linux-kernel - Re: [PATCH v3 3/4] uaccess: Check no rescheduling function is called in unsafe region

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Message-ID: <20190213150819.GP32534@hirez.programming.kicks-ass.net>
Date:   Wed, 13 Feb 2019 16:08:19 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Julien Thierry <julien.thierry@....com>
Cc:     Will Deacon <will.deacon@....com>, Ingo Molnar <mingo@...nel.org>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        mingo@...hat.com, catalin.marinas@....com, james.morse@....com,
        hpa@...or.com, valentin.schneider@....com
Subject: Re: [PATCH v3 3/4] uaccess: Check no rescheduling function is called
 in unsafe region

On Wed, Feb 13, 2019 at 03:40:00PM +0100, Peter Zijlstra wrote:

> So far, all 6 in-tree users are indeed free of dodgy code, but *groan*.

because of this, there must also not be tracepoints (even implicit ones
like function-trace) between user_access_{begin,end}().

And while that is unlikely with the current code; it is not guaranteed
afaict.

What a ff'ing mess.