop schedule ha=
s been set and you can view it and register form the following link ::
https://www.openafsfoundation.org/user-events/2025-open=
afs-workshop/<https://www.openafsfoundation.org/user-events/2025-openafs-wo=
rkshop/ >
Registration: The registration is live. If there is even a remote chance yo=
u might attend, you MUST register to receive log-in credentials for zoom. T=
hanks. To register, either use another tab at the same URL (above) or use h=
ttps://www.eventbrite.com/e/2025-openafs-workshop-tickets-1303445062269?aff=
=3Debdssbdestsearch<https://www.eventbrite.com/e/2025-openafs-workshop-tick=
ets-1303445062269?aff=3Debdssbdestsearch > to go directly to EventBrite.
.
We are looking forward to hearing from you... and to seeing you virtually a=
t the workshop itself.
Warm wishes,
Todd DeSantis
The OpenAFS Foundation
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<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif">Greetings ….<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif">We have finalized the schedule for the OpenAFS Worksh=
op scheduled for June 9<sup>th</sup>.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><b><span style=3D"font-family:"Aptos",sans=
-serif;mso-ligatures:none">SCHEDULE AND REGISTRATION INFO:</span></b><span =
style=3D"font-family:"Aptos",sans-serif;mso-ligatures:none"><o:p>=
</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:"Aptos",sans-se=
rif;mso-ligatures:none"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:"Aptos",sans-se=
rif;mso-ligatures:none">Schedule: The workshop is set for June 9th, 2025.&n=
bsp; The workshop schedule has been set and you can view it and register fo=
rm the following link ::<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:"Aptos",sans-se=
rif;mso-ligatures:none"><o:p> </o:p></span></p>
<p class=3D"p1"><span style=3D"font-family:"Aptos",sans-serif">&n=
bsp;  =
; </span>
<u><a href=3D"https://www.openafsfoundation.org/user-events/2025-openafs-wo=
rkshop/"><span style=3D"color:#0563C1">https://www.openafsfoundation.org/us=
er-events/2025-openafs-workshop/</span></a></u> <o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-family:"Aptos",sans-se=
rif;mso-ligatures:none"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:"Aptos",sans-se=
rif;mso-ligatures:none">Registration: The registration is live. If there is=
even a remote chance you might attend, you MUST register to receive log-in=
credentials for zoom. Thanks. To register, either
use another tab at the same URL (above) or use </span><span style=3D"=
font-size:9.0pt;font-family:"Helvetica",sans-serif;mso-ligatures:=
none"><a href=3D"https://www.eventbrite.com/e/2025-openafs-workshop-tickets=
-1303445062269?aff=3Debdssbdestsearch"><span style=3D"color:blue">https://w=
ww.eventbrite.com/e/2025-openafs-workshop-tickets-1303445062269?aff=3Debdss=
bdestsearch</span></a>
to go directly to EventBrite.</span><span style=3D"font-family:"Aptos=
",sans-serif;mso-ligatures:none"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:"Aptos",sans-se=
rif;mso-ligatures:none">.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:"Aptos",sans-se=
rif;mso-ligatures:none">We are looking forward to hearing from you... and t=
o seeing you virtually at the workshop itself.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:"Aptos",sans-se=
rif;mso-ligatures:none"><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:"Aptos",sans-se=
rif;mso-ligatures:none">Warm wishes,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:"Aptos",sans-se=
rif;mso-ligatures:none">Todd DeSantis<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:"Aptos",sans-se=
rif;mso-ligatures:none">The OpenAFS Foundation<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ar=
ial",sans-serif"><o:p> </o:p></span></p>
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