GNU bug report logs - #13329
24.2 post patch for #9521; Rmail forward does not correctly handle MIME messages containing "From " lines

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Package: emacs; Severity: minor; Reported by: mdl@HIDDEN; Keywords: moreinfo; Done: Eli Zaretskii <eliz@HIDDEN>; Maintainer for emacs is bug-gnu-emacs@HIDDEN.

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Date: Fri, 10 Jun 2022 14:28:06 +0300
Message-Id: <83sfoczrjt.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
To: Lars Ingebrigtsen <larsi@HIDDEN>
In-Reply-To: <87r13wu6gx.fsf@HIDDEN> (message from Lars Ingebrigtsen on Fri, 
 10 Jun 2022 13:02:22 +0200)
Subject: Re: bug#13329: 24.2 post patch for #9521; Rmail forward does not
 correctly handle MIME messages containing "From " lines
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> From: Lars Ingebrigtsen <larsi@HIDDEN>
> Cc: mdl@HIDDEN,  13329 <at> debbugs.gnu.org
> Date: Fri, 10 Jun 2022 13:02:22 +0200
> 
> Eli Zaretskii <eliz@HIDDEN> writes:
> 
> > Here is your message, forwarded as MIME by Rmail (I just edited the
> > Subject, to avoid creating a new bug report).  Did you receive it
> > OK?
> 
> Yup; looks fine.

Then I guess this problem no longer exists, and we can close this bug;
done.
Notification sent to mdl@HIDDEN:
bug acknowledged by developer. Full text available.
Reply sent to Eli Zaretskii <eliz@HIDDEN>:
You have taken responsibility. Full text available.

Message received at 13329 <at> debbugs.gnu.org:


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From: Lars Ingebrigtsen <larsi@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#13329: 24.2 post patch for #9521; Rmail forward does not
 correctly handle MIME messages containing "From " lines
References: <83tu8szstn.fsf@HIDDEN>
X-Now-Playing: Arthur Russell's _Sketches For World Of Echo (June 25 1984
 Live At Ei)_: "Sunlit Water (Live 6-24-84)"
Date: Fri, 10 Jun 2022 13:02:22 +0200
In-Reply-To: <83tu8szstn.fsf@HIDDEN> (Eli Zaretskii's message of "Fri, 10 Jun
 2022 14:00:36 +0300")
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 @@CONTACT_ADDRESS@@ for details.
 Content preview:  Eli Zaretskii <eliz@HIDDEN> writes: > Here is your message, 
 forwarded as MIME by Rmail (I just edited the > Subject, to avoid creating
 a new bug report). Did you receive it > OK? Yup; looks fine. 
 Content analysis details:   (-2.9 points, 5.0 required)
 pts rule name              description
 ---- ---------------------- --------------------------------------------------
 -1.0 ALL_TRUSTED            Passed through trusted hosts only via SMTP
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Eli Zaretskii <eliz@HIDDEN> writes:

> Here is your message, forwarded as MIME by Rmail (I just edited the
> Subject, to avoid creating a new bug report).  Did you receive it
> OK?

Yup; looks fine.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#13329; Package emacs. Full text available.

Message received at 13329 <at> debbugs.gnu.org:


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From: Eli Zaretskii <eliz@HIDDEN>
To: Lars Ingebrigtsen <larsi@HIDDEN>
Subject: Re: bug#13329: 24.2 post patch for #9521; Rmail forward does not
 correctly handle MIME messages containing "From " lines
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--=-=-=
Content-Type: text/plain

Here is your message, forwarded as MIME by Rmail (I just edited the
Subject, to avoid creating a new bug report).  Did you receive it
OK?


--=-=-=
Content-Type: message/rfc822
Content-Disposition: inline
Content-Transfer-Encoding: 8bit

From: Lars Ingebrigtsen <larsi@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Cc: mdl@HIDDEN,  13329 <at> debbugs.gnu.org
Subject: Re: bug#13329: 24.2 post patch for #9521; Rmail forward does not
 correctly handle MIME messages containing "From " lines
Date: Fri, 10 Jun 2022 11:24:27 +0200
MIME-Version: 1.0
Content-Type: text/plain

Eli Zaretskii <eliz@HIDDEN> writes:

> At this point I can only say that I'm forwarding email with MIME
> attachments quite a lot, and didn't spot any problems, although I
> admit there's not a lot of ">>...>From" in them.

