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Bug 1670043 - glibc: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid long timeouts [rhel-8]
Summary: glibc: libresolv should use IP_RECVERR/IPV6_RECVERR to avoid long timeouts [r...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: glibc
Version: 8.1
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: 8.1
Assignee: Patsy Griffin
QA Contact: qe-baseos-tools-bugs
URL:
Whiteboard:
Depends On: 1670028
Blocks: 1670041 1684559
TreeView+ depends on / blocked
 
Reported: 2019-01-28 13:34 UTC by Florian Weimer
Modified: 2023-07-18 14:30 UTC (History)
7 users (show)

Fixed In Version: glibc-2.28-63.el8
Doc Type: No Doc Update
Doc Text:
Clone Of: 1670028
Environment:
Last Closed: 2019-11-05 21:29:04 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2019:3513 0 None None None 2019-11-05 21:29:24 UTC
Sourceware 24047 0 P2 RESOLVED libresolv should use IP_RECVERR/IPV6_RECVERR to avoid long timeouts 2020-11-26 20:12:31 UTC

Description Florian Weimer 2019-01-28 13:34:04 UTC 
+++ This bug was initially created as a clone of Bug #1670028 +++

The Linux kernel does not forward certain ICMP errors to userspace unless IP_RECVERR/IPV6_RECVERR is specified.  We should use this socket option in the DNS stub resolver, as suggested in the upstream bug.
Comment 3 Florian Weimer 2019-06-04 14:31:50 UTC 
Upstream commit:

commit 08504de71813ddbd447bfbca4a325cbe8ce8bcda
Author: Florian Weimer <fweimer>
Date:   Tue Mar 12 11:40:47 2019 +0100

    resolv: Enable full ICMP errors for UDP DNS sockets [BZ #24047]
    
    The Linux kernel suppresses some ICMP error messages by default for
    UDP sockets.  This commit enables full ICMP error reporting,
    hopefully resulting in faster failover to working name servers.

Hurd-specific follow-on fix (optional):

commit 043440e761d395e1f507d9faa6e82b3fe4536c3f
Author: Florian Weimer <fweimer>
Date:   Wed Mar 13 14:58:58 2019 +0100

    hurd: Add no-op version of __res_enable_icmp [BZ #24047]
    
    Mach does not support IP_RECVERR, so replace this function with a
    stub in a sysdeps override for Hurd.
    
    This fixes commit 08504de71813ddbd447bfbca4a325cbe8ce8bcda
    ("resolv: Enable full ICMP errors for UDP DNS sockets [BZ #24047]").

For verification, I think it is sufficient to check that strace shows the additional setsockopt call.
Comment 5 Sergey Kolosov 2019-09-09 07:05:54 UTC 
Verified with strace
Comment 7 errata-xmlrpc 2019-11-05 21:29:04 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2019:3513
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