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Date: Wed, 15 Jul 2026 11:14:14 -0600 (MDT)
From: Paul Walmsley <pjw@kernel.org>
To: Mark Harris <mark.hsj@gmail.com>
cc: Paul Walmsley <pjw@kernel.org>, Palmer Dabbelt <palmer@dabbelt.com>, 
    Albert Ou <aou@eecs.berkeley.edu>, Alexandre Ghiti <alex@ghiti.fr>, 
    Nam Cao <namcao@linutronix.de>, Michael Ellerman <mpe@kernel.org>, 
    linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] riscv: hwprobe: Avoid uninitialized read in
 hwprobe_get_cpus()
In-Reply-To: <20260714003056.73707-1-mark.hsj@gmail.com>
Message-ID: <35b94b17-2a2f-ae20-1156-e06c8de297cc@kernel.org>
References: <20260714003056.73707-1-mark.hsj@gmail.com>
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On Mon, 13 Jul 2026, Mark Harris wrote:

> When cpusetsize < cpumask_size(), hwprobe_get_cpus() did not fully
> initialize its copy of the cpu mask, which could cause non-deterministic
> results from the riscv_hwprobe syscall on a system with more than 8 CPUs
> when the supplied cpu mask is empty.  Address this by fully initializing
> the cpu mask.
> 
> Fixes: e178bf146e4b ("RISC-V: hwprobe: Introduce which-cpus flag")
> Signed-off-by: Mark Harris <mark.hsj@gmail.com>
> Reviewed-by: Nam Cao <namcao@linutronix.de>
> Reviewed-by: Michael Ellerman <mpe@kernel.org>

Thanks, queued for v7.2-rc.


- Paul