From: Greg KH <gregkh@linuxfoundation.org>
To: Youquan Song <youquan.song@intel.com>
Cc: dan.j.williams@intel.com, vinod.koul@intel.com,
andriy.shevchenko@intel.com, mika.westerberg@intel.com,
linux-kernel@vger.kernel.org,
Youquan Song <youquan.song@linux.intel.com>
Subject: Re: [PATCH 2/2] dma: calculate the data tranferred by 8250
Date: Fri, 11 Oct 2013 06:32:00 -0700 [thread overview]
Message-ID: <20131011133200.GA32689@kroah.com> (raw)
In-Reply-To: <1381527738-9339-3-git-send-email-youquan.song@intel.com>
On Fri, Oct 11, 2013 at 05:42:18PM -0400, Youquan Song wrote:
> When using UART transfers data by DMA mode, but it always shows 0 at
> /sys/class/dma/dma0chan*/bytes_transferred.
>
> Call the new function to calculate how many the data has been transferred
> after doing it by DMA mode.
How nice, you just leaked to userspace the size of passwords and other
sensitive things typed into a serial console :(
No, we can't do this, we fixed up this problem in other places we leaked
the transmition of serial data through proc and sysfs files, let's not
add new ones and go backwards in security.
Sorry, we can't do this, and I really doubt that it matters.
greg k-h
prev parent reply other threads:[~2013-10-11 13:33 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-10-11 21:42 DMA: Calculate how many data transferred by DMA Youquan Song
2013-10-11 21:42 ` [PATCH 1/2] dma: Add interface to calculate data transferred Youquan Song
2013-10-11 10:22 ` Shevchenko, Andriy
2013-10-11 13:33 ` Greg KH
2013-10-13 15:26 ` Vinod Koul
2013-10-15 18:31 ` Youquan Song
2013-10-15 15:30 ` Greg KH
2013-10-15 15:55 ` Dan Williams
2013-10-15 16:17 ` Greg KH
2013-10-16 5:38 ` Vinod Koul
2013-10-16 8:36 ` Shevchenko, Andriy
2013-10-16 7:57 ` Vinod Koul
2013-10-16 9:13 ` Shevchenko, Andriy
2013-10-16 14:12 ` Greg KH
2013-10-16 15:07 ` Vinod Koul
2013-10-16 18:17 ` Dan Williams
2013-10-11 21:42 ` [PATCH 2/2] dma: calculate the data tranferred by 8250 Youquan Song
2013-10-11 13:32 ` Greg KH [this message]
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