linux-kernel - Re: [PATCH][next] sched/debug: fix memory corruption caused by multiple small reads of flags

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Message-ID: <20201110165401.GN2594@hirez.programming.kicks-ass.net>
Date:   Tue, 10 Nov 2020 17:54:01 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Colin King <colin.king@...onical.com>
Cc:     Ingo Molnar <mingo@...hat.com>, Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira <bristot@...hat.com>,
        Valentin Schneider <valentin.schneider@....com>,
        kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] sched/debug: fix memory corruption caused by
 multiple small reads of flags

On Thu, Oct 29, 2020 at 03:11:03PM +0000, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Reading /proc/sys/kernel/sched_domain/cpu*/domain0/flags mutliple times
> with small reads causes oopses with slub corruption issues because the kfree is
> free'ing an offset from a previous allocation. Fix this by adding in a new
> pointer 'buf' for the allocation and kfree and use the temporary pointer tmp
> to handle memory copies of the buf offsets.

Thanks!