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KVM: x86: Reload pit counters for all channels when restoring state
authorAndrew Honig <ahonig@google.com>
Wed, 18 Nov 2015 22:50:23 +0000 (14:50 -0800)
committerPaolo Bonzini <pbonzini@redhat.com>
Tue, 22 Dec 2015 14:36:26 +0000 (15:36 +0100)
commit0185604c2d82c560dab2f2933a18f797e74ab5a8
tree227382c16c0ce92f1912892e159f6aa770235f3atree
parente24dea2afc6a0852983dc741072d8e96155e13f5commit | diff
KVM: x86: Reload pit counters for all channels when restoring state

Currently if userspace restores the pit counters with a count of 0
on channels 1 or 2 and the guest attempts to read the count on those
channels, then KVM will perform a mod of 0 and crash.  This will ensure
that 0 values are converted to 65536 as per the spec.

This is CVE-2015-7513.

Signed-off-by: Andy Honig <ahonig@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
arch/x86/kvm/x86.c diff | blob | history
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