Re: [PATCH 2/3] KVM: s390: zero initialize irq for inject_pfault_token
Matthew Rosato <[email protected]>
| Newsgroups | org.kernel.vger.linux-s390,org.kernel.vger.kvm,org.kernel.vger.stable |
|---|---|
| Message-ID | <[email protected]> |
On 8/4/26 8:06 AM, Christian Borntraeger wrote:
> __kvm_inject_pfault_token() only sets .type and .u.ext.ext_params2 of
> the on-stack struct kvm_s390_irq but the full ext substructure is copied
> into the cpu local variable on inject. ext_params and pad contain stale
> stack values.
>
> Interrupt delivery only uses ext_params2, so nothing leaks, but a host
> user can use the migration ioctls to get to the data.
>
> Fix by zero-initializing the irq struct.
>
> Fixes: 383d0b050106 ("KVM: s390: handle pending local interrupts via bitmap")
> Cc: [email protected]
> Signed-off-by: Christian Borntraeger <[email protected]>
Reviewed-by: Matthew Rosato <[email protected]>
> ---
> arch/s390/kvm/kvm-s390.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index 4a38de3d6758..447e6a61f886 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -4474,7 +4474,7 @@ static void __kvm_inject_pfault_token(struct kvm_vcpu *vcpu, bool start_token,
> unsigned long token)
> {
> struct kvm_s390_interrupt inti;
> - struct kvm_s390_irq irq;
> + struct kvm_s390_irq irq = {};
> struct kvm_s390_interrupt_info *inti_mem = NULL;
> int ret = 0;
>