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Bug 1873658 - rebased firefox produce SElinux AVC / denied sys_ptrace for rtkit-daemon
Summary: rebased firefox produce SElinux AVC / denied sys_ptrace for rtkit-daemon
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: selinux-policy
Version: 8.2
Hardware: x86_64
OS: Linux
medium
medium
Target Milestone: rc
: 8.4
Assignee: Zdenek Pytela
QA Contact: Milos Malik
URL:
Whiteboard:
: 1873695 (view as bug list)
Depends On:
Blocks: 1894575
TreeView+ depends on / blocked
 
Reported: 2020-08-28 22:40 UTC by Leon Fauster
Modified: 2023-12-15 19:04 UTC (History)
12 users (show)

Fixed In Version: selinux-policy-3.14.3-55.el8
Doc Type: No Doc Update
Doc Text:
Clone Of:
Environment:
Last Closed: 2021-05-18 14:57:54 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)
firefox-dumped-core.txt (95.20 KB, text/plain)
2020-08-28 23:55 UTC, Leon Fauster 		no flags Details
20200914 coredumped-firefox.txt (93.78 KB, text/plain)
2020-09-14 20:05 UTC, Leon Fauster 		no flags Details
View All


Links
System ID Private Priority Status Summary Last Updated
Red Hat Bugzilla 1723308 0 unspecified CLOSED SELinux is preventing rtkit-daemon from 'sys_ptrace' accesses on the cap_userns labeled rtkit_daemon_t. 2023-09-14 05:30:45 UTC

Description Leon Fauster 2020-08-28 22:40:20 UTC 
Description of problem:

Since the update to 78: Playing videos on websites in firefox triggers SElinux deny AVC.


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

$ rpm -q firefox
firefox-78.2.0-2.el8_2.x86_64




Actual results:

# journalctl -f 

Aug 29 00:30:54 stand.localdomain xdg-desktop-por[9312]: Failed to get application states: GDBus.Error:org.freedesktop.portal.Error.Failed: Could not get window list: GDBus.Error:org.freedesktop.DBus.Error.AccessDenied: App introspection not allowed
Aug 29 00:30:56 stand.localdomain rtkit-daemon[2052]: Supervising 5 threads of 3 processes of 1 users.
Aug 29 00:30:56 stand.localdomain rtkit-daemon[2052]: Supervising 5 threads of 3 processes of 1 users.
Aug 29 00:30:56 stand.localdomain rtkit-daemon[2052]: Supervising 5 threads of 3 processes of 1 users.
Aug 29 00:30:56 stand.localdomain rtkit-daemon[2052]: Supervising 5 threads of 3 processes of 1 users.
Aug 29 00:30:56 stand.localdomain rtkit-daemon[2052]: Successfully made thread 16396 of process 14519 (n/a) owned by '1200' RT at priority 10.
Aug 29 00:30:56 stand.localdomain rtkit-daemon[2052]: Supervising 6 threads of 4 processes of 1 users.
Aug 29 00:30:59 stand.localdomain dbus-daemon[2025]: [system] Activating service name='org.fedoraproject.Setroubleshootd' requested by ':1.1202' (uid=0 pid=1993 comm="/usr/sbin/sedispatch " label="system_u:system_r:auditd_t:s0") (using servicehelper)
Aug 29 00:30:59 stand.localdomain dbus-daemon[16410]: [system] Failed to reset fd limit before activating service: org.freedesktop.DBus.Error.AccessDenied: Failed to restore old fd limit: Operation not permitted
Aug 29 00:31:00 stand.localdomain dbus-daemon[2025]: [system] Successfully activated service 'org.fedoraproject.Setroubleshootd'
Aug 29 00:31:01 stand.localdomain setroubleshoot[16410]: SELinux is preventing /usr/libexec/rtkit-daemon from sys_ptrace access on the cap_userns labeled rtkit_daemon_t. For complete SELinux messages run: sealert -l da049452-7ae1-4211-a105-d320cb78ee45
Aug 29 00:31:01 stand.localdomain platform-python[16410]: SELinux is preventing /usr/libexec/rtkit-daemon from sys_ptrace access on the cap_userns labeled rtkit_daemon_t.
                                                          
                                                          *****  Plugin catchall (100. confidence) suggests   **************************
                                                          
                                                          If you believe that rtkit-daemon should be allowed sys_ptrace access on cap_userns labeled rtkit_daemon_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 'rtkit-daemon' --raw | audit2allow -M my-rtkitdaemon
                                                          # semodule -X 300 -i my-rtkitdaemon.pp
                                                          
Aug 29 00:31:09 stand.localdomain org.gnome.Shell.desktop[7139]: libinput error: client bug: timer event8 debounce short: offset negative (-0ms)
Aug 29 00:31:45 stand.localdomain org.gnome.Shell.desktop[7139]: libinput error: client bug: timer event8 debounce short: offset negative (-10ms)




