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List:       oss-security
Subject:    [oss-security] CVE-2016-5412 Kernel: powerpc: kvm: Infinite loop via H_CEDE hypercall when running u
From:       P J P <ppandit () redhat ! com>
Date:       2016-07-28 11:42:39
Message-ID: alpine.LFD.2.20.1607281651320.26930 () wniryva
[Download RAW message or body]

   Hello,

Linux kernel built with for the PowerPC platform with KVM Virtualisation with 
hypervisor-mode support(CONFIG_KVM_BOOK3S_64_HV) enabled is vulnerable to a 
DoS issue. It could occur if 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.

A user/process inside guest could use this flaw to crash the host kernel 
resulting in DoS.

Upstream patches:
-----------------
   -> https://marc.info/?l=kvm&m=146968629127349&w=2

Reference:
----------
   -> https://bugzilla.redhat.com/show_bug.cgi?id=1349916


Thank you.
--
Prasad J Pandit / Red Hat Product Security Team
47AF CE69 3A90 54AA 9045 1053 DD13 3D32 FE5B 041F
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