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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()
Date: Wed, 15 Jul 2026 11:14:14 -0600 (MDT)	[thread overview]
Message-ID: <35b94b17-2a2f-ae20-1156-e06c8de297cc@kernel.org> (raw)
In-Reply-To: <20260714003056.73707-1-mark.hsj@gmail.com>

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

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WARNING: multiple messages have this Message-ID (diff)
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()
Date: Wed, 15 Jul 2026 11:14:14 -0600 (MDT)	[thread overview]
Message-ID: <35b94b17-2a2f-ae20-1156-e06c8de297cc@kernel.org> (raw)
In-Reply-To: <20260714003056.73707-1-mark.hsj@gmail.com>

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

  reply	other threads:[~2026-07-15 17:14 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-07-14  0:30 [PATCH v2] riscv: hwprobe: Avoid uninitialized read in hwprobe_get_cpus() Mark Harris
2026-07-14  0:30 ` Mark Harris
2026-07-15 17:14 ` Paul Walmsley [this message]
2026-07-15 17:14   ` Paul Walmsley

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