linux-kernel - Re: [PATCH v9 01/26] mm: helper `is_shadow_stack

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Message-ID: <Z6aM4NZyJSGLwIPr@debug.ba.rivosinc.com>
Date: Fri, 7 Feb 2025 14:44:48 -0800
From: Deepak Gupta <debug@...osinc.com>
To: Mark Brown <broonie@...nel.org>
Cc: Vlastimil Babka <vbabka@...e.cz>, 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>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
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Subject: Re: [PATCH v9 01/26] mm: helper `is_shadow_stack_vma` to check
 shadow stack vma

On Fri, Feb 07, 2025 at 08:06:59PM +0000, Mark Brown wrote:
>On Fri, Feb 07, 2025 at 10:27:10AM +0100, Vlastimil Babka wrote:
>> On 2/5/25 02:21, Deepak Gupta wrote:
>> > VM_SHADOW_STACK (alias to VM_HIGH_ARCH_5) is used to encode shadow stack
>
>> I see that arm GCS uses VM_HIGH_ARCH_6.
>
>That'll be bitrot in the changelog, it was originally VM_HIGH_ARCH_5 on
>arm64 as well but we had to renumber due to the addition of
>VM_MTE_ALLOWED while the GCS series was on the list.  The changelog just
>shouldn't mention VM_HIGH_ARCH_x, it's not particularly relevant here.

Yeah noted. Thanks.