oss-security - Re: CVE-2017-1000252: KVM denial of service with posted interrupts on Intel systems (since Linux 4.4)

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Message-ID: <20171002120644.GA4301@kroah.com>
Date: Mon, 2 Oct 2017 14:06:44 +0200
From: Greg KH <greg@...ah.com>
To: oss-security@...ts.openwall.com
Subject: Re: CVE-2017-1000252: KVM denial of service with
 posted interrupts on Intel systems (since Linux 4.4)

On Fri, Sep 15, 2017 at 06:36:59PM +0200, Jan H. Schönherr wrote:
> Hi.
> 
> We have discovered a user triggerable BUG() when using KVM with posted interrupts on Intel
> systems. This requires an unprivileged user to have access to the KVM device.
> 
> Certain values in a KVM_IRQFD API call can trigger a BUG_ON() at a later point in
> vmx_update_pi_irte(). KVM as a whole seems to hang after that.
> 
> The issue was introduced with Linux 4.4, patches have been posted to the KVM
> mailing list:
> - https://marc.info/?l=kvm&m=150549145711115&w=2
> - https://marc.info/?l=kvm&m=150549146311117&w=2

Note, for those intersted in this, the second patch was reverted and
doesn't seem to be needed.

thanks,

greg k-h

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