[Dnsmasq-discuss] Segfault with DNSSEC

[simon at simongoodall.co.uk]

On Fri, Mar 21, 2014 at 11:16:42AM +0000, Simon Kelley wrote:
> On 20/03/14 22:25, simon at simongoodall.co.uk wrote:
> > Hi,
> > 
> > I'm getting a segfault running dnsmasq with dnssec enabled.
> > 
> > Logs show the following;
> > 
> > dnsmasq[10172]: query[AAAA] www.ncbi.nlm.nih.gov from 192.168.1.4
> > dnsmasq[10172]: forwarded www.ncbi.nlm.nih.gov to 8.8.8.8
> > dnsmasq[10172]: forwarded www.ncbi.nlm.nih.gov to 8.8.8.4
> > dnsmasq[10172]: forwarded www.ncbi.nlm.nih.gov to 2001:4860:4860::8888
> > dnsmasq[10172]: forwarded www.ncbi.nlm.nih.gov to 2001:4860:4860::8844
> > dnsmasq[10172]: dnssec-query[DNSKEY] ncbi.nlm.nih.gov to 8.8.8.8
> > dnsmasq[10172]: query[A] www.ncbi.nlm.nih.gov from 192.168.1.4
> > dnsmasq[10172]: forwarded www.ncbi.nlm.nih.gov to 8.8.8.8
> > dnsmasq[10172]: query[AAAA] www.ncbi.nlm.nih.gov from 192.168.1.4
> > dnsmasq[10172]: dnssec retry to 0.0.0.0
> > 
> > and running in gdb yields;
> > 
> > #0  0x00024e44 in forward_query (udpfd=8, udpaddr=0xbefff7c0, dst_addr=0xbefff7ac, 
> >     dst_iface=2, header=0x71de8, plen=45, now=1395350397, forward=0x84430, ad_reqd=0, 
> >     do_bit=0) at forward.c:294
> > #1  0x0002790c in receive_query (listen=0x74768, now=1395350397) at forward.c:1280
> > #2  0x000313a0 in check_dns_listeners (set=0xbefff8b8, now=1395350397) at dnsmasq.c:1436
> > #3  0x0002fc1c in main (argc=4, argv=0xbefffcf4) at dnsmasq.c:951
> > (gdb) 
> > 
> > (gdb) print forward
> > $1 = (struct frec *) 0x84430
> > (gdb) print forward->rfd6
> > $2 = (struct randfd *) 0x0
> > (gdb) 
> > 
> > I am running version from git -  v2.69test11.9.g0c8584e  on an arch linux arm box. I am regularly seeing a segfault when browsing this site, although not for every query.
> > 
> 
> Many thanks. I've found, I think, the problem and pushed a fix for it to
> git.
> 
> http://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commit;h=2b29191e7c6dcfd262997bdaf7bc8c6d539efa87
> 
> Please could you see if that improves things?
> 

Thanks, so far so good. Will report back if I come across any further issues.

Simon

> 
> Cheers,
> 
> Simon.
> 
> 
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