linux-kernel - Re: [PATCH 1/4] pkeys: add API to switch to permissive pkey register

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Message-ID: <feefc184-d0eb-4eb9-a495-b7ea6774208c@intel.com>
Date: Wed, 26 Feb 2025 09:21:39 -0800
From: Dave Hansen <dave.hansen@...el.com>
To: Dmitry Vyukov <dvyukov@...gle.com>
Cc: mathieu.desnoyers@...icios.com, peterz@...radead.org,
 boqun.feng@...il.com, tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
 dave.hansen@...ux.intel.com, hpa@...or.com, aruna.ramakrishna@...cle.com,
 elver@...gle.com, "Paul E. McKenney" <paulmck@...nel.org>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] pkeys: add API to switch to permissive pkey register

On 2/26/25 02:00, Dmitry Vyukov wrote:
>> We could typedef it to some fake struct. Such a struct can't be passed
>> to any function accepting an integer type (real pkeys), and any
>> arithmetic won't work on it.
> Dave, how should we proceed? Do you think this is a potential misuse
> worth preventing proactively? If yes, I can send v7.

I don't think it's worth doing anything too weird. Defining some kind of
special struct would be pretty weird.