From de5372da605d3bca46e3102bab51b7e1c0e0a6f6 Mon Sep 17 00:00:00 2001
From: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
Date: Thu, 2 Aug 2018 22:40:19 -0500
Subject: [PATCH] drm/i915/kvmgt: Fix potential Spectre v1
Git-commit: de5372da605d3bca46e3102bab51b7e1c0e0a6f6
Patch-mainline: v4.19-rc1
References: bsc#1051510

info.index can be indirectly controlled by user-space, hence leading
to a potential exploitation of the Spectre variant 1 vulnerability.

This issue was detected with the help of Smatch:

drivers/gpu/drm/i915/gvt/kvmgt.c:1232 intel_vgpu_ioctl() warn:
potential spectre issue 'vgpu->vdev.region' [r]

Fix this by sanitizing info.index before indirectly using it to index
vgpu->vdev.region

Notice that given that speculation windows are large, the policy is
to kill the speculation on the first load and not worry if it can be
completed with a dependent load/store [1].

[1] https://marc.info/?l=linux-kernel&m=152449131114778&w=2

Cc: stable@vger.kernel.org
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/i915/gvt/kvmgt.c |    9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -43,6 +43,8 @@
 #include <linux/mdev.h>
 #include <linux/debugfs.h>
 
+#include <linux/nospec.h>
+
 #include "i915_drv.h"
 #include "gvt.h"
 
@@ -1139,7 +1141,8 @@ static long intel_vgpu_ioctl(struct mdev
 	} else if (cmd == VFIO_DEVICE_GET_REGION_INFO) {
 		struct vfio_region_info info;
 		struct vfio_info_cap caps = { .buf = NULL, .size = 0 };
-		int i, ret;
+		unsigned int i;
+		int ret;
 		struct vfio_region_info_cap_sparse_mmap *sparse = NULL;
 		size_t size;
 		int nr_areas = 1;
@@ -1224,6 +1227,10 @@ static long intel_vgpu_ioctl(struct mdev
 				if (info.index >= VFIO_PCI_NUM_REGIONS +
 						vgpu->vdev.num_regions)
 					return -EINVAL;
+				info.index =
+					array_index_nospec(info.index,
+							VFIO_PCI_NUM_REGIONS +
+							vgpu->vdev.num_regions);
 
 				i = info.index - VFIO_PCI_NUM_REGIONS;