> +			if ((current->nsproxy == NULL && new_nsproxy != NULL) ||
quoted text
> +				(current->nsproxy != NULL && new_nsproxy == NULL) ||
> +				(current->nsproxy != NULL && new_nsproxy != NULL && current->nsproxy->ipc_ns != new_nsproxy->ipc_ns)) {

Is the if (unshare_flags & CLONE_NEWIPC) check not enough?

Thanks,
Pavel
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