Bug 1752133 - glibc: Do not fail name resolution if CNAMEs involve aliases which are not host names
Summary: glibc: Do not fail name resolution if CNAMEs involve aliases which are not ho...
Keywords:
Status: CLOSED WONTFIX
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: glibc
Version: 8.4
Hardware: All
OS: Linux
medium
medium
Target Milestone: rc
: 8.0
Assignee: Florian Weimer
QA Contact: Martin Coufal
URL:
Whiteboard:
Depends On: 1297099
Blocks: 1203710
TreeView+ depends on / blocked
 
Reported: 2019-09-13 19:54 UTC by Rupesh Patel
Modified: 2023-07-18 14:30 UTC (History)
15 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Cause: The glibc DNS stub resolver treats CNAME records with owner names that are not host names as DNS packet errors. Consequence: If the DNS stub resolver encounters such a bogus CNAME record, the DNS query is treated as failed, even though there are useful address records among the response. Fix: The glibc stub resolver now skips such invalid CNAME records, not extracting the associated alias information. Result: DNS lookups now succeed even if the server response includes a CNAME chain that contains a domain name that is not a host name.
Clone Of: 1297099
Environment:
Last Closed: 2022-09-22 13:28:05 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Bugzilla 2129005 0 unspecified CLOSED glibc: Do not fail name resolution if CNAMEs involve aliases which are not host names [rhel-9.2.0] 2023-06-27 06:24:49 UTC
Red Hat Knowledge Base (Solution) 2116941 0 None None None 2019-09-13 19:57:40 UTC
Sourceware 12154 0 P2 RESOLVED Cannot resolve hosts which have wildcard aliases 2022-09-21 19:01:12 UTC

Internal Links: 2129005

Comment 3 Florian Weimer 2022-08-10 09:36:00 UTC 
Upstream patches posted:

[PATCH 00/13] nss_dns: Fix handling of non-host CNAMEs (bug 12154)
https://sourceware.org/pipermail/libc-alpha/2022-August/141338.html
Comment 4 Florian Weimer 2022-08-30 08:21:27 UTC 
Upstream patches have been committed.
Comment 7 Carlos O'Donell 2022-09-22 13:28:05 UTC 
The Red Hat Enterprise Linux Platform Tools team has reviewed this bug with support from our Customer Experience & Engagement team and we have decided that this change is going to be too invasive for the current interfaces as they are implemented in RHEL8.

We will be reviewing fixing this for RHEL9 as part of https://bugzilla.redhat.com/show_bug.cgi?id=2129005.
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