fuzz: add support for qos-assisted fuzz targets

Signed-off-by: Alexander Bulekov <alxndr@bu.edu>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Darren Kenny <darren.kenny@oracle.com>
Message-id: 20200220041118.23264-17-alxndr@bu.edu
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Alexander Bulekov 2020-02-19 23:11:12 -05:00 committed by Stefan Hajnoczi
parent cb06fdad05
commit 275ab39d86
3 changed files with 269 additions and 0 deletions

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QEMU_PROG_FUZZ=qemu-fuzz-$(TARGET_NAME)$(EXESUF)
fuzz-obj-y += tests/qtest/libqtest.o
fuzz-obj-y += $(libqos-obj-y)
fuzz-obj-y += tests/qtest/fuzz/fuzz.o # Fuzzer skeleton
fuzz-obj-y += tests/qtest/fuzz/fork_fuzz.o
fuzz-obj-y += tests/qtest/fuzz/qos_fuzz.o
FUZZ_CFLAGS += -I$(SRC_PATH)/tests -I$(SRC_PATH)/tests/qtest

234
tests/qtest/fuzz/qos_fuzz.c Normal file
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/*
* QOS-assisted fuzzing helpers
*
* Copyright (c) 2018 Emanuele Giuseppe Esposito <e.emanuelegiuseppe@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2 as published by the Free Software Foundation.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>
*/
#include "qemu/osdep.h"
#include "qemu/units.h"
#include "qapi/error.h"
#include "qemu-common.h"
#include "exec/memory.h"
#include "exec/address-spaces.h"
#include "sysemu/sysemu.h"
#include "qemu/main-loop.h"
#include "tests/qtest/libqtest.h"
#include "tests/qtest/libqos/malloc.h"
#include "tests/qtest/libqos/qgraph.h"
#include "tests/qtest/libqos/qgraph_internal.h"
#include "tests/qtest/libqos/qos_external.h"
#include "fuzz.h"
#include "qos_fuzz.h"
#include "qapi/qapi-commands-machine.h"
#include "qapi/qapi-commands-qom.h"
#include "qapi/qmp/qlist.h"
void *fuzz_qos_obj;
QGuestAllocator *fuzz_qos_alloc;
static const char *fuzz_target_name;
static char **fuzz_path_vec;
/*
* Replaced the qmp commands with direct qmp_marshal calls.
* Probably there is a better way to do this
*/
static void qos_set_machines_devices_available(void)
{
QDict *req = qdict_new();
QObject *response;
QDict *args = qdict_new();
QList *lst;
Error *err = NULL;
qmp_marshal_query_machines(NULL, &response, &err);
assert(!err);
lst = qobject_to(QList, response);
apply_to_qlist(lst, true);
qobject_unref(response);
qdict_put_str(req, "execute", "qom-list-types");
qdict_put_str(args, "implements", "device");
qdict_put_bool(args, "abstract", true);
qdict_put_obj(req, "arguments", (QObject *) args);
qmp_marshal_qom_list_types(args, &response, &err);
assert(!err);
lst = qobject_to(QList, response);
apply_to_qlist(lst, false);
qobject_unref(response);
qobject_unref(req);
}
static char **current_path;
void *qos_allocate_objects(QTestState *qts, QGuestAllocator **p_alloc)
{
return allocate_objects(qts, current_path + 1, p_alloc);
}
static const char *qos_build_main_args(void)
{
char **path = fuzz_path_vec;
QOSGraphNode *test_node;
GString *cmd_line = g_string_new(path[0]);
void *test_arg;
if (!path) {
fprintf(stderr, "QOS Path not found\n");
abort();
}
/* Before test */
current_path = path;
test_node = qos_graph_get_node(path[(g_strv_length(path) - 1)]);
test_arg = test_node->u.test.arg;
if (test_node->u.test.before) {
test_arg = test_node->u.test.before(cmd_line, test_arg);
}
/* Prepend the arguments that we need */
g_string_prepend(cmd_line,
TARGET_NAME " -display none -machine accel=qtest -m 64 ");
return cmd_line->str;
}
/*
* This function is largely a copy of qos-test.c:walk_path. Since walk_path
* is itself a callback, its a little annoying to add another argument/layer of
* indirection
*/
static void walk_path(QOSGraphNode *orig_path, int len)
{
QOSGraphNode *path;
