asterisk/channels/sip
Matthew Jordan 1fb06fde95 Resolve crashes due to large stack allocations when using TCP
Asterisk had several places where messages received over various network
transports may be copied in a single stack allocation. In the case of TCP,
since multiple packets in a stream may be concatenated together, this can
lead to large allocations that overflow the stack.

This patch modifies those portions of Asterisk using TCP to either
favor heap allocations or use an upper bound to ensure that the stack will not
overflow:
 * For SIP, the allocation now has an upper limit
 * For HTTP, the allocation is now a heap allocation instead of a stack
   allocation
 * For XMPP (in res_jabber), the allocation has been eliminated since it was
   unnecesary.

Note that the HTTP portion of this issue was independently found by Brandon
Edwards of Exodus Intelligence.

(issue ASTERISK-20658)
Reported by: wdoekes, Brandon Edwards
Tested by: mmichelson, wdoekes
patches:
  ASTERISK-20658_res_jabber.c.patch uploaded by mmichelson (license 5049)
  issueA20658_http_postvars_use_malloc2.patch uploaded by wdoekes (license 5674)
  issueA20658_limit_sip_packet_size3.patch uploaded by wdoekes (license 5674)
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Merged revisions 378269 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 378286 from http://svn.asterisk.org/svn/asterisk/branches/10
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Merged revisions 378287 from http://svn.asterisk.org/svn/asterisk/branches/11


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@378288 65c4cc65-6c06-0410-ace0-fbb531ad65f3
2013-01-02 15:39:42 +00:00
..
include Resolve crashes due to large stack allocations when using TCP 2013-01-02 15:39:42 +00:00
config_parser.c Multiple revisions 370769-370771 2012-08-03 21:52:57 +00:00
dialplan_functions.c Multiple revisions 369001-369002 2012-06-15 16:20:16 +00:00
reqresp_parser.c Doxygen Updates - janitor work 2012-09-21 17:14:59 +00:00
sdp_crypto.c Only re-create an SRTP session when needed 2012-09-09 01:28:31 +00:00
security_events.c Clean up chan_sip 2012-07-31 19:10:41 +00:00
srtp.c Clean up doxygen warnings 2012-08-30 14:23:28 +00:00
utils.c Multiple revisions 369001-369002 2012-06-15 16:20:16 +00:00