Bug 1787663 - SELinux is preventing rngd from 'read' accesses on the file /etc/passwd.
Summary: SELinux is preventing rngd from 'read' accesses on the file /etc/passwd.
Keywords:
Status: CLOSED DUPLICATE of bug 1787661
Alias: None
Product: Fedora
Classification: Fedora
Component: selinux-policy
Version: rawhide
Hardware: x86_64
OS: Unspecified
medium
medium
Target Milestone: ---
Assignee: Patrik Koncity
QA Contact: Fedora Extras Quality Assurance
URL:
Whiteboard: abrt_hash:5dd57523c11b4ac26822310ba7c...
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2020-01-03 22:11 UTC by Matt Fagnani
Modified: 2020-02-04 21:01 UTC (History)
5 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2020-01-28 08:36:38 UTC
Type: ---
Embargoed:


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Description Matt Fagnani 2020-01-03 22:11:02 UTC
Description of problem:
I ran sudo dnf upgrade --refresh in the rawhide KDE Plasma spin on 2020-1-3. The update included kernel-5.5.0-0.rc4.git1.1.fc32.x86_64, glibc-2.30.9000-28.fc32.x86_64 and other rpms. Three denials of rngd searching /var/lib/sss happened on the next boot, followed by a denial of rngd reading /etc/passwd. rngd segmentation faulted right after that. I reported the denials of rngd searching /var/lib/sss along with the journal showing the rngd denials and segmentation fault at https://bugzilla.redhat.com/show_bug.cgi?id=1787661 The denials have occurred on 4 of 4 boots since the update. 
SELinux is preventing rngd from 'read' accesses on the file /etc/passwd.

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

If you believe that rngd should be allowed read access on the passwd 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 'rngd' --raw | audit2allow -M my-rngd
# semodule -X 300 -i my-rngd.pp

Additional Information:
Source Context                system_u:system_r:rngd_t:s0
Target Context                system_u:object_r:passwd_file_t:s0
Target Objects                /etc/passwd [ file ]
Source                        rngd
Source Path                   rngd
Port                          <Unknown>
Host                          (removed)
Source RPM Packages           
Target RPM Packages           setup-2.13.6-1.fc32.noarch
Policy RPM                    selinux-policy-3.14.5-19.fc32.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     (removed)
Platform                      Linux (removed) 5.5.0-0.rc4.git1.1.fc32.x86_64 #1
                              SMP Thu Jan 2 14:27:07 UTC 2020 x86_64 x86_64
Alert Count                   4
First Seen                    2020-01-03 15:59:01 EST
Last Seen                     2020-01-03 16:44:37 EST
Local ID                      42f04cbf-a3bd-4235-b20a-dcbbeb212cc8

Raw Audit Messages
type=AVC msg=audit(1578087877.520:195): avc:  denied  { read } for  pid=906 comm="rngd" name="passwd" dev="dm-0" ino=526474 scontext=system_u:system_r:rngd_t:s0 tcontext=system_u:object_r:passwd_file_t:s0 tclass=file permissive=0


Hash: rngd,rngd_t,passwd_file_t,file,read

Version-Release number of selected component:
selinux-policy-3.14.5-19.fc32.noarch

Additional info:
component:      selinux-policy
reporter:       libreport-2.11.3
hashmarkername: setroubleshoot
kernel:         5.5.0-0.rc4.git1.1.fc32.x86_64
type:           libreport

Comment 1 Matt Fagnani 2020-01-04 06:14:30 UTC
The trace of the rngd segmentation fault indicated errors in frames #17-25 while loading /usr/lib64/opensc-pkcs11.so which is provided by opensc-0.20.0-1.fc32.x86_64. I reported the rngd segmentation fault at https://bugzilla.redhat.com/show_bug.cgi?id=1787686 opensc-0.20.0-1.fc32.x86_64 was included in the update during the boot before the rngd denials and segmentation faults started. I downgraded to opensc-0.19.0-8.fc32.x86_64 from koji. No rngd denials or segmentation fault happened on the next boot with opensc-0.19.0-8.fc32.x86_64. A change in opensc-0.20.0-1.fc32.x86_64 might be related to the rngd denials and segmentation faults. The rngd denials and segmentation faults happened on 7/7 boots with opensc-0.20.0-1.fc32.x86_64.

Comment 2 Patrik Koncity 2020-01-28 08:36:38 UTC
Fix was solved already here: https://bugzilla.redhat.com/show_bug.cgi?id=1787661

*** This bug has been marked as a duplicate of bug 1787661 ***


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