linux-kernel - Re: A potential race in drivers/staging/speakup/speakup.ko

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Date:   Mon, 5 Sep 2016 11:43:17 +0200
From:   Samuel Thibault <samuel.thibault@...-lyon.org>
To:     Pavel Andrianov <andrianov@...ras.ru>
Cc:     William Hubbs <w.d.hubbs@...il.com>,
        Chris Brannon <chris@...-brannons.com>,
        Kirk Reiser <kirk@...sers.ca>, speakup@...ux-speakup.org,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        Vaishali Thakkar <vaishali.thakkar@...cle.com>,
        ldv-project@...uxtesting.org
Subject: Re: A potential race in drivers/staging/speakup/speakup.ko

Hello,

Pavel Andrianov, on Mon 05 Sep 2016 11:51:50 +0300, wrote:
> There is a potential race in drivers/staging/speakup/speakup.ko.
> All operations with global pointers buff_in and buff_out are performed
> without any locks. Thus, a simultaneous write (via synth_buffer_clear or
> synth_buffer_add) to the pointers may lead to inconsistent data.
> 
> Should a local lock be used here?

AIUI, all callers of these functions have speakup_info.spinlock held.

Samuel