linux-kernel - Re: [PATCH v4] iomap: fix WARN_ON

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Message-ID: <20200901052127.GA24560@infradead.org>
Date:   Tue, 1 Sep 2020 06:21:27 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Qian Cai <cai@....pw>
Cc:     darrick.wong@...cle.com, hch@...radead.org,
        linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] iomap: fix WARN_ON_ONCE() from unprivileged users

On Mon, Aug 31, 2020 at 02:23:53PM -0400, Qian Cai wrote:
> It is trivial to trigger a WARN_ON_ONCE(1) in iomap_dio_actor() by
> unprivileged users which would taint the kernel, or worse - panic if
> panic_on_warn or panic_on_taint is set. Hence, just convert it to
> pr_warn_ratelimited() to let users know their workloads are racing.
> Thank Dave Chinner for the initial analysis of the racing reproducers.
> 
> Signed-off-by: Qian Cai <cai@....pw>

Looks good,

Reviewed-by: Christoph Hellwig <hch@....de>