From 0518e7a28fdbaf27cda7a43d1a52d457536e1d9b Mon Sep 17 00:00:00 2001 From: Andrew Scull Date: Mon, 30 May 2022 10:00:12 +0000 Subject: sandbox: Implement fuzzing engine driver 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 --- drivers/fuzz/Kconfig | 16 ++++++++++++---- drivers/fuzz/Makefile | 1 + drivers/fuzz/sandbox_fuzzing_engine.c | 35 +++++++++++++++++++++++++++++++++++ 3 files changed, 48 insertions(+), 4 deletions(-) create mode 100644 drivers/fuzz/sandbox_fuzzing_engine.c (limited to 'drivers/fuzz') diff --git a/drivers/fuzz/Kconfig b/drivers/fuzz/Kconfig index a03120f63ab..6311385222f 100644 --- a/drivers/fuzz/Kconfig +++ b/drivers/fuzz/Kconfig @@ -3,7 +3,15 @@ config DM_FUZZING_ENGINE 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. + 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/fuzz/Makefile b/drivers/fuzz/Makefile index acd894999c9..073743ba946 100644 --- a/drivers/fuzz/Makefile +++ b/drivers/fuzz/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/fuzz/sandbox_fuzzing_engine.c b/drivers/fuzz/sandbox_fuzzing_engine.c new file mode 100644 index 00000000000..ebb938e5ba8 --- /dev/null +++ b/drivers/fuzz/sandbox_fuzzing_engine.c @@ -0,0 +1,35 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * Copyright (c) 2022 Google, Inc. + * Written by Andrew Scull + */ + +#include +#include +#include +#include + +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,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, +}; -- cgit v1.2.3