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Here is a bug I have already reported to CentOS bug tracker (see the "external bug" field), but got no answer. In a discussion on the SELinux mailing, I was told to report the bug here.
Every day, a test script of mines launches new containers, and everyday, since 2016/03/22, I receive the mail below.
On 2016/03/21, I have rebooted to the kernel 3.10.0-327.10.1.el7.x86_64, after an upgrade. That must be related.
Now the mail:
=============== quote =================
From: SELinux_Troubleshoot
To: laurent, sebastien
Date: 2016/03/22 Tue 15:32
SELinux is preventing /usr/bin/id from mounton access on the directory /proc.
***** Plugin catchall (100. confidence) suggests **************************
If you believe that id should be allowed mounton access on the proc directory 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:
# grep id /var/log/audit/audit.log | audit2allow -M mypol
# semodule -i mypol.pp
Additional Information:
Source Context system_u:system_r:svirt_lxc_net_t:s0:c121,c379
Target Context system_u:object_r:proc_t:s0
Target Objects /proc [ dir ]
Source id
Source Path /usr/bin/id
Port <Unknown>
Host cgal.geometryfactory.com
Source RPM Packages coreutils-8.22-15.el7_2.1.x86_64
Target RPM Packages filesystem-3.2-20.el7.x86_64
Policy RPM selinux-policy-3.13.1-60.el7_2.3.noarch
Selinux Enabled True
Policy Type targeted
Enforcing Mode Enforcing
Host Name cgal.geometryfactory.com
Platform Linux cgal.geometryfactory.com
3.10.0-327.10.1.el7.x86_64 #1 SMP Tue Feb 16
17:03:50 UTC 2016 x86_64 x86_64
Alert Count 1
First Seen 2016-03-22 15:31:58 CET
Last Seen 2016-03-22 15:31:58 CET
Local ID 93da552e-6673-4857-809a-433607c3a00e
Raw Audit Messages
type=AVC msg=audit(1458657118.393:90225): avc: denied { mounton } for pid=5174 comm="id" path="/proc" dev="proc" ino=1 scontext=system_u:system_r:svirt_lxc_net_t:s0:c121,c379 tcontext=system_u:object_r:proc_t:s0 tclass=dir
type=SYSCALL msg=audit(1458657118.393:90225): arch=x86_64 syscall=mount success=no exit=EACCES a0=7f17b7535c86 a1=7f17b7535c85 a2=7f17b7535c86 a3=0 items=0 ppid=5173 pid=5174 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm=id exe=/usr/bin/id subj=system_u:system_r:svirt_lxc_net_t:s0:c121,c379 key=(null)
Hash: id,svirt_lxc_net_t,proc_t,dir,mounton
============end of quote =================
I do not know. Nothing special involving `id` or `/proc`.
This bug was reported several months ago, before the upgrade of Docker to 1.10.x. I no longer have that AVC, even though I still launch the test suite with 30 containers every days. Probably the Docker environment has changed, and `id` no longer needs to mount `/proc` by itself.
Here is a bug I have already reported to CentOS bug tracker (see the "external bug" field), but got no answer. In a discussion on the SELinux mailing, I was told to report the bug here. Every day, a test script of mines launches new containers, and everyday, since 2016/03/22, I receive the mail below. On 2016/03/21, I have rebooted to the kernel 3.10.0-327.10.1.el7.x86_64, after an upgrade. That must be related. Now the mail: =============== quote ================= From: SELinux_Troubleshoot To: laurent, sebastien Date: 2016/03/22 Tue 15:32 SELinux is preventing /usr/bin/id from mounton access on the directory /proc. ***** Plugin catchall (100. confidence) suggests ************************** If you believe that id should be allowed mounton access on the proc directory 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: # grep id /var/log/audit/audit.log | audit2allow -M mypol # semodule -i mypol.pp Additional Information: Source Context system_u:system_r:svirt_lxc_net_t:s0:c121,c379 Target Context system_u:object_r:proc_t:s0 Target Objects /proc [ dir ] Source id Source Path /usr/bin/id Port <Unknown> Host cgal.geometryfactory.com Source RPM Packages coreutils-8.22-15.el7_2.1.x86_64 Target RPM Packages filesystem-3.2-20.el7.x86_64 Policy RPM selinux-policy-3.13.1-60.el7_2.3.noarch Selinux Enabled True Policy Type targeted Enforcing Mode Enforcing Host Name cgal.geometryfactory.com Platform Linux cgal.geometryfactory.com 3.10.0-327.10.1.el7.x86_64 #1 SMP Tue Feb 16 17:03:50 UTC 2016 x86_64 x86_64 Alert Count 1 First Seen 2016-03-22 15:31:58 CET Last Seen 2016-03-22 15:31:58 CET Local ID 93da552e-6673-4857-809a-433607c3a00e Raw Audit Messages type=AVC msg=audit(1458657118.393:90225): avc: denied { mounton } for pid=5174 comm="id" path="/proc" dev="proc" ino=1 scontext=system_u:system_r:svirt_lxc_net_t:s0:c121,c379 tcontext=system_u:object_r:proc_t:s0 tclass=dir type=SYSCALL msg=audit(1458657118.393:90225): arch=x86_64 syscall=mount success=no exit=EACCES a0=7f17b7535c86 a1=7f17b7535c85 a2=7f17b7535c86 a3=0 items=0 ppid=5173 pid=5174 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm=id exe=/usr/bin/id subj=system_u:system_r:svirt_lxc_net_t:s0:c121,c379 key=(null) Hash: id,svirt_lxc_net_t,proc_t,dir,mounton ============end of quote =================