Bug 1777936 - start of the uuidd service triggers SELinux denials
Summary: start of the uuidd service triggers SELinux denials
Alias: None
Product: Fedora
Classification: Fedora
Component: selinux-policy
Version: 31
Hardware: All
OS: Linux
Target Milestone: ---
Assignee: Richard Fiľo
QA Contact: Milos Malik
Depends On:
TreeView+ depends on / blocked
Reported: 2019-11-28 17:54 UTC by Milos Malik
Modified: 2020-01-21 01:38 UTC (History)
5 users (show)

Fixed In Version: selinux-policy-3.14.4-44.fc31
Doc Type: If docs needed, set a value
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Clone Of:
Last Closed: 2020-01-21 01:38:46 UTC
Type: Bug

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Description Milos Malik 2019-11-28 17:54:49 UTC
Description of problem:
 * the uuidd service runs, but it cannot transition into the correct domain (uuidd_t)

Version-Release number of selected component (if applicable):

How reproducible:
 * always

Steps to Reproduce:
1. get a Fedora 31 machine (targeted policy is active)
2. start the uuidd service
3. search for SELinux denials

Actual results:
type=PROCTITLE msg=audit(11/28/2019 12:43:47.724:293) : proctitle=/usr/sbin/uuidd --socket-activation 
type=PATH msg=audit(11/28/2019 12:43:47.724:293) : item=1 name=/lib64/ld-linux-x86-64.so.2 inode=136860 dev=fc:01 mode=file,755 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:ld_so_t:s0 nametype=NORMAL cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0 
type=PATH msg=audit(11/28/2019 12:43:47.724:293) : item=0 name=/usr/sbin/uuidd inode=144736 dev=fc:01 mode=file,755 ouid=root ogid=root rdev=00:00 obj=system_u:object_r:uuidd_exec_t:s0 nametype=NORMAL cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0 
type=CWD msg=audit(11/28/2019 12:43:47.724:293) : cwd=/ 
type=EXECVE msg=audit(11/28/2019 12:43:47.724:293) : argc=2 a0=/usr/sbin/uuidd a1=--socket-activation 
type=SYSCALL msg=audit(11/28/2019 12:43:47.724:293) : arch=x86_64 syscall=execve success=yes exit=0 a0=0x55979be631a0 a1=0x55979bea3030 a2=0x55979be6b470 a3=0x7 items=2 ppid=1 pid=1181 auid=unset uid=uuidd gid=uuidd euid=uuidd suid=uuidd fsuid=uuidd egid=uuidd sgid=uuidd fsgid=uuidd tty=(none) ses=unset comm=uuidd exe=/usr/sbin/uuidd subj=system_u:system_r:init_t:s0 key=(null) 
type=SELINUX_ERR msg=audit(11/28/2019 12:43:47.724:293) : op=security_bounded_transition seresult=denied oldcontext=system_u:system_r:init_t:s0 newcontext=system_u:system_r:uuidd_t:s0 
type=AVC msg=audit(11/28/2019 12:43:47.724:293) : avc:  denied  { nnp_transition } for  pid=1181 comm=(uuidd) scontext=system_u:system_r:init_t:s0 tcontext=system_u:system_r:uuidd_t:s0 tclass=process2 permissive=0 

Expected results:
 * no SELinux denials
 * the uuidd service runs under uuidd_t context

Additional info:
# ps -efZ | grep uuidd
system_u:system_r:init_t:s0     uuidd       1181       1  0 12:43 ?        00:00:00 /usr/sbin/uuidd --socket-activation
unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 root 1198 939  0 12:47 pts/0 00:00:00 grep --color=auto uuidd

Comment 2 Richard Fiľo 2019-11-29 13:44:14 UTC
Link to scratch build with fix: https://copr-be.cloud.fedoraproject.org/results/rfilo/Selinux-policy-f31/fedora-31-x86_64/01120543-selinux-policy/

It should be fixed in the selinux-policy packages.

RP: https://github.com/fedora-selinux/selinux-policy-contrib/pull/173

Comment 3 Lukas Vrabec 2019-11-29 15:36:52 UTC
commit 29cc7c44b93fd2c34426dad4d410d0672c7aa014 (HEAD -> rawhide, origin/rawhide, origin/HEAD)
Author: Richard Filo <rfilo>
Date:   Fri Nov 29 14:04:54 2019 +0100

    Allow uuidd_t Domain trasition from sytemd into confined domain with NoNewPrivileges Systemd Security feature.
    Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1777936

Comment 4 Fedora Update System 2020-01-14 01:43:35 UTC
selinux-policy-3.14.4-44.fc31 has been pushed to the Fedora 31 testing repository. If problems still persist, please make note of it in this bug report.
See https://fedoraproject.org/wiki/QA:Updates_Testing for
instructions on how to install test updates.
You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2020-397eea28b7

Comment 5 Fedora Update System 2020-01-21 01:38:46 UTC
selinux-policy-3.14.4-44.fc31 has been pushed to the Fedora 31 stable repository. If problems still persist, please make note of it in this bug report.

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