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Bug 1676810 - Selinux prevents ModemManager when writing /sys
Summary: Selinux prevents ModemManager when writing /sys
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: selinux-policy
Version: 7.6
Hardware: All
OS: Linux
urgent
urgent
Target Milestone: rc
: 7.6
Assignee: Lukas Vrabec
QA Contact: Milos Malik
URL:
Whiteboard:
Depends On:
Blocks: 1697868
TreeView+ depends on / blocked
 
Reported: 2019-02-13 09:48 UTC by Akhil John
Modified: 2020-10-15 15:52 UTC (History)
12 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
: 1697868 (view as bug list)
Environment:
Last Closed: 2019-08-06 12:52:54 UTC
Target Upstream Version:
Embargoed:
lcervako: mirror+

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Knowledge Base (Solution) 4151511 0 None None None 2020-03-01 05:19:43 UTC
Red Hat Product Errata RHBA-2019:2127 0 None None None 2019-08-06 12:53:18 UTC

Description Akhil John 2019-02-13 09:48:50 UTC 
SELinux is preventing /usr/sbin/ModemManager from write access on the
file raw_ip.

*****  Plugin catchall (100. confidence)
suggests   **************************

If you believe that ModemManager should be allowed write access on the
raw_ip file by default.
Then you should report this as a bug.
You can generate a local policy module to allow this access.
Do
allow this access for now by executing:
# ausearch -c 'ModemManager' --raw | audit2allow -M my-ModemManager
# semodule -i my-ModemManager.pp


Additional Information:
Source Context                system_u:system_r:modemmanager_t:s0
Target Context                system_u:object_r:sysfs_t:s0
Target Objects                raw_ip [ file ]
Source                        ModemManager
Source Path                   /usr/sbin/ModemManager
Port                          <Unknown>
Host                          Ajohn.pnq.csb
Source RPM Packages           ModemManager-1.6.10-1.2.el7_6.x86_64
Target RPM Packages           
Policy RPM                    selinux-policy-3.13.1-229.el7_6.6.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Permissive
Host Name                     Ajohn.pnq.csb
Platform                      Linux Ajohn.pnq.csb
                              3.10.0-1002.el7.bz1630402.10.x86_64 #1
SMP Tue Feb
                              12 13:48:41 UTC 2019 x86_64 x86_64
Alert Count                   14
First Seen                    2019-02-12 20:17:16 IST
Last Seen                     2019-02-13 12:57:49 IST
Local ID                      b4ce7555-f3dd-47bf-99ab-6677b6073c0d

Raw Audit Messages
type=AVC msg=audit(1550042869.23:7403): avc:  denied  { write }
for  pid=3806 comm="ModemManager" name="raw_ip" dev="sysfs" ino=24577
scontext=system_u:system_r:modemmanager_t:s0
tcontext=system_u:object_r:sysfs_t:s0 tclass=file permissive=1


type=SYSCALL msg=audit(1550042869.23:7403): arch=x86_64 syscall=open
success=yes exit=EAGAIN a0=5624b89fd130 a1=241 a2=1b6 a3=24 items=0
ppid=1 pid=3806 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0
egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm=ModemManager
exe=/usr/sbin/ModemManager subj=system_u:system_r:modemmanager_t:s0
key=(null)

Hash: ModemManager,modemmanager_t,sysfs_t,file,write





this is the patch to backport:
https://github.com/fedora-selinux/selinux-policy-contrib/commit/3ffb29c57d3b9496f46cd18f6843a7078f36e1d1
Comment 2 Milos Malik 2019-03-22 16:27:16 UTC 
Based on comment#0, the SELinux denial appeared on RHEL-7.6, but the bug is reported against RHEL-8. Is the mismatch intentional?
Comment 3 Akhil John 2019-03-22 19:56:46 UTC 
Hi Milos,

That was not intentional. RHEL 8 was added by mistake.
Comment 29 errata-xmlrpc 2019-08-06 12:52:54 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/RHBA-2019:2127
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