add basic supprt for qbdi_mode, test x86_64 Linux
ADD
qbdi_mode/build.sh
+# ~/workspace/android-standalone-toolchain-21-x86/bin/i686-linux-android-g++ -o loader -Wl,-rpath,/data/lsl template.cpp -Iusr/local/include/ -Lusr/local/lib/ -lQBDI
+# ~/workspace/android-standalone-toolchain-21-x86/bin/i686-linux-android-gcc -shared -o libdemo.so demo-so.c -w
+
+
+g++ -o loader template.cpp -lQBDI -ldl -w
+gcc -shared -o libdemo.so demo-so.c -w
\ No newline at end of file

ADD
qbdi_mode/demo-so.c
+#include <stdio.h>
+
+
+
+// gcc -shared -o libdemo.so demo-so.c -w
+
+
+int target_func(char* buf, int size){
+
+ printf("buffer:%p, size:%p\n", buf, size);
+
+ switch (buf[0])
+ {
+ case 1:
+ puts("222");
+ if(buf[1]=='\x44'){
+ puts("xxxiiii");
+ }
+ break;
+ case '\xfe':
+ // assert(0);
+ if(buf[4]=='\xf0'){
+ puts("xxxiiii");
+ }
+ break;
+ case 0xff:
+ if(buf[2]=='\xff'){
+ if(buf[1]=='\x44'){
+ puts("xxxiiii");
+ assert(0);
+ }else{
+ puts("xxxiiii");
+ }
+ }
+ puts("xxxx");
+ break;
+ default:
+ puts("xxxxxxx");
+ break;
+ }
+
+ return 1;
+}
+
+
+

