linux-kernel - Re: [PATCH] arm64: efi: Fix KASAN false positive for EFI runtime stack

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Message-ID: <aGfZwTCNO_10Ceng@J2N7QTR9R3>
Date: Fri, 4 Jul 2025 14:40:17 +0100
From: Mark Rutland <mark.rutland@....com>
To: Will Deacon <will@...nel.org>
Cc: Breno Leitao <leitao@...ian.org>, Ard Biesheuvel <ardb@...nel.org>,
	Catalin Marinas <catalin.marinas@....com>, usamaarif642@...il.com,
	rmikey@...a.com, andreyknvl@...il.com, kasan-dev@...glegroups.com,
	linux-efi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, kernel-team@...a.com
Subject: Re: [PATCH] arm64: efi: Fix KASAN false positive for EFI runtime
 stack

On Fri, Jul 04, 2025 at 02:33:35PM +0100, Will Deacon wrote:
> I would actually like to select VMAP_STACK unconditionally for arm64.
> Historically, we were held back waiting for all the various KASAN modes
> to support vmalloc properly, but I _think_ that's fixed now...
> 
> The VMAP_STACK dependency is:
> 
> 	depends on !KASAN || KASAN_HW_TAGS || KASAN_VMALLOC
> 
> and in arm64 we have:
> 
> 	select KASAN_VMALLOC if KASAN
> 
> so it should be fine to select it afaict.
> 
> Any reason not to do that?

Not that I am aware of.

I'm also in favour of unconditionally selecting VMAP_STACK.

Mark.