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Bug 1113922 - AVC denial when running docker build
Summary: AVC denial when running docker build
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: selinux-policy
Version: 7.0
Hardware: All
OS: Linux
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Miroslav Grepl
QA Contact: Dalibor Pospíšil
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2014-06-27 08:40 UTC by Jan Pazdziora
Modified: 2015-03-05 10:40 UTC (History)
4 users (show)

Fixed In Version: selinux-policy-3.13.1-1.el7
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2015-03-05 10:40:31 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2015:0458 0 normal SHIPPED_LIVE selinux-policy bug fix and enhancement update 2015-03-05 15:17:00 UTC

Description Jan Pazdziora 2014-06-27 08:40:16 UTC 
Description of problem:

Sometimes when running docker build, AVC denial

type=AVC msg=audit(1403853327.352:480): avc:  denied  { mknod } for  pid=2832 comm="mknod" capability=27  scontext=system_u:system_r:svirt_lxc_net_t:s0:c420,c758 tcontext=system_u:system_r:svirt_lxc_net_t:s0:c420,c758 tclass=capability

is logged.

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

docker-0.11.1-19.el7.x86_64
selinux-policy-targeted-3.12.1-153.el7.noarch

How reproducible:

Not deterministic.

Steps to Reproduce:
1. Run docker build for some Dockerfile.
2. Observe audit.log.

Actual results:

type=SYSCALL msg=audit(1403854285.106:579): arch=c000003e syscall=133 success=no exit=-1 a0=7fffae76abd7 a1=21b6 a2=10b a3=7fffae769130 items=0 ppid=5489 pid=77
78 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="mknod" exe="/usr/bin/mknod" subj=system_u:system_r:sv
irt_lxc_net_t:s0:c31,c293 key=(null)
type=AVC msg=audit(1403854285.107:580): avc:  denied  { mknod } for  pid=7779 comm="mknod" capability=27  scontext=system_u:system_r:svirt_lxc_net_t:s0:c31,c293
 tcontext=system_u:system_r:svirt_lxc_net_t:s0:c31,c293 tclass=capability

Expected results:

No AVC denial.

Additional info:

I also saw it on Fedora 20 with docker-io-1.0.0-4.fc20.x86_64.
Comment 2 Daniel Walsh 2014-10-03 15:56:21 UTC 
Any idea which package is doing a mknod?  Sadly I believe we will need to allow this...
Comment 3 Milos Malik 2014-10-03 18:20:29 UTC 
# rpm -qa selinux-policy\*
selinux-policy-3.13.1-1.el7.noarch
selinux-policy-devel-3.13.1-1.el7.noarch
selinux-policy-targeted-3.13.1-1.el7.noarch
selinux-policy-mls-3.13.1-1.el7.noarch
# sesearch -s svirt_lxc_net_t -t svirt_lxc_net_t -c capability -A -C -p mknod
Found 3 semantic av rules:
   allow svirt_lxc_net_t svirt_lxc_net_t : capability { chown dac_override fowner kill setgid setuid setpcap net_bind_service net_admin net_raw sys_chroot mknod audit_write setfcap } ; 
DT allow svirt_lxc_net_t svirt_lxc_net_t : capability mknod ; [ virt_sandbox_use_mknod ]
DT allow svirt_lxc_net_t svirt_lxc_net_t : capability { chown dac_override dac_read_search fowner fsetid kill setgid setuid setpcap linux_immutable net_bind_service net_broadcast net_admin net_raw ipc_lock ipc_owner sys_module sys_rawio sys_chroot sys_ptrace sys_pacct sys_admin sys_boot sys_nice sys_resource sys_time sys_tty_config mknod lease audit_write audit_control setfcap } ; [ virt_sandbox_use_all_caps ]
#

It's already allowed in rebased policy for RHEL-7.1.
Comment 4 Daniel Walsh 2014-10-03 19:57:52 UTC 
Yes.

Fixed in 7.1

selinux-policy-3.13.1-1.el7.noarch
Comment 9 errata-xmlrpc 2015-03-05 10:40:31 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://rhn.redhat.com/errata/RHBA-2015-0458.html
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