On Tue, Dec 13, 2016 at 9:05 AM, Al Viro <viro@xxxxxxxxxxxxxxxxxx> wrote:
>
> I really doubt it - there might be something subtle I'd missed, but AFAICS
> it is vulnerable to the scenario above.
Hmm. So maybe just add
if (segment_eq(get_fs(), KERNEL_DS))
return -EINVAL;
to blk_rq_map_user_iov()?
Linus
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