From: Sudeep Holla <sudeep.holla@arm.com>
To: Beata Michalska <beata.michalska@arm.com>
Cc: <linux-kernel@vger.kernel.org>,
<linux-arm-kernel@lists.infradead.org>, <ionela.voinescu@arm.com>,
<will@kernel.org>, <catalin.marinas@arm.com>, <sumitg@nvidia.com>,
<ptsm@linux.microsoft.com>
Subject: Re: [PATCH] arm64: amu: Delay allocating cpumask for AMU FIE support
Date: Fri, 31 Jan 2025 16:34:39 +0000 [thread overview]
Message-ID: <Z5z7nws-_7VEe_d-@bogus> (raw)
In-Reply-To: <20250131155842.3839098-1-beata.michalska@arm.com>
On Fri, Jan 31, 2025 at 03:58:42PM +0000, Beata Michalska wrote:
> For the time being, the amu_fie_cpus cpumask is being exclusively used
> by the AMU-related internals of FIE support and is guaranteed to be
> valid on every access currently made. Still the mask is not being
> invalidated on one of the error handling code paths, which leaves
> a soft spot with theoretical risk of UAF for CPUMASK_OFFSTACK cases.
> To make things sound, delay allocating said cpumask
> (for CPUMASK_OFFSTACK) avoiding otherwise nasty sanitising case failing
> to register the cpufreq policy notifications.
>
I thought I had provided my tag, sorry for that. FWIW,
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
--
Regards,
Sudeep
next prev parent reply other threads:[~2025-01-31 16:42 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-01-31 15:58 [PATCH] arm64: amu: Delay allocating cpumask for AMU FIE support Beata Michalska
2025-01-31 16:34 ` Sudeep Holla [this message]
2025-02-13 13:59 ` Will Deacon
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