KVM: x86: Improve thread safety in pit

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commit 2febc83913 upstream.

There's a race condition in the PIT emulation code in KVM.  In
__kvm_migrate_pit_timer the pit_timer object is accessed without
synchronization.  If the race condition occurs at the wrong time this
can crash the host kernel.

This fixes CVE-2014-3611.

Signed-off-by: Andrew Honig <ahonig@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

...

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Andy Honig 2014-08-27 14:42:54 -07:00 • committed by Luis Henriques

parent 78c4e45457

commit 262400a71a

1 changed files with 2 additions and 0 deletions

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arch/x86/kvm/i8254.c

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