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Bug#1072922: nullmailer: "sendmail -bs" crashes: "traps: nullmailer-smtp[15059] general protection fault ip:7f0368d73dd9 sp:7fff5e3d7088 error:0 in libc.so.6[7f0368c41000+157000]"

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Package: nullmailer
Version: 1:2.2+10~g7ed88a0-5
Severity: important
Control: found -1 1:2.2-3

Dear David,

I managed to reproducibly crash nullmailer-smtpd with a "general
protection fault" by calling the following command:

  swaks -t abe@debian.org --pipe 'sendmail -bs'

This call produces the following output first:

  === Trying pipe to sendmail -bs...
  === Connected to sendmail -bs.
  <-  220 nullmailer-smtpd ready
   -> EHLO kote1.lugs.ch
  <-  250 2.3.0 OK
   -> MAIL FROM:<root@kote1.lugs.ch>
  <-  250 2.1.0 Sender accepted
   -> RCPT TO:<abe@debian.org>
  <-  250 2.1.5 Recipient accepted
   -> DATA
  <-  354 End your message with a period on a line by itself
   -> Date: Mon, 10 Jun 2024 13:21:49 +0200
   -> To: abe@debian.org
   -> From: root@kote1.lugs.ch
   -> Subject: test Mon, 10 Jun 2024 13:21:49 +0200
   -> Message-Id: <20240610132149.015058@kote1.lugs.ch>
   -> X-Mailer: swaks v20240103.0 jetmore.org/john/code/swaks/
   ->
   -> This is a test mailing
   ->
   ->
   -> .
  *** Child process closed connection unexpectedly.

In /var/log/syslog I then find these log entries:

  2024-06-10T13:21:49.468475+02:00 kote1 nullmailer: Trigger pulled.
  2024-06-10T13:21:49.468687+02:00 kote1 nullmailer: Rescanning queue.
  2024-06-10T13:21:49.468781+02:00 kote1 nullmailer: Starting delivery, 1 message(s) in queue.
  2024-06-10T13:21:49.468793+02:00 kote1 nullmailer: Starting delivery: host: … protocol: smtp file: 1718018509.15060
  2024-06-10T13:21:49.468802+02:00 kote1 nullmailer: From: <root@kote1.lugs.ch> to: <abe@debian.org>
  2024-06-10T13:21:49.468808+02:00 kote1 nullmailer: Message-Id: <20240610132149.015058@kote1.lugs.ch>
  2024-06-10T13:21:49.471688+02:00 kote1 kernel: traps: nullmailer-smtp[15059] general protection fault ip:7f0368d73dd9 sp:7fff5e3d7088 error:0 in libc.so.6[7f0368c41000+157000]
  2024-06-10T13:21:49.600127+02:00 kote1 nullmailer: smtp: Succeeded: 250 2.6.0 <20240610132149.015058@kote1.lugs.ch> [InternalId=172490181574991, Hostname=…] 1171 bytes in 0.106, 10.754 KB/sec Queued mail for delivery
  2024-06-10T13:21:49.601067+02:00 kote1 nullmailer: Sent file.
  2024-06-10T13:21:49.601118+02:00 kote1 nullmailer: Delivery complete, 0 message(s) remain.

The mail though seemed to end up in the queue. But since swaks exits
with non-zero due to "sendmail -bs" exits with non-zero, our Ansible
playbook fails, too.

I initially ran into this on a production host running Debian 11
Bullseye with different settings (hence marking as found in the version
in Bullseye), but I can still reproduce it on a test VM with Debian
Unstable where I installed nullmailer temporarily as well. (Bug report
resembles state on the latter.)

-- System Information:
Debian Release: trixie/sid
  APT prefers unstable
  APT policy: (990, 'unstable'), (600, 'testing'), (500, 'unstable-debug'), (500, 'buildd-unstable'), (110, 'experimental'), (1, 'experimental-debug'), (1, 'buildd-experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 6.8.12-amd64 (SMP w/4 CPU threads; PREEMPT)
Locale: LANG=C.UTF-8, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: sysvinit (via /sbin/init)
LSM: AppArmor: enabled

Versions of packages nullmailer depends on:
ii  debconf [debconf-2.0]  1.5.86
ii  libc6                  2.38-12.1
ii  libgnutls30t64         3.8.5-4
ii  libstdc++6             14.1.0-1

nullmailer recommends no packages.

nullmailer suggests no packages.

-- debconf information:
* shared/mailname: kote1.lugs.ch
* nullmailer/relayhost:
* nullmailer/adminaddr: abe@deuxchevaux.org
  nullmailer/defaultdomain: lugs.ch

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Bug#1072922: nullmailer: "sendmail -bs" crashes: "traps: nullmailer-smtp[15059] general protection fault ip:7f0368d73dd9 sp:7fff5e3d7088 error:0 in libc.so.6[7f0368c41000+157000]" Axel Beckert <abe@debian.org> - 2024-06-10 14:40 +0200
  Bug#1072922: nullmailer: "sendmail -bs" crashes: "traps: nullmailer-smtp[15059] general protection fault ip:7f0368d73dd9 sp:7fff5e3d7088 error:0 in libc.so.6[7f0368c41000+157000]" David Bremner <david@tethera.net> - 2024-06-11 02:10 +0200
    Bug#1072922: nullmailer: "sendmail -bs" crashes: "traps: nullmailer-smtp[15059] general protection fault ip:7f0368d73dd9 sp:7fff5e3d7088 error:0 in libc.so.6[7f0368c41000+157000]" Axel Beckert <abe@debian.org> - 2024-06-11 02:40 +0200
      Bug#1072922: nullmailer: "sendmail -bs" crashes: "traps: nullmailer-smtp[15059] general protection fault ip:7f0368d73dd9 sp:7fff5e3d7088 error:0 in libc.so.6[7f0368c41000+157000]" David Bremner <david@tethera.net> - 2024-06-11 12:50 +0200
    Bug#1072922: nullmailer: "sendmail -bs" crashes: "traps: nullmailer-smtp[15059] general protection fault ip:7f0368d73dd9 sp:7fff5e3d7088 error:0 in libc.so.6[7f0368c41000+157000]" David Bremner <david@tethera.net> - 2024-06-12 12:30 +0200
  Bug#1072922: nullmailer: "sendmail -bs" crashes: "traps: nullmailer-smtp[15059] general protection fault ip:7f0368d73dd9 sp:7fff5e3d7088 error:0 in libc.so.6[7f0368c41000+157000]" David Bremner <david@tethera.net> - 2024-06-21 21:00 +0200
  Bug#1072922: nullmailer: "sendmail -bs" crashes: "traps: nullmailer-smtp[15059] general protection fault ip:7f0368d73dd9 sp:7fff5e3d7088 error:0 in libc.so.6[7f0368c41000+157000]" David Bremner <david@tethera.net> - 2024-06-25 12:40 +0200

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