Your message dated Sun, 5 Jun 2022 18:42:13 +0200
with message-id <[email protected]>
and subject line Re: Bug#882386: avahi-daemon segfaults with txt-record values
ending in "="
has caused the Debian Bug report #882386,
regarding avahi-daemon segfaults with txt-record values ending in "="
to be marked as done.
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--
882386: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=882386
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: avahi-daemon
Version: 0.7-3
Severity: important
I have a custom service file, "/etc/avahi/services/instrument.service",
containing the following:
+------------------------------------------------------------------------------------------------
| <?xml version="1.0" encoding="utf-8"?>
| <!DOCTYPE service-group SYSTEM "avahi-service.dtd">
| <service-group>
| <name replace-wildcards="yes">%h</name>
| <service>
| <type>_abi-instrument._tcp</type>
| <port>7000</port>
| <txt-record>status=Sleeping</txt-record>
| <txt-record>protocol=</txt-record>
| <txt-record>experiment=</txt-record>
| <txt-record>serialnumber=932006666</txt-record>
| <txt-record>product=SeqStudio</txt-record>
| <txt-record>runid=</txt-record>
| <txt-record>version=1.1.dev</txt-record>
| <txt-record>release=1.1.b2</txt-record>
| <txt-record>build=</txt-record>
| <txt-record>injection=</txt-record>
| <txt-record>description=Applied Biosystems(tm) SeqStudio(tm) Genetic
Analyzer</txt-record>
| </service>
| </service-group>
+------------------------------------------------------------------------------------------------
With this file in place, "avahi-daemon" encounters a segfault starting up:
> startbit:~# avahi-daemon --debug
> Process 20682 died: No such process; trying to remove PID file.
(/run/avahi-daemon//pid)
> Found user 'avahi' (UID 113) and group 'avahi' (GID 118).
> Successfully dropped root privileges.
> avahi-daemon 0.7 starting up.
> chroot.c: chroot() helper started
> Successfully called chroot().
> Successfully dropped remaining capabilities.
> chroot.c: chroot() helper got command 02
> Loading service file /services/instrument.service.
> chroot.c: chroot() helper exiting with return value 0
> Segmentation fault
However if I remove those "<txt-record>" entries that have no value
after the "=" sign, "avahi-daemon" starts up normally (save for a
bugus warnign about duplicate mDNS stack on this host):
+------------------------------------------------------------------------------------------------
| <?xml version="1.0" encoding="utf-8"?>
| <!DOCTYPE service-group SYSTEM "avahi-service.dtd">
| <service-group>
| <name replace-wildcards="yes">%h</name>
| <service>
| <type>_abi-instrument._tcp</type>
| <port>7000</port>
| <txt-record>status=Sleeping</txt-record>
| <txt-record>protocol=</txt-record>
| <txt-record>experiment=</txt-record>
| <txt-record>serialnumber=932006666</txt-record>
| <txt-record>product=SeqStudio</txt-record>
| <txt-record>runid=</txt-record>
| <txt-record>version=1.1.dev</txt-record>
| <txt-record>release=1.1.b2</txt-record>
| <txt-record>build=</txt-record>
| <txt-record>injection=</txt-record>
| <txt-record>description=Applied Biosystems(tm) SeqStudio(tm) Genetic
Analyzer</txt-record>
| </service>
| </service-group>
+------------------------------------------------------------------------------------------------
> startbit:~# avahi-daemon --debug
> Process 20846 died: No such process; trying to remove PID file.
(/run/avahi-daemon//pid)
> Found user 'avahi' (UID 113) and group 'avahi' (GID 118).
> Successfully dropped root privileges.
> avahi-daemon 0.7 starting up.
> chroot.c: chroot() helper started
> Successfully called chroot().
> Successfully dropped remaining capabilities.
> chroot.c: chroot() helper got command 02
> Loading service file /services/instrument.service.
> Loading service file /services/ssh.service.
> *** WARNING: Detected another IPv4 mDNS stack running on this host. This
makes mDNS unreliable and is thus not recommended. ***
> *** WARNING: Detected another IPv6 mDNS stack running on this host. This
makes mDNS unreliable and is thus not recommended. ***
> Joining mDNS multicast group on interface enp4s0.IPv6 with address
fe80::a28c:fdff:fe32:8013.
> New relevant interface enp4s0.IPv6 for mDNS.
> Joining mDNS multicast group on interface enp4s0.IPv4 with address
10.43.32.19.
> New relevant interface enp4s0.IPv4 for mDNS.
> Network interface enumeration completed.
> Registering new address record for fe80::a28c:fdff:fe32:8013 on enp4s0.*.
> Registering new address record for 10.43.32.19 on enp4s0.IPv4.
> Server startup complete. Host name is startbit.local. Local service cookie
is 3029496375.
> Service "startbit" (/services/ssh.service) successfully established.
> Service "startbit" (/services/instrument.service) successfully established.
Regards,
-tor
-- System Information:
Debian Release: buster/sid
APT prefers stable-updates
APT policy: (500, 'stable-updates'), (500, 'unstable'), (500, 'stable'),
(500, 'oldstable')
Architecture: amd64 (x86_64)
Kernel: Linux 4.13.0-1-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8),
LANGUAGE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
Versions of packages avahi-daemon depends on:
ii adduser 3.116
ii bind9-host [host] 1:9.10.6+dfsg-5
ii dbus 1.12.2-1
ii init-system-helpers 1.51
ii libavahi-common3 0.7-3
ii libavahi-core7 0.7-3
ii libc6 2.25-1
ii libcap2 1:2.25-1.1
ii libdaemon0 0.14-6+b1
ii libdbus-1-3 1.12.2-1
ii libexpat1 2.2.3-2
ii lsb-base 9.20170808
Versions of packages avahi-daemon recommends:
ii libnss-mdns 0.10-8
Versions of packages avahi-daemon suggests:
pn avahi-autoipd <none>
-- Configuration Files:
/etc/default/avahi-daemon changed:
AVAHI_DAEMON_DETECT_LOCAL=0
-- no debconf information
--- End Message ---
--- Begin Message ---
Version: 0.8-1
Marking as fixed in 0.8-1.
Thanks again.
On Fri, 24 Apr 2020 12:25:32 +0100 Simon McVittie <[email protected]> wrote:
Control: tags -1 + fixed-upstream pending
On Fri, 10 May 2019 at 16:33:57 +0200, Krzesimir Nowak wrote:
> I'm the last person who changed that code, so I think I'm to blame for the
> crash. I was let know about this bug, so I wrote a fix. Please see the
> following PR on github:
>
> https://github.com/lathiat/avahi/pull/226
This looks like essentially the same bug as #947891. Your patch was
applied upstream, and there's an essentially equivalent patch queued up
in the packaging git repository already.
smcv
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--- End Message ---
