linux-kernel - Re: [PATCH v2] arm64: efi: Fix KASAN false positive for EFI runtime stack

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Message-Id: <175163682742.1322301.12219137975972256785.b4-ty@kernel.org>
Date: Fri,  4 Jul 2025 18:44:15 +0100
From: Will Deacon <will@...nel.org>
To: Catalin Marinas <catalin.marinas@....com>,
	Breno Leitao <leitao@...ian.org>
Cc: kernel-team@...roid.com,
	Will Deacon <will@...nel.org>,
	usamaarif642@...il.com,
	Ard Biesheuvel <ardb@...nel.org>,
	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,
	leo.yan@....com,
	kernel-team@...a.com,
	mark.rutland@....com
Subject: Re: [PATCH v2] arm64: efi: Fix KASAN false positive for EFI runtime stack

On Fri, 04 Jul 2025 05:47:07 -0700, Breno Leitao wrote:
> KASAN reports invalid accesses during arch_stack_walk() for EFI runtime
> services due to vmalloc tagging[1]. The EFI runtime stack must be allocated
> with KASAN tags reset to avoid false positives.
> 
> This patch uses arch_alloc_vmap_stack() instead of __vmalloc_node() for
> EFI stack allocation, which internally calls kasan_reset_tag()
> 
> [...]

Applied to arm64 (for-next/fixes), thanks!

[1/1] arm64: efi: Fix KASAN false positive for EFI runtime stack
      https://git.kernel.org/arm64/c/ef8923e6c051

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev