diff options
| author | Matthew Jordan <mjordan@digium.com> | 2013-01-02 18:11:59 +0000 |
|---|---|---|
| committer | Matthew Jordan <mjordan@digium.com> | 2013-01-02 18:11:59 +0000 |
| commit | 8fb5bdce9ab9f7f3758545753cbc787653920753 (patch) | |
| tree | 65809194af8a4fa757fef26a30a2cc9c3ed02182 /main/channel.c | |
| parent | 1fb06fde957fb466388c764384c2e14698e2dc15 (diff) | |
Prevent exhaustion of system resources through exploitation of event cache
Asterisk maintains an internal cache for devices in the event subsystem. The
device state cache holds the state of each device known to Asterisk, such that
consumers of device state information can query for the last known state for
a particular device, even if it is not part of an active call. The concept of
a device in Asterisk can include entities that do not have a physical
representation. One way that this occurred was when anonymous calls are allowed
in Asterisk. A device was automatically created and stored in the cache for
each anonymous call that occurred; this was possible in the SIP and IAX2
channel drivers and through channel drivers that utilized the
res_jabber/res_xmpp resource modules (Gtalk, Jingle, and Motif). These devices
are never removed from the system, allowing anonymous calls to potentially
exhaust a system's resources.
This patch changes the event cache subsystem and device state management to
no longer cache devices that are not associated with a physical entity.
(issue ASTERISK-20175)
Reported by: Russell Bryant, Leif Madsen, Joshua Colp
Tested by: kmoore
patches:
event-cachability-3.diff uploaded by jcolp (license 5000)
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Merged revisions 378303 from http://svn.asterisk.org/svn/asterisk/branches/1.8
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Merged revisions 378320 from http://svn.asterisk.org/svn/asterisk/branches/10
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Merged revisions 378321 from http://svn.asterisk.org/svn/asterisk/branches/11
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@378322 65c4cc65-6c06-0410-ace0-fbb531ad65f3
Diffstat (limited to 'main/channel.c')
| -rw-r--r-- | main/channel.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/main/channel.c b/main/channel.c index 38d11b1c0..d1d4d095d 100644 --- a/main/channel.c +++ b/main/channel.c @@ -2482,7 +2482,7 @@ static void ast_channel_destructor(void *obj) * instance is dead, we don't know the state of all other possible * instances. */ - ast_devstate_changed_literal(AST_DEVICE_UNKNOWN, device_name); + ast_devstate_changed_literal(AST_DEVICE_UNKNOWN, (ast_test_flag(ast_channel_flags(chan), AST_FLAG_DISABLE_DEVSTATE_CACHE) ? AST_DEVSTATE_NOT_CACHABLE : AST_DEVSTATE_CACHABLE), device_name); } ast_channel_nativeformats_set(chan, ast_format_cap_destroy(ast_channel_nativeformats(chan))); @@ -7401,7 +7401,7 @@ int ast_setstate(struct ast_channel *chan, enum ast_channel_state state) /* We have to pass AST_DEVICE_UNKNOWN here because it is entirely possible that the channel driver * for this channel is using the callback method for device state. If we pass in an actual state here * we override what they are saying the state is and things go amuck. */ - ast_devstate_changed_literal(AST_DEVICE_UNKNOWN, name); + ast_devstate_changed_literal(AST_DEVICE_UNKNOWN, (ast_test_flag(ast_channel_flags(chan), AST_FLAG_DISABLE_DEVSTATE_CACHE) ? AST_DEVSTATE_NOT_CACHABLE : AST_DEVSTATE_CACHABLE), name); /* setstate used to conditionally report Newchannel; this is no more */ /*** DOCUMENTATION |