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Bug 1252570 - glibc-2.21.90-21.fc23 segfaults in hesiod getgrouplist()
Summary: glibc-2.21.90-21.fc23 segfaults in hesiod getgrouplist()
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Fedora
Classification: Fedora
Component: glibc
Version: 23
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: ---
Assignee: Carlos O'Donell
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard:
Depends On:
Blocks: 1305132
TreeView+ depends on / blocked
 
Reported: 2015-08-11 17:54 UTC by Nalin Dahyabhai
Modified: 2016-02-17 18:48 UTC (History)
8 users (show)

Fixed In Version: glibc-2.22-8.fc23, glibc-2.22.90-35.fc24 glibc-2.22-9.fc23
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2016-02-17 14:20:37 UTC
Type: Bug
Embargoed:

Attachments (Terms of Use)
gdb "where full" results, plus a couple of variables (7.65 KB, text/plain)
2015-08-11 17:54 UTC, Nalin Dahyabhai 		no flags Details
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System ID Private Priority Status Summary Last Updated
Sourceware 19573 0 None None None 2016-02-05 14:13:21 UTC

Description Nalin Dahyabhai 2015-08-11 17:54:24 UTC 
Created attachment 1061638 [details]
gdb "where full" results, plus a couple of variables

Description of problem:
With a working hesiod configuration, and hesiod enabled for group resolution, multiple applications are crashing while initializing a supplemental groups list.

Version-Release number of selected component (if applicable):
glibc-2.21.90-21.fc23.x86_64
coreutils-8.24-2.fc23.x86_64 used to reproduce the bug

How reproducible:
Always

Steps to Reproduce:
1. cat > /etc/hesiod.conf << EOF
lhs=.hs
rhs=.devel.redhat.com
EOF
2. Add "hesiod" as a source for "group" information in /etc/nsswitch.conf.  Mine reads "files hesiod".
3. Run "groups nalin" or similar.

Actual results:
"groups" segfaults.  I'll attach the gdb backtrace.

Expected results:
The expected groups list.

Additional info:
Comment 1 Florian Weimer 2016-02-05 14:13:21 UTC 
Caused by upstream commit 2212c1420c92a33b0e0bd9a34938c9814a56c0f7.  Bug reported upstream.  There are various ways to fix this, but which approach is best is unclear.
Comment 2 Florian Weimer 2016-02-15 11:24:29 UTC 
Reproducer without changing /etc:

cat > /etc/hesiod.conf << EOF
lhs=.hs
rhs=.devel.redhat.com
EOF
HESIOD_CONFIG=hesiod.conf getent -s hesiod group 0 0

I'm reverting the upstream commit which introduced this bug.
Comment 3 Fedora Update System 2016-02-16 16:08:11 UTC 
glibc-2.22-9.fc23 has been submitted as an update to Fedora 23. https://bodhi.fedoraproject.org/updates/FEDORA-2016-0f9e9a34ce
Comment 4 Fedora Update System 2016-02-17 06:26:43 UTC 
glibc-2.22-9.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-2016-0f9e9a34ce
Comment 5 Fedora Update System 2016-02-17 14:20:20 UTC 
glibc-2.22-9.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
Comment 6 Florian Weimer 2016-02-17 18:48:28 UTC 
Due to this change, a glibc update to the fixed versions *without* a reboot (or process restart) may cause name resolution failures.
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