[PATCH v2 10/10] ima: use existing read file operation method to calculate file hash

On Wed, Jul 05, 2017 at 10:50:09AM -0400, Mimi Zohar wrote:

[Cc'ing linux-ima-users]

On Wed, 2017-06-28 at 16:41 +0200, Christoph Hellwig wrote:

quoted

NAK - we'll need an explicit method for the integrity code.

And just curious - what filesystem that you care about actually
implements ->read instead of ->read_iter?  We shouldn't be doing that
for real file systems anymore.

Right, pseudo filesystems are using ->read. The existing builtin
measurement policies exclude a number of pseudo filesystems, but not
efivarfs. ?Unfortunately, we do not know what type of custom policies
are currently being used.

efi variables contain information that may influence userspace behaviour 
and can also be modified out of band, so I think there's a reasonable 
argument that they should be measured.

-- 
Matthew Garrett | mjg59 at srcf.ucam.org
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