1 /* 2 * QOS-assisted fuzzing helpers 3 * 4 * Copyright (c) 2018 Emanuele Giuseppe Esposito <e.emanuelegiuseppe@gmail.com> 5 * 6 * This library is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License version 2.1 as published by the Free Software Foundation. 9 * 10 * This library is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 * Lesser General Public License for more details. 14 * 15 * You should have received a copy of the GNU Lesser General Public 16 * License along with this library; if not, see <http://www.gnu.org/licenses/> 17 */ 18 19 #include "qemu/osdep.h" 20 #include "qemu/units.h" 21 #include "qapi/error.h" 22 #include "qemu-common.h" 23 #include "exec/memory.h" 24 #include "qemu/main-loop.h" 25 26 #include "tests/qtest/libqos/libqtest.h" 27 #include "tests/qtest/libqos/malloc.h" 28 #include "tests/qtest/libqos/qgraph.h" 29 #include "tests/qtest/libqos/qgraph_internal.h" 30 #include "tests/qtest/libqos/qos_external.h" 31 32 #include "fuzz.h" 33 #include "qos_fuzz.h" 34 35 #include "qapi/qapi-commands-machine.h" 36 #include "qapi/qapi-commands-qom.h" 37 38 39 void *fuzz_qos_obj; 40 QGuestAllocator *fuzz_qos_alloc; 41 42 static const char *fuzz_target_name; 43 static char **fuzz_path_vec; 44 45 static void qos_set_machines_devices_available(void) 46 { 47 MachineInfoList *mach_info; 48 ObjectTypeInfoList *type_info; 49 50 mach_info = qmp_query_machines(&error_abort); 51 machines_apply_to_node(mach_info); 52 qapi_free_MachineInfoList(mach_info); 53 54 type_info = qmp_qom_list_types(true, "device", true, true, 55 &error_abort); 56 types_apply_to_node(type_info); 57 qapi_free_ObjectTypeInfoList(type_info); 58 } 59 60 static char **current_path; 61 62 void *qos_allocate_objects(QTestState *qts, QGuestAllocator **p_alloc) 63 { 64 return allocate_objects(qts, current_path + 1, p_alloc); 65 } 66 67 static GString *qos_build_main_args(void) 68 { 69 char **path = fuzz_path_vec; 70 QOSGraphNode *test_node; 71 GString *cmd_line; 72 void *test_arg; 73 74 if (!path) { 75 fprintf(stderr, "QOS Path not found\n"); 76 abort(); 77 } 78 79 /* Before test */ 80 cmd_line = g_string_new(path[0]); 81 current_path = path; 82 test_node = qos_graph_get_node(path[(g_strv_length(path) - 1)]); 83 test_arg = test_node->u.test.arg; 84 if (test_node->u.test.before) { 85 test_arg = test_node->u.test.before(cmd_line, test_arg); 86 } 87 /* Prepend the arguments that we need */ 88 g_string_prepend(cmd_line, 89 TARGET_NAME " -display none -machine accel=qtest -m 64 "); 90 return cmd_line; 91 } 92 93 /* 94 * This function is largely a copy of qos-test.c:walk_path. Since walk_path 95 * is itself a callback, its a little annoying to add another argument/layer of 96 * indirection 97 */ 98 static void walk_path(QOSGraphNode *orig_path, int len) 99 { 100 QOSGraphNode *path; 101 QOSGraphEdge *edge; 102 103 /* 104 * etype set to QEDGE_CONSUMED_BY so that machine can add to the command 105 * line 106 */ 107 QOSEdgeType etype = QEDGE_CONSUMED_BY; 108 109 /* twice QOS_PATH_MAX_ELEMENT_SIZE since each edge can have its arg */ 110 char **path_vec = g_new0(char *, (QOS_PATH_MAX_ELEMENT_SIZE * 2)); 111 int path_vec_size = 0; 112 113 char *after_cmd, *before_cmd, *after_device; 