linux-kernel - Re: [PATCH v2 4/8] cxl/mem: Add basic IOCTL interface

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Message-ID: <YCm5Bs2NalmHgeZn@zeniv-ca.linux.org.uk>
Date:   Sun, 14 Feb 2021 23:57:58 +0000
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Ben Widawsky <ben.widawsky@...el.com>
Cc:     linux-cxl@...r.kernel.org, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-nvdimm@...ts.01.org,
        linux-pci@...r.kernel.org, Bjorn Helgaas <helgaas@...nel.org>,
        Chris Browy <cbrowy@...ry-design.com>,
        Christoph Hellwig <hch@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        David Hildenbrand <david@...hat.com>,
        David Rientjes <rientjes@...gle.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Jon Masters <jcm@...masters.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Rafael Wysocki <rafael.j.wysocki@...el.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Vishal Verma <vishal.l.verma@...el.com>,
        "John Groves (jgroves)" <jgroves@...ron.com>,
        "Kelley, Sean V" <sean.v.kelley@...el.com>,
        kernel test robot <lkp@...el.com>,
        Dan Williams <dan.j.willams@...el.com>
Subject: Re: [PATCH v2 4/8] cxl/mem: Add basic IOCTL interface

On Sun, Feb 14, 2021 at 11:50:12PM +0000, Al Viro wrote:
> 	check that len is reasonable
> 	p = kmalloc(offsetof(struct foo, string[len]), GFP_KERNEL);
> 	copy_from_user(p, user_object, len);
			offsetof(struct foo, string[len]), that is