From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chien Tin Tung Subject: Re: [PATCH][V2] RDMA/nes: do not leak uninitialized resp.reserved to userspace Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Date: Tue, 5 Sep 2017 09:40:41 -0500 Message-ID: <20170905144041.GA13068@ctung-MOBL3.amr.corp.intel.com> References: <20170904133705.3980-1-colin.king@canonical.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20170904133705.3980-1-colin.king-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org> Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Colin King Cc: Faisal Latif , Doug Ledford , Sean Hefty , Hal Rosenstock , linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, kernel-janitors-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, stable-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-rdma@vger.kernel.org On Mon, Sep 04, 2017 at 02:37:05PM +0100, Colin King wrote: > From: Colin Ian King > > 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 -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html