# ausearch -m avc |tail
----
time->Sat Aug 29 00:30:56 2020
type=PROCTITLE msg=audit(1598653856.832:453): proctitle="/usr/libexec/rtkit-daemon"
type=SYSCALL msg=audit(1598653856.832:453): arch=c000003e syscall=89 success=no exit=-13 a0=7ffe30821fb0 a1=7ffe30822120 a2=7f a3=0 items=0 ppid=1 pid=2052 auid=4294967295 uid=172 gid=172 euid=172 suid=172 fsuid=172 egid=172 sgid=172 fsgid=172 tty=(none) ses=4294967295 comm="rtkit-daemon" exe="/usr/libexec/rtkit-daemon" subj=system_u:system_r:rtkit_daemon_t:s0 key=(null)
type=AVC msg=audit(1598653856.832:453): avc:  denied  { sys_ptrace } for  pid=2052 comm="rtkit-daemon" capability=19  scontext=system_u:system_r:rtkit_daemon_t:s0 tcontext=system_u:system_r:rtkit_daemon_t:s0 tclass=cap_userns permissive=0
Comment 1 Leon Fauster 2020-08-28 23:55:14 UTC 
And dumped core : firefox-dumped-core.txt
Comment 2 Leon Fauster 2020-08-28 23:55:32 UTC 
Created attachment 1713022 [details]
firefox-dumped-core.txt
Comment 3 adam winberg 2020-09-02 09:28:56 UTC 
Can confirm, since update to firefox-78.2.0-2.el8_2.x86_64 all of our users get this SELinux denial when using video conference - which we do a lot right now!
Comment 4 Milos Malik 2020-09-07 14:04:16 UTC 
----
type=PROCTITLE msg=audit(09/07/2020 15:58:06.648:175) : proctitle=/usr/libexec/rtkit-daemon 
type=PATH msg=audit(09/07/2020 15:58:06.648:175) : item=0 name=//3947/exe inode=67224 dev=00:04 mode=link,777 ouid=unconfined-user ogid=unconfined-user rdev=00:00 obj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 nametype=NORMAL cap_fp=none cap_fi=none cap_fe=0 cap_fver=0 cap_frootid=0 
type=CWD msg=audit(09/07/2020 15:58:06.648:175) : cwd=/ 
type=SYSCALL msg=audit(09/07/2020 15:58:06.648:175) : arch=x86_64 syscall=readlink success=no exit=EACCES(Permission denied) a0=0x7ffd534d57a0 a1=0x7ffd534d5910 a2=0x7f a3=0x0 items=1 ppid=1 pid=1681 auid=unset uid=rtkit gid=rtkit euid=rtkit suid=rtkit fsuid=rtkit egid=rtkit sgid=rtkit fsgid=rtkit tty=(none) ses=unset comm=rtkit-daemon exe=/usr/libexec/rtkit-daemon subj=system_u:system_r:rtkit_daemon_t:s0 key=(null) 
type=AVC msg=audit(09/07/2020 15:58:06.648:175) : avc:  denied  { sys_ptrace } for  pid=1681 comm=rtkit-daemon capability=sys_ptrace  scontext=system_u:system_r:rtkit_daemon_t:s0 tcontext=system_u:system_r:rtkit_daemon_t:s0 tclass=cap_userns permissive=0 
----

# rpm -qa firefox\* selinux-policy\* rtkit\* | sort
firefox-78.2.0-3.el8.x86_64
rtkit-0.11-19.el8.x86_64
selinux-policy-3.14.3-53.el8.noarch
selinux-policy-devel-3.14.3-53.el8.noarch
selinux-policy-doc-3.14.3-53.el8.noarch
selinux-policy-minimum-3.14.3-53.el8.noarch
selinux-policy-mls-3.14.3-53.el8.noarch
selinux-policy-sandbox-3.14.3-53.el8.noarch
selinux-policy-targeted-3.14.3-53.el8.noarch
#
Comment 5 Zdenek Pytela 2020-09-07 14:49:19 UTC 
As this is basically a clone of Fedora bz#1723308, switching component to selinux-policy. If you feel this needs rtkit developers attention, feel free to switch it back.

Note there was also bz#1750024 for sys_nice capability which is not in RHEL 8 either atm.
Comment 9 Leon Fauster 2020-09-14 20:04:19 UTC 
Are this coredumps related or should i open a new report?
Comment 10 Leon Fauster 2020-09-14 20:05:15 UTC 
Created attachment 1714848 [details]
20200914 coredumped-firefox.txt
Comment 11 Zdenek Pytela 2020-09-15 12:03:36 UTC 
Leon,

I cannot assess if it is related.

You can create a custom selinux policy module to allow the permission and check further.

  # cat local_firefox_rtkit.cil
(allow rtkit_daemon_t self (cap_userns (sys_ptrace)))

  # semodule -i local_firefox_rtkit.cil
Comment 12 Zdenek Pytela 2020-09-29 18:33:59 UTC 
*** Bug 1873695 has been marked as a duplicate of this bug. ***
Comment 21 errata-xmlrpc 2021-05-18 14:57:54 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 (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-2021:1639
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