QOSGraphEdge *edge;
/* etype set to QEDGE_CONSUMED_BY so that machine can add to the command line */
QOSEdgeType etype = QEDGE_CONSUMED_BY;
/* twice QOS_PATH_MAX_ELEMENT_SIZE since each edge can have its arg */
char **path_vec = g_new0(char *, (QOS_PATH_MAX_ELEMENT_SIZE * 2));
int path_vec_size = 0;
char *after_cmd, *before_cmd, *after_device;
GString *after_device_str = g_string_new("");
char *node_name = orig_path->name, *path_str;
GString *cmd_line = g_string_new("");
GString *cmd_line2 = g_string_new("");
path = qos_graph_get_node(node_name); /* root */
node_name = qos_graph_edge_get_dest(path->path_edge); /* machine name */
path_vec[path_vec_size++] = node_name;
path_vec[path_vec_size++] = qos_get_machine_type(node_name);
for (;;) {
path = qos_graph_get_node(node_name);
if (!path->path_edge) {
break;
}
node_name = qos_graph_edge_get_dest(path->path_edge);
/* append node command line + previous edge command line */
if (path->command_line && etype == QEDGE_CONSUMED_BY) {
g_string_append(cmd_line, path->command_line);
g_string_append(cmd_line, after_device_str->str);
g_string_truncate(after_device_str, 0);
}
path_vec[path_vec_size++] = qos_graph_edge_get_name(path->path_edge);
/* detect if edge has command line args */
after_cmd = qos_graph_edge_get_after_cmd_line(path->path_edge);
after_device = qos_graph_edge_get_extra_device_opts(path->path_edge);
before_cmd = qos_graph_edge_get_before_cmd_line(path->path_edge);
edge = qos_graph_get_edge(path->name, node_name);
etype = qos_graph_edge_get_type(edge);
if (before_cmd) {
g_string_append(cmd_line, before_cmd);
}
if (after_cmd) {
g_string_append(cmd_line2, after_cmd);
}
if (after_device) {
g_string_append(after_device_str, after_device);
}
}
path_vec[path_vec_size++] = NULL;
g_string_append(cmd_line, after_device_str->str);
g_string_free(after_device_str, true);
g_string_append(cmd_line, cmd_line2->str);
g_string_free(cmd_line2, true);
/*
* here position 0 has <arch>/<machine>, position 1 has <machine>.
* The path must not have the <arch>, qtest_add_data_func adds it.
*/
path_str = g_strjoinv("/", path_vec + 1);
/* Check that this is the test we care about: */
char *test_name = strrchr(path_str, '/') + 1;
if (strcmp(test_name, fuzz_target_name) == 0) {
/*
* put arch/machine in position 1 so run_one_test can do its work
* and add the command line at position 0.
*/
path_vec[1] = path_vec[0];
path_vec[0] = g_string_free(cmd_line, false);
fuzz_path_vec = path_vec;
} else {
g_free(path_vec);
}
g_free(path_str);
}
static const char *qos_get_cmdline(FuzzTarget *t)
{
/*
* Set a global variable that we use to identify the qos_path for our
* fuzz_target
*/
fuzz_target_name = t->name;
qos_set_machines_devices_available();
qos_graph_foreach_test_path(walk_path);
return qos_build_main_args();
}
void fuzz_add_qos_target(
FuzzTarget *fuzz_opts,
const char *interface,
QOSGraphTestOptions *opts
)
{
qos_add_test(fuzz_opts->name, interface, NULL, opts);
fuzz_opts->get_init_cmdline = qos_get_cmdline;
fuzz_add_target(fuzz_opts);
}
void qos_init_path(QTestState *s)
{
fuzz_qos_obj = qos_allocate_objects(s , &fuzz_qos_alloc);
}

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/*
* QOS-assisted fuzzing helpers
*
* 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 _QOS_FUZZ_H_
#define _QOS_FUZZ_H_
#include "tests/qtest/fuzz/fuzz.h"
#include "tests/qtest/libqos/qgraph.h"
int qos_fuzz(const unsigned char *Data, size_t Size);
void qos_setup(void);
extern void *fuzz_qos_obj;
extern QGuestAllocator *fuzz_qos_alloc;
void fuzz_add_qos_target(
FuzzTarget *fuzz_opts,
const char *interface,
QOSGraphTestOptions *opts
);
void qos_init_path(QTestState *);
#endif