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<p class="MsoNormal"><span style="color:#1F497D">Hello.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">We are running Kamailio 4.3.5 on Ubuntu 14.04 LTS 64-bit.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Sorry, I should have included that information in my first email.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I have done more debugging, and I believe the problem is caused by the</span>
<span style="color:#1F497D">subst_run() function being used on a message buffer which is not null terminated at msg->len.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">The subst_f() and subst_body_f() functions both call subst_run(), and most of the time, everything seems fine. However, in our use case, the msg->buf does not always seem to be null terminated at msg->len.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">In other words: msg->buf[msg->len] != '\0'<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">It seems there is sometimes some extra data in the buffer beyond msg->len, and subst_run() may abort() if it ever moves beyond msg->len.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I found a few places in textops.c where a buffer is being temporarily null terminated in order to perform a regexec () search, then restored later, as in:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">body = hf->body;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">c = body.s[body.len];<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">body.s[body.len] = '\0';<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">ret = regexec((regex_t*) re, body.s, 1, &pmatch, 0);<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">body.s[body.len] = c;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I've tried making the same type of change to subst_f() and subst_body_f(), and now I am not seeing the crash.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">If I guarantee that msg->buf[msg->len] == '\0' when subst_run() is called, then everything seems to be OK.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">What do you think? Is that a valid change to make?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Let me know if you'd like me to make a pull request on the main branch with those changes.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Thanks very much.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"> -Cody<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="color:windowtext">From:</span></b><span style="color:windowtext"> Daniel-Constantin Mierla [mailto:miconda@gmail.com]
<br>
<b>Sent:</b> Sunday, July 30, 2017 11:12 PM<br>
<b>To:</b> Kamailio (SER) - Users Mailing List <sr-users@lists.kamailio.org>; Cody Herzog <CHerzog@IntouchHealth.com><br>
<b>Subject:</b> Re: [SR-Users] Core crash in del_lump() "offset exceeds message size" when using subst() inside tm:local-request route.<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p>Hello,<span style="font-size:12.0pt"><o:p></o:p></span></p>
<p>what's the version of Kamailio and the operating system you run on?<o:p></o:p></p>
<p>Cheers,<br>
