[PATCH 0/4] arm64: ptrace: fix handling of partial SETREGSET calls

[Mark Brown]

On Thu, Dec 05, 2024 at 12:16:51PM +0000, Mark Rutland wrote:
> A few of arm64's regsets forget to handle partial-length SETREGSET
> calls, and copy a small portion of uninitialized kernel stack memory to
> the backing storage of the relevant registers. In all cases the read is
> limited to a specific slot on the stack, and the issue does not provide
> a write mechanism.

It feels like we might want a helpers specifically for the case where
we're mapping a value directly into a data structure, it all feels a bit
open coding.  The shape is a bit awkward though since things aren't
usually stored in the same layout as we expose via ptrace when there's
more than one value.

Reviewed-by: Mark Brown <broonie at kernel.org>
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