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From: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
To: Mimi Zohar <zohar@linux.ibm.com>, linux-integrity@vger.kernel.org
Cc: Tyler Hicks <tyhicks@linux.microsoft.com>
Subject: Measure data again even when it has not changed
Date: Wed, 29 Jul 2020 10:17:05 -0700	[thread overview]
Message-ID: <8bcf778d-8fa8-9985-43d7-c2b80d8d8445@linux.microsoft.com> (raw)

Hi Mimi,

I have a query related to measuring data (by IMA subsystem) when that 
data has been already been measured.

Consider the following sequence of events:

=> At time T0 IMA hook is called by another subsystem to measure data 
"foo". IMA measures it.

=> At time T1 data is "bar". IMA measures it.

=> At time T2 data is "foo" again. But IMA doesn't measure it since it 
is already in the measured list.

But for the subsystem making the call to IMA, the state has changed and 
"foo" has to be measured again.

One way to address the above is to use unique "event name" in each call 
so that IMA measures the given data every time.

Is there a better way to address the above?

thanks,
  -lakshmi


             reply	other threads:[~2020-07-29 17:17 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-29 17:17 Lakshmi Ramasubramanian [this message]
2020-07-30  3:23 ` Measure data again even when it has not changed Mimi Zohar
2020-07-30  3:41   ` Lakshmi Ramasubramanian
2020-07-30 12:05     ` Mimi Zohar
2020-07-30 13:12       ` Lakshmi Ramasubramanian
2020-07-30 14:05         ` Stephen Smalley

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