Daniel<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">On 28.07.17 23:53, Cody Herzog wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal">Hello.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Inside the tm:local-request route, I am trying to modify the body of outgoing NOTIFY messages using the subst_body() function.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Things seem to work fine most of the time. The NOTIFY messages are correctly modified. However, I will very rarely hit a crash.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I can force the crash to happen more quickly by stress testing with thousands of NOTIFY messages being modified.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Is it safe to call subst() or subst_body() inside the tm:local-request route? If not, is there another way I can modify the outgoing NOTIFY messages safely?<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Note that I am also calling append_hf() inside the same tm:local-request route, but that has been working for a very long time without causing any problems. Could there be some kind of bad interaction between append_hf() and subst_body()?<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Strangely, it seems like using subst() makes the crash more likely to happen. For some reason, subst_body() seems to be more robust.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Here are the logs I see:<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">---------<o:p></o:p></p>
<p class="MsoNormal">Jul 28 10:57:40 SIPCOMM-VEGAS-TEST /usr/local/sbin/kamailio[2476]: CRITICAL: <core> [data_lump.c:292]: del_lump(): offset exceeds message size (1625 > 1194) aborting...<o:p></o:p></p>
<p class="MsoNormal">Jul 28 10:57:43 SIPCOMM-VEGAS-TEST /usr/local/sbin/kamailio[2481]: CRITICAL: <core> [pass_fd.c:275]: receive_fd(): EOF on 53<o:p></o:p></p>
<p class="MsoNormal">Jul 28 10:57:44 SIPCOMM-VEGAS-TEST /usr/local/sbin/kamailio[2367]: ALERT: <core> [main.c:731]: handle_sigs(): child process 2476 exited by a signal 6<o:p></o:p></p>
<p class="MsoNormal">Jul 28 10:57:44 SIPCOMM-VEGAS-TEST /usr/local/sbin/kamailio[2367]: ALERT: <core> [main.c:734]: handle_sigs(): core was generated<o:p></o:p></p>
<p class="MsoNormal">Jul 28 10:57:44 SIPCOMM-VEGAS-TEST /usr/local/sbin/kamailio[2367]: INFO: <core> [main.c:756]: handle_sigs(): terminating due to SIGCHLD<o:p></o:p></p>
<p class="MsoNormal">---------<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Here is a GDB back trace from the core dump:<o:p></o:p></p>
<p class="MsoNormal">---------<o:p></o:p></p>
<p class="MsoNormal">#0 0x00007fd91a567c37 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56<o:p></o:p></p>
<p class="MsoNormal">#1 0x00007fd91a56b028 in __GI_abort () at abort.c:89<o:p></o:p></p>
<p class="MsoNormal">#2 0x000000000044e981 in del_lump (msg=0x7fd917c5ed60 <lreq>, offset=1625, len=20, type=HDR_OTHER_T) at data_lump.c:293<o:p></o:p></p>
<p class="MsoNormal">#3 0x00007fd91676297f in subst_f (msg=0x7fd917c5ed60 <lreq>, subst=0x7fd919e5ccc0 "\320\356\345\031\331\177", ignored=0x0) at textops.c:681<o:p></o:p></p>
<p class="MsoNormal">#4 0x000000000041e1dd in do_action (h=0x7ffd364b87c0, a=0x7fd919e9b438, msg=0x7fd917c5ed60 <lreq>) at action.c:1059<o:p></o:p></p>
<p class="MsoNormal">#5 0x000000000042a917 in run_actions (h=0x7ffd364b87c0, a=0x7fd919e9b438, msg=0x7fd917c5ed60 <lreq>) at action.c:1548<o:p></o:p></p>
<p class="MsoNormal">#6 0x000000000042af94 in run_actions_safe (h=0x7ffd364ba5b0, a=0x7fd919e9b438, msg=0x7fd917c5ed60 <lreq>) at action.c:1613<o:p></o:p></p>
<p class="MsoNormal">#7 0x0000000000549972 in rval_get_int (h=0x7ffd364ba5b0, msg=0x7fd917c5ed60 <lreq>, i=0x7ffd364b8b58, rv=0x7fd919e9ced8, cache=0x0) at rvalue.c:912<o:p></o:p></p>
<p class="MsoNormal">#8 0x000000000054dc7c in rval_expr_eval_int (h=0x7ffd364ba5b0, msg=0x7fd917c5ed60 <lreq>, res=0x7ffd364b8b58, rve=0x7fd919e9ced0) at rvalue.c:1910<o:p></o:p></p>
<p class="MsoNormal">#9 0x000000000041dc52 in do_action (h=0x7ffd364ba5b0, a=0x7fd919e9d990, msg=0x7fd917c5ed60 <lreq>) at action.c:1029<o:p></o:p></p>
