# Re: \[RFC\]\[PATCH v2 06/12\] diglim: Interfaces - digest\_list\_add, digest\_list\_del

- From: Mimi Zohar \<zohar@linux.ibm.com\>
- Date: 2021-07-30 14:03:43 
- List: linux-security-module
- Page: https://ratatoskr.run/linux-security-module/2021/07/1463274
- Thread: https://ratatoskr.run/linux-integrity/2021/07/1458516/t.md

```text
Hi Roberto,

On Fri, 2021-07-30 at 13:16 +0000, Roberto Sassu wrote:
> > From: Mimi Zohar [mailto:zohar@linux.ibm.com]
> > Sent: Friday, July 30, 2021 2:40 PM

> > "critical data", in this context, should probably be used for verifying
> > the in memory file digests and other state information haven't been
> > compromised.
> 
> Actually, this is what we are doing currently. To keep the
> implementation simple, once the file or the buffer are uploaded
> to the kernel, they will not be modified, just accessed through
> the indexes.

My main concern about digest lists is their integrity, from loading the
digest lists to their being stored in memory.  A while back, there was
some work on defining a write once memory allocator.  I don't recall
whatever happened to it.  This would be a perfect usecase for that
memory allocator.

thanks,

Mimi

```