Here's a message with a From line:

>From thing lala yes

If you can forward this as MIME in rmail, then I think the bug has been
fixed?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no


--=-=-=--
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#13329; Package emacs. Full text available.

Message received at 13329 <at> debbugs.gnu.org:


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From: Lars Ingebrigtsen <larsi@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>
Subject: Re: bug#13329: 24.2 post patch for #9521; Rmail forward does not
 correctly handle MIME messages containing "From " lines
References: <87r4m4tucm.fsf@HIDDEN> <87czglin8i.fsf@HIDDEN>
 <87czfhzreo.fsf@HIDDEN> <83bkv111n6.fsf@HIDDEN>
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Date: Fri, 10 Jun 2022 11:24:27 +0200
In-Reply-To: <83bkv111n6.fsf@HIDDEN> (Eli Zaretskii's message of "Fri, 10 Jun
 2022 09:19:25 +0300")
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 has NOT identified this incoming email as spam.  The original
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 similar future email.  If you have any questions, see
 @@CONTACT_ADDRESS@@ for details.
 Content preview:  Eli Zaretskii <eliz@HIDDEN> writes: > At this point I can
 only say that I'm forwarding email with MIME > attachments quite a lot, and
 didn't spot any problems, although I > admit there's not a lot of ">>...>From"
 in them. 
 Content analysis details:   (-2.9 points, 5.0 required)
 pts rule name              description
 ---- ---------------------- --------------------------------------------------
 -1.0 ALL_TRUSTED            Passed through trusted hosts only via SMTP
 -1.9 BAYES_00               BODY: Bayes spam probability is 0 to 1%
 [score: 0.0000]
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Eli Zaretskii <eliz@HIDDEN> writes:

> At this point I can only say that I'm forwarding email with MIME
> attachments quite a lot, and didn't spot any problems, although I
> admit there's not a lot of ">>...>From" in them.

Here's a message with a From line:

From thing lala yes

If you can forward this as MIME in rmail, then I think the bug has been
fixed?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#13329; Package emacs. Full text available.

Message received at 13329 <at> debbugs.gnu.org:


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Date: Fri, 10 Jun 2022 09:19:25 +0300
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From: Eli Zaretskii <eliz@HIDDEN>
To: Lars Ingebrigtsen <larsi@HIDDEN>
In-Reply-To: <87czfhzreo.fsf@HIDDEN> (message from Lars Ingebrigtsen on Thu, 
 09 Jun 2022 19:18:55 +0200)
Subject: Re: bug#13329: 24.2 post patch for #9521; Rmail forward does not
 correctly handle MIME messages containing "From " lines
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> From: Lars Ingebrigtsen <larsi@HIDDEN>
> Cc: Eli Zaretskii <eliz@HIDDEN>,  13329 <at> debbugs.gnu.org
> Date: Thu, 09 Jun 2022 19:18:55 +0200
> 
> Lars Ingebrigtsen <larsi@HIDDEN> writes:
> 
> >>     If you forward a Rmail message containing a MIME message with "From "
> >> lines, the mbox escaping of From lines is not properly done.
> >
> > (I'm going through old bug reports that unfortunately weren't resolved
> > at the time.)
> >
> > I don't use rmail much myself, but I vaguely recall that there was a
> > similar bug report about this, and that this had been fixed at some
> > point.
> >
> > Perhaps Eli remembers; added to the CCs.
> 
> This was a month ago -- Eli, do you remember?

I don't remember, sorry.  I also didn't see anything pertinent in the
Git logs.

Moreover, upon re-reading the original report several times, I don't
think I understand what exactly is the bug: the original report is a
multipart message which is hard to parse.  It also shows what I think
is a single message, but says "The result should be 3 messages", which
left me utterly confused.

