Dovecot 2.3.9 - lmtp crashes with Signal 11

Fri Dec 13 13:10:20 EET 2019

Hi Aki,

 first thanks for the quick fix.

Unfortunately, it only resolves the issue partially. For the “To: undisclosed-recipients:;”, it works now. For “To: “ it still crashes (i. e. what I did with my manual lmtp dialog).

Michael

> On 13. Dec 2019, at 11:54, Aki Tuomi <aki.tuomi at open-xchange.com> wrote:
> 
> Hi!
> 
> We have released v2.3.9.1 fixing this issue.
> 
> Thank you for your effort!
> 
> Aki
> 
> On 13.12.2019 12.27, Michael Stilkerich wrote:
>> Hallo Aki,
>> 
>>  the affected code location seems to be concerned with parsing to ’To:’ header. I checked all the mails causing the crash, the To: header is either empty (but present) or contains “undisclosed-recipients:;”.
>> 
>> I checked this manually and sure enough lmtp crashes:
>> 
>> nc -C -U dovecot-lmtp                                                                        
>> 220 keira.mike2k.de Dovecot ready.                                                                                 
>> LHLO keira.mike2k.de                                                                     
>> 250-keira.mike2k.de                                                                
>> 250-8BITMIME
>> 250-CHUNKING                                                           
>> 250-ENHANCEDSTATUSCODES                                                                                                     
>> 250-PIPELINING                  
>> 250 STARTTLS                
>> MAIL FROM:<ms at mike2k.de>    
>> 250 2.1.0 OK
>> RCPT TO:<mikey at localhost.mike2k.de>
>> 250 2.1.5 OK                
>> DATA               
>> 354 OK
>> To:
>> 
>> bla
>> 
>> .
>> 
>> 
>> (and thats it, connection closed because of the segfault).
>> 
>> Michael
>> 
>>> On 11. Dec 2019, at 08:07, Aki Tuomi <aki.tuomi at open-xchange.com> wrote:
>>> 
>>> Hi!
>>> 
>>> Can you provide a mail sample and doveconf -n please?
>>> 
>>> Aki
>>> 
>>>> On 11/12/2019 08:57 Michael Stilkerich via dovecot <dovecot at dovecot.org> wrote:
>>>> 
>>>> 
>>>> Hello,
>>>> 
>>>> since the upgrade from 2.3.8 to 2.3.9 (using the Ubuntu 18.04 packages from dovecot.org), lmtp crashes for me for some mails. Currently I have three pending mails in my postfix deferred queue since the upgrade a couple of days ago. I did not observe these issues with 2.3.8.
>>>> 
>>>> The backtrace from one of the coredumps:
>>>> 
>>>> Reading symbols from /usr/lib/dovecot/lmtp...Reading symbols from /usr/lib/debug/.build-id/f3/3a5089463b1234cbcf90bf10033d1dd5613821.debug...done.
>>>> done.
>>>> [New LWP 1554]
>>>> [Thread debugging using libthread_db enabled]
>>>> Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
>>>> Core was generated by `dovecot/lmtp'.
>>>> Program terminated with signal SIGSEGV, Segmentation fault.
>>>> #0  decode_address_header (pool=pool at entry=0x560631ad6d10, hdr=0x560631add4c8 "", address_r=address_r at entry=0x560631ad7090, name_r=name_r at entry=0x560631ad7098)
>>>>   at push-notification-event-message-common.c:20
>>>> 20      push-notification-event-message-common.c: No such file or directory.
>>>> (gdb) bt
>>>> #0  decode_address_header (pool=pool at entry=0x560631ad6d10, hdr=0x560631add4c8 "", address_r=address_r at entry=0x560631ad7090, name_r=name_r at entry=0x560631ad7098)
>>>>   at push-notification-event-message-common.c:20
>>>> #1  0x00007f3f37955fbb in decode_address_header (name_r=0x560631ad7098, address_r=0x560631ad7090, hdr=<optimized out>, pool=0x560631ad6d10) at push-notification-event-message-common.c:62
>>>> #2  push_notification_message_fill (mail=mail at entry=0x560631adc088, pool=0x560631ad6d10,
>>>>   event_flags=(PUSH_NOTIFICATION_MESSAGE_HDR_FROM | PUSH_NOTIFICATION_MESSAGE_HDR_TO | PUSH_NOTIFICATION_MESSAGE_HDR_SUBJECT | PUSH_NOTIFICATION_MESSAGE_HDR_DATE | PUSH_NOTIFICATION_MESSAGE_BODY_SNIPPE$), from=<optimized out>, to=<optimized out>, subject=<optimized out>, date=0x560631ad7050, date_tz=0x560631ad7058, message_id=0x560631ad7078, flags=0x560631ad706c, flags_set=0x560631ad7068,
