linux-kernel - Re: [PATCH v5 0/6] nvdimm: Add an IOCTL pass thru for DSM calls

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Date:	Sun, 10 Jan 2016 16:03:18 -0800
From:	Dan Williams <dan.j.williams@...el.com>
To:	Jerry Hoemann <jerry.hoemann@....com>
Cc:	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <lenb@...nel.org>,
	"Elliott, Robert (Persistent Memory)" <elliott@....com>,
	jmoyer <jmoyer@...hat.com>,
	Dmitry Krivenok <krivenok.dmitry@...il.com>,
	Linda Knippers <linda.knippers@....com>,
	Robert Moore <robert.moore@...el.com>,
	Lv Zheng <lv.zheng@...el.com>,
	Rafael J Wysocki <rafael.j.wysocki@...el.com>,
	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
	Linux ACPI <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 0/6] nvdimm: Add an IOCTL pass thru for DSM calls

On Wed, Jan 6, 2016 at 3:58 PM, Dan Williams <dan.j.williams@...el.com>wrote:
> On Wed, Jan 6, 2016 at 3:03 PM, Jerry Hoemann <jerry.hoemann@....com> wrote:
[..]
>> Jerry Hoemann (6):
>>   ACPI / util: Fix acpi_evaluate_dsm() argument type
>>   nvdimm: Clean-up access mode check.
>>   nvdimm: Add wrapper for IOCTL pass thru
>>   nvdimm: Fix security issue with DSM IOCTL.
>>   nvdimm: Increase max envelope size for IOCTL
>>   nvdimm: Add IOCTL pass thru functions
>
> These look good to me.
>
> I'll tag "nvdimm: Fix security issue with DSM IOCTL." for -stable.
>
> Thanks Jerry!

I went to go write a test / support in ndctl for these and noticed a
few things I want to address before merging.

1/ Advertise 'call_dsm' as a supported command alongside the others.

2/ Disallow potentially invalid calls to reach firmware.  At a minimum
the kernel needs to know the uuid in advance for any dsm it wants to
send.  I.e. check the 'dsm_fun_idx' against the dsm_mask.  This is
also important for making sure the kernel can manage exclusive access
to the configuration data area if present
(ND_CMD_{GET|SET}_CONFIG_DATA).

3/ This is minor, but it follows from 1/ that there may be some nvdimm
bus implementations that do not implement 'call_dsm' support.
'nfit_test' is currently one of those buses and we need to check for
that explicitly in nd_ioctl.

I have some patches in progress to address these.