Subject: bug#38654: closed (27.0.50; mml-to-mime may produce faulty email messages)

From: [email-masked] (GNU bug Tracking System)
Date: Tue, 03 Mar 2020 15:13:02 +0000

Your bug report

#38654: 27.0.50; mml-to-mime may produce faulty email messages

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to [email-masked].

-- 
38654: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=38654
GNU Bug Tracking System
Contact [email-masked] with problems

Subject: 27.0.50; mml-to-mime may produce faulty email messages
From: Rainer Gemulla <[email-masked]>
To: [email-masked]
Date: Tue, 03 Mar 2020 16:12:09 +0100
List-Id: <debbugs-submit.debbugs.gnu.org>

Closing to resubmit with a more readable explanation.

Subject: 27.0.50; mml-to-mime may produce faulty email messages
From: "Rainer Gemulla" <[email-masked]>
To: [email-masked]
Date: Tue, 17 Dec 2019 21:16:43 +0000
List-Id: <debbugs-submit.debbugs.gnu.org>

(I am sending this again as HTML so that the MML tags below do not get 
destroyed.)

I found that some email messages that I sent (mostly forwarded messages) 
were incorrectly encoded by Emacs. This error happened inconsistently, 
and (since no user-visible error is thrown), I was unaware of the 
problem for a while. It is also reproducible on eacho of my machines.

After some playing around, I found a way to reproduce:

1. Run: emacs -Q
2. M-x message-mode
3. Clear scratch buffer, then paste message below into scratch buffer
4. M-: (mml-to-mime)
    --> gives correct result
5. Clear scratch buffer, then paste message below into scratch buffer
6. Insert a new line "<#secure method=pgpmime mode=sign>" at start of 
message (after line "--text follows this line--")
7. M-: (mml-to-mime)
   --> throws (expected) signer name error
8. Clear scratch buffer, then paste message below into scratch buffer
9. M-: (mml-to-mime)
   --> wrong result (first Content-Type after "text follows..." is wrong)

I tried to track down the bug and found this piece of code in 
mml-parse-1, line 284:

(setq tag (list 'part '(type . "text/plain"))
       no-markup-p t
       warn t)

During step 9, this statement is executed, but the tag variable is not 
set to the list mentioned in the statement (seriously!). In my case, it 
had value 'Content-Type: multipart/alternative; boundary="====-=-="' 
right afterwards (as in the incorrect result below). At this point I 
gave up, looks like a deeper problem.

BEGIN ORIGINAL MESSAGE
From: [email-masked]
To: [email-masked]
Subject: Test
--text follows this line--
Test

<#mml type=message/rfc822 disposition=inline>
<#multipart type=alternative>
<#part type=text/plain charset="UTF-8" disposition=inline nofile=yes>
Some text.
<#part type=text/html charset="UTF-8" nofile=yes>
Some more text.
<#/multipart>
<#/mml>
END ORIGINAL MESSAGE

BEGIN INCORRECT RESULT AFTER STEP 9
From: [email-masked]
To: [email-masked]
Subject: Test
MIME-Version: 1.0
Content-Type: multipart/mixed; boundary="=-=-="
--text follows this line--
--=-=-=
Content-Type: multipart/alternative; boundary="====-=-="
Content-Transfer-Encoding: base64

VGV4dAoK
--=-=-=
Content-Type: message/rfc822
Content-Disposition: inline

--====-=-=
Content-Disposition: inline
MIME-Version: 1.0
Content-Type: multipart/alternative; boundary="====-=-="

Some text.

--====-=-=
Content-Type: text/html; charset=utf-8

Some more text.

--====-=-=--

--=-=-=--
END INCORRECT RESULT AFTER STEP 9

In GNU Emacs 27.0.50 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.24.4)
  of 2019-12-17 built on potestas
Repository revision: dba1be0a9b3e92717f7921335f8507c007df8ca6
Repository branch: master
Windowing system distributor 'HC-Consult', version 11.0.12001004
System Description: Ubuntu 18.10

Recent messages:
    - ‘edebug-Go-nonstop-mode’ originally mapped on ‘G’
Quit
uncompressing mml.el.gz...done
uncompressing mml.el.gz...done
Searched 0/1 files
Searched 1/1 files
evil-line-move: Beginning of buffer
uncompressing mml.el.gz...done
Sticky Agenda buffer, use ‘r’ to refresh
Created gnus link.
"27.0.50"
Configured using:
  'configure --with-gnutls --with-jpeg --with-png --with-rsvg --with-tiff
  --with-xft --with-xml2 --with-xpm --with-imagemagick --with-xft
  --with-x-toolkit=gtk3 --with-pop --with-mailutils --with-xwidgets
  --with-modules --prefix=/usr/local/stow/emacs-master'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS GLIB
NOTIFY INOTIFY GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS XWIDGETS
LIBSYSTEMD PDUMPER LCMS2 GMP

Important settings:
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Major mode: notmuch-tree

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Features:
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tabulated-list replace newcomment text-mode elisp-mode lisp-mode
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select scroll-bar mouse jit-lock font-lock syntax facemenu font-core
term/tty-colors frame minibuffer cl-generic cham georgian utf-8-lang
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cp51932 hebrew greek romanian slovak czech european ethiopic indian
cyrillic chinese composite charscript charprop case-table epa-hook
jka-cmpr-hook help simple abbrev obarray cl-preloaded nadvice loaddefs
button faces cus-face macroexp files text-properties overlay sha1 md5
base64 format env code-pages mule custom widget hashtable-print-readable
backquote threads dbusbind inotify lcms2 dynamic-setting
system-font-setting font-render-setting xwidget-internal move-toolbar
gtk x-toolkit x multi-tty make-network-process emacs)

Memory information:
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