Re: [PATCH 1/3] IB/uverbs: reject invalid or unknown opcodes

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On Wed, Aug 19, 2015 at 06:37:32PM +0200, Christoph Hellwig wrote:
> We have many WR opcodes that are only supported in kernel space
> and/or require optional information to be copied into the WR
> structure.  Reject all those not explicitly handled so that we
> can't pass invalid information to drivers.
> 
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
>  drivers/infiniband/core/uverbs_cmd.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)

Oh yes, this is absolutely needed for -stable.

Reviewed-by: Jason Gunthorpe <jgunthorpe@xxxxxxxxxxxxxxxxxxxx>

AFAIK, this path is rarely (never?) actually used. I think all the
drivers we have can post directly from userspace.

Jason
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