linux-kernel - Re: [PATCH 1/3] kcov: ensure irq code sees a valid area

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Message-ID: <20180504145626.gup5ytwt3uqt57xm@lakrids.cambridge.arm.com>
Date:   Fri, 4 May 2018 15:56:26 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     linux-kernel@...r.kernel.org
Cc:     akpm@...ux-foundation.org, aryabinin@...tuozzo.com,
        dvyukov@...gle.com, mingo@...hat.com, peterz@...radead.org
Subject: Re: [PATCH 1/3] kcov: ensure irq code sees a valid area

On Fri, May 04, 2018 at 02:55:33PM +0100, Mark Rutland wrote:
> In kcov_init_task() Since we update t->kcov_{mode,area,size} with plain
> stores, which may be re-ordered, torn, etc. Thus
> __sanitizer_cov_trace_pc() may see bogus values for any of these fields,
> and may attempt to write to memory which is not mapped.

Whoops; that 'Since' shuoldn't be there. I've fixed this up locally.

Mark.