Re: [PATCH][V2] RDMA/nes: do not leak uninitialized resp.reserved to userspace Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit

[Chien Tin Tung]

On Mon, Sep 04, 2017 at 02:37:05PM +0100, Colin King wrote:
> From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
> 
> resp.reserved has not been initialized and so the copy_to_user (via
> ib_copy_to_udata) is copying uninitialized data from the stack back
> to user space which is a potential information leak. Fix this by
> initializing all of resp to zero.

Reserved field is not copied as the length of reserved is subtracted
from the size of resp and passed to ib_copy_to_udata.

 if (ib_copy_to_udata(udata, &resp, sizeof resp - sizeof resp.reserved)) {


This patch is not necessary.

Chien