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KVM: s390: Fix for user-triggerable WARN_ON

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A malicious user space can provide an invalid mode for runtime
 instrumentation via the interfaces that are normally used on
 the target host during migration. This would trigger a WARN_ON
 via validity intercept. Let's detect this special case.
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Merge tag 'kvm-s390-master-4.9-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux

KVM: s390: Fix for user-triggerable WARN_ON

A malicious user space can provide an invalid mode for runtime
instrumentation via the interfaces that are normally used on
the target host during migration. This would trigger a WARN_ON
via validity intercept. Let's detect this special case.
This commit is contained in:
Radim Krčmář 2016-10-20 20:31:01 +02:00
commit 3633031db5
1 changed files with 7 additions and 2 deletions
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9
arch/s390/kvm/intercept.c
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@ -119,8 +119,13 @@ static int handle_validity(struct kvm_vcpu *vcpu)
vcpu->stat.exit_validity++;
trace_kvm_s390_intercept_validity(vcpu, viwhy);
WARN_ONCE(true, "kvm: unhandled validity intercept 0x%x\n", viwhy);
return -EOPNOTSUPP;
KVM_EVENT(3, "validity intercept 0x%x for pid %u (kvm 0x%pK)", viwhy,
current->pid, vcpu->kvm);
/* do not warn on invalid runtime instrumentation mode */
WARN_ONCE(viwhy != 0x44, "kvm: unhandled validity intercept 0x%x\n",
viwhy);
return -EINVAL;
}
static int handle_instruction(struct kvm_vcpu *vcpu)