linux-kernel - Re: [PATCH v2] arm64/gcs: Fix error handling in arch_set_shadow_stack

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Message-ID: <177011102209.2472980.4751215527771350608.b4-ty@kernel.org>
Date: Tue,  3 Feb 2026 20:29:01 +0000
From: Will Deacon <will@...nel.org>
To: Catalin Marinas <catalin.marinas@....com>,
	Thiago Jung Bauermann <thiago.bauermann@...aro.org>,
	Mark Brown <broonie@...nel.org>,
	Breno Leitao <leitao@...ian.org>
Cc: kernel-team@...roid.com,
	Will Deacon <will@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	kernel-team@...a.com
Subject: Re: [PATCH v2] arm64/gcs: Fix error handling in arch_set_shadow_stack_status()

On Mon, 02 Feb 2026 10:32:51 -0800, Breno Leitao wrote:
> alloc_gcs() returns an error-encoded pointer on failure, which comes
> from do_mmap(), not NULL.
> 
> The current NULL check fails to detect errors, which could lead to using
> an invalid GCS address.
> 
> Use IS_ERR_VALUE() to properly detect errors, consistent with the
> check in gcs_alloc_thread_stack().
> 
> [...]

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

[1/1] arm64/gcs: Fix error handling in arch_set_shadow_stack_status()
      https://git.kernel.org/arm64/c/53c998527ffa

Cheers,
-- 
Will

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