Hi Raghu,

On 4/3/20 1:38 AM, Raghu Krishnamurthy via TF-A wrote:

Thanks Sandrine. Patches look good.

Thanks for the review!

I realized after looking at things a little closer that i had misunderstood how fconf works for io policies. I thought the image id's themselves came from the config files and not just the UUID's, which is why i was worried about bounds check, since the id was coming from an external source(trusted or untrusted, depending on if it is signed data or not). This also made me realize that we are using another table built into code, to convert from image id to UUID for io policies. Is there a reason image id's also can't be discovered from the config file?

I remember some internal discussions around this topic a few weeks ago. If I recall correctly, the current thinking is that down the line, we would like to move image IDs to DTBs but this looks complicated to achieve today because image IDs are used by several components in TF-A to tie things together. More work would be needed to abstract this properly everywhere.

I think other folks in the team (Olivier? Manish? Louis?) might be able to comment further on this.

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