Re: Patch "rust: dma: use pointer projection infra for `dma_{read,write}` macro" has been added to the 6.19-stable tree

["Danilo Krummrich" <dakr@kernel.org>]

On Mon Mar 16, 2026 at 3:00 PM CET, Greg KH wrote:
> On Sun, Mar 15, 2026 at 02:48:52PM +0000, Gary Guo wrote:
>> On Sun Mar 15, 2026 at 2:40 PM GMT, Sasha Levin wrote:
>> > This is a note to let you know that I've just added the patch titled
>> >
>> >     rust: dma: use pointer projection infra for `dma_{read,write}` macro
>> >
>> > to the 6.19-stable tree which can be found at:
>> >     http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
>> >
>> > The filename of the patch is:
>> >      rust-dma-use-pointer-projection-infra-for-dma_-read-.patch
>> > and it can be found in the queue-6.19 subdirectory.
>> 
>> Hi Sasha,
>> 
>> commit 08da98f18f4f ("rust: ptr: add `KnownSize` trait to support DST size info
>> extraction") and commit f41941aab3ac ("rust: ptr: add projection
>> infrastructure") are dependencies of this fix.
>> 
>> It doesn't look like these commits are currently being picked. They're needed
>> for building.
>> 
>> They're part of the same series: https://lore.kernel.org/rust-for-linux/20260302164239.284084-1-gary@kernel.org/
>
> Yeah, this breaks the build on my systems.  I'll go drop this patch for
> now, and if you want these in the stable trees, can you provide a
> backported series of them?

The DMA soundness fix, as a potential bug, is probably not crucial to backport.

There are two nova-core fixes on top of it. One of them fixes a UB condition
reading from and writing to a DMA buffer, the other one is a potential stack
overflow.

nova-core is still work in progress, so I'm not too worried about this as far as
stable trees are concerned.

I think we usually backport soundness fixes anyway, plus everything should apply
without conflicts, so it probably doesn't hurt to pick them up regardless.

I can send a separate series if preferred.