Bug 1226108

Summary: duplicate: Unprivledged circumvention of MNT_LOCKED mount points exposes underlying filesystem.
Product: [Other] Security Response Reporter: Wade Mealing <wmealing>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED DUPLICATE QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: agordeev, aquini, arm-mgr, bhu, blc, ccoleman, dhoward, dmcphers, esammons, fhrbata, gansalmon, iboverma, itamar, jforbes, jialiu, joelsmith, jokerman, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, kseifried, kstutsma, lmeyer, lwang, madhu.chinakonda, matt, mchehab, mcressma, mguzik, mlangsdo, mmccomas, mrg-program-list, nmurray, pholasek, plougher, rvrbovsk, williams
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2015-08-26 01:11:06 UTC Type: ---
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:    
Bug Blocks: 1213949    

Description Wade Mealing 2015-05-29 02:58:12 UTC 
It was reported[1] to the Linux Containers list that it would be possible to use user namespaces to circumvent MNT_LOCKED and allow unprivileged users to access the directory structure underneath of mounts. A PoC was also produced and is public.


Resources:

[1] https://groups.google.com/forum/#!topic/linux.kernel/HnegnbXk0Vs
[2] http://www.spinics.net/lists/linux-containers/msg30786.html
Comment 1 Wade Mealing 2015-08-26 01:11:06 UTC 
Didn't think this got made.. tooling bug.

*** This bug has been marked as a duplicate of bug 1226751 ***