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Bug 1349916 - (CVE-2016-5412) CVE-2016-5412 Kernel: powerpc: kvm: Infinite loop via H_CEDE hypercall when running under hypervisor-mode
CVE-2016-5412 Kernel: powerpc: kvm: Infinite loop via H_CEDE hypercall when r...
Status: NEW
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20160728,repor...
: Security
Depends On: 1349244 1360798 1361040
Blocks: 1348800
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Reported: 2016-06-24 10:21 EDT by Adam Mariš
Modified: 2018-07-18 10:56 EDT (History)
38 users (show)

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Attachments (Terms of Use)
Patch 1 (12.28 KB, patch)
2016-06-24 10:36 EDT, Adam Mariš 		no flags Details | Diff
Patch 2 (1.89 KB, patch)
2016-06-24 10:36 EDT, Adam Mariš 		no flags Details | Diff
Add an attachment (proposed patch, testcase, etc.)


External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2016:2574 normal SHIPPED_LIVE Important: kernel security, bug fix, and enhancement update 2016-11-03 08:06:10 EDT

  None (edit)
Description Adam Mariš 2016-06-24 10:21:14 EDT 
It was reported that when a guest kernel running under hypervisor-mode KVM (i.e. "HV KVM" rather than "PR KVM"), does the H_CEDE hypercall while a suspended transaction exists, the host CPU may, under certain circumstances, hang in an infinite loop with interrupts disabled. To trigger this, it is necessary to have the guest using an SMT mode of at least 2, with another thread in the same core busy at the time that the H_CEDE is done. The other thread doesn't need to be using transactional memory.

Upstream patches:
-----------------
  -> https://marc.info/?l=kvm&m=146968629127349&w=2
Comment 2 Adam Mariš 2016-06-24 10:36 EDT 
Created attachment 1171980 [details]
Patch 1
Comment 3 Adam Mariš 2016-06-24 10:36 EDT 
Created attachment 1171981 [details]
Patch 2
Comment 5 Prasad J Pandit 2016-07-28 04:39:47 EDT 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1361040]
Comment 6 Prasad J Pandit 2016-07-28 07:34:06 EDT 
Statement:

This issue does not affect the versions of Linux kernel as shipped with
Red Hat Enterprise Linux 5, 6 and Red Hat Enterprise MRG 2.

This issue affects the version of the kernel packages as shipped with
Red Hat Enterprise Linux 7. Future kernel updates for Red Hat Enterprise Linux 7 may address this issue.
Comment 10 Fedora Update System 2016-08-15 17:23:28 EDT 
kernel-4.6.6-300.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.
Comment 11 Fedora Update System 2016-08-15 20:50:18 EDT 
kernel-4.6.6-200.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
Comment 15 errata-xmlrpc 2016-11-03 12:45:00 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:2574 https://rhn.redhat.com/errata/RHSA-2016-2574.html
Comment 16 errata-xmlrpc 2016-11-03 17:35:37 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:2574 https://rhn.redhat.com/errata/RHSA-2016-2574.html
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