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