Add a fuzzing engine driver for the sandbox to take inputs from
libfuzzer and expose them to the fuzz tests.
Signed-off-by: Andrew Scull <asc...@google.com>
---
arch/Kconfig | 2 ++
arch/sandbox/dts/test.dts | 4 +++
drivers/fuzzing_engine/Kconfig | 11 ++++++
drivers/fuzzing_engine/Makefile | 1 +
.../fuzzing_engine/sandbox_fuzzing_engine.c | 35 +++++++++++++++++++
5 files changed, 53 insertions(+)
create mode 100644 drivers/fuzzing_engine/sandbox_fuzzing_engine.c
diff --git a/arch/Kconfig b/arch/Kconfig
index e6191446a3..6320a98db6 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -135,6 +135,7 @@ config SANDBOX
select BZIP2
select CMD_POWEROFF
select DM
+ select DM_FUZZING_ENGINE
select DM_GPIO
select DM_I2C
select DM_KEYBOARD
@@ -170,6 +171,7 @@ config SANDBOX
imply CRC32_VERIFY
imply FAT_WRITE
imply FIRMWARE
+ imply FUZZING_ENGINE_SANDBOX
imply HASH_VERIFY
imply LZMA
imply TEE
diff --git a/arch/sandbox/dts/test.dts b/arch/sandbox/dts/test.dts
index 48ca3e1e47..848329fda5 100644
--- a/arch/sandbox/dts/test.dts
+++ b/arch/sandbox/dts/test.dts
@@ -71,6 +71,10 @@
};
};
+ fuzzing-engine {
+ compatible = "sandbox,sandbox-fuzzing-engine";
+ };
+
reboot-mode0 {
compatible = "reboot-mode-gpio";
gpios = <&gpio_c 0 GPIO_ACTIVE_HIGH>, <&gpio_c 1
GPIO_ACTIVE_HIGH>;
diff --git a/drivers/fuzzing_engine/Kconfig b/drivers/fuzzing_engine/Kconfig
index f405fc75e8..6311385222 100644
--- a/drivers/fuzzing_engine/Kconfig
+++ b/drivers/fuzzing_engine/Kconfig
@@ -4,3 +4,14 @@ config DM_FUZZING_ENGINE
help
Enable driver model for fuzzing engine devices. This interface is
used to get fuzzing inputs from a fuzzing engine.
+
+if DM_FUZZING_ENGINE
+
+config FUZZING_ENGINE_SANDBOX
+ bool "Sanbox fuzzing engine"
+ depends on SANDBOX
+ default y
+ help
+ Enable fuzzing engine for sandbox.
+
+endif
diff --git a/drivers/fuzzing_engine/Makefile b/drivers/fuzzing_engine/Makefile
index acd894999c..073743ba94 100644
--- a/drivers/fuzzing_engine/Makefile
+++ b/drivers/fuzzing_engine/Makefile
@@ -5,3 +5,4 @@
#
obj-$(CONFIG_DM_FUZZING_ENGINE) += fuzzing_engine-uclass.o
+obj-$(CONFIG_FUZZING_ENGINE_SANDBOX) += sandbox_fuzzing_engine.o
diff --git a/drivers/fuzzing_engine/sandbox_fuzzing_engine.c
b/drivers/fuzzing_engine/sandbox_fuzzing_engine.c
new file mode 100644
index 0000000000..4d187deaa4
--- /dev/null
+++ b/drivers/fuzzing_engine/sandbox_fuzzing_engine.c
@@ -0,0 +1,35 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (c) 2022 Google, Inc.
+ * Written by Andrew Scull <asc...@google.com>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <fuzzing_engine.h>
+#include <asm/fuzzing_engine.h>
+
+static int get_input(struct udevice *dev,
+ const uint8_t **data,
+ size_t *size)
+{
+ return sandbox_fuzzing_engine_get_input(data, size);
+}
+
+static const struct dm_fuzzing_engine_ops sandbox_fuzzing_engine_ops = {
+ .get_input = get_input,
+};
+
+static const struct udevice_id sandbox_fuzzing_engine_match[] = {
+ {
+ .compatible = "sandbox,sandbox-fuzzing-engine",
+ },
+ {},
+};
+
+U_BOOT_DRIVER(sandbox_fuzzing_engine) = {
+ .name = "sandbox-fuzzing-engine",
+ .id = UCLASS_FUZZING_ENGINE,
+ .of_match = sandbox_fuzzing_engine_match,
+ .ops = &sandbox_fuzzing_engine_ops,
+};
--
2.35.1.1094.g7c7d902a7c-goog
