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Bug 1692696

Summary: SELinux is preventing /usr/bin/evince-thumbnailer from using the nnp_transition, nosuid_transition access on a process.
Product: Red Hat Enterprise Linux 7 Reporter: Oliver Ilian <oliver>
Component: selinux-policyAssignee: Lukas Vrabec <lvrabec>
Status: CLOSED DUPLICATE QA Contact: Milos Malik <mmalik>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 7.6CC: lvrabec, mmalik, plautrba, ssekidde, tjackson, vmojzis, zpytela
Target Milestone: rc   
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2019-08-21 08:55:12 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Oliver Ilian 2019-03-26 09:21:00 UTC 
Description of problem:
When opening a PDF or a folder with PDFs, the below selinux error pops up.

Version-Release number of selected component (if applicable):
selinux-policy-3.13.1-229.el7_6.9.noarch


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

If you believe that evince-thumbnailer should be allowed nnp_transition
nosuid_transition access on processes labeled thumb_t 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 'evince-thumbnai' --raw | audit2allow -M my-evincethumbnai
# semodule -i my-evincethumbnai.pp

Additional Information:
Source Context
unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1
                              023
Target Context
unconfined_u:unconfined_r:thumb_t:s0-s0:c0.c1023
Target Objects                Unknown [ process2 ]
Source                        evince-thumbnai
Source Path                   /usr/bin/evince-thumbnailer
Port                          <Unknown>
Host                          xxxx
Source RPM Packages           evince-3.28.2-5.el7.x86_64
Target RPM Packages
Policy RPM                    selinux-policy-3.13.1-229.el7_6.9.noarch
Selinux Enabled               True
Policy Type                   targeted
Enforcing Mode                Enforcing
Host Name                     xxxx
Platform                      Linux xxxx
                              3.10.0-957.5.1.el7.x86_64 #1 SMP Wed Dec 19
                              10:46:58 EST 2018 x86_64 x86_64
Alert Count                   2
First Seen                    2019-03-22 11:55:18 CET
Last Seen                     2019-03-26 09:49:05 CET
Local ID                      24e44864-4311-434b-9f0d-112df78f76b0

Raw Audit Messages
type=AVC msg=audit(1553590145.609:2467): avc:  denied  { nnp_transition
nosuid_transition } for  pid=8364 comm="flatpak-bwrap"
scontext=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023
tcontext=unconfined_u:unconfined_r:thumb_t:s0-s0:c0.c1023
tclass=process2 permissive=0


type=SYSCALL msg=audit(1553590145.609:2467): arch=x86_64 syscall=execve
success=yes exit=0 a0=7ffd1847402b a1=7ffd18476660 a2=13a0160
a3=7ffd18473b20 items=0 ppid=8359 pid=8364 auid=16201 uid=16201
gid=16201 euid=16201 suid=16201 fsuid=16201 egid=16201 sgid=16201
fsgid=16201 tty=(none) ses=35 comm=evince-thumbnai
exe=/usr/bin/evince-thumbnailer
subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null)

Hash:
evince-thumbnai,unconfined_t,thumb_t,process2,nnp_transition,nosuid_transition
Comment 2 Marek Kašík 2019-08-19 14:10:13 UTC 
I still don't quite understand why flatpak-bwrap is involved in creating of thumbnails and hence the domain transition is needed so I'll just reassign this to SELinux. However they rejected fix for similar issue in 7.7 (#1650248) but it looks that this is hit quite frequently on CentOS and has been fixed there (#1712603).

Similar issue has been fixed in Fedora 27 by creating of new interface thumb_nnp_domtrans allowing domain transition with NoNewPrivs. This interface has been added to thumb_run()(#1509502). Maybe we just need to add evince there too.

I can reproduce this instantly by just visiting a directory with some PDFs in nautilus (which doesn't have cached thumbnails).
Comment 3 Zdenek Pytela 2019-08-21 08:55:12 UTC 

*** This bug has been marked as a duplicate of bug 1712603 ***