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 "exec/address-spaces.h" 25 #include "sysemu/sysemu.h" 26 #include "qemu/main-loop.h" 27 28 #include "tests/qtest/libqos/libqtest.h" 29 #include "tests/qtest/libqos/malloc.h" 30 #include "tests/qtest/libqos/qgraph.h" 31 #include "tests/qtest/libqos/qgraph_internal.h" 32 #include "tests/qtest/libqos/qos_external.h" 33 34 #include "fuzz.h" 35 #include "qos_fuzz.h" 36 37 #include "qapi/qapi-commands-machine.h" 38 #include "qapi/qapi-commands-qom.h" 39 40 41 void *fuzz_qos_obj; 42 QGuestAllocator *fuzz_qos_alloc; 43 44 static const char *fuzz_target_name; 45 static char **fuzz_path_vec; 46 47 static void qos_set_machines_devices_available(void) 48 { 49 MachineInfoList *mach_info; 50 ObjectTypeInfoList *type_info; 51 52 mach_info = qmp_query_machines(&error_abort); 53 machines_apply_to_node(mach_info); 54 qapi_free_MachineInfoList(mach_info); 55 56 type_info = qmp_qom_list_types(true, "device", true, true, 57 &error_abort); 58 types_apply_to_node(type_info); 59 qapi_free_ObjectTypeInfoList(type_info); 60 } 61 62 static char **current_path; 63 64 void *qos_allocate_objects(QTestState *qts, QGuestAllocator **p_alloc) 65 { 66 return allocate_objects(qts, current_path + 1, p_alloc); 67 } 68 69 static GString *qos_build_main_args(void) 70 { 71 char **path = fuzz_path_vec; 72 QOSGraphNode *test_node; 73 GString *cmd_line; 74 void *test_arg; 75 76 if (!path) { 77 fprintf(stderr, "QOS Path not found\n"); 78 abort(); 79 } 80 81 /* Before test */ 82 cmd_line = g_string_new(path[0]); 83 current_path = path; 84 test_node = qos_graph_get_node(path[(g_strv_length(path) - 1)]); 85 test_arg = test_node->u.test.arg; 86 if (test_node->u.test.before) { 87 test_arg = test_node->u.test.before(cmd_line, test_arg); 88 } 89 /* Prepend the arguments that we need */ 90 g_string_prepend(cmd_line, 91 TARGET_NAME " -display none -machine accel=qtest -m 64 "); 92 return cmd_line; 93 } 94 95 /* 96 * This function is largely a copy of qos-test.c:walk_path. Since walk_path 97 * is itself a callback, its a little annoying to add another argument/layer of 98 * indirection 99 */ 100 static void walk_path(QOSGraphNode *orig_path, int len) 101 { 102 QOSGraphNode *path; 103 QOSGraphEdge *edge; 104 105 /* 106 * etype set to QEDGE_CONSUMED_BY so that machine can add to the command 107 * line 108 */ 109 QOSEdgeType etype = QEDGE_CONSUMED_BY; 110 111 /* twice QOS_PATH_MAX_ELEMENT_SIZE since each edge can have its arg */ 112 char **path_vec = g_new0(char *, (QOS_PATH_MAX_ELEMENT_SIZE * 2)); 113 int path_vec_size = 0; 114 115 char *after_cmd, *before_cmd, *after_device; 116 GString *after_device_str = g_string_new(""); 117 char *node_name = orig_path->name, *path_str; 118 119 GString *cmd_line = g_string_new(""); 120 GString *cmd_line2 = g_string_new(""); 121 122 path = qos_graph_get_node(node_name); /* root */ 123 node_name = qos_graph_edge_get_dest(path->path_edge); /* machine name */ 124 125 path_vec[path_vec_size++] = node_name; 126 path_vec[path_vec_size++] = qos_get_machine_type(node_name); 127 128 for (;;) { 129 path = qos_graph_get_node(node_name); 130 if (!path->path_edge) { 131 break; 132 } 133 134 node_name = qos_graph_edge_get_dest(path->path_edge); 135 136 /* append node command line + previous edge command line */ 137 if (path->command_line && etype == QEDGE_CONSUMED_BY) { 138 g_string_append(cmd_line, path->command_line); 139 g_string_append(cmd_line, after_device_str->str); 140 g_string_truncate(after_device_str, 0); 141 } 142 143 path_vec[path_vec_size++] = qos_graph_edge_get_name(path->path_edge); 144 /* detect if edge has command line args */ 145 after_cmd = qos_graph_edge_get_after_cmd_line(path->path_edge); 146 after_device = qos_graph_edge_get_extra_device_opts(path->path_edge); 147 before_cmd = qos_graph_edge_get_before_cmd_line(path->path_edge); 148 edge = qos_graph_get_edge(path->name, node_name); 149 etype = qos_graph_edge_get_type(edge); 150 151 if (before_cmd) { 152 g_string_append(cmd_line, before_cmd); 153 } 154 if (after_cmd) { 155 g_string_append(cmd_line2, after_cmd); 156 } 157 if (after_device) { 158 g_string_append(after_device_str, after_device); 159 } 160 } 161 162 path_vec[path_vec_size++] = NULL; 163 g_string_append(cmd_line, after_device_str->str); 164 g_string_free(after_device_str, true); 165 166 g_string_append(cmd_line, cmd_line2->str); 167 g_string_free(cmd_line2, true); 168 169 /* 170 * here position 0 has <arch>/<machine>, position 1 has <machine>. 171 * The path must not have the <arch>, qtest_add_data_func adds it. 172 */ 173 path_str = g_strjoinv("/", path_vec + 1); 174 175 /* Check that this is the test we care about: */ 176 char *test_name = strrchr(path_str, '/') + 1; 177 if (strcmp(test_name, fuzz_target_name) == 0) { 178 /* 179 * put arch/machine in position 1 so run_one_test can do its work 180 * and add the command line at position 0. 181 */ 182 path_vec[1] = path_vec[0]; 183 path_vec[0] = g_string_free(cmd_line, false); 184 185 fuzz_path_vec = path_vec; 186 } else { 187 g_free(path_vec); 188 } 189 190 g_free(path_str); 191 } 192 193 static GString *qos_get_cmdline(FuzzTarget *t) 194 { 195 /* 196 * Set a global variable that we use to identify the qos_path for our 197 * fuzz_target 198 */ 199 fuzz_target_name = t->name; 200 qos_set_machines_devices_available(); 201 qos_graph_foreach_test_path(walk_path); 202 return qos_build_main_args(); 203 } 204 205 void fuzz_add_qos_target( 206 FuzzTarget *fuzz_opts, 207 const char *interface, 208 QOSGraphTestOptions *opts 209 ) 210 { 211 qos_add_test(fuzz_opts->name, interface, NULL, opts); 212 fuzz_opts->get_init_cmdline = qos_get_cmdline; 213 fuzz_add_target(fuzz_opts); 214 } 215 216 void qos_init_path(QTestState *s) 217 { 218 fuzz_qos_obj = qos_allocate_objects(s , &fuzz_qos_alloc); 219 } 220