Date: Tue, 02 Feb 2010 13:38:00 +0800 From: Eugene Teo <eugeneteo@...nel.sg> To: oss-security@...ts.openwall.com CC: "Steven M. Christey" <coley@...us.mitre.org> Subject: CVE request - kvm: cat /dev/port in the guest can cause host DoS The problem is pit_state->channels has 3 elements, and pit_ioport_read uses "addr" as index to pit_get_count, so inb(0x43) reads (and potentially writes) into other data of kvm_kpit_state. PIT control word (address 0x43) is write-only, reads are undefined. Triggering this can cause a general protection fault on the host. https://bugzilla.redhat.com/show_bug.cgi?id=560887 http://www.mail-archive.com/kvm@...r.kernel.org/msg28002.html Thanks, Eugene -- Eugene Teo / Red Hat Security Response Team
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