linux-kernel - Re: [PATCH 2/2] uacce: add uacce module

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Date:   Thu, 15 Aug 2019 16:13:51 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Zhangfei Gao <zhangfei.gao@...aro.org>
Cc:     Arnd Bergmann <arnd@...db.de>, linux-accelerators@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, Kenneth Lee <liguozhu@...ilicon.com>,
        Zaibo Xu <xuzaibo@...wei.com>,
        Zhou Wang <wangzhou1@...ilicon.com>
Subject: Re: [PATCH 2/2] uacce: add uacce module

On Wed, Aug 14, 2019 at 05:34:25PM +0800, Zhangfei Gao wrote:
> +int uacce_register(struct uacce *uacce)
> +{
> +	int ret;
> +
> +	if (!uacce->pdev) {
> +		pr_debug("uacce parent device not set\n");
> +		return -ENODEV;
> +	}
> +
> +	if (uacce->flags & UACCE_DEV_NOIOMMU) {
> +		add_taint(TAINT_CRAP, LOCKDEP_STILL_OK);
> +		dev_warn(uacce->pdev,
> +			 "Register to noiommu mode, which export kernel data to user space and may vulnerable to attack");
> +	}

THat is odd, why even offer this feature then if it is a major issue?

thanks,

greg k-h