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Bug 1979182 - avc: denied { getattr } for comm="systemctl" name="/" on systemctl start cockpit.socket
Summary: avc: denied { getattr } for comm="systemctl" name="/" on systemctl start c...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: selinux-policy
Version: 8.5
Hardware: All
OS: Linux
medium
medium
Target Milestone: beta
: 8.5
Assignee: Zdenek Pytela
QA Contact: Milos Malik
URL:
Whiteboard:
: 1983268 (view as bug list)
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-07-05 07:15 UTC by Martin Pitt
Modified: 2021-11-10 08:38 UTC (History)
5 users (show)

Fixed In Version: selinux-policy-3.14.3-76.el8
Doc Type: No Doc Update
Doc Text:
Clone Of:
Environment:
Last Closed: 2021-11-09 19:43:34 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2021:4420 0 None None None 2021-11-09 19:44:02 UTC

Description Martin Pitt 2021-07-05 07:15:48 UTC 
Description of problem: Most recent RHEL 8.5 nightlies [1] introduced a new SELinux rejection related to starting cockpit.socket.


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

cockpit-247-1.el8.x86_64
selinux-policy-3.14.3-71.el8.noarch
systemd-239-48.el8.x86_64

The image build log has a comprehensive version diff, but the only relevant ones seem to be:

    glibc (2.28-158.el8 -> 2.28-161.el8)
    kernel (4.18.0-314.el8 -> 4.18.0-318.el8)
    systemd (239-45.el8_4.1 -> 239-48.el8)

How reproducible: Always

Steps to Reproduce:
1. systemctl start cockpit.socket

I tried a few other units like rpcbind.socket, but curiously they don't seem to trigger the bug.

Actual results: SELinux violation:

    avc:  denied  { getattr } for  pid=2005 comm="systemctl" name="/" dev="vda3" ino=128 scontext=system_u:system_r:cockpit_ws_t:s0 tcontext=system_u:object_r:fs_t:s0 tclass=filesystem permissive=0


Expected results: No violation.


Additional info:

[1] https://github.com/cockpit-project/bots/pull/2156
[2] https://logs.cockpit-project.org/logs/image-refresh-2156-20210630-112020/log
Comment 1 Milos Malik 2021-07-13 10:55:35 UTC 
Following SELinux denial appears in enforcing mode:
----
type=PROCTITLE msg=audit(07/13/2021 10:48:15.711:195) : proctitle=systemctl show --property Listen cockpit.socket 
type=SYSCALL msg=audit(07/13/2021 10:48:15.711:195) : arch=x86_64 syscall=fstatfs success=no exit=EACCES(Permission denied) a0=0x3 a1=0x7fffc8eea410 a2=0x280100 a3=0x0 items=0 ppid=1920 pid=1921 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=systemctl exe=/usr/bin/systemctl subj=system_u:system_r:cockpit_ws_t:s0 key=(null) 
type=AVC msg=audit(07/13/2021 10:48:15.711:195) : avc:  denied  { getattr } for  pid=1921 comm=systemctl name=/ dev="vda2" ino=96 scontext=system_u:system_r:cockpit_ws_t:s0 tcontext=system_u:object_r:fs_t:s0 tclass=filesystem permissive=0 
----

The same SELinux denial appears in permissive mode:
----
type=PROCTITLE msg=audit(07/13/2021 12:48:49.975:894) : proctitle=systemctl show --property Listen cockpit.socket 
type=SYSCALL msg=audit(07/13/2021 12:48:49.975:894) : arch=x86_64 syscall=fstatfs success=yes exit=0 a0=0x3 a1=0x7fff5a78b180 a2=0x280100 a3=0x0 items=0 ppid=45933 pid=45934 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=systemctl exe=/usr/bin/systemctl subj=system_u:system_r:cockpit_ws_t:s0 key=(null) 
type=AVC msg=audit(07/13/2021 12:48:49.975:894) : avc:  denied  { getattr } for  pid=45934 comm=systemctl name=/ dev="vda2" ino=96 scontext=system_u:system_r:cockpit_ws_t:s0 tcontext=system_u:object_r:fs_t:s0 tclass=filesystem permissive=1 
----

