Bug 1679334 (CVE-2019-17344)

Summary: CVE-2019-17344 xen: xsa290: missing preemption in x86 PV page table unvalidation
Product: [Other] Security Response Reporter: Pedro Sampaio <psampaio>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED WONTFIX QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: ailan, drjones, imammedo, jforbes, knoel, m.a.young, mrezanin, pbonzini, rkrcmar, robinlee.sysu, security-response-team, vkuznets, xen-maint
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Fixed In Version: Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2019-06-10 10:48:34 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: 1685577    
Bug Blocks:    

Description Pedro Sampaio 2019-02-20 22:17:37 UTC
XSA-273 changes required, among other things, making any PTE updates
restartable. The changes making PTE updates restartable assumed that L2
pagetables would always be promoted preemptibly; but this turns out not
to be the case when using the 'linear pagetable' feature; the result was
that interrupted operations are not handled properly in certain cases.

Furthermore, previous security work making pagetable update preemptible
failed to account for 'linear pagetables' at L3 and L4 levels, making it
possible for operations to run for longer than acceptable times.

Comment 1 Andrej Nemec 2019-03-05 14:20:22 UTC


Comment 2 Andrej Nemec 2019-03-05 14:26:47 UTC
Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1685577]