linux-kernel - Re: [PATCH v2 1/3] nvmem: core: make default user binary file root-access only

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Message-ID: <20151007113349.GJ21513@n2100.arm.linux.org.uk>
Date:	Wed, 7 Oct 2015 12:33:49 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:	gregkh@...uxfoundation.org, stefan.wahren@...e.com, andrew@...n.ch,
	s.hauer@...gutronix.de, pantelis.antoniou@...sulko.com,
	linux-kernel@...r.kernel.org, maitysanchayan@...il.com,
	p.zabel@...gutronix.de, maxime.ripard@...e-electrons.com,
	linux-arm-kernel@...ts.infradead.org, wxt@...k-chips.com
Subject: Re: [PATCH v2 1/3] nvmem: core: make default user binary file
 root-access only

On Wed, Oct 07, 2015 at 12:00:47PM +0100, Srinivas Kandagatla wrote:
> As required by many providers like at24/at25/mxs-ocotp/qfprom and may be
> other providers would want to allow root-only to read the nvmem content.
> So making the defaults to be root-only access would address the request
> and also provide flexibility to providers to specify there own permissions
> on top of the root-only using the perm flag in nvmem_config.
> Making this dynamic did cut down lot of static binary attributes in the
> code.

Check what the lifetime of a struct bin_attribute is before you embed it
into any other structure.  Sorry, but I think you're going to have to
read up on the driver model, sysfs, and kernfs implementations to find
out - I don't know the answer to this without doing the same.

However, this is basic checking that anyone should do when embedding
a structure within another.

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