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Bug 1986782 - groupdel gives segmentation fault when using '-P'
Summary: groupdel gives segmentation fault when using '-P'
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: shadow-utils
Version: 8.4
Hardware: All
OS: Linux
high
medium
Target Milestone: beta
: ---
Assignee: Iker Pedrosa
QA Contact: Anuj Borah
URL:
Whiteboard: sync-to-jira review
Depends On:
Blocks: 2024834
TreeView+ depends on / blocked
 
Reported: 2021-07-28 10:24 UTC by Vinay Mishra
Modified: 2022-05-10 16:33 UTC (History)
5 users (show)

Fixed In Version: shadow-utils-4.6-16.el8
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
: 2024834 (view as bug list)
Environment:
Last Closed: 2022-05-10 15:20:22 UTC
Type: Bug
Target Upstream Version:
Embargoed:
pm-rhel: mirror+

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Github RedHatQE pam pull 2 0 None open Tests: Automation of two bz 2021-12-03 07:58:03 UTC
Red Hat Issue Tracker SSSD-3745 0 None None None 2021-10-06 10:16:02 UTC
Red Hat Product Errata RHBA-2022:2021 0 None None None 2022-05-10 15:20:37 UTC

Description Vinay Mishra 2021-07-28 10:24:55 UTC 
This bug was initially created as a copy of Bug #1986111

I am copying this bug because: 

Description of problem:
When using groupdel with a prefix path, it segfaults on Fedora 34.
groupadd and groupmod both are working fine.

Version-Release number of selected component (if applicable):
shadow-utils-4.6-12.el8.x86_64

How reproducible:
Every time groupdel is executed (as root)

Steps to Reproduce:
1. Create a custom /etc/group file, e.g. using
[root@rhel84-vm ~]# mkdir -p $HOME/custom_root/etc/
[root@rhel84-vm ~]# touch $HOME/custom_root/etc/group
2. Create a group (succeeds)
[root@rhel84-vm ~]# groupadd -P $HOME/custom_root test_group
3. Delete the group (fails)
[root@rhel84-vm ~]# groupdel -P $HOME/custom_root test_group

Actual results:
[root@rhel84-vm ~]# groupdel -P $HOME/custom_root test_group
Segmentation fault (core dumped)

Expected results:
Return code 0 with the group deleted from $HOME/custom_root/etc/group
Comment 1 Roy Lenferink 2021-07-28 16:42:50 UTC 
After trying some things today it seems that this is related to the existence of a 'passwd' file next to the group file. This because 'groupdel' can then check whether a group is used as primary group. After creating the passwd file (touch $HOME/custom_root/etc/passwd) the groupdel -P command succeeds.

I think there are two options here:
1. Have groupdel output some logging that the passwd file needs to exist
2. Update groupdel to not fail on the absence of a passwd file and just assume that there are no users using the group as primary group.

I'd go with option 2 here, since groupdel then doesn't require a passwd file to continue operating. In case the file doesn't exist, IMO it can be safely said that the group is also not used as primary group for any users (since there are no users).
Comment 2 Iker Pedrosa 2021-11-12 15:48:20 UTC 
@aborah can you provide qa_ack? Reproduction steps are available in comment#0
Comment 3 Iker Pedrosa 2021-11-19 08:34:28 UTC 
master
    groupdel: fix SIGSEGV when passwd does not exist - a757b458ffb4fb9a40bcbb4f7869449431c67f83
Comment 9 errata-xmlrpc 2022-05-10 15:20:22 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 (shadow-utils bug fix and enhancement update), 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/RHBA-2022:2021
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