linux-kernel - Re: [PATCH v3 21/36] arm64/mm: Implement map_shadow

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Message-ID: <1237441e-3e1a-4682-b3bf-face931640d3@sirena.org.uk>
Date:   Tue, 1 Aug 2023 19:03:31 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Mike Rapoport <rppt@...nel.org>
Cc:     "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>,
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Subject: Re: [PATCH v3 21/36] arm64/mm: Implement map_shadow_stack()

On Tue, Aug 01, 2023 at 08:28:14PM +0300, Mike Rapoport wrote:
> On Tue, Aug 01, 2023 at 05:07:00PM +0000, Edgecombe, Rick P wrote:

> > So the question is not what mode should arm support, but should we have
> > the flags match between x86 and ARM?

> What if the flag will be called, say, SHADOW_STACK_DEFAULT_INIT?
> Then each arch can push whatever it likes to and from the userspace
> perspective the shadow stack will have some basic init state, no matter
> what architecture it is.

x86 might have some fun with that and the existing userspace binaries...

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