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 "exec/memory.h" 23 #include "qemu/main-loop.h" 24 25 #include "tests/qtest/libqos/libqtest.h" 26 #include "tests/qtest/libqos/malloc.h" 27 #include "tests/qtest/libqos/qgraph.h" 28 #include "tests/qtest/libqos/qgraph_internal.h" 29 #include "tests/qtest/libqos/qos_external.h" 30 31 #include "fuzz.h" 32 #include "qos_fuzz.h" 33 34 #include "qapi/qapi-commands-machine.h" 35 #include "qapi/qapi-commands-qom.h" 36 37 38 void *fuzz_qos_obj; 39 QGuestAllocator *fuzz_qos_alloc; 40 41 static const char *fuzz_target_name; 42 static char **fuzz_path_vec; 43 44 static void qos_set_machines_devices_available(void) 45 { 46 MachineInfoList *mach_info; 47 ObjectTypeInfoList *type_info; 48 49 mach_info = qmp_query_machines(&error_abort); 50 machines_apply_to_node(mach_info); 51 qapi_free_MachineInfoList(mach_info); 52 53 type_info = qmp_qom_list_types(true, "device", true, true, 54 &error_abort); 55 types_apply_to_node(type_info); 56 qapi_free_ObjectTypeInfoList(type_info); 57 } 58 59 static char **current_path; 60 61 void *qos_allocate_objects(QTestState *qts, QGuestAllocator **p_alloc) 62 { 63 return allocate_objects(qts, current_path + 1, p_alloc); 64 } 65 66 static GString *qos_build_main_args(void) 67 { 68 char **path = fuzz_path_vec; 69 QOSGraphNode *test_node; 70 GString *cmd_line; 71 void *test_arg; 72 73 if (!path) { 74 fprintf(stderr, "QOS Path not found\n"); 75 abort(); 76 } 77 78 /* Before test */ 79 cmd_line = g_string_new(path[0]); 80 current_path = path; 81 test_node = qos_graph_get_node(path[(g_strv_length(path) - 1)]); 82 test_arg = test_node->u.test.arg; 83 if (test_node->u.test.before) { 84 test_arg = test_node->u.test.before(cmd_line, test_arg); 85 } 86 /* Prepend the arguments that we need */ 87 g_string_prepend(cmd_line, 88 TARGET_NAME " -display none -machine accel=qtest -m 64 "); 89 return cmd_line; 90 } 91 92 /* 93 * This function is largely a copy of qos-test.c:walk_path. Since walk_path 94 * is itself a callback, its a little annoying to add another argument/layer of 95 * indirection 96 */ 97 static void walk_path(QOSGraphNode *orig_path, int len) 98 { 99 QOSGraphNode *path; 100 QOSGraphEdge *edge; 101 102 /* 103 * etype set to QEDGE_CONSUMED_BY so that machine can add to the command 104 * line 105 */ 106 QOSEdgeType etype = QEDGE_CONSUMED_BY; 107 108 /* twice QOS_PATH_MAX_ELEMENT_SIZE since each edge can have its arg */ 109 char **path_vec = g_new0(char *, (QOS_PATH_MAX_ELEMENT_SIZE * 2)); 110 int path_vec_size = 0; 111 112 char *after_cmd, *before_cmd, *after_device; 113 GString *after_device_str = g_string_new(""); 114 char *node_name = orig_path->name, *path_str; 115 116 GString *cmd_line = g_string_new(""); 117 GString *cmd_line2 = g_string_new(""); 118 119 path = qos_graph_get_node(node_name); /* root */ 120 node_name = qos_graph_edge_get_dest(path->path_edge); /* machine name */ 121 122 path_vec[path_vec_size++] = node_name; 123 path_vec[path_vec_size++] = qos_get_machine_type(node_name); 124 125 for (;;) { 126 path = qos_graph_get_node(node_name); 127 if (!path->path_edge) { 128 break; 129 } 130 131 node_name = qos_graph_edge_get_dest(path->path_edge); 132 133 /* append node command line + previous edge command line */ 134 if (path->command_line && etype == QEDGE_CONSUMED_BY) { 135 g_string_append(cmd_line, path->command_line); 136 g_string_append(cmd_line, after_device_str->str); 137 g_string_truncate(after_device_str, 0); 138 } 139 140 path_vec[path_vec_size++] = qos_graph_edge_get_name(path->path_edge); 141 /* detect if edge has command line args */ 142 after_cmd = qos_graph_edge_get_after_cmd_line(path->path_edge); 143 after_device = qos_graph_edge_get_extra_device_opts(path->path_edge); 144 before_cmd = qos_graph_edge_get_before_cmd_line(path->path_edge); 145 edge = qos_graph_get_edge(path->name, node_name); 146 etype = qos_graph_edge_get_type(edge); 147 148 if (before_cmd) { 149 g_string_append(cmd_line, before_cmd); 150 } 151 if (after_cmd) { 152 g_string_append(cmd_line2, after_cmd); 153 } 154 if (after_device) { 155 g_string_append(after_device_str, after_device); 156 } 157 } 158 159 path_vec[path_vec_size++] = NULL; 160 g_string_append(cmd_line, after_device_str->str); 161 g_string_free(after_device_str, true); 162 163 g_string_append(cmd_line, cmd_line2->str); 164 g_string_free(cmd_line2, true); 165 166 /* 167 * here position 0 has <arch>/<machine>, position 1 has <machine>. 168 * The path must not have the <arch>, qtest_add_data_func adds it. 169 */ 170 path_str = g_strjoinv("/", path_vec + 1); 171 172 /* Check that this is the test we care about: */ 173 char *test_name = strrchr(path_str, '/') + 1; 174 if (strcmp(test_name, fuzz_target_name) == 0) { 175 /* 176 * put arch/machine in position 1 so run_one_test can do its work 177 * and add the command line at position 0. 178 */ 179 path_vec[1] = path_vec[0]; 180 path_vec[0] = g_string_free(cmd_line, false); 181 182 fuzz_path_vec = path_vec; 183 } else { 184 g_free(path_vec); 185 } 186 187 g_free(path_str); 188 } 189 190 static GString *qos_get_cmdline(FuzzTarget *t) 191 { 192 /* 193 * Set a global variable that we use to identify the qos_path for our 194 * fuzz_target 195 */ 196 fuzz_target_name = t->name; 197 qos_set_machines_devices_available(); 198 qos_graph_foreach_test_path(walk_path); 199 return qos_build_main_args(); 200 } 201 202 void fuzz_add_qos_target( 203 FuzzTarget *fuzz_opts, 204 const char *interface, 205 QOSGraphTestOptions *opts 206 ) 207 { 208 qos_add_test(fuzz_opts->name, interface, NULL, opts); 209 fuzz_opts->get_init_cmdline = qos_get_cmdline; 210 fuzz_add_target(fuzz_opts); 211 } 212 213 void qos_init_path(QTestState *s) 214 { 215 fuzz_qos_obj = qos_allocate_objects(s , &fuzz_qos_alloc); 216 } 217