BIND 9.9.1-P4 is now available

Fr34k freaknetboy at yahoo.com
Thu Oct 25 13:51:16 UTC 2012


Hello,

We are finding several of our recursive BIND 9.9.1-P3 servers (on Solaris 
10 OS) hung and I want to be able to qualify the symptoms in order to 
convince others that P4 (or 9.9.2?) will (or will not) address this.

Let me define what "hung" means in our experience:  We find that named is 
running but will not respond to queries, "rndc status" will respond with output but that output shows that named is not processing any queries 
(see below), other rndc commands appear to work as well (e.g., "rndc dumpdb").


From what I understand, P4 offers this known bug fix:

*  A deliberately constructed combination of records could cause named
   to hang while populating the additional section of a response.
   [RT #31090] -- CVE-2012-5166: Specially crafted DNS data can cause a lockup in named

Additional details are mentioned in 
https://kb.isc.org/article/AA-00801/74/CVE-2012-5166%3A-Specially-crafted-DNS-data-can-cause-a-lockup-in-named.html:  "A nameserver that has become locked-up due to the problem reported in 
this advisory will not respond to queries or control commands."

So, our hang issue qualifies for the "...will not respond to queries"; 
however, it seems that our issue does *not* qualify for the "... will 
not respond to... control commands" piece if the responses from "rndc" 
are considered control command.

Thoughts?

Thank you.


$ rndc status
version: 9.9.1-P3
(version.bind/txt/ch disabled)
CPUs found: 2
worker threads: 2
UDP listeners per interface: 2
number of zones: 36
debug level: 0
xfers running: 0
xfers deferred: 0
soa queries in progress: 0
query logging is OFF
recursive clients: 0/3900/4000
tcp clients: 0/100
server is up and running

$ time host www.google.com 127.0.0.1
;; connection timed out; no
servers could be reached
 
real    0m10.035s
user    0m0.017s
sys    
0m0.017s
$ time host localhost 127.0.0.1
;; connection timed out; no
servers could be reached
 
real    0m10.034s
user    0m0.017s
sys    
0m0.017s

$ truss -p 17657
/4:    
lwp_park(0xFE9AFD48, 0)        
(sleeping...)
/3:    
lwp_park(0x00000000, 0)         (sleeping...)
/1:    
sigtimedwait(0xFFBFFBE8, 0xFFBFFB68, 0x00000000) (sleeping...)
/2:    
lwp_park(0x00000000, 0)        
(sleeping...)
/5:    
ioctl(8, DP_POLL, 0xFE98FF80)   (sleeping...)
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