Bug 678209 (CVE-2011-0999)

Summary: CVE-2011-0999 kernel: thp: prevent hugepages during args/env copying into the user stack
Product: [Other] Security Response Reporter: Eugene Teo (Security Response) <eteo>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: arozansk, dhoward, kernel-mgr, kmcmartin, lwang, security-response-team, tcallawa, vkrizan
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2015-07-29 13:53:25 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: 674147, 678212, 678213    
Bug Blocks:    

Description Eugene Teo (Security Response) 2011-02-17 06:44:34 UTC
Transparent hugepages can only be created if rmap is fully functional. A specially crafted binary could allow the user stack to grow huge and backed by hugepages without this patch while is_vma_temporary_stack() is true.

This also optmizes away some harmless but unnecessary setting of khugepaged_scan.address and it switches some BUG_ON to VM_BUG_ON.

Comment 2 Eugene Teo (Security Response) 2011-02-17 06:48:31 UTC
Upstream commit:

Comment 5 errata-xmlrpc 2011-05-19 11:58:39 UTC
This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2011:0542 https://rhn.redhat.com/errata/RHSA-2011-0542.html

Comment 7 errata-xmlrpc 2011-06-21 23:53:09 UTC
This issue has been addressed in following products:

  Red Hat Enterprise Linux 6.0.Z - Server Only

Via RHSA-2011:0883 https://rhn.redhat.com/errata/RHSA-2011-0883.html

Comment 8 Eugene Teo (Security Response) 2011-06-29 01:41:14 UTC

This issue only affects Red Hat Enterprise Linux 6. The version of Linux kernel as shipped with Red Hat Enterprise Linux 4, 5, and Red Hat Enterprise MRG as they did not include upstream commit 71e3aac0 that introduced the problem. We have addressed this in Red Hat Enterprise Linux 6 via https://rhn.redhat.com/errata/RHSA-2011-0542.html.