tests/qtest/fuzz/qos_fuzz.c

   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/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 = g_string_new(path[0]);
  74     void *test_arg;
  75
  76     if (!path) {
  77         fprintf(stderr, "QOS Path not found\n");
  78         abort();
  79     }
  80
  81     /* Before test */
  82     current_path = path;
  83     test_node = qos_graph_get_node(path[(g_strv_length(path) - 1)]);
  84     test_arg = test_node->u.test.arg;
  85     if (test_node->u.test.before) {
  86         test_arg = test_node->u.test.before(cmd_line, test_arg);
  87     }
  88     /* Prepend the arguments that we need */
  89     g_string_prepend(cmd_line,
  90             TARGET_NAME " -display none -machine accel=qtest -m 64 ");
  91     return cmd_line;
  92 }
  93
  94 /*
  95  * This function is largely a copy of qos-test.c:walk_path. Since walk_path
  96  * is itself a callback, its a little annoying to add another argument/layer of
  97  * indirection
  98  */
  99 static void walk_path(QOSGraphNode *orig_path, int len)
 100 {
 101     QOSGraphNode *path;
 102     QOSGraphEdge *edge;
 103
 104     /*
 105      * etype set to QEDGE_CONSUMED_BY so that machine can add to the command
 106      * line
 107      */
 108     QOSEdgeType etype = QEDGE_CONSUMED_BY;
 109
 110     /* twice QOS_PATH_MAX_ELEMENT_SIZE since each edge can have its arg */
 111     char **path_vec = g_new0(char *, (QOS_PATH_MAX_ELEMENT_SIZE * 2));
 112     int path_vec_size = 0;
 113
 114     char *after_cmd, *before_cmd, *after_device;
 115     GString *after_device_str = g_string_new("");
 116     char *node_name = orig_path->name, *path_str;
 117
 118     GString *cmd_line = g_string_new("");
 119     GString *cmd_line2 = g_string_new("");
 120
 121     path = qos_graph_get_node(node_name); /* root */
 122     node_name = qos_graph_edge_get_dest(path->path_edge); /* machine name */
 123
 124     path_vec[path_vec_size++] = node_name;
 125     path_vec[path_vec_size++] = qos_get_machine_type(node_name);
 126
 127     for (;;) {
 128         path = qos_graph_get_node(node_name);
 129         if (!path->path_edge) {
 130             break;
 131         }
 132
 133         node_name = qos_graph_edge_get_dest(path->path_edge);
 134
 135         /* append node command line + previous edge command line */
 136         if (path->command_line && etype == QEDGE_CONSUMED_BY) {
 137             g_string_append(cmd_line, path->command_line);
 138             g_string_append(cmd_line, after_device_str->str);
 139             g_string_truncate(after_device_str, 0);
 140         }
 141
 142         path_vec[path_vec_size++] = qos_graph_edge_get_name(path->path_edge);
 143         /* detect if edge has command line args */
 144         after_cmd = qos_graph_edge_get_after_cmd_line(path->path_edge);
 145         after_device = qos_graph_edge_get_extra_device_opts(path->path_edge);
 146         before_cmd = qos_graph_edge_get_before_cmd_line(path->path_edge);
 147         edge = qos_graph_get_edge(path->name, node_name);
 148         etype = qos_graph_edge_get_type(edge);
 149
 150         if (before_cmd) {
 151             g_string_append(cmd_line, before_cmd);
 152         }
 153         if (after_cmd) {
 154             g_string_append(cmd_line2, after_cmd);
 155         }
 156         if (after_device) {
 157             g_string_append(after_device_str, after_device);
 158         }
 159     }
 160
 161     path_vec[path_vec_size++] = NULL;
 162     g_string_append(cmd_line, after_device_str->str);
 163     g_string_free(after_device_str, true);
 164
 165     g_string_append(cmd_line, cmd_line2->str);
 166     g_string_free(cmd_line2, true);
 167
 168     /*
 169      * here position 0 has <arch>/<machine>, position 1 has <machine>.
 170      * The path must not have the <arch>, qtest_add_data_func adds it.
 171      */
 172     path_str = g_strjoinv("/", path_vec + 1);
 173
 174     /* Check that this is the test we care about: */
 175     char *test_name = strrchr(path_str, '/') + 1;
 176     if (strcmp(test_name, fuzz_target_name) == 0) {
 177         /*
 178          * put arch/machine in position 1 so run_one_test can do its work
 179          * and add the command line at position 0.
 180          */
 181         path_vec[1] = path_vec[0];
 182         path_vec[0] = g_string_free(cmd_line, false);
 183
 184         fuzz_path_vec = path_vec;
 185     } else {
 186         g_free(path_vec);
 187     }
 188
 189     g_free(path_str);
 190 }
 191
 192 static GString *qos_get_cmdline(FuzzTarget *t)
 193 {
 194     /*
 195      * Set a global variable that we use to identify the qos_path for our
 196      * fuzz_target
 197      */
 198     fuzz_target_name = t->name;
 199     qos_set_machines_devices_available();
 200     qos_graph_foreach_test_path(walk_path);
 201     return qos_build_main_args();
 202 }
 203
 204 void fuzz_add_qos_target(
 205         FuzzTarget *fuzz_opts,
 206         const char *interface,
 207         QOSGraphTestOptions *opts
 208         )
 209 {
 210     qos_add_test(fuzz_opts->name, interface, NULL, opts);
 211     fuzz_opts->get_init_cmdline = qos_get_cmdline;
 212     fuzz_add_target(fuzz_opts);
 213 }
 214
 215 void qos_init_path(QTestState *s)
 216 {
 217     fuzz_qos_obj = qos_allocate_objects(s , &fuzz_qos_alloc);
 218 }