I'd prefer to have a description with 2 attachments: the original
message, and the forwarded message.  And the description should tell
in full what was expected to be seen, and why, preferably without
using ellipsis and hard-to-understand terminology such as "under
mboxrd".

Is it possible to get such a detailed report?  Then I could try the
messages here and see if there's still a problem left in our current
sources.

At this point I can only say that I'm forwarding email with MIME
attachments quite a lot, and didn't spot any problems, although I
admit there's not a lot of ">>...>From" in them.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#13329; Package emacs. Full text available.

Message received at 13329 <at> debbugs.gnu.org:


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From: Lars Ingebrigtsen <larsi@HIDDEN>
To: Mark Lillibridge <mdl@HIDDEN>
Subject: Re: bug#13329: 24.2 post patch for #9521; Rmail forward does not
 correctly handle MIME messages containing "From " lines
References: <87r4m4tucm.fsf@HIDDEN> <87czglin8i.fsf@HIDDEN>
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Date: Thu, 09 Jun 2022 19:18:55 +0200
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 Content preview: Lars Ingebrigtsen <larsi@HIDDEN> writes: >> If you forward
 a Rmail message containing a MIME message with "From " >> lines, the mbox
 escaping of From lines is not properly done. > > (I'm going through old bug
 reports that unfortunately weren [...] 
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Lars Ingebrigtsen <larsi@HIDDEN> writes:

>>     If you forward a Rmail message containing a MIME message with "From "
>> lines, the mbox escaping of From lines is not properly done.
>
> (I'm going through old bug reports that unfortunately weren't resolved
> at the time.)
>
> I don't use rmail much myself, but I vaguely recall that there was a
> similar bug report about this, and that this had been fixed at some
> point.
>
> Perhaps Eli remembers; added to the CCs.

This was a month ago -- Eli, do you remember?
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#13329; Package emacs. Full text available.
Added tag(s) moreinfo. Request was from Lars Ingebrigtsen <larsi@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

Message received at 13329 <at> debbugs.gnu.org:


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From: Lars Ingebrigtsen <larsi@HIDDEN>
To: Mark Lillibridge <mdl@HIDDEN>
Subject: Re: bug#13329: 24.2 post patch for #9521; Rmail forward does not
 correctly handle MIME messages containing "From " lines
References: <87r4m4tucm.fsf@HIDDEN>
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 escaping of From lines is not properly done. (I'm going through old bug
 reports that unfortunately weren't resolved at the time.) 
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Mark Lillibridge <mdl@HIDDEN> writes:

>     If you forward a Rmail message containing a MIME message with "From "
> lines, the mbox escaping of From lines is not properly done.

(I'm going through old bug reports that unfortunately weren't resolved
at the time.)

I don't use rmail much myself, but I vaguely recall that there was a
similar bug report about this, and that this had been fixed at some
point.

Perhaps Eli remembers; added to the CCs.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#13329; Package emacs. Full text available.

Message received at submit <at> debbugs.gnu.org:


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From: Mark Lillibridge <mdl@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: 24.2 post patch for #9521;
	Rmail forward does not correctly handle MIME messages containing
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Date: Tue, 01 Jan 2013 14:24:25 -0800
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--=-=-=
Content-Type: text/plain


[|'s added to quote From lines]

    If you forward a Rmail message containing a MIME message with "From "
lines, the mbox escaping of From lines is not properly done.


    Start emacs -q then evaluate the 9521 patch:

(require 'rmailmm)

(defun rmail-insert-mime-forwarded-message (forward-buffer)
  "Insert the message in FORWARD-BUFFER as a forwarded message.
This is the usual value of `rmail-insert-mime-forwarded-message-function'."
  (let ((message-buffer
	 (with-current-buffer forward-buffer
	   (if rmail-buffer-swapped
	       rmail-view-buffer
	     forward-buffer))))
    (save-restriction
      (narrow-to-region (point) (point))
      (message-forward-make-body-mime message-buffer))))


