f5ec79f5e0
In the initial FuzzTarget, get_init_cmdline returned a char *. With this API, we had no guarantee about where the string came from. For example, i440fx-qtest-reboot-fuzz simply returned a pointer to a string literal, while the QOS-based targets build the arguments out in a GString an return the gchar *str pointer. Since we did not try to free the cmdline, we have a leak for any targets that do not simply return string literals. Clean up this mess by forcing fuzz-targets to return a GString, that we can free. Signed-off-by: Alexander Bulekov <alxndr@bu.edu> Message-Id: <20200714174616.20709-1-alxndr@bu.edu> Reviewed-by: Darren Kenny <darren.kenny@oracle.com> Signed-off-by: Thomas Huth <thuth@redhat.com>
99 lines
2.5 KiB
C
99 lines
2.5 KiB
C
/*
|
|
* fuzzing driver
|
|
*
|
|
* Copyright Red Hat Inc., 2019
|
|
*
|
|
* Authors:
|
|
* Alexander Bulekov <alxndr@bu.edu>
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2 or later.
|
|
* See the COPYING file in the top-level directory.
|
|
*
|
|
*/
|
|
|
|
#ifndef FUZZER_H_
|
|
#define FUZZER_H_
|
|
|
|
#include "qemu/osdep.h"
|
|
#include "qemu/units.h"
|
|
#include "qapi/error.h"
|
|
|
|
#include "tests/qtest/libqtest.h"
|
|
|
|
/**
|
|
* A libfuzzer fuzzing target
|
|
*
|
|
* The QEMU fuzzing binary is built with all available targets, each
|
|
* with a unique @name that can be specified on the command-line to
|
|
* select which target should run.
|
|
*
|
|
* A target must implement ->fuzz() to process a random input. If QEMU
|
|
* crashes in ->fuzz() then libfuzzer will record a failure.
|
|
*
|
|
* Fuzzing targets are registered with fuzz_add_target():
|
|
*
|
|
* static const FuzzTarget fuzz_target = {
|
|
* .name = "my-device-fifo",
|
|
* .description = "Fuzz the FIFO buffer registers of my-device",
|
|
* ...
|
|
* };
|
|
*
|
|
* static void register_fuzz_target(void)
|
|
* {
|
|
* fuzz_add_target(&fuzz_target);
|
|
* }
|
|
* fuzz_target_init(register_fuzz_target);
|
|
*/
|
|
typedef struct FuzzTarget {
|
|
const char *name; /* target identifier (passed to --fuzz-target=)*/
|
|
const char *description; /* help text */
|
|
|
|
|
|
/*
|
|
* Returns the arguments that are passed to qemu/softmmu init(). Freed by
|
|
* the caller.
|
|
*/
|
|
GString *(*get_init_cmdline)(struct FuzzTarget *);
|
|
|
|
/*
|
|
* will run once, prior to running qemu/softmmu init.
|
|
* eg: set up shared-memory for communication with the child-process
|
|
* Can be NULL
|
|
*/
|
|
void(*pre_vm_init)(void);
|
|
|
|
/*
|
|
* will run once, after QEMU has been initialized, prior to the fuzz-loop.
|
|
* eg: detect the memory map
|
|
* Can be NULL
|
|
*/
|
|
void(*pre_fuzz)(QTestState *);
|
|
|
|
/*
|
|
* accepts and executes an input from libfuzzer. this is repeatedly
|
|
* executed during the fuzzing loop. Its should handle setup, input
|
|
* execution and cleanup.
|
|
* Cannot be NULL
|
|
*/
|
|
void(*fuzz)(QTestState *, const unsigned char *, size_t);
|
|
|
|
} FuzzTarget;
|
|
|
|
void flush_events(QTestState *);
|
|
void reboot(QTestState *);
|
|
|
|
/* Use the QTest ASCII protocol or call address_space API directly?*/
|
|
void fuzz_qtest_set_serialize(bool option);
|
|
|
|
/*
|
|
* makes a copy of *target and adds it to the target-list.
|
|
* i.e. fine to set up target on the caller's stack
|
|
*/
|
|
void fuzz_add_target(const FuzzTarget *target);
|
|
|
|
int LLVMFuzzerTestOneInput(const unsigned char *Data, size_t Size);
|
|
int LLVMFuzzerInitialize(int *argc, char ***argv, char ***envp);
|
|
|
|
#endif
|
|
|