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Bug#1067022: man2html: Segmentation fault with tzfile(5)
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From: |
Alejandro Colomar |
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Subject: |
Bug#1067022: man2html: Segmentation fault with tzfile(5) |
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Date: |
Sun, 17 Mar 2024 00:06:38 +0100 |
Package: man2html
Version: 1.6g-16
Severity: normal
Tags: upstream
X-Debbugs-Cc: Alejandro Colomar <alx@kernel.org>, Paul Eggert
<eggert@cs.ucla.edu>, "G. Branden Robinson" <branden@debian.org>,
linux-man@vger.kernel.org, groff@gnu.org, tz@iana.org
Dear Maintainer,
The page tzfile(5) from tzdb-2024a manages to consistently produce a
Segmentation fault with man2html(1). Below is a reproducer:
alx@debian:~/tmp$ wget
https://data.iana.org/time-zones/releases/tzdb-2024a.tar.lz 2>/dev/null
alx@debian:~/tmp$ tar xf tzdb-2024a.tar.lz
alx@debian:~/tmp$ man2html tzdb-2024a/tzfile.5
Content-type: text/html; charset=UTF-8
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<HTML><HEAD><TITLE>Man page of tzfile</TITLE>
</HEAD><BODY>
<H1>tzfile</H1>
Section: File Formats (5)<BR>Updated: <BR><A HREF="#index">Index</A>
<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
<A NAME="lbAB"> </A>
<H2>NAME</H2>
tzfile - timezone information
<A NAME="lbAC"> </A>
<H2>DESCRIPTION</H2>
The timezone information files used by
<B><A HREF="/cgi-bin/man/man2html?3+tzset">tzset</A></B>(3)
are typically found under a directory with a name like
<I>/usr/share/zoneinfo</I>.
These files use the format described in Internet RFC 8536.
Each file is a sequence of 8-bit bytes.
In a file, a binary integer is represented by a sequence of one or
more bytes in network order (bigendian, or high-order byte first),
with all bits significant,
a signed binary integer is represented using two's complement,
and a boolean is represented by a one-byte binary integer that is
either 0 (false) or 1 (true).
The format begins with a 44-byte header containing the following fields:
Segmentation fault
alx@debian:~/tmp$ dpkg -l | grep man2html
ii man2html 1.6g-16
amd64 browse man pages in your web browser
ii man2html-base 1.6g-16
amd64 convert man pages into HTML format
I've refreshed this page today, and the previous version I used didn't
have this crash. Below is the part of the diff that I think is
responsible for the crash:
diff --git a/man5/tzfile.5 b/man5/tzfile.5
index 45afecc10..867348d67 100644
--- a/man5/tzfile.5
+++ b/man5/tzfile.5
@@ -26,23 +26,24 @@ .SH DESCRIPTION
and a boolean is represented by a one-byte binary integer that is
either 0 (false) or 1 (true).
The format begins with a 44-byte header containing the following
fields:
-.IP * 2
+.RS "\w' 'u"
+.IP \(bu "\w'\(bu 'u"
The magic four-byte ASCII sequence
.q "TZif"
identifies the file as a timezone information file.
BTW, I noticed that the upstream homepage is dead:
<http://users.actrix.gen.nz/michael/vhman2html.html>.
Is this project defunct?
Have a lovely day!
Alex
-- System Information:
Debian Release: trixie/sid
APT prefers unstable
APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Kernel: Linux 6.8.0-rc7-alx-dirty (SMP w/24 CPU threads; PREEMPT)
Locale: LANG=C.utf8, LC_CTYPE=C.utf8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Versions of packages man2html depends on:
ii debconf [debconf-2.0] 1.5.86
ii gawk 1:5.2.1-2
ii libc6 2.37-15.1
ii lynx 2.9.0rel.0-2+b1
ii man-db 2.12.0-3
ii man2html-base 1.6g-16
ii sensible-utils 0.0.22
man2html recommends no packages.
Versions of packages man2html suggests:
ii firefox-esr [www-browser] 115.8.0esr-1+b1
ii lynx [www-browser] 2.9.0rel.0-2+b1
pn swish++ <none>
ii w3m [www-browser] 0.5.3+git20230121-2+b3
-- debconf information:
man2html/index_manpages: true
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