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KVM: x86: Assertions to check no overrun in MSR lists 

Currently there is no check whether shared MSRs list overrun the allocated size
which can results in bugs. In addition there is no check that vmx->guest_msrs
has sufficient space to accommodate all the VMX msrs.  This patch adds the
assertions.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Nadav Amit 2014-07-24 15:06:56 +03:00 committed by Paolo Bonzini
parent d6e8c85456
commit 0123be429f
2 changed files with 3 additions and 0 deletions
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2
arch/x86/kvm/vmx.c
View File

@ -7608,6 +7608,8 @@ static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
goto free_vcpu;
vmx->guest_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL);
BUILD_BUG_ON(PAGE_SIZE / sizeof(struct shared_msr_entry) < NR_VMX_MSR);
err = -ENOMEM;
if (!vmx->guest_msrs) {
goto uninit_vcpu;

1
arch/x86/kvm/x86.c
View File

@ -212,6 +212,7 @@ static void shared_msr_update(unsigned slot, u32 msr)
void kvm_define_shared_msr(unsigned slot, u32 msr)
{
BUG_ON(slot >= KVM_NR_SHARED_MSRS);
if (slot >= shared_msrs_global.nr)
shared_msrs_global.nr = slot + 1;
shared_msrs_global.msrs[slot] = msr;