[Qemu-devel] [RFC 04/19] fuzz: Add qos support to fuzz targets

["Oleinik, Alexander" <alxndr@bu.edu>]

qos_helpers.c is largely a copy of tests/qos-test.c

Signed-off-by: Alexander Oleinik <alxndr@bu.edu>
---
 tests/fuzz/qos_fuzz.c    |  63 +++++++++
 tests/fuzz/qos_fuzz.h    |  29 ++++
 tests/fuzz/qos_helpers.c | 295 +++++++++++++++++++++++++++++++++++++++
 tests/fuzz/qos_helpers.h |  17 +++
 4 files changed, 404 insertions(+)
 create mode 100644 tests/fuzz/qos_fuzz.c
 create mode 100644 tests/fuzz/qos_fuzz.h
 create mode 100644 tests/fuzz/qos_helpers.c
 create mode 100644 tests/fuzz/qos_helpers.h

diff --git a/tests/fuzz/qos_fuzz.c b/tests/fuzz/qos_fuzz.c
new file mode 100644
index 0000000000..ac7bb735ac
--- /dev/null
+++ b/tests/fuzz/qos_fuzz.c
@@ -0,0 +1,63 @@
+
+
+#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 "libqos/malloc.h"
+#include "libqos/qgraph.h"
+#include "libqos/qgraph_internal.h"
+
+#include "hw/virtio/virtio-net.h"
+#include "hw/virtio/virtio.h"
+#include "libqos/virtio-net.h"
+#include "fuzz.h"
+#include "qos_fuzz.h"
+#include "qos_helpers.h"
+#include "tests/libqos/qgraph.h"
+#include "tests/libqtest.h"
+
+
+fuzz_memory_region *fuzz_memory_region_head;
+fuzz_memory_region *fuzz_memory_region_tail;
+
+uint64_t total_io_mem = 0;
+uint64_t total_ram_mem = 0;
+
+
+//TODO: Put arguments in a neater struct
+void fuzz_add_qos_target(const char* name,
+		const char* description,
+		const char* interface,
+		QOSGraphTestOptions* opts,
+		void(*init_pre_main)(void),
+		void(*init_pre_save)(void),
+		void(*save_state)(void),
+		void(*reset)(void),
+		void(*pre_fuzz)(void),
+		void(*fuzz)(const unsigned char*, size_t),
+		void(*post_fuzz)(void))
+{
+	qos_add_test(name, interface, NULL, opts);
+	fuzz_add_target(name, description, init_pre_main, init_pre_save,
+			save_state, reset, pre_fuzz, fuzz, post_fuzz, &qos_argc, &qos_argv);
+}
+
+
+// Do what is normally done in qos_test.c:main
+void qos_setup(void){
+	qtest_setup();
+	qos_set_machines_devices_available();
+	qos_graph_foreach_test_path(walk_path);
+	qos_build_main_args();
+}
+
+void qos_init_path(void)
+{
+	qos_obj = qos_allocate_objects(global_qtest, &qos_alloc);
+}
diff --git a/tests/fuzz/qos_fuzz.h b/tests/fuzz/qos_fuzz.h
new file mode 100644
index 0000000000..098f81f570
--- /dev/null
+++ b/tests/fuzz/qos_fuzz.h
@@ -0,0 +1,29 @@
+#ifndef _QOS_FUZZ_H_
+#define _QOS_FUZZ_H_
+
+#include "tests/libqos/qgraph.h"
+
+int qos_fuzz(const unsigned char *Data, size_t Size);
+void qos_setup(void);
+
+extern char **fuzz_path_vec;
+extern int qos_argc;
+extern char **qos_argv;
+extern void* qos_obj;
+extern QGuestAllocator *qos_alloc;
+
+
+void fuzz_add_qos_target(const char* name,
+		const char* description,
+		const char* interface,
+		QOSGraphTestOptions* opts,
+		void(*init_pre_main)(void),
+		void(*init_pre_save)(void),
+		void(*save_state)(void),
+		void(*reset)(void),
+		void(*pre_fuzz)(void),
+		void(*fuzz)(const unsigned char*, size_t),
+		void(*post_fuzz)(void));
+
+void qos_init_path(void);
+#endif
diff --git a/tests/fuzz/qos_helpers.c b/tests/fuzz/qos_helpers.c
new file mode 100644
index 0000000000..79523c0552
--- /dev/null
+++ b/tests/fuzz/qos_helpers.c
@@ -0,0 +1,295 @@
+#include "qemu/osdep.h"
+#include "qemu-common.h"
+#include "qos_helpers.h"
+#include "fuzz.h"
+#include "qapi/qmp/qlist.h"
+#include "libqtest.h"
+#include "sysemu/qtest.h"
+#include "libqos/qgraph.h"
+#include "libqos/qgraph_internal.h"
+#include "./qapi/qapi-commands-machine.h"
+#include "./qapi/qapi-commands-misc.h"
+#include "./qapi/qapi-commands-qom.h"
+#include <wordexp.h>
+#include "sysemu/sysemu.h"
+#include "sysemu/cpus.h"
+
+
+/* 
+ * This file is almost completely copied from tests/qos-test.c
+ * TODO: Find a way to re-use the code in tests/qos-test.c
+ */
+
+static void apply_to_node(const char *name, bool is_machine, bool is_abstract)
+{
+    char *machine_name = NULL;
+    if (is_machine) {
+        const char *arch = qtest_get_arch();
+        machine_name = g_strconcat(arch, "/", name, NULL);
+        name = machine_name;
+    }
+    qos_graph_node_set_availability(name, true);
+    if (is_abstract) {
+        qos_delete_cmd_line(name);
+    }
+    g_free(machine_name);
+}
+
+static void apply_to_qlist(QList *list, bool is_machine)
+{
+    const QListEntry *p;
+    const char *name;
+    bool abstract;
+    QDict *minfo;
+    QObject *qobj;