ADD
qbdi_mode/template.cpp
+#include <iostream>
+
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <sys/wait.h>
+#include <fcntl.h>
+#include <dlfcn.h>
+
+
+#include <sys/shm.h>
+#include "../config.h"
+
+#include <QBDI.h>
+
+using namespace QBDI;
+
+typedef int (*target_func)(char *buf, int size);
+
+static const size_t STACK_SIZE = 0x100000; // 1MB
+static const QBDI::rword FAKE_RET_ADDR = 0x40000;
+target_func p_target_func = NULL;
+rword module_base = 0;
+rword module_end = 0;
+static unsigned char
+ dummy[MAP_SIZE]; /* costs MAP_SIZE but saves a few instructions */
+unsigned char *afl_area_ptr = NULL; /* Exported for afl_gen_trace */
+
+unsigned long afl_prev_loc = 0;
+
+
+/* Set up SHM region and initialize other stuff. */
+
+int afl_setup(void) {
+ char *id_str = getenv(SHM_ENV_VAR);
+ int shm_id;
+ if (id_str) {
+ shm_id = atoi(id_str);
+ afl_area_ptr = (unsigned char*)shmat(shm_id, NULL, 0);
+ if (afl_area_ptr == (void *)-1)
+ return 0;
+ memset(afl_area_ptr, 0, MAP_SIZE);
+ }
+ return 1;
+}
+
+
+/* Fork server logic, invoked once we hit _start. */
+
+static void afl_forkserver()
+{
+
+ static unsigned char tmp[4];
+ pid_t child_pid;
+
+ if (write(FORKSRV_FD + 1, tmp, 4) != 4)
+ return;
+
+ while (1)
+ {
+
+ int status;
+ u32 was_killed;
+ // wait for afl-fuzz
+ if (read(FORKSRV_FD, &was_killed, 4) != 4)
+ exit(2);
+
+
+ child_pid = fork();
+ if (child_pid < 0)
+ exit(4);
+
+ if (!child_pid)
+ {
+ // child return to execute code
+ close(FORKSRV_FD);
+ close(FORKSRV_FD + 1);
+ return;
+ }
+
+ // write child pid to afl-fuzz
+ if (write(FORKSRV_FD + 1, &child_pid, 4) != 4)
+ exit(5);
+
+ // wait child stop
+ if (waitpid(child_pid, &status, 0) < 0)
+ exit(6);
+
+ // send child stop status to afl-fuzz
+ if (write(FORKSRV_FD + 1, &status, 4) != 4)
+ exit(7);
+ }
+}
+
+void afl_maybe_log(unsigned long cur_loc) {
+ if(afl_area_ptr == NULL){
+ return;
+ }
+ unsigned long afl_idx = cur_loc ^ afl_prev_loc;
+ afl_area_ptr[afl_idx % MAP_SIZE]++;
+ afl_prev_loc = cur_loc >> 1;
+}
+char* read_file(char* path, unsigned long* length) {
+ FILE *pFile = fopen(path, "rb");
+ char *pBuf;
+ fseek(pFile, 0, SEEK_END);
+ unsigned long len = ftell(pFile);
+ pBuf = (char*)malloc(len);
+ rewind(pFile);
+ fread(pBuf, 1, len, pFile);
+ fclose(pFile);
+ *length = len;
+ return pBuf;
+}
+
+char FPATH[200];
+
+QBDI_NOINLINE int fuzz_func()
+{
+
+ if(afl_setup()){
+ afl_forkserver();
+ }
+
+ unsigned long len = 0;
+ char* data = read_file(FPATH, &len);
+
+ printf("In fuzz_func\n");
+ p_target_func(data, len);
+ return 1;
+}
+
+
+
+
+
+
+static QBDI::VMAction bbcallback(QBDI::VMInstanceRef vm, const QBDI::VMState *state, QBDI::GPRState *gprState, QBDI::FPRState *fprState, void *data) {
+ // errno = SAVED_ERRNO;
+
+ unsigned long pc = gprState->rip;
+ // printf("%p\n", pc);
+ if(pc >= module_base && pc <= module_end){
+ unsigned long offset = pc - module_base;
+ printf("\toffset:%p\n", offset);
+ afl_maybe_log(offset);
+ }
+ return QBDI::VMAction::CONTINUE;
+}
+
+int main(int argc, char **argv)
+{
+
+ const char *lib_path;
+ lib_path = argv[1];
+ // FPATH = argv[2];
+ strcpy(FPATH, argv[2]);
+ void *handle = dlopen(lib_path, RTLD_LAZY);
+
+ if (handle == nullptr)
+ {
+ perror("Cannot load library");
+ exit(EXIT_FAILURE);
+ }
+
+ const char *lib_name = lib_path;
+ if (strrchr(lib_name, '/') != nullptr)
+ lib_name = strrchr(lib_name, '/') + 1;
+
+ // printf("library name:%s\n", lib_name);
+
+ for (MemoryMap &map : getCurrentProcessMaps())
+ {
+ // printf("module:%s\n", map.name.c_str());
+ if ((map.permission & PF_EXEC) && strstr(map.name.c_str(), lib_name) != NULL)
+ {
+ module_base = map.range.start;
+ module_end = map.range.end;
+ }
+ }
+
+ if (module_base == 0)
+ {
+ std::cerr << "Fail to find base address" << std::endl;
+ return -1;
+ }
+ // printf("module base:%p, module end:%p\n", module_base, module_end);
+ p_target_func = (target_func)dlsym(handle, "target_func");
+ // p_target_func = (target_func)(module_base + 0x61a);
+ printf("p_target_func:%p\n", p_target_func);
+
+ VM vm;
+ uint8_t *fakestack = nullptr;
+
+ GPRState *state = vm.getGPRState();
+ allocateVirtualStack(state, STACK_SIZE, &fakestack);
+ vm.addInstrumentedModuleFromAddr(module_base);
+ vm.addInstrumentedModuleFromAddr((rword)&main);
+
+
+ vm.addVMEventCB(BASIC_BLOCK_ENTRY, bbcallback, nullptr);
+
+
+ // QBDI::simulateCall(state, FAKE_RET_ADDR);
+ // vm.run((rword)&fuzz_func, (rword)FAKE_RET_ADDR);
+
+ rword ret;
+ vm.call(&ret, (rword)&fuzz_func, {});
+
+ return 0;
+}

add basic supprt for qbdi_mode, test x86_64 Linux