# find / -xdev -inum 96
/
/boot
# df | grep vda
/dev/vda2        8901632 8259664    641968  93% /
/dev/vda1         520868  261396    259472  51% /boot
#

# rpm -qa selinux-policy\* cockpit\* | sort
cockpit-248-1.el8.x86_64
cockpit-bridge-248-1.el8.x86_64
cockpit-packagekit-248-1.el8.noarch
cockpit-storaged-248-1.el8.noarch
cockpit-system-248-1.el8.noarch
cockpit-ws-248-1.el8.x86_64
selinux-policy-3.14.3-72.el8.noarch
selinux-policy-devel-3.14.3-72.el8.noarch
selinux-policy-doc-3.14.3-72.el8.noarch
selinux-policy-minimum-3.14.3-72.el8.noarch
selinux-policy-mls-3.14.3-72.el8.noarch
selinux-policy-sandbox-3.14.3-72.el8.noarch
selinux-policy-targeted-3.14.3-72.el8.noarch
#
Comment 3 Zdenek Pytela 2021-07-30 12:06:22 UTC 
*** Bug 1983268 has been marked as a duplicate of this bug. ***
Comment 4 Phil Baker 2021-07-30 14:08:57 UTC 
selinux-policy-3.14.3-74.el8.noarch

My output of # ausearch -m avc -m user_avc -m selinux_err -i -ts today

----
type=PROCTITLE msg=audit(07/30/2021 13:59:51.174:11) : proctitle=systemctl show --property Listen cockpit.socket 
type=SYSCALL msg=audit(07/30/2021 13:59:51.174:11) : arch=x86_64 syscall=fstatfs success=no exit=EACCES(Permission denied) a0=0x3 a1=0x7ffc9b0e1c10 a2=0x280100 a3=0x0 items=0 ppid=888 pid=889 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=systemctl exe=/usr/bin/systemctl subj=system_u:system_r:cockpit_ws_t:s0 key=(null) 
type=AVC msg=audit(07/30/2021 13:59:51.174:11) : avc:  denied  { getattr } for  pid=889 comm=systemctl name=/ dev="dm-0" ino=128 scontext=system_u:system_r:cockpit_ws_t:s0 tcontext=system_u:object_r:fs_t:s0 tclass=filesystem permissive=0 
----
type=PROCTITLE msg=audit(07/30/2021 13:59:51.562:31) : proctitle=systemctl show --property Listen cockpit.socket 
type=SYSCALL msg=audit(07/30/2021 13:59:51.562:31) : arch=x86_64 syscall=fstatfs success=no exit=EACCES(Permission denied) a0=0x3 a1=0x7ffd2b79cdf0 a2=0x280100 a3=0x0 items=0 ppid=1177 pid=1180 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=systemctl exe=/usr/bin/systemctl subj=system_u:system_r:cockpit_ws_t:s0 key=(null) 
type=AVC msg=audit(07/30/2021 13:59:51.562:31) : avc:  denied  { getattr } for  pid=1180 comm=systemctl name=/ dev="dm-0" ino=128 scontext=system_u:system_r:cockpit_ws_t:s0 tcontext=system_u:object_r:fs_t:s0 tclass=filesystem permissive=0
Comment 5 Zdenek Pytela 2021-07-30 16:25:34 UTC 
I've submitted a Fedora PR to address the issue:
https://github.com/fedora-selinux/selinux-policy/pull/819
Comment 6 Zdenek Pytela 2021-08-10 15:08:31 UTC 
Commit to backport:
commit 95b6d266399a0c0484cfba33fdf24f5d0ec1759e (HEAD -> rawhide, upstream/rawhide)
Author: Zdenek Pytela <zpytela>
Date:   Fri Jul 30 18:14:34 2021 +0200

    Allow cockpit_ws_t get attributes of fs_t filesystems
Comment 17 errata-xmlrpc 2021-11-09 19:43:34 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 (selinux-policy bug fix and enhancement update), 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-2021:4420
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