oss-sec mailing list archives
Re: CVE-2017-1000252: KVM denial of service with posted interrupts on Intel systems (since Linux 4.4)
From: Greg KH <greg () kroah com>
Date: Mon, 2 Oct 2017 14:06:44 +0200
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
Current thread:
- Re: CVE-2017-1000252: KVM denial of service with posted interrupts on Intel systems (since Linux 4.4) Greg KH (Oct 02)