/**
* Handle syscalls that take a path as the first parameter
*/
static void _handle_file_series_syscalls(pid_t pid, char* syscall, int flag, uid_t uid, gid_t gid)
{
// TODO
tracee_ptr_t path_ptr = (tracee_ptr_t) ptrace_get_syscall_arg(pid, 0);
int len = ptrace_strlen(pid, path_ptr);
char path[len + 1];
ptrace_read_data(pid, path, path_