    Then run Rmail on the following mbox file (remove |'s at line start
first):

|From mdl  Wed Oct 26 10:18:58 2011
|X-RMAIL-ATTRIBUTES: --EF----
|X-RMAIL-KEYWORDS: *
|X-Spam-Status: No, score=-4.7 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_MED,
|	RP_MATCHES_RCVD autolearn=unavailable version=3.3.1
|From: Mark Lillibridge <mark.lillibridge <at> hp.com>
|To: <bug-gnu-emacs <at> gnu.org>
|Subject: 23.3; rmail-edit-current-message adds extra '>'s to Froms...
|Date: Sat, 22 Oct 2011 12:05:57 -0700
|Reply-To: <mark.lillibridge <at> hp.com>
|
|
|Start with a Rmail message (this one will do) not containing MIME that
|contains lines like the following:
|
|>From level 1
|>>From level 2
|>>>From level 3
|
|From mdl  Tue Jan  1 12:27:17 2013
|Delivered-To: lillibridge <at> gmail.com
|Received: from gmail-pop.l.google.com [74.125.25.108]
|	by foil.strangled.net with POP3 (fetchmail-6.3.18)
|	for <mdl <at> localhost> (single-drop); Tue, 01 Jan 2013 12:27:17 -0800 (PST)
|Received: by 10.49.49.9 with SMTP id q9csp680843qen;
|        Tue, 1 Jan 2013 12:27:08 -0800 (PST)
|X-Received: by 10.52.69.201 with SMTP id g9mr59443696vdu.98.1357072028236;
|        Tue, 01 Jan 2013 12:27:08 -0800 (PST)
|Return-Path: <mark.lillibridge <at> hp.com>
|Received: from alum-mailsec-relay-12.mit.edu (ALUM-MAILSEC-RELAY-12.MIT.EDU. [18.7.68.32])
|        by mx.google.com with ESMTPS id o8si46143160vdv.77.2013.01.01.12.27.08
|        (version=TLSv1/SSLv3 cipher=OTHER);
|        Tue, 01 Jan 2013 12:27:08 -0800 (PST)
|Received: from alum-mailsec-scanner-7.mit.edu (ALUM-MAILSEC-SCANNER-7.MIT.EDU [18.7.68.19])
|	by alum-mailsec-relay-12.mit.edu (8.13.8/8.12.8) with ESMTP id r01KR7kv027035
|	for <mdl <at> alum.mit.edu>; Tue, 1 Jan 2013 15:27:07 -0500
|Received: from madara.hpl.hp.com (madara.hpl.hp.com [192.6.19.124])
|	by alum-mailsec-scanner-7.mit.edu (Symantec Messaging Gateway) with SMTP id A5.53.02235.B9643E05; Tue,  1 Jan 2013 15:27:07 -0500 (EST)
|Received: from postal.hpl.hp.com (postal.hpl.hp.com [15.25.115.25])
|	by madara.hpl.hp.com (8.14.4/8.14.4/HPL-PA Relay) with ESMTP id r01KR5Ae021394
|	(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT)
|	for <mdl <at> alum.mit.edu>; Tue, 1 Jan 2013 12:27:06 -0800
|Received: from build-debian-1.u.hpl.hp.com (build-debian-1.u.hpl.hp.com [15.8.240.3])
|	by postal.hpl.hp.com (8.14.3/8.14.3/HPL-PA Hub) with ESMTP id r01KR4Df022085;
|	Tue, 1 Jan 2013 12:27:04 -0800
|From: Mark Lillibridge <mark.lillibridge <at> hp.com>
|To: mdl <at> alum.mit.edu
|Subject: test message containing From's in an attachment
|Reply-to: mark.lillibridge <at> hp.com
|Date: Tue, 01 Jan 2013 12:27:04 -0800
|Message-ID: <qmhip7gmyxz.fsf <at> build-debian-1.u.hpl.hp.com>
|MIME-Version: 1.0
|Content-Type: text/plain
|Content-Disposition: attachment; filename=froms.txt
|X-RMAIL-ATTRIBUTES: ------U-
|
|>From level 1
|>>From level 2
|>>>From level 3
|
|From mdl  Tue Jan  1 13:04:30 2013
|Delivered-To: lillibridge <at> gmail.com
|Received: from gmail-pop.l.google.com [74.125.25.108]
