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Bug 1971228 - SELinux is preventing /usr/sbin/unix_chkpwd from getattr access on the filesystem /proc
Summary: SELinux is preventing /usr/sbin/unix_chkpwd from getattr access on the filesy...
Keywords:
Status: CLOSED DUPLICATE of bug 1967125
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: selinux-policy
Version: 8.0
Hardware: x86_64
OS: Linux
medium
medium
Target Milestone: beta
: 8.5
Assignee: Zdenek Pytela
QA Contact: Milos Malik
URL:
Whiteboard:
Depends On:
Blocks: 1969483
TreeView+ depends on / blocked
 
Reported: 2021-06-13 04:03 UTC by Jimmie Mayfield
Modified: 2021-10-07 18:54 UTC (History)
7 users (show)

Fixed In Version:
Doc Type: No Doc Update
Doc Text:
Clone Of:
Environment:
Last Closed: 2021-06-16 16:47:40 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description Jimmie Mayfield 2021-06-13 04:03:10 UTC 
Description of problem:
On CentOS 8 Stream, SELinux 'unix_chkpwd' triggers an SELinux violation

sealert -l f26706db-2c08-4ee4-b0cf-be5534e68597
SELinux is preventing /usr/sbin/unix_chkpwd from getattr access on the filesystem /proc.
...
Raw Audit Messages
type=AVC msg=audit(1623556801.295:290): avc:  denied  { getattr } for  pid=10311 comm="unix_chkpwd" name="/" dev="proc" ino=1 scontext=system_u:system_r:chkpwd_t:s0-s0:c0.c1023 tcontext=system_u:object_r:proc_t:s0 tclass=filesystem permissive=0
...
type=SYSCALL msg=audit(1623556801.295:290): arch=x86_64 syscall=fstatfs success=no exit=EACCES a0=3 a1=7fff617eba70 a2=0 a3=0 items=0 ppid=10301 pid=10311 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm=unix_chkpwd exe=/usr/sbin/unix_chkpwd subj=system_u:system_r:chkpwd_t:s0-s0:c0.c1023 key=(null)



Version-Release number of selected component (if applicable):
OS: CentOS 8 Stream with the most recent updates
pam-1.3.1-15.el8.x86_64
selinux-policy-3.14.3-68.el8.noarch

As far as SELinux policies and PAM configuration are concerned, this machine appears to be using the package default configurations.  No local customizations have been made to SELinux or PAM config.

How reproducible:
This occurs every time someone logs into the machine


Steps to Reproduce:
1. Log into the machine 
2.
3.

Actual results:
Successful login is accompanied by a series of messages written to the journal indicating unix_chkpwd has triggered an SELinux action

Expected results:
Near as I can tell, this machine has no customized local policies and is using the default PAM config files.  I would expect a default installation to not trigger SELinux actions.

Additional info:
Comment 1 Steven Rosenberg 2021-06-13 22:26:11 UTC 
I can confirm this issue in CentOS Stream 8.
Comment 2 Zdenek Pytela 2021-06-14 08:14:01 UTC 
This commit needs to be backported:
commit 0b26432144f0b6f2140b974b9c508d991286bfa4
Author: Zdenek Pytela <zpytela>
Date:   Mon Jan 4 19:50:49 2021 +0100

    Allow domain stat /proc filesystem

    Resolves: rhbz#1892401
Comment 3 Phil Baker 2021-06-14 09:03:44 UTC 
I also can confirm this issue on my installation of CentOS Stream 8.
Comment 4 Milos Malik 2021-06-16 16:33:36 UTC 
I believe this bug is a duplicate of BZ#1967125.
Comment 5 Milos Malik 2021-06-16 16:36:48 UTC 
What version of libcap-ng package is installed on the machine?

# rpm -qa libcap\*

Thank you.
Comment 6 Jimmie Mayfield 2021-06-16 16:38:46 UTC 
> rpm -qa libpcap\*
libpcap-1.9.1-5.el8.x86_64
Comment 7 Zdenek Pytela 2021-06-16 16:47:40 UTC 
Thank you for the confirmation, resolution for this bz should be a part of RHEL 8.5, it is a (non-obvious) dup of bz#1967125.

*** This bug has been marked as a duplicate of bug 1967125 ***
Comment 8 Phil Baker 2021-06-16 18:50:20 UTC 
On my fully-patched CentOS Stream 8 virtual machine: 

rpm -qa libcap\*

libcap-ng-0.7.11-1.el8.x86_64
libcap-2.26-4.el8.x86_64
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