Bug 1327626 - Qemu: timer: a9gtimer: Infinite loop unfolds when updating a9gtimer
Summary: Qemu: timer: a9gtimer: Infinite loop unfolds when updating a9gtimer
Status: CLOSED UPSTREAM
Alias: None
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard: impact=low,public=20160922,reported=2...
Keywords: Security
Depends On: 1388300 1388301
Blocks: 1326713
TreeView+ depends on / blocked
 
Reported: 2016-04-15 13:46 UTC by Adam Mariš
Modified: 2019-06-08 21:07 UTC (History)
40 users (show)

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Clone Of:
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Last Closed: 2017-02-07 07:16:56 UTC


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Description Adam Mariš 2016-04-15 13:46:16 UTC
Quick Emulator(Qemu) built with the peripheral timer block for ARM A9MP emulator support is vulnerable to an infinite loop issue. It could occur while updating the a9gtimer in 'a9_gtimer_update'.

A privileged user inside guest could use this flaw to consume excessive CPU cycles on the host resulting in DoS.

Upstream patch:
---------------
  -> git.qemu.org/?p=qemu.git;a=commit;h=6be8f5e2626e102433e569d9cece2120baf0c879

Comment 1 Adam Mariš 2016-04-15 13:46:41 UTC
Acknowledgments:

Name: Li Qiang (Qihoo 360, Inc.)

Comment 3 Prasad J Pandit 2016-10-25 05:16:35 UTC
Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1388301]

Comment 4 Prasad J Pandit 2016-10-25 05:16:50 UTC
Created qemu tracking bugs for this issue:

Affects: fedora-all [bug 1388300]


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