>>>>   keywords=0x560631ad7070, snippet=0x560631ad7060, ext=0x560631ad7080) at push-notification-event-message-common.c:62
>>>> #3  0x00007f3f37955a41 in push_notification_event_messagenew_event (ptxn=0x560631ad6d38, ec=0x560631ad6fe0, msg=0x560631ad7010, mail=0x560631adc088) at push-notification-event-messagenew.c:83
>>>> #4  0x00007f3f379571bd in push_notification_trigger_msg_save_new (txn=0x560631ad6d38, mail=0x560631adc088, msg=0x560631ad7010) at push-notification-triggers.c:138
>>>> #5  0x00007f3f383f52f3 in notify_contexts_mail_save (mail=0x560631adc088) at notify-plugin.c:62
>>>> #6  0x00007f3f383f65b8 in notify_copy (ctx=0x560631ad7890, mail=0x560631a98b18) at notify-storage.c:104
>>>> #7  0x00007f3f3860873d in quota_copy (ctx=0x560631ad7890, mail=0x560631a98b18) at quota-storage.c:302
>>>> #8  0x00007f3f39f91e32 in mailbox_copy_int (_ctx=<optimized out>, mail=0x560631a98b18) at mail-storage.c:2759
>>>> #9  0x00007f3f3641907f in ?? () from /usr/lib/dovecot/libdovecot-sieve.so.0
>>>> #10 0x00007f3f3640e64c in ?? () from /usr/lib/dovecot/libdovecot-sieve.so.0
>>>> #11 0x00007f3f3640f11b in sieve_result_implicit_keep () from /usr/lib/dovecot/libdovecot-sieve.so.0
>>>> #12 0x00007f3f364226e1 in sieve_multiscript_finish () from /usr/lib/dovecot/libdovecot-sieve.so.0
>>>> #13 0x00007f3f3668e488 in ?? () from /usr/lib/dovecot/modules/lib90_sieve_plugin.so
>>>> #14 0x00007f3f3a2a260d in mail_do_deliver (storage_r=0x7ffedf944b40, ctx=0x7ffedf944c30) at mail-deliver.c:542
>>>> #15 mail_deliver (ctx=ctx at entry=0x7ffedf944c30, storage_r=storage_r at entry=0x7ffedf944b40) at mail-deliver.c:592
>>>> #16 0x000056063169c0e1 in lmtp_local_default_deliver (client=0x560631a5e898, lrcpt=<optimized out>, cmd=<optimized out>, trans=<optimized out>, lldctx=0x7ffedf944e70) at lmtp-local.c:593
>>>> #17 0x000056063169c8cf in lmtp_local_deliver (local=0x560631a849b0, local=0x560631a849b0, session=0x560631a9d748, src_mail=0x560631a98b18, llrcpt=0x560631a7f600, trans=0x560631a7fab8, cmd=0x560631a7f088)
>>>>   at lmtp-local.c:530
>>>> #18 lmtp_local_deliver_to_rcpts (session=0x560631a9d748, trans=0x560631a7fab8, cmd=0x560631a7f088, local=0x560631a849b0) at lmtp-local.c:654
>>>> #19 lmtp_local_data (client=client at entry=0x560631a5e898, cmd=cmd at entry=0x560631a7f088, trans=trans at entry=0x560631a7fab8, input=<optimized out>) at lmtp-local.c:730
>>>> #20 0x000056063169b0cf in client_default_cmd_data (client=0x560631a5e898, cmd=0x560631a7f088, trans=0x560631a7fab8, data_input=0x560631a83c00, data_size=<optimized out>) at lmtp-commands.c:275
>>>> #21 0x000056063169ae6f in cmd_data_finish (trans=0x560631a7fab8, cmd=0x560631a7f088, client=0x560631a5e898) at lmtp-commands.c:165
>>>> #22 cmd_data_continue (conn_ctx=0x560631a5e898, cmd=0x560631a7f088, trans=0x560631a7fab8) at lmtp-commands.c:213
>>>> #23 0x00007f3f39bfa2c7 in cmd_data_do_handle_input (cmd=0x560631a7f088) at smtp-server-cmd-data.c:285
>>>> #24 cmd_data_handle_input (cmd=0x560631a7f088) at smtp-server-cmd-data.c:333
>>>> #25 0x00007f3f39ca42af in io_loop_call_io (io=0x560631a7d8e0) at ioloop.c:718
>>>> #26 0x00007f3f39ca5c8c in io_loop_handler_run_internal (ioloop=ioloop at entry=0x560631a23fd0) at ioloop-epoll.c:222
>>>> #27 0x00007f3f39ca43c0 in io_loop_handler_run (ioloop=<optimized out>) at ioloop.c:770
>>>> #28 0x00007f3f39ca45e8 in io_loop_run (ioloop=0x560631a23fd0) at ioloop.c:743
>>>> #29 0x00007f3f39c124b3 in master_service_run (service=0x560631a23e60, callback=<optimized out>) at master-service.c:809
>>>> #30 0x0000560631699b45 in main (argc=<optimized out>, argv=<optimized out>) at main.c:169
>>>> 
>>>> I can provide one of the mails causing the crash if helpful (they are all spam).
>>>> 
>>>> Best regards,
>>>> Michael