Re: [RFC PATCH 06/28] arm64: RME: ioctls to create and configure realms

[Jean-Philippe Brucker]

On Fri, Jan 27, 2023 at 11:29:10AM +0000, Steven Price wrote:
> +static int kvm_rme_config_realm(struct kvm *kvm, struct kvm_enable_cap *cap)
> +{
> +	struct kvm_cap_arm_rme_config_item cfg;
> +	struct realm *realm = &kvm->arch.realm;
> +	int r = 0;
> +
> +	if (kvm_realm_state(kvm) != REALM_STATE_NONE)
> +		return -EBUSY;

This should also check kvm_is_realm() (otherwise we dereference a NULL
realm).

I was wondering about fuzzing the API to find more of this kind of issue,
but don't know anything about it. Is there a recommended way to fuzz KVM?

Thanks,
Jean