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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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Control: tag -1 confirmed

Axel Beckert <abe@debian.org> writes:

> 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:

I can duplicate this. I made a few (unsuccessful) attempts at localize
the error.

Attempt #1

If I run /usr/lib/sendmail -bs directly (or nullmailer-smtpd, which
amounts to the same thing, I think), and give exactly the same input, it
exits cleanly when I type QUIT.  I also tried your swaks command on a
host where sendmail is postfix, and I see end of the transaction

    -> .
    <-  250 2.0.0 Ok: queued as 5EC225FB72
     -> QUIT
    <-  221 2.0.0 Bye
    === Connection closed with child process.

Attempt #2

swaks -t bremner@debian.org --pipe 'gdb -batch -ex run -ex bt --args /usr/lib/sendmail -bs'

This actually runs without segfaulting, which made me think it might be
a memory error.

Attempt #3

swaks -t bremner@debian.org --pipe 'valgrind /usr/lib/sendmail -bs'

This also runs without errors, so I'm out of ideas for the moment.

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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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