linux-kernel - Re: [PATCH v9 05/22] x86/cea: Use array indexing to simplify exception stack access

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Message-ID: <20260130134211.GTaXy1M4oB2R7rvTfF@fat_crate.local>
Date: Fri, 30 Jan 2026 14:42:11 +0100
From: Borislav Petkov <bp@...en8.de>
To: "Xin Li (Intel)" <xin@...or.com>
Cc: linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	linux-doc@...r.kernel.org, pbonzini@...hat.com, seanjc@...gle.com,
	corbet@....net, tglx@...utronix.de, mingo@...hat.com,
	dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
	luto@...nel.org, peterz@...radead.org, andrew.cooper3@...rix.com,
	chao.gao@...el.com, hch@...radead.org, sohil.mehta@...el.com
Subject: Re: [PATCH v9 05/22] x86/cea: Use array indexing to simplify
 exception stack access

On Sun, Oct 26, 2025 at 01:18:53PM -0700, Xin Li (Intel) wrote:
> +noinstr unsigned long __this_cpu_ist_top_va(enum exception_stack_ordering stack)
> +{

You better check this @stack is within the array bounds of event_stacks[].

> +	return __this_cpu_ist_bottom_va(stack) + EXCEPTION_STKSZ;
> +}

-- 
Regards/Gruss,
    Boris.

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