Nvidia 340xx Patch

Author: Andreas Beckmann <anbe@debian.org>
Description: use kmem_cache_create_usercopy on 4.16+
 fixes "Bad or missing usercopy whitelist? Kernel memory exposure attempt
 detected from SLUB object 'nvidia_stack_cache'" on linux-image-4.16.0-2-*
 or newer that have disabled CONFIG_HARDENED_USERCOPY_FALLBACK
Bug-Debian: #901919, #899998
Bug: https://devtalk.nvidia.com/default/topic/1031067

--- kernel/nv-linux.h
+++ kernel/nv-linux.h
@@ -757,11 +757,18 @@ extern nv_spinlock_t km_lock;
                         0, 0, NULL, NULL);                      \
     }
 #elif (NV_KMEM_CACHE_CREATE_ARGUMENT_COUNT == 5)
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 16, 0)
+#define NV_KMEM_CACHE_CREATE(kmem_cache, name, type)            \
+    {                                                           \
+        kmem_cache = kmem_cache_create_usercopy(name, sizeof(type), 0, 0, 0, sizeof(type), NULL); \
+    }
+#else
 #define NV_KMEM_CACHE_CREATE(kmem_cache, name, type)            \
     {                                                           \
         kmem_cache = kmem_cache_create(name, sizeof(type),      \
                         0, 0, NULL);                            \
     }
+#endif
 #else
 #error "NV_KMEM_CACHE_CREATE_ARGUMENT_COUNT value unrecognized!"
 #endif