114 GString *after_device_str = g_string_new(""); 115 char *node_name = orig_path->name, *path_str; 116 117 GString *cmd_line = g_string_new(""); 118 GString *cmd_line2 = g_string_new(""); 119 120 path = qos_graph_get_node(node_name); /* root */ 121 node_name = qos_graph_edge_get_dest(path->path_edge); /* machine name */ 122 123 path_vec[path_vec_size++] = node_name; 124 path_vec[path_vec_size++] = qos_get_machine_type(node_name); 125 126 for (;;) { 127 path = qos_graph_get_node(node_name); 128 if (!path->path_edge) { 129 break; 130 } 131 132 node_name = qos_graph_edge_get_dest(path->path_edge); 133 134 /* append node command line + previous edge command line */ 135 if (path->command_line && etype == QEDGE_CONSUMED_BY) { 136 g_string_append(cmd_line, path->command_line); 137 g_string_append(cmd_line, after_device_str->str); 138 g_string_truncate(after_device_str, 0); 139 } 140 141 path_vec[path_vec_size++] = qos_graph_edge_get_name(path->path_edge); 142 /* detect if edge has command line args */ 143 after_cmd = qos_graph_edge_get_after_cmd_line(path->path_edge); 144 after_device = qos_graph_edge_get_extra_device_opts(path->path_edge); 145 before_cmd = qos_graph_edge_get_before_cmd_line(path->path_edge); 146 edge = qos_graph_get_edge(path->name, node_name); 147 etype = qos_graph_edge_get_type(edge); 148 149 if (before_cmd) { 150 g_string_append(cmd_line, before_cmd); 151 } 152 if (after_cmd) { 153 g_string_append(cmd_line2, after_cmd); 154 } 155 if (after_device) { 156 g_string_append(after_device_str, after_device); 157 } 158 } 159 160 path_vec[path_vec_size++] = NULL; 161 g_string_append(cmd_line, after_device_str->str); 162 g_string_free(after_device_str, true); 163 164 g_string_append(cmd_line, cmd_line2->str); 165 g_string_free(cmd_line2, true); 166 167 /* 168 * here position 0 has <arch>/<machine>, position 1 has <machine>. 169 * The path must not have the <arch>, qtest_add_data_func adds it. 170 */ 171 path_str = g_strjoinv("/", path_vec + 1); 172 173 /* Check that this is the test we care about: */ 174 char *test_name = strrchr(path_str, '/') + 1; 175 if (strcmp(test_name, fuzz_target_name) == 0) { 176 /* 177 * put arch/machine in position 1 so run_one_test can do its work 178 * and add the command line at position 0. 179 */ 180 path_vec[1] = path_vec[0]; 181 path_vec[0] = g_string_free(cmd_line, false); 182 183 fuzz_path_vec = path_vec; 184 } else { 185 g_free(path_vec); 186 } 187 188 g_free(path_str); 189 } 190 191 static GString *qos_get_cmdline(FuzzTarget *t) 192 { 193 /* 194 * Set a global variable that we use to identify the qos_path for our 195 * fuzz_target 196 */ 197 fuzz_target_name = t->name; 198 qos_set_machines_devices_available(); 199 qos_graph_foreach_test_path(walk_path); 200 return qos_build_main_args(); 201 } 202 203 void fuzz_add_qos_target( 204 FuzzTarget *fuzz_opts, 205 const char *interface, 206 QOSGraphTestOptions *opts 207 ) 208 { 209 qos_add_test(fuzz_opts->name, interface, NULL, opts); 210 fuzz_opts->get_init_cmdline = qos_get_cmdline; 211 fuzz_add_target(fuzz_opts); 212 } 213 214 void qos_init_path(QTestState *s) 215 { 216 fuzz_qos_obj = qos_allocate_objects(s , &fuzz_qos_alloc); 217 } 218