fuzzing_engine: Add fuzzing engine uclass
This new class of device will provide fuzzing inputs from a fuzzing
engine.
Signed-off-by: Andrew Scull <ascull@google.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/drivers/Kconfig b/drivers/Kconfig
index b26ca8c..8b6fead 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -40,6 +40,8 @@
source "drivers/firmware/Kconfig"
+source "drivers/fuzz/Kconfig"
+
source "drivers/fpga/Kconfig"
source "drivers/gpio/Kconfig"
diff --git a/drivers/Makefile b/drivers/Makefile
index 67c8af7..d63fd1c 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -115,6 +115,7 @@
obj-$(CONFIG_W1_EEPROM) += w1-eeprom/
obj-$(CONFIG_MACH_PIC32) += ddr/microchip/
+obj-$(CONFIG_FUZZ) += fuzz/
obj-$(CONFIG_DM_HWSPINLOCK) += hwspinlock/
obj-$(CONFIG_DM_RNG) += rng/
endif
diff --git a/drivers/fuzz/Kconfig b/drivers/fuzz/Kconfig
new file mode 100644
index 0000000..a03120f
--- /dev/null
+++ b/drivers/fuzz/Kconfig
@@ -0,0 +1,9 @@
+config DM_FUZZING_ENGINE
+ bool "Driver support for fuzzing engine devices"
+ depends on DM
+ help
+ Enable driver model for fuzzing engine devices. This interface is
+ used to get successive inputs from a fuzzing engine that aims to
+ explore different code paths in a fuzz test. The fuzzing engine may
+ be instrumenting the execution in order to more effectively generate
+ inputs that explore different code paths.
diff --git a/drivers/fuzz/Makefile b/drivers/fuzz/Makefile
new file mode 100644
index 0000000..acd8949
--- /dev/null
+++ b/drivers/fuzz/Makefile
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Copyright (c) 2022 Google, Inc.
+# Written by Andrew Scull <ascull@google.com>
+#
+
+obj-$(CONFIG_DM_FUZZING_ENGINE) += fuzzing_engine-uclass.o
diff --git a/drivers/fuzz/fuzzing_engine-uclass.c b/drivers/fuzz/fuzzing_engine-uclass.c
new file mode 100644
index 0000000..b16f1c4
--- /dev/null
+++ b/drivers/fuzz/fuzzing_engine-uclass.c
@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (c) 2022 Google, Inc.
+ * Written by Andrew Scull <ascull@google.com>
+ */
+
+#define LOG_CATEGORY UCLASS_FUZZING_ENGINE
+
+#include <common.h>
+#include <dm.h>
+#include <fuzzing_engine.h>
+
+int dm_fuzzing_engine_get_input(struct udevice *dev,
+ const uint8_t **data,
+ size_t *size)
+{
+ const struct dm_fuzzing_engine_ops *ops = device_get_ops(dev);
+
+ if (!ops->get_input)
+ return -ENOSYS;
+
+ return ops->get_input(dev, data, size);
+}
+
+UCLASS_DRIVER(fuzzing_engine) = {
+ .name = "fuzzing_engine",
+ .id = UCLASS_FUZZING_ENGINE,
+};