linux-kernel - Re: [PATCH] tty: fix data race in tty_buffer

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Message-ID: <20150908221123.GA22446@kroah.com>
Date:	Tue, 8 Sep 2015 15:11:23 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Dmitry Vyukov <dvyukov@...gle.com>
Cc:	peter@...leysoftware.com, jslaby@...e.com,
	linux-kernel@...r.kernel.org, jslaby@...e.cz,
	andreyknvl@...gle.com, kcc@...gle.com, glider@...gle.com,
	paulmck@...ux.vnet.ibm.com, hboehm@...gle.com
Subject: Re: [PATCH] tty: fix data race in tty_buffer_flush

On Tue, Sep 08, 2015 at 02:48:26PM +0200, Dmitry Vyukov wrote:
> tty_buffer_flush frees not acquired buffers.
> As the result, for example, read of b->size in tty_buffer_free
> can return garbage value which will lead to a huge buffer
> hanging in the freelist. This is just the benignest
> manifestation of freeing of a not acquired object.
> If the object is passed to kfree, heap can be corrupted.
> 
> Acquire visibility over the buffer before freeing it.
> 
> The data race was found with KernelThreadSanitizer (KTSAN).
> 
> Signed-off-by: Dmitry Vyukov <dvyukov@...gle.com>
> ---
>  drivers/tty/tty_buffer.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)

What changed from the last version?  Why should I take this one and not
the other?  What order do these go in?

Please please please version your patches, and number them in a series
so that I know what to apply, and in what order, and what changed
between versions.  Please read Documentation/SubmittingPatches for all
the details about this.

I've now dropped all of your patches from my queue, please resend them
all properly.

thanks,

greg k-h
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