+    QString *qstr;
+    QBool *qbool;
+
+    for (p = qlist_first(list); p; p = qlist_next(p)) {
+        minfo = qobject_to(QDict, qlist_entry_obj(p));
+        qobj = qdict_get(minfo, "name");
+        qstr = qobject_to(QString, qobj);
+        name = qstring_get_str(qstr);
+
+        qobj = qdict_get(minfo, "abstract");
+        if (qobj) {
+            qbool = qobject_to(QBool, qobj);
+            abstract = qbool_get_bool(qbool);
+        } else {
+            abstract = false;
+        }
+
+        apply_to_node(name, is_machine, abstract);
+        qobj = qdict_get(minfo, "alias");
+        if (qobj) {
+            qstr = qobject_to(QString, qobj);
+            name = qstring_get_str(qstr);
+            apply_to_node(name, is_machine, abstract);
+        }
+    }
+}
+
+
+/*
+ * Replaced the qmp commands with direct qmp_marshal calls.
+ * Probably there is a better way to do this
+ */
+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;
+
+static QGuestAllocator *get_machine_allocator(QOSGraphObject *obj)
+{
+    return obj->get_driver(obj, "memory");
+}
+
+void *qos_allocate_objects(QTestState *qts, QGuestAllocator **p_alloc)
+{
+    return allocate_objects(qts, current_path + 1, p_alloc);
+}
+
+void *allocate_objects(QTestState *qts, char **path, QGuestAllocator **p_alloc)
+{
+    int current = 0;
+    QGuestAllocator *alloc;
+    QOSGraphObject *parent = NULL;
+    QOSGraphEdge *edge;
+    QOSGraphNode *node;
+    void *edge_arg;
+    void *obj;
+
+    node = qos_graph_get_node(path[current]);
+    g_assert(node->type == QNODE_MACHINE);
+
+    obj = qos_machine_new(node, qts);
+    qos_object_queue_destroy(obj);
+
+    alloc = get_machine_allocator(obj);
+    if (p_alloc) {
+        *p_alloc = alloc;
+    }
+
+    for (;;) {
+        if (node->type != QNODE_INTERFACE) {
+            qos_object_start_hw(obj);
+            parent = obj;
+        }
+
+        /* follow edge and get object for next node constructor */
+        current++;
+        edge = qos_graph_get_edge(path[current - 1], path[current]);
+        node = qos_graph_get_node(path[current]);
+
+        if (node->type == QNODE_TEST) {
+            g_assert(qos_graph_edge_get_type(edge) == QEDGE_CONSUMED_BY);
+            return obj;
+        }
+
+        switch (qos_graph_edge_get_type(edge)) {
+            case QEDGE_PRODUCES:
+                obj = parent->get_driver(parent, path[current]);
+                break;
+
+            case QEDGE_CONSUMED_BY:
+                edge_arg = qos_graph_edge_get_arg(edge);
+                obj = qos_driver_new(node, obj, alloc, edge_arg);
+                qos_object_queue_destroy(obj);
+                break;
+
+            case QEDGE_CONTAINS:
+                obj = parent->get_device(parent, path[current]);
+                break;
+        }
+    }
+}
+
+char **fuzz_path_vec;
+void* qos_obj;
+QGuestAllocator *qos_alloc;
+
+int qos_argc;
+char **qos_argv;
+
+void qos_build_main_args()
+{
+    char **path = fuzz_path_vec;
+    QOSGraphNode *test_node;
+    GString *cmd_line = g_string_new(path[0]);
+    void *test_arg;
+
+    /* 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, "qemu-system-i386 -display none -machine accel=fuzz -m 3 ");
+    wordexp_t result;
+    wordexp (cmd_line->str, &result, 0);
+    qos_argc = result.we_wordc;
+    qos_argv = result.we_wordv;
+
+    g_string_free(cmd_line, true);
+}
+
+
+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->str) == 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);
+        printf("path_str: %s path_vec[0]: %s [1]: %s\n", path_str, path_vec[0], path_vec[1]);
+
+        fuzz_path_vec = path_vec;
+    } 
+    else {
+        g_free(path_vec);
+    }
+
+    g_free(path_str);
+}
diff --git a/tests/fuzz/qos_helpers.h b/tests/fuzz/qos_helpers.h
new file mode 100644
index 0000000000..baf9b49e9c
--- /dev/null
+++ b/tests/fuzz/qos_helpers.h
@@ -0,0 +1,17 @@
+#ifndef QOS_HELPERS_H
+#define QOS_HELPERS_H
+
+#include "qemu/osdep.h"
+#include "qapi/qmp/qdict.h"
+#include "qapi/qmp/qbool.h"
+#include "qapi/qmp/qstring.h"
+#include "libqtest.h"
+#include "qapi/qmp/qlist.h"
+#include "libqos/qgraph_internal.h"
+
+
+void qos_set_machines_devices_available(void);
+void *allocate_objects(QTestState *qts, char **path, QGuestAllocator **p_alloc);
+void walk_path(QOSGraphNode *orig_path, int len);
+void qos_build_main_args(void);
+#endif
-- 
2.20.1