OpenCL Device: Do a check on available constant memory size and abort if it's less than 64kB

docs/changes.txt

@@ -41,6 +41,7 @@
 - Files: Do several file and folder checks on startup rather than when they are actually used to avoid related error after eventual intense operations
 - Helper: Added functions to check existence, type, read- and write-permissions and rewrite sources to use them instead of stat()
 - OpenCL Runtime: Updated AMDGPU-Pro driver version check, do warn if version 16.60 is detected which is known to be broken
+- OpenCL Device: Do a check on available constant memory size and abort if it's less than 64kB
 - Sessions: Move out handling of multiple instance from restore file into separate pidfile
 
 * changes v3.20 -> v3.30:

src/opencl.c

@@ -2741,6 +2741,21 @@ int opencl_ctx_devices_init (hashcat_ctx_t *hashcat_ctx, const int comptime)
 
       hcfree (device_extensions);
 
+      // device_max_constant_buffer_size
+
+      cl_ulong device_max_constant_buffer_size;
+
+      CL_rc = hc_clGetDeviceInfo (hashcat_ctx, device_param->device, CL_DEVICE_MAX_CONSTANT_BUFFER_SIZE, sizeof (device_max_constant_buffer_size), &device_max_constant_buffer_size, NULL);
+
+      if (CL_rc == -1) return -1;
+
+      if (device_max_constant_buffer_size < 65536)
+      {
+        event_log_error (hashcat_ctx, "* Device #%u: Device constant buffer size is too small", device_id + 1);
+
+        device_param->skipped = true;
+      }
+
       // device_local_mem_size
 
       cl_ulong device_local_mem_size;