Re: [PATCH] keys/encrypted: Fix two crypto-on-the-stack bugs

From: Joerg Roedel
Date: Wed Dec 14 2016 - 11:59:14 EST

On Tue, Dec 13, 2016 at 08:40:00AM -0800, Andy Lutomirski wrote:
> But I think this is rather silly. Joerg, Linus, etc: would it be okay
> to change lib/dma-debug.c to allow DMA *from* rodata?

Yeah, this would be fine for DMA_TO_DEVICE mappings. At least I can't
think of a reason right now to not allow it, in the end its also
read-only memory for the CPU, so it can be readable by devices too.
There is no danger of race conditions like on stacks or data leaks, as
there is only compile-time data in rodata.