Bug 1313812

Summary: kernel: Kernel panic when mounting specially crafted ext2 filesystem
Product: [Other] Security Response Reporter: Adam Mariš <amaris>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: agordeev, anemec, aquini, bhu, dhoward, esammons, fhrbata, iboverma, jkacur, joelsmith, jross, kernel-mgr, kstutsma, lgoncalv, lwang, matt, mcressma, mguzik, nmurray, pholasek, plougher, rvrbovsk, security-response-team, slawomir, vdronov, 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: 2016-05-28 15:15:04 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On: 1322277    
Bug Blocks: 1313817    
Attachments:
Description Flags
Crash report none

Description Adam Mariš 2016-03-02 11:59:00 UTC 
Kernel panic caused by mounting specially crafted ext2 filesystem was found. This issue was tested on linux kernel 3.10, 3.18 and 3.19.
Comment 1 Adam Mariš 2016-03-02 11:59:15 UTC 
Acknowledgments:

Name: Hugues Anguelkov
Comment 2 Adam Mariš 2016-03-02 12:01:10 UTC 
Created attachment 1132278 [details]
Crash report
Comment 5 Andrej Nemec 2016-03-30 08:03:14 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1322277]
Comment 6 Andrej Nemec 2016-03-30 08:03:35 UTC 
Public via:

http://seclists.org/oss-sec/2016/q1/709
Comment 7 Josh Boyer 2016-03-31 12:22:02 UTC 
Upstream's stance on this bug:

http://marc.info/?l=linux-ext4&m=145937069606704&w=2

Basically, they plan on doing nothing in the kernel.

The two suggestions of running fsck and mounting with -o errors=continue are feasible, but they would need to be done in userspace.
Comment 8 Vladis Dronov 2016-05-28 15:15:04 UTC 
Statement:

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6, 7 and MRG-2. This has been rated as having Low security impact, as this is actually not a security flaw but intended kernel reaction. This is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.