linux-kernel - Re: [PATCH] arm64: amu: Delay allocating cpumask for AMU FIE support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <Z5z7nws-_7VEe_d-@bogus>
Date: Fri, 31 Jan 2025 16:34:39 +0000
From: Sudeep Holla <sudeep.holla@....com>
To: Beata Michalska <beata.michalska@....com>
Cc: <linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<ionela.voinescu@....com>, <will@...nel.org>,
	<catalin.marinas@....com>, <sumitg@...dia.com>,
	<ptsm@...ux.microsoft.com>
Subject: Re: [PATCH] arm64: amu: Delay allocating cpumask for AMU FIE support

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@....com>

-- 
Regards,
Sudeep