This commit should be included in all stable branches:
commit e6bd18f57aad1a2d1ef40e646d03ed0f2515c9e3
Author: Jason Gunthorpe <jgunthorpe@xxxxxxxxxxxxxxxxxxxx>
Date: Sun Apr 10 19:13:13 2016 -0600
IB/security: Restrict use of the write() interface
When backporting, please fold the following change to the ipath driver
into the patch.
Ben.
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
--- a/drivers/infiniband/hw/ipath/ipath_file_ops.c
+++ b/drivers/infiniband/hw/ipath/ipath_file_ops.c
@@ -44,6 +44,8 @@
#include <linux/cpu.h>
#include <asm/pgtable.h>
+#include <rdma/ib.h>
+
#include "ipath_kernel.h"
#include "ipath_common.h"
#include "ipath_user_sdma.h"
@@ -2239,6 +2241,9 @@ static ssize_t ipath_write(struct file *
ssize_t ret = 0;
void *dest;
+ if (WARN_ON_ONCE(!ib_safe_file_access(fp)))
+ return -EACCES;
+
if (count < sizeof(cmd.type)) {
ret = -EINVAL;
goto bail;
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