Bug 1316972 - glibc: NULL pointer dereference in stub resolver with unconnectable name server addresses
Summary: glibc: NULL pointer dereference in stub resolver with unconnectable name serv...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Fedora
Classification: Fedora
Component: glibc
Version: 24
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: ---
Assignee: Florian Weimer
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
: 1331711 (view as bug list)
Depends On:
Blocks: 1320596 1320599 1323839
TreeView+ depends on / blocked
 
Reported: 2016-03-11 15:16 UTC by Florian Weimer
Modified: 2016-06-16 09:16 UTC (History)
11 users (show)

Fixed In Version: glibc-2.22-15.fc23, glibc-2.23.1-7.fc24
Doc Type: Bug Fix
Doc Text:
Clone Of:
: 1320596 1320599 (view as bug list)
Environment:
Last Closed: 2016-05-15 04:53:53 UTC


Attachments (Terms of Use)


Links
System ID Priority Status Summary Last Updated
Sourceware 19791 None None None 2016-03-11 15:16:32 UTC
Sourceware 19825 None None None 2016-03-23 15:22:08 UTC

Description Florian Weimer 2016-03-11 15:16:32 UTC
If /etc/resolv.conf contains addresses which cause the connect system call to fail immediately, queries which trigger search along the search path result in a segmentation fault.

A workaround is to remove the problematic addresses from /etc/resolv.conf.

Comment 1 Florian Weimer 2016-03-23 15:22:08 UTC
swbz#19825 is a very similar bug in send_vc/TCP (the original bug is about send_dg/UDP), so far only observed under valgrind.

swbz#19831 and swbz#19830 should be backported as well, to get cleaner test suite runs.

Comment 2 Florian Weimer 2016-04-29 12:05:21 UTC
*** Bug 1331711 has been marked as a duplicate of this bug. ***

Comment 3 Fedora Update System 2016-05-07 17:18:39 UTC
glibc-2.22-15.fc23 has been submitted as an update to Fedora 23. https://bodhi.fedoraproject.org/updates/FEDORA-2016-68abc0be35

Comment 4 Fedora Update System 2016-05-08 16:24:58 UTC
glibc-2.22-15.fc23 has been pushed to the Fedora 23 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2016-68abc0be35

Comment 5 Florian Weimer 2016-05-09 09:41:01 UTC
Pre-existing 2.23 backport:

commit 3a188eb4e641d2df0cfd352fd09232347f28fbe1
Author: Florian Weimer <fweimer@redhat.com>
Date:   Fri Mar 25 11:49:51 2016 +0100

    resolv: Always set *resplen2 out parameter in send_dg [BZ #19791]

New backport:

commit 075b2665b159491fdd17f5aee90d47fa7388ed6f
Author: Florian Weimer <fweimer@redhat.com>
Date:   Wed Apr 27 14:26:47 2016 +0200

    resolv: Always set *resplen2 out parameter in send_vc [BZ #19825]
    
    In various error scenarios (for example, if the server closes the
    TCP connection before sending the full response), send_vc can return
    without resetting the *resplen2 value.  This can pass uninitialized
    or unexpected data to the caller.
    
    (cherry picked from commit b9bdfa7c8fa22c944bb5f21a673dfd1f91b71c56)

Comment 6 Fedora Update System 2016-05-09 14:56:33 UTC
glibc-2.23.1-6.fc24 has been submitted as an update to Fedora 24. https://bodhi.fedoraproject.org/updates/FEDORA-2016-b321728d74

Comment 7 Fedora Update System 2016-05-10 17:57:06 UTC
glibc-2.22-15.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.

Comment 8 Fedora Update System 2016-05-10 20:30:01 UTC
glibc-2.23.1-6.fc24 has been pushed to the Fedora 24 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2016-b321728d74

Comment 9 Fedora Update System 2016-05-11 13:54:53 UTC
glibc-2.23.1-7.fc24 has been submitted as an update to Fedora 24. https://bodhi.fedoraproject.org/updates/FEDORA-2016-b321728d74

Comment 10 Fedora Update System 2016-05-12 09:43:57 UTC
glibc-2.23.1-7.fc24 has been pushed to the Fedora 24 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2016-b321728d74

Comment 11 Fedora Update System 2016-05-14 23:29:53 UTC
glibc-2.23.1-7.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.


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