|	by foil.strangled.net with POP3 (fetchmail-6.3.18)
|	for <mdl <at> localhost> (single-drop); Tue, 01 Jan 2013 13:04:30 -0800 (PST)
|Received: by 10.49.49.9 with SMTP id q9csp681694qen;
|        Tue, 1 Jan 2013 13:04:13 -0800 (PST)
|X-Received: by 10.52.75.100 with SMTP id b4mr59369212vdw.52.1357074253041;
|        Tue, 01 Jan 2013 13:04:13 -0800 (PST)
|Return-Path: <mark.lillibridge <at> hp.com>
|Received: from alum-mailsec-relay-12.mit.edu (ALUM-MAILSEC-RELAY-12.MIT.EDU. [18.7.68.32])
|        by mx.google.com with ESMTPS id u1si24918746vdh.137.2013.01.01.13.04.12
|        (version=TLSv1/SSLv3 cipher=OTHER);
|        Tue, 01 Jan 2013 13:04:13 -0800 (PST)
|Received: from alum-mailsec-scanner-3.mit.edu (ALUM-MAILSEC-SCANNER-3.MIT.EDU [18.7.68.14])
|	by alum-mailsec-relay-12.mit.edu (8.13.8/8.12.8) with ESMTP id r01L47Pu030367
|	for <mdl <at> alum.mit.edu>; Tue, 1 Jan 2013 16:04:12 -0500
|Authentication-Results: symauth.service.identifier
|Received: from madara.hpl.hp.com (madara.hpl.hp.com [192.6.19.124])
|	by alum-mailsec-scanner-3.mit.edu (Symantec Messaging Gateway) with SMTP id E2.ED.02222.B4F43E05; Tue,  1 Jan 2013 16:04:12 -0500 (EST)
|Received: from masterns.hpl.hp.com (masterns.hpl.hp.com [15.0.48.4])
|	by madara.hpl.hp.com (8.14.4/8.14.4/HPL-PA Relay) with ESMTP id r01L4Auq022776
|	(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT)
|	for <mdl <at> alum.mit.edu>; Tue, 1 Jan 2013 13:04:10 -0800
|Received: from build-debian-1.u.hpl.hp.com (build-debian-1.u.hpl.hp.com [15.8.240.3])
|	by masterns.hpl.hp.com (8.14.3/8.14.3/HPL-PA Hub) with ESMTP id r01L47j3018514;
|	Tue, 1 Jan 2013 13:04:08 -0800
|From: Mark Lillibridge <mark.lillibridge <at> hp.com>
|To: mdl <at> alum.mit.edu
|Subject: test message containing From's in an attachment
|Reply-to: mark.lillibridge <at> hp.com
|Date: Tue, 01 Jan 2013 13:04:07 -0800
|Message-ID: <qmhhan0mx88.fsf <at> build-debian-1.u.hpl.hp.com>
|MIME-Version: 1.0
|Content-Type: multipart/mixed; boundary="=-=-="
|X-RMAIL-ATTRIBUTES: --------
|
|--=-=-=
|Content-Type: text/plain
|
|
|body part
|
|
|--=-=-=
|Content-Type: text/plain
|Content-Disposition: attachment; filename=froms.txt
|
|>From level 1
|>>From level 2
|>>>From level 3
|
|--=-=-=--
|

    The result should be 3 messages.  If you forward any of the
messages, you'll see that the resulting message has the form:

|To: 
|...
|
|
--=-=-=
Content-Type: message/rfc822
Content-Disposition: inline
Content-Transfer-Encoding: 8bit

|X-From-Line: mdl  Tue Jan  1 13:04:30 2013
|Delivered-To: lillibridge@HIDDEN

|>From level 1
|>>From level 2
|>>>From level 3
|...
|
--=-=-=
Content-Type: text/plain


Note that the From lines should be under mboxrd:

|From level 1
|>From level 2
|>>From level 3


    See #13328 for related discussion of properly decoding From lines in
MIME messages.

- Mark

--=-=-=--
Acknowledgement sent to mdl@HIDDEN:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#13329; Package emacs. Full text available.
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