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Bug 1554868

Summary: [3.4] subpath volume mounts do not work with secret, configmap, projected, or downwardAPI volumes
Product: OpenShift Container Platform Reporter: Jan Safranek <jsafrane>
Component: StorageAssignee: Jan Safranek <jsafrane>
Status: CLOSED CURRENTRELEASE QA Contact: Wenqi He <wehe>
Severity: high Docs Contact:
Priority: unspecified    
Version: 3.4.1CC: aos-bugs, aos-storage-staff, bchilds, dma, jhou, mifiedle, vlaad
Target Milestone: ---   
Target Release: 3.4.z   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Cause: OpenShift did not check correctly for parent directories when creating SubPath. Consequence: Secrets, ConfigMap, DownwardAPI and Projected volumes could not be used with SubPaths in pods. Fix: OpenShift correctly evaluates parent directories. Result: Secrets, ConfigMap, DownwardAPI and Projected volumes can be used with SubPaths in pods.
 Story Points: ---
Clone Of: 1554670 Environment:
Last Closed: 2018-10-08 13:55:26 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 1554670, 1663260    
Bug Blocks:    

Description Jan Safranek 2018-03-13 13:40:40 UTC 
+++ This bug was initially created as a clone of Bug #1554670 +++

Description of problem:

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

3.9.7-1

How reproducible:

Always

Steps to Reproduce:
1. Create a pod with a secret, configmap, downwardAPI and projected volume
2. Create volume mounts for each of those volumes that make use of the subPath feature

Actual results:

The pod will not start with errors like 

failed to prepare subPath for volumeMount "config" of container "mumble": subpath "/var/lib/kubelet/pods/66fa673c-266d-11e8-8ebf-00155d00a406/volumes/kubernetes.io~configmap/config/..2018_03_13_03_19_55.572152209/mumble.ini" not within volume path "/var/lib/kubelet/pods/66fa673c-266d-11e8-8ebf-00155d00a406/volumes/kubernetes.io~configmap/config"


Expected results:

Pod starts properly and volume mounts work


Regression introduced as part of the fix for https://bugzilla.redhat.com/show_bug.cgi?id=1519365

Upstream issue: https://github.com/kubernetes/kubernetes/issues/61076#issuecomment-372554309

The security fix was backported all the way to 3.3, which means this regression was as well.

--- Additional comment from Jordan Liggitt on 2018-03-13 09:10:27 EDT ---

this affects use of subPath volume mounts with any secret, configmap, projected, or downwardAPI volume

--- Additional comment from Jordan Liggitt on 2018-03-13 09:13:45 EDT ---

upstream fix in https://github.com/kubernetes/kubernetes/pull/61080
Comment 1 Jan Safranek 2018-03-14 11:15:46 UTC 
OSE PR: https://github.com/openshift/ose/pull/1123
Comment 3 Wenqi He 2018-04-18 03:03:48 UTC 
Tested on below version:
openshift v3.4.1.44.53
kubernetes v1.4.0+776c994

# uname -a
Linux 3.10.0-514.6.1.el7.x86_64 #1 SMP Sat Dec 10 11:15:38 EST 2016 x86_64 x86_64 x86_64 GNU/Linux
# cat /etc/redhat-release
Red Hat Enterprise Linux Server release 7.3 (Maipo)

secret, configmap, projected, or downwardAPI pods with subpath could be running
# oc get pods
NAME                        READY     STATUS    RESTARTS   AGE
configmap                   1/1       Running   0          1m
downwordapi                 1/1       Running   0          21s
secret                      1/1       Running   0          8m
projected                   1/1       Running   0          29s