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Bug 1458999 - /usr/lib/systemd/systemd-sysctl AVC denied on RHEL-7.4-20170601.0
Summary: /usr/lib/systemd/systemd-sysctl AVC denied on RHEL-7.4-20170601.0
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: selinux-policy
Version: 7.4
Hardware: All
OS: Linux
unspecified
medium
Target Milestone: rc
: ---
Assignee: Lukas Vrabec
QA Contact: Milos Malik
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2017-06-06 06:01 UTC by Chao Ye
Modified: 2017-08-01 15:28 UTC (History)
11 users (show)

Fixed In Version: selinux-policy-3.13.1-160.el7
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2017-08-01 15:28:52 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2017:1861 0 normal SHIPPED_LIVE selinux-policy bug fix update 2017-08-01 17:50:24 UTC

Description Chao Ye 2017-06-06 06:01:41 UTC 
Description of problem:
Info: Searching AVC errors produced since 1496677607.77 (Mon Jun  5 11:46:47 2017)
Searching logs...
Running '/usr/bin/env LC_ALL=en_US.UTF-8 /sbin/ausearch -m AVC -m USER_AVC -m SELINUX_ERR -ts 06/05/2017 11:46:47 < /dev/null >/mnt/testarea/tmp.rhts-db-submit-result.MAPl5N 2>&1'
----
time->Mon Jun  5 15:46:36 2017
type=PROCTITLE msg=audit(1496691996.800:22): proctitle="/lib/systemd/systemd-sysctl"
type=SYSCALL msg=audit(1496691996.800:22): arch=c000003e syscall=1 success=no exit=-1 a0=4 a1=7f6fa2b17000 a2=2 a3=22 items=0 ppid=702 pid=780 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="systemd-sysctl" exe="/usr/lib/systemd/systemd-sysctl" subj=system_u:system_r:systemd_sysctl_t:s0 key=(null)
type=AVC msg=audit(1496691996.800:22): avc:  denied  { sys_ptrace } for  pid=780 comm="systemd-sysctl" capability=19  scontext=system_u:system_r:systemd_sysctl_t:s0 tcontext=system_u:system_r:systemd_sysctl_t:s0 tclass=capability
----
time->Mon Jun  5 15:46:37 2017
type=PROCTITLE msg=audit(1496691997.116:23): proctitle="/lib/systemd/systemd-sysctl"
type=SYSCALL msg=audit(1496691997.116:23): arch=c000003e syscall=1 success=no exit=-1 a0=4 a1=7f7fe2612000 a2=2 a3=22 items=0 ppid=702 pid=925 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="systemd-sysctl" exe="/usr/lib/systemd/systemd-sysctl" subj=system_u:system_r:systemd_sysctl_t:s0 key=(null)
type=AVC msg=audit(1496691997.116:23): avc:  denied  { sys_ptrace } for  pid=925 comm="systemd-sysctl" capability=19  scontext=system_u:system_r:systemd_sysctl_t:s0 tcontext=system_u:system_r:systemd_sysctl_t:s0 tclass=capability
Fail: AVC messages found.
Checking for errors...
Using stronger AVC checks.
	Define empty RHTS_OPTION_STRONGER_AVC parameter if this causes any problems.
Running 'cat /mnt/testarea/tmp.rhts-db-submit-result.MAPl5N | /sbin/ausearch -m AVC -m SELINUX_ERR'
Fail: AVC messages found.
Running 'cat %s | /sbin/ausearch -m USER_AVC >/mnt/testarea/tmp.rhts-db-submit-result.hdpgcI 2>&1'
Info: No AVC messages found.
/bin/grep 'avc: ' /mnt/testarea/dmesg.log | /bin/grep --invert-match TESTOUT.log
Following messages were found in dmesg:
[    3.754483] type=1400 audit(1496691995.072:4): avc:  denied  { sys_ptrace } for  pid=469 comm="systemd-sysctl" capability=19  scontext=system_u:system_r:systemd_sysctl_t:s0 tcontext=system_u:system_r:systemd_sysctl_t:s0 tclass=capability
Running '/usr/sbin/sestatus'
SELinux status:                 enabled
SELinuxfs mount:                /sys/fs/selinux
SELinux root directory:         /etc/selinux
Loaded policy name:             targeted
Current mode:                   enforcing
Mode from config file:          enforcing
Policy MLS status:              enabled
Policy deny_unknown status:     allowed
Max kernel policy version:      28
Running 'rpm -q selinux-policy || true'
selinux-policy-3.13.1-154.el7.noarch

Version-Release number of selected component (if applicable):
selinux-policy-3.13.1-154.el7.noarch

How reproducible:
Once

Steps to Reproduce:
1.
2.
3.

Actual results:


Expected results:


Additional info:
Beaker Job:
https://beaker.engineering.redhat.com/recipes/3912741
Comment 3 Lukas Vrabec 2017-06-06 08:10:26 UTC 
We should back port this from Fedora.
Comment 5 Milos Malik 2017-06-06 14:53:52 UTC 
Confirmed. Reproducible with kernel-3.10.0-679.el7.

SELinux denial caught in enforcing mode is:
----
type=PROCTITLE msg=audit(06/06/2017 10:51:24.217:75) : proctitle=/usr/lib/systemd/systemd-sysctl 
type=SYSCALL msg=audit(06/06/2017 10:51:24.217:75) : arch=x86_64 syscall=write success=no exit=EPERM(Operation not permitted) a0=0x4 a1=0x7f7b444eb000 a2=0x2 a3=0x22 items=0 ppid=1 pid=10235 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=systemd-sysctl exe=/usr/lib/systemd/systemd-sysctl subj=system_u:system_r:systemd_sysctl_t:s0 key=(null) 
type=AVC msg=audit(06/06/2017 10:51:24.217:75) : avc:  denied  { sys_ptrace } for  pid=10235 comm=systemd-sysctl capability=sys_ptrace  scontext=system_u:system_r:systemd_sysctl_t:s0 tcontext=system_u:system_r:systemd_sysctl_t:s0 tclass=capability 
----

SELinux denial caught in permissive mode is:
----
type=PROCTITLE msg=audit(06/06/2017 10:52:06.415:80) : proctitle=/usr/lib/systemd/systemd-sysctl 
type=SYSCALL msg=audit(06/06/2017 10:52:06.415:80) : arch=x86_64 syscall=write success=yes exit=2 a0=0x4 a1=0x7f38a32d9000 a2=0x2 a3=0x22 items=0 ppid=1 pid=10257 auid=unset uid=root gid=root euid=root suid=root fsuid=root egid=root sgid=root fsgid=root tty=(none) ses=unset comm=systemd-sysctl exe=/usr/lib/systemd/systemd-sysctl subj=system_u:system_r:systemd_sysctl_t:s0 key=(null) 
type=AVC msg=audit(06/06/2017 10:52:06.415:80) : avc:  denied  { sys_ptrace } for  pid=10257 comm=systemd-sysctl capability=sys_ptrace  scontext=system_u:system_r:systemd_sysctl_t:s0 tcontext=system_u:system_r:systemd_sysctl_t:s0 tclass=capability 
----

# cat /proc/sys/kernel/yama/ptrace_scope 
0
#
Comment 9 errata-xmlrpc 2017-08-01 15:28:52 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, 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-2017:1861
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