On Thursday 14 February 2013 13:53:26 Bjørn Mork wrote:
> Do not scribble past end of buffer. Check if the userspace buffer has
> enough space available before attempting to move more data there. Throw
> away all previously read data if the buffer is full.
>
> Cc: stable <stable@vger.kernel.org>
> Signed-off-by: Bjørn Mork <bj...@mork.no>
> ---
> Hello Oliver!
>
> I hope I am missing something here...
>
> This is otherwise a pretty nasty bug which I cannot understand we
> didn't notice before. What am I missing?
Hi,
I am afraid your diagnosis is correct. This is a buffer overflow. Not good.
The fix is a problem. It seems to me that we need to throw away the
newest data and report an error.
Regards
Oliver
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