Bug 1554864

Summary: [3.8] 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: Liang Xia <lxia>
Severity: high Docs Contact:
Priority: unspecified    
Version: 3.8.0CC: aos-bugs, aos-storage-staff, bchilds, bleanhar, jhou, lxia, mifiedle, yapei
Target Milestone: ---   
Target Release: 3.8.0   
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: 2019-11-21 18:37:56 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, 1554871, 1663260    
Bug Blocks:    

Description Jan Safranek 2018-03-13 13:40:21 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 2018-03-13 18:24:00 UTC 
OSE PR: https://github.com/openshift/ose/pull/1111
Comment 3 Wenqi He 2018-03-22 08:11:09 UTC 
Tested on below version:
openshift v3.8.36
kubernetes v1.8.5+440f8d36da

subPath volume mount works for secret, configmap, projected, or downwardAPI.