linux-kernel - Re: [PATCH] sched/mmcid: Don't assume CID is CPU owned on mode switch

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Message-ID: <38368f67-c5e4-495c-bc07-f18aac985c0a@efficios.com>
Date: Tue, 10 Feb 2026 11:28:17 -0500
From: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To: Thomas Gleixner <tglx@...nel.org>,
 Shinichiro Kawasaki <shinichiro.kawasaki@....com>,
 Linus Torvalds <torvalds@...ux-foundation.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
 Ihor Solodrai <ihor.solodrai@...ux.dev>,
 Shrikanth Hegde <sshegde@...ux.ibm.com>,
 Peter Zijlstra <peterz@...radead.org>,
 Michael Jeanson <mjeanson@...icios.com>,
 Andrey Ryabinin <ryabinin.a.a@...il.com>,
 Alexander Potapenko <glider@...gle.com>,
 "kasan-dev@...glegroups.com" <kasan-dev@...glegroups.com>
Subject: Re: [PATCH] sched/mmcid: Don't assume CID is CPU owned on mode switch

On 2026-02-10 11:20, Thomas Gleixner wrote:
> Shinichiro reported a KASAN UAF, which is actually an out of bounds access
> in the MMCID management code.
[...]
> 
> Fixes: 007d84287c74 ("sched/mmcid: Drop per CPU CID immediately when switching to per task mode")
> Reported-by: Shinichiro Kawasaki <shinichiro.kawasaki@....com>
> Signed-off-by: Thomas Gleixner <tglx@...nel.org>
> Tested-by: Shinichiro Kawasaki <shinichiro.kawasaki@....com>
> Cc: stable@...r.kernel.org
> Closes: https://lore.kernel.org/aYsZrixn9b6s_2zL@shinmob
> ---
> 
> Linus, can you please take that directly?

Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>

-- 
Mathieu Desnoyers
EfficiOS Inc.
https://www.efficios.com