Re: [PATCH] crypto: drbg: fix crypto api abuse

Hi,

On Sun, Feb 27, 2022 at 12:12 PM Gilad Ben-Yossef gilad@benyossef.com wrote: ...

I think the right thing to do right now is to verify that we indeed have a general issue and not something specific to one singular platform So the question becomes - do indeed the DMA api forbits aliased mappings and if so, under what conditions?

Any ideas on how to check this?

OK, I've looked into this further and I think I was wrong. The DMA api doesn't like overlapping writable mappings, but it seems an overlapping read-only and writable mapping are fine. If so I can indeed resolve this in the driver code by better specifying DMA direction. Let me give this a go and let's drop this patch in the meantime.

Thank you and sorry for the noise.

Gilad