linux-kernel - Re: [PATCH v2] arm64: mops: Do not dereference src reg for a set operation

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Message-Id: <174319246799.4193737.16793512862638162147.b4-ty@arm.com>
Date: Fri, 28 Mar 2025 20:07:55 +0000
From: Catalin Marinas <catalin.marinas@....com>
To: linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Keir Fraser <keirf@...gle.com>
Cc: Will Deacon <will@...nel.org>,
	Kristina Martsenko <kristina.martsenko@....com>,
	Mark Rutland <mark.rutland@....com>,
	stable@...r.kernel.org,
	Marc Zyngier <maz@...nel.org>
Subject: Re: [PATCH v2] arm64: mops: Do not dereference src reg for a set operation

On Wed, 26 Mar 2025 11:04:47 +0000, Keir Fraser wrote:
> The source register is not used for SET* and reading it can result in
> a UBSAN out-of-bounds array access error, specifically when the MOPS
> exception is taken from a SET* sequence with XZR (reg 31) as the
> source. Architecturally this is the only case where a src/dst/size
> field in the ESR can be reported as 31.
> 
> Prior to 2de451a329cf662b the code in do_el0_mops() was benign as the
> use of pt_regs_read_reg() prevented the out-of-bounds access.
> 
> [...]

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

[1/1] arm64: mops: Do not dereference src reg for a set operation
      https://git.kernel.org/arm64/c/a13bfa4fe0d6

-- 
Catalin