linux-kernel - Re: [PATCH RFC/RFT 2/3] mm: helper `is_shadow_stack

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Message-ID: <ZwkAO9P3CxGbyq4L@finisterre.sirena.org.uk>
Date: Fri, 11 Oct 2024 11:38:51 +0100
From: Mark Brown <broonie@...nel.org>
To: Deepak Gupta <debug@...osinc.com>
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
	linux-arch@...r.kernel.org,
	Rick Edgecombe <rick.p.edgecombe@...el.com>
Subject: Re: [PATCH RFC/RFT 2/3] mm: helper `is_shadow_stack_vma` to check
 shadow stack vma

On Thu, Oct 10, 2024 at 05:32:04PM -0700, Deepak Gupta wrote:
> VM_SHADOW_STACK (alias to VM_HIGH_ARCH_5) is used to encode shadow stack
> VMA on three architectures (x86 shadow stack, arm GCS and RISC-V shadow
> stack). In case architecture doesn't implement shadow stack, it's VM_NONE
> Introducing a helper `is_shadow_stack_vma` to determine shadow stack vma
> or not.
> 
> Signed-off-by: Deepak Gupta <debug@...osinc.com>
> ---
>  mm/gup.c |  2 +-
>  mm/vma.h | 10 +++++++---
>  2 files changed, 8 insertions(+), 4 deletions(-)

As I noted in reply to the version of this patch in the RISC-V series
there's another test for VM_SHADOW_STACK in mm/mmap.c.

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