[PATCH v2] drm/xe: Add bounds check on pat_index to prevent OOB kernel read in madvise

[Jia Yao <jia.yao@intel.com>]

When user provides a bogus pat_index value through the madvise IOCTL, the
xe_pat_index_get_coh_mode() function performs an array access without
validating bounds. This allows a malicious user to trigger an out-of-bounds
kernel read from the xe->pat.table array.

The vulnerability exists because the validation in madvise_args_are_sane()
directly calls xe_pat_index_get_coh_mode(xe, args->pat_index.val) without
first checking if pat_index is within [0, xe->pat.n_entries).

Although xe_pat_index_get_coh_mode() has a WARN_ON to catch this in debug
builds, it still performs the unsafe array access in production kernels.

v2(Matthew Auld)
- Using array_index_nospec() to mitigate spectre attacks when the value
is used

Fixes: ada7486c5668 ("drm/xe: Implement madvise ioctl for xe")
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Shuicheng Lin <shuicheng.lin@intel.com>
Cc: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Cc: "Thomas Hellström" <thomas.hellstrom@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Jia Yao <jia.yao@intel.com>
---
 drivers/gpu/drm/xe/xe_vm_madvise.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/xe/xe_vm_madvise.c b/drivers/gpu/drm/xe/xe_vm_madvise.c
index add9a6ca2390..3564e1442694 100644
--- a/drivers/gpu/drm/xe/xe_vm_madvise.c
+++ b/drivers/gpu/drm/xe/xe_vm_madvise.c
@@ -291,7 +291,12 @@ static bool madvise_args_are_sane(struct xe_device *xe, const struct drm_xe_madv
 		break;
 	case DRM_XE_MEM_RANGE_ATTR_PAT:
 	{
-		u16 coh_mode = xe_pat_index_get_coh_mode(xe, args->pat_index.val);
+		if (XE_IOCTL_DBG(xe, args->pat_index.val >= xe->pat.n_entries))
+			return false;
+
+		u16 pat_index = array_index_nospec(args->pat_index.val, xe->pat.n_entries);
+
+		u16 coh_mode = xe_pat_index_get_coh_mode(xe, pat_index);
 
 		if (XE_IOCTL_DBG(xe, !coh_mode))
 			return false;
-- 
2.43.0