<p class="MsoNormal">#10 0x000000000042a917 in run_actions (h=0x7ffd364ba5b0, a=0x7fd919e9d990, msg=0x7fd917c5ed60 <lreq>) at action.c:1548<o:p></o:p></p>
<p class="MsoNormal">#11 0x000000000041e0c4 in do_action (h=0x7ffd364ba5b0, a=0x7fd919e9dad8, msg=0x7fd917c5ed60 <lreq>) at action.c:1044<o:p></o:p></p>
<p class="MsoNormal">#12 0x000000000042a917 in run_actions (h=0x7ffd364ba5b0, a=0x7fd919e973b8, msg=0x7fd917c5ed60 <lreq>) at action.c:1548<o:p></o:p></p>
<p class="MsoNormal">#13 0x000000000041ab46 in do_action (h=0x7ffd364ba5b0, a=0x7fd919e95d70, msg=0x7fd917c5ed60 <lreq>) at action.c:677<o:p></o:p></p>
<p class="MsoNormal">#14 0x000000000042a917 in run_actions (h=0x7ffd364ba5b0, a=0x7fd919e8f330, msg=0x7fd917c5ed60 <lreq>) at action.c:1548<o:p></o:p></p>
<p class="MsoNormal">#15 0x000000000041e0c4 in do_action (h=0x7ffd364ba5b0, a=0x7fd919e95eb8, msg=0x7fd917c5ed60 <lreq>) at action.c:1044<o:p></o:p></p>
<p class="MsoNormal">#16 0x000000000042a917 in run_actions (h=0x7ffd364ba5b0, a=0x7fd919e8c8e0, msg=0x7fd917c5ed60 <lreq>) at action.c:1548<o:p></o:p></p>
<p class="MsoNormal">#17 0x000000000042b07d in run_top_route (a=0x7fd919e8c8e0, msg=0x7fd917c5ed60 <lreq>, c=0x0) at action.c:1634<o:p></o:p></p>
<p class="MsoNormal">#18 0x00007fd917a0539a in t_uac_prepare (uac_r=0x7ffd364baf20, dst_req=0x7ffd364ba8f0, dst_cell=0x7ffd364ba8f8) at uac.c:391<o:p></o:p></p>
<p class="MsoNormal">#19 0x00007fd917a07945 in t_uac_with_ids (uac_r=0x7ffd364baf20, ret_index=0x0, ret_label=0x0) at uac.c:599<o:p></o:p></p>
<p class="MsoNormal">#20 0x00007fd917a07918 in t_uac (uac_r=0x7ffd364baf20) at uac.c:584<o:p></o:p></p>
<p class="MsoNormal">#21 0x00007fd917a09b9e in req_within (uac_r=0x7ffd364baf20) at uac.c:802<o:p></o:p></p>
<p class="MsoNormal">#22 0x00007fd914674052 in send_notify_request (subs=0x7ffd364bb200, watcher_subs=0x0, n_body=0x0, force_null_body=0) at notify.c:1600<o:p></o:p></p>
<p class="MsoNormal">#23 0x00007fd9146754b3 in notify (subs=0x7ffd364bb200, watcher_subs=0x0, n_body=0x0, force_null_body=0) at notify.c:1690<o:p></o:p></p>
<p class="MsoNormal">#24 0x00007fd9146cec6a in update_subscription (msg=0x7fd919efeb70, subs=0x7ffd364bb200, to_tag_gen=1, sent_reply=0x7ffd364bb16c) at subscribe.c:697<o:p></o:p></p>
<p class="MsoNormal">#25 0x00007fd9146d45b7 in handle_subscribe (msg=0x7fd919efeb70, watcher_user=..., watcher_domain=...) at subscribe.c:1057<o:p></o:p></p>
<p class="MsoNormal">#26 0x00007fd9146d08b0 in handle_subscribe0 (msg=0x7fd919efeb70) at subscribe.c:816<o:p></o:p></p>
<p class="MsoNormal">#27 0x000000000041e155 in do_action (h=0x7ffd364bd680, a=0x7fd919e19508, msg=0x7fd919efeb70) at action.c:1053<o:p></o:p></p>
<p class="MsoNormal">#28 0x000000000042a917 in run_actions (h=0x7ffd364bd680, a=0x7fd919e19508, msg=0x7fd919efeb70) at action.c:1548<o:p></o:p></p>
<p class="MsoNormal">#29 0x000000000041e112 in do_action (h=0x7ffd364bd680, a=0x7fd919e19650, msg=0x7fd919efeb70) at action.c:1048<o:p></o:p></p>
<p class="MsoNormal">#30 0x000000000042a917 in run_actions (h=0x7ffd364bd680, a=0x7fd919e02638, msg=0x7fd919efeb70) at action.c:1548<o:p></o:p></p>
<p class="MsoNormal">#31 0x000000000041e0c4 in do_action (h=0x7ffd364bd680, a=0x7fd919e199c0, msg=0x7fd919efeb70) at action.c:1044<o:p></o:p></p>
<p class="MsoNormal">#32 0x000000000042a917 in run_actions (h=0x7ffd364bd680, a=0x7fd919e199c0, msg=0x7fd919efeb70) at action.c:1548<o:p></o:p></p>
<p class="MsoNormal">#33 0x000000000041e112 in do_action (h=0x7ffd364bd680, a=0x7fd919e19b08, msg=0x7fd919efeb70) at action.c:1048<o:p></o:p></p>
<p class="MsoNormal">#34 0x000000000042a917 in run_actions (h=0x7ffd364bd680, a=0x7fd919df99d8, msg=0x7fd919efeb70) at action.c:1548<o:p></o:p></p>
<p class="MsoNormal">#35 0x000000000041ab46 in do_action (h=0x7ffd364bd680, a=0x7fd919dbe960, msg=0x7fd919efeb70) at action.c:677<o:p></o:p></p>
<p class="MsoNormal">#36 0x000000000042a917 in run_actions (h=0x7ffd364bd680, a=0x7fd919daedf8, msg=0x7fd919efeb70) at action.c:1548<o:p></o:p></p>
<p class="MsoNormal">#37 0x000000000042b07d in run_top_route (a=0x7fd919daedf8, msg=0x7fd919efeb70, c=0x0) at action.c:1634<o:p></o:p></p>
<p class="MsoNormal">#38 0x000000000050f678 in receive_msg (buf=0x7fd8f2c6ce28 "SUBSCRIBE
<a href="sip:endpoint-1720@intouchstaging.com">sip:endpoint-1720@intouchstaging.com</a> SIP/2.0\r\nRecord-Route:
<a href="sip:64.64.203.109:443;transport=tls;lr=on"><sip:64.64.203.109:443;transport=tls;lr=on></a>\r\nAccept: application/dialog-info+xml, application/pidf+xml, application/pidf-diff+xml,"..., len=1284, rcv_info=0x7fd8f2c6cb50) at receive.c:196<o:p></o:p></p>
<p class="MsoNormal">#39 0x00000000005fb99e in receive_tcp_msg (tcpbuf=0x7fd8f2c6ce28 "SUBSCRIBE
<a href="sip:endpoint-1720@intouchstaging.com">sip:endpoint-1720@intouchstaging.com</a> SIP/2.0\r\nRecord-Route:
<a href="sip:64.64.203.109:443;transport=tls;lr=on"><sip:64.64.203.109:443;transport=tls;lr=on></a>\r\nAccept: application/dialog-info+xml, application/pidf+xml, application/pidf-diff+xml,"..., len=1284, rcv_info=0x7fd8f2c6cb50, con=0x7fd8f2c6cb38) at tcp_read.c:1207<o:p></o:p></p>
<p class="MsoNormal">#40 0x00000000005fd48c in tcp_read_req (con=0x7fd8f2c6cb38, bytes_read=0x7ffd364bdb7c, read_flags=0x7ffd364bdb84) at tcp_read.c:1411<o:p></o:p></p>
<p class="MsoNormal">#41 0x0000000000600aee in handle_io (fm=0x7fd919f07d80, events=1, idx=-1) at tcp_read.c:1643<o:p></o:p></p>
<p class="MsoNormal">#42 0x00000000005f3ab8 in io_wait_loop_epoll (h=0xa3d3e0 <io_w>, t=2, repeat=0) at io_wait.h:1061<o:p></o:p></p>
<p class="MsoNormal">#43 0x0000000000601cf7 in tcp_receive_loop (unix_sock=57) at tcp_read.c:1755<o:p></o:p></p>
<p class="MsoNormal">#44 0x00000000005ea235 in tcp_init_children () at tcp_main.c:4788<o:p></o:p></p>
<p class="MsoNormal">#45 0x00000000004ab048 in main_loop () at main.c:1675<o:p></o:p></p>
<p class="MsoNormal">#46 0x00000000004b10c2 in main (argc=13, argv=0x7ffd364be258) at main.c:2566<o:p></o:p></p>
<p class="MsoNormal">---------<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Thanks very much.<o:p></o:p></p>
<p class="MsoNormal"> -Cody<o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><br>
<br>
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<pre>_______________________________________________<o:p></o:p></pre>
<pre>Kamailio (SER) - Users Mailing List<o:p></o:p></pre>
<pre><a href="mailto:sr-users@lists.kamailio.org">sr-users@lists.kamailio.org</a><o:p></o:p></pre>
<pre><a href="https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users">https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users</a><o:p></o:p></pre>
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<pre>-- <o:p></o:p></pre>
<pre>Daniel-Constantin Mierla<o:p></o:p></pre>
<pre><a href="http://www.twitter.com/miconda">www.twitter.com/miconda</a> -- <a href="http://www.linkedin.com/in/miconda">www.linkedin.com/in/miconda</a><o:p></o:p></pre>
<pre>Kamailio Advanced Training - <a href="http://www.asipto.com">www.asipto.com</a><o:p></o:p></pre>
<pre>Kamailio World Conference - <a href="http://www.kamailioworld.com">www.kamailioworld.com</a><o:p></o:p></pre>
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