linux-kernel - Re: [PATCH 10/11] scs: generic scs code updated to leverage hw assisted shadow stack

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Message-ID: <aIO05OZyhjZ5JADT@finisterre.sirena.org.uk>
Date: Fri, 25 Jul 2025 17:46:28 +0100
From: Mark Brown <broonie@...nel.org>
To: Sami Tolvanen <samitolvanen@...gle.com>
Cc: Deepak Gupta <debug@...osinc.com>, Will Deacon <will@...nel.org>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>,
	Masahiro Yamada <masahiroy@...nel.org>,
	Nathan Chancellor <nathan@...nel.org>,
	Nicolas Schier <nicolas.schier@...ux.dev>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Hildenbrand <david@...hat.com>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
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Subject: Re: [PATCH 10/11] scs: generic scs code updated to leverage hw
 assisted shadow stack

On Fri, Jul 25, 2025 at 04:13:27PM +0000, Sami Tolvanen wrote:
> On Thu, Jul 24, 2025 at 04:37:03PM -0700, Deepak Gupta wrote:

> > If shadow stack have memory protections from underlying cpu, use those
> > protections. arches can define PAGE_KERNEL_SHADOWSTACK to vmalloc such shadow
> > stack pages. Hw assisted shadow stack pages grow downwards like regular
> > stack. Clang based software shadow call stack grows low to high address.

> Is this the case for all the current hardware shadow stack
> implementations? If not, we might want a separate config for the
> shadow stack direction instead.

It's true for arm64.

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