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[Bug network/19791] res_query.c:262 asserts when dns contains unreachable entries
- From: "fweimer at redhat dot com" <sourceware-bugzilla at sourceware dot org>
- To: glibc-bugs at sourceware dot org
- Date: Thu, 10 Mar 2016 22:13:43 +0000
- Subject: [Bug network/19791] res_query.c:262 asserts when dns contains unreachable entries
- Auto-submitted: auto-generated
- References: <bug-19791-131 at http dot sourceware dot org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=19791
--- Comment #9 from Florian Weimer <fweimer at redhat dot com> ---
Thanks. I can reproduce it now. I was running the test against the name
server from the reproducer, not a real-world nameserver. I have not found the
root cause yet, though.
From what I can tell, the resolver is pretty much unusable in this
configuration (IPv6 addresses disabled, IPv6 name server configured).
Supposedly successful DNS lookups do not return any data, and NXDOMAIN/NODATA
responses result in the reported assertion failure. Does this match what you
see?
I assume you discovered this right after applying the patch because everything
stopped working. Or was the failure more subtle?
(I'm asking these questions to determine if this constitutes a security bug in
its own right, rather than a regression exposed by a security fix.)
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