Debian Bug report logs - #839220
xterm: Using allowC1Printable (-k8) can disable UTF-8 support

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Message #5 received at [email protected] (full text, mbox, reply):

From: Vincent Lefevre <[email protected]>

To: Debian Bug Tracking System <[email protected]>

Subject: xterm: Using allowC1Printable (-k8) can disable UTF-8 support

Date: Fri, 30 Sep 2016 11:24:53 +0200

Package: xterm
Version: 326-1
Severity: important

If allowC1Printable (-k8 option) is used, then UTF-8 support can be
disabled if some escape sequence (e.g. from a binary file) is sent,
which can make the terminal unusable. Example:

  xterm -k8 -hold -e printf "\x1b\xa5@\xc3\xa9\n"

which shows "é" instead of "é". And with Ctrl + right click, one can
see that "UTF-8 Encoding" is no longer set.

The xterm(1) man page just says:

    -k8    This option sets the allowC1Printable resource.  When
           allowC1Printable is set, xterm overrides the mapping of C1
           control characters (code 128-159) to treat them as printable.

So, this option should be regarded as safe.

-- System Information:
Debian Release: stretch/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'stable-updates'), (500, 'unstable'), (500, 'testing'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.7.0-1-amd64 (SMP w/12 CPU cores)
Locale: LANG=POSIX, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages xterm depends on:
ii  libc6           2.24-3
ii  libfontconfig1  2.11.0-6.7
ii  libice6         2:1.0.9-1+b1
ii  libtinfo5       6.0+20160917-1
ii  libutempter0    1.1.6-3
ii  libx11-6        2:1.6.3-1
ii  libxaw7         2:1.0.13-1
ii  libxft2         2.3.2-1
ii  libxinerama1    2:1.1.3-1+b1
ii  libxmu6         2:1.1.2-2
ii  libxpm4         1:3.5.11-1+b1
ii  libxt6          1:1.1.5-1
ii  xbitmaps        1.1.1-2

Versions of packages xterm recommends:
ii  x11-utils  7.7+3

Versions of packages xterm suggests:
pn  xfonts-cyrillic  <none>

-- no debconf information

Message #10 received at [email protected] (full text, mbox, reply):

From: Sven Joachim <[email protected]>

To: [email protected]

Subject: Bug#839220: fixed in xterm 327-1

Date: Sun, 09 Oct 2016 10:12:26 +0000

Source: xterm
Source-Version: 327-1

We believe that the bug you reported is fixed in the latest version of
xterm, which is due to be installed in the Debian FTP archive.

A summary of the changes between this version and the previous one is
attached.

Thank you for reporting the bug, which will now be closed.  If you
have further comments please address them to [email protected],
and the maintainer will reopen the bug report if appropriate.

Debian distribution maintenance software
pp.
Sven Joachim <[email protected]> (supplier of updated xterm package)

(This message was generated automatically at their request; if you
believe that there is a problem with it please contact the archive
administrators by mailing [email protected])


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512

Format: 1.8
Date: Sun, 09 Oct 2016 11:25:56 +0200
Source: xterm
Binary: xterm
Architecture: source
Version: 327-1
Distribution: unstable
Urgency: medium
Maintainer: Debian X Strike Force <[email protected]>
Changed-By: Sven Joachim <[email protected]>
Description:
 xterm      - X terminal emulator
Closes: 738794 839220
Changes:
 xterm (327-1) unstable; urgency=medium
 .
   * New upstream release.
     - Add a check in the function which handles end-of-line wrapping
       to ensure that C1 controls are allocated one column when
       allowC1Printable is set (Closes: #738794).
     - Modify allowC1Printable to disallow codes 160-254 as being equivalent
       to codes 32-126 when parsing escape sequences (Closes: #839220).
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