[exim-dev] [Bug 2221] New: Exim randomly crashes on content …

https://bugs.exim.org/show_bug.cgi?id=2221

            Bug ID: 2221
           Summary: Exim randomly crashes on content scan
           Product: Exim
           Version: 4.90
          Hardware: x86-64
                OS: FreeBSD
            Status: NEW
          Severity: bug
          Priority: medium
         Component: Content Scanning
          Assignee: tom@???
          Reporter: max@???
                CC: exim-dev@???

Created attachment 1058
--> https://bugs.exim.org/attachment.cgi?id=1058&action=edit
mail sample one

Have some random crashes of Exim instances with signal 10 or 11 after upgrade
on 4.90 in FreeBSD. After downgrade on 4.89.1 issue gone.
According to quick analysis, it happens somewhere in this acl_check_mime
section of Exim config on some certain incoming email messages (see samples
below in attachment).

root@beta:/home/xm # uname -v
FreeBSD 11.1-RELEASE-p4 #0: Tue Nov 14 06:12:40 UTC 2017    
root@???:/usr/obj/usr/src/sys/GENERIC
root@beta:/home/xm # exim -bV
Exim version 4.90 #0 (FreeBSD 11.1) built 24-Dec-2017 00:05:17
Copyright (c) University of Cambridge, 1995 - 2017
(c) The Exim Maintainers and contributors in ACKNOWLEDGMENTS file, 2007 - 2017
Berkeley DB: Berkeley DB 5.3.28: (September  9, 2013)
Support for: crypteq iconv() IPv6 use_setclassresources PAM Perl Expand_dlfunc
TCPwrappers OpenSSL Content_Scanning DKIM DNSSEC Event I18N OCSP PRDR
Experimental_SPF Experimental_SRS Experimental_DANE Experimental_DCC
Experimental_DMARC
Lookups (built-in): lsearch wildlsearch nwildlsearch iplsearch cdb dbm dbmjz
dbmnz dnsdb dsearch mysql passwd sqlite
Authenticators: cram_md5 dovecot plaintext spa
Routers: accept dnslookup ipliteral manualroute queryprogram redirect
Transports: appendfile/maildir/mailstore/mbx autoreply lmtp pipe smtp
Fixed never_users: 0
Configure owner: 0:0
Size of off_t: 8
Configuration file is /usr/local/etc/exim/configure
root@beta:/home/xm # grep signal /var/log/messages | tail -n1
Dec 28 13:51:55 beta kernel: pid 82496 (exim), uid 26: exited on signal 10
root@beta:/home/xm # ll /var/spool/exim/scan/
total 1
drwxr-x---  2 mailnull  mail  6 28 дек.  13:51 1eUWj5-000LSa-KM/
root@beta:/home/xm # ll /var/spool/exim/scan/1eUWj5-000LSa-KM/
total 18
-rw-r-----  1 mailnull  mail  2364 28 дек.  13:51 1eUWj5-000LSa-KM-00000
-rw-r-----  1 mailnull  mail   389 28 дек.  13:51 1eUWj5-000LSa-KM-00001
-rw-r-----  1 mailnull  mail  1160 28 дек.  13:51 1eUWj5-000LSa-KM-00002
-rw-r-----  1 mailnull  mail  4194 28 дек.  13:51 1eUWj5-000LSa-KM.eml
root@beta:/home/xm # grep 1eUWj5-000LSa-KM /var/log/maillog
Dec 28 13:51:55 beta exim[82496]: 1eUWj5-000LSa-KM DKIM:
d=candice.vikomtools.ru s=default c=relaxed/relaxed a=rsa-sha256 b=1024
[verification failed - signature did not verify (headers probably modified in
transit)]
Dec 28 13:51:55 beta exim[82496]: 1eUWj5-000LSa-KM DMARC results:
spf_domain=candice.vikomtools.ru dmarc_domain=candice.vikomtools.ru
spf_align=yes dkim_align=no enforcement='Accept'
root@beta:/home/xm # grep 1eUWj5-000LSa-KM /var/log/clamav/clamd.log
Thu Dec 28 13:51:55 2017 ->
/var/spool/exim/scan/1eUWj5-000LSa-KM/1eUWj5-000LSa-KM.eml: OK

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