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From: Thomas Gleixner <tglx@kernel.org>
To: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>, =?utf-8?Q?Andr?=
 =?utf-8?Q?=C3=A9?= Almeida
 <andrealmeid@igalia.com>
Cc: linux-kernel@vger.kernel.org, Carlos O'Donell <carlos@redhat.com>,
 Sebastian Andrzej Siewior <bigeasy@linutronix.de>, Peter Zijlstra
 <peterz@infradead.org>, Florian Weimer <fweimer@redhat.com>, Rich Felker
 <dalias@aerifal.cx>, Torvald Riegel <triegel@redhat.com>, Darren Hart
 <dvhart@infradead.org>, Ingo Molnar <mingo@redhat.com>, Davidlohr Bueso
 <dave@stgolabs.net>, Arnd Bergmann <arnd@arndb.de>, "Liam R . Howlett"
 <Liam.Howlett@oracle.com>
Subject: Re: [RFC PATCH] futex: Introduce __vdso_robust_futex_unlock
In-Reply-To: <a2c29bb7-d0af-4d5f-8858-ead460979cd9@efficios.com>
References: <20260311185409.1988269-1-mathieu.desnoyers@efficios.com>
 <87eclopu0j.ffs@tglx> <b91a3ad3-7d87-4eb2-9664-652f809f047f@efficios.com>
 <874imfpukd.ffs@tglx> <a2c29bb7-d0af-4d5f-8858-ead460979cd9@efficios.com>
Date: Mon, 16 Mar 2026 21:27:43 +0100
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On Mon, Mar 16 2026 at 15:36, Mathieu Desnoyers wrote:
> On 2026-03-16 13:12, Thomas Gleixner wrote:
>>     sys_exit() is different because there a task voluntarily exits and if
>>     it does so between the unlock and the clearing of the op pointer,
>>     then so be it. That'd be wilfull ignorance or malice and not any
>>     different from the task doing the corruption itself in user space
>>     right away.
>
> I'm not sure about this one. How about the two following scenario:
> A concurrent thread calls sys_exit concurrently with the vdso. Is this
> something we should handle or consider it "wilfull ignorance/malice" ?

I don't understand your question. What has the exit to do with the VDSO?