linux-kernel - [PATCH 3.16.y-ckt 068/133] IB/uverbs: reject invalid or unknown opcodes

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Message-Id: <1443606681-7124-69-git-send-email-luis.henriques@canonical.com>
Date:	Wed, 30 Sep 2015 10:50:16 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Christoph Hellwig <hch@....de>, Doug Ledford <dledford@...hat.com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 068/133] IB/uverbs: reject invalid or unknown opcodes

3.16.7-ckt18 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Christoph Hellwig <hch@....de>

commit b632ffa7cee439ba5dce3b3bc4a5cbe2b3e20133 upstream.

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.

Signed-off-by: Christoph Hellwig <hch@....de>
Reviewed-by: Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Reviewed-by: Sagi Grimberg <sagig@...lanox.com>
Signed-off-by: Doug Ledford <dledford@...hat.com>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/infiniband/core/uverbs_cmd.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
index 2adc14372b94..5e66eab292d8 100644
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -2111,6 +2111,12 @@ ssize_t ib_uverbs_post_send(struct ib_uverbs_file *file,
 		next->send_flags = user_wr->send_flags;
 
 		if (is_ud) {
+			if (next->opcode != IB_WR_SEND &&
+			    next->opcode != IB_WR_SEND_WITH_IMM) {
+				ret = -EINVAL;
+				goto out_put;
+			}
+
 			next->wr.ud.ah = idr_read_ah(user_wr->wr.ud.ah,
 						     file->ucontext);
 			if (!next->wr.ud.ah) {
@@ -2150,9 +2156,11 @@ ssize_t ib_uverbs_post_send(struct ib_uverbs_file *file,
 					user_wr->wr.atomic.compare_add;
 				next->wr.atomic.swap = user_wr->wr.atomic.swap;
 				next->wr.atomic.rkey = user_wr->wr.atomic.rkey;
+			case IB_WR_SEND:
 				break;
 			default:
-				break;
+				ret = -EINVAL;
+				goto out_put;
 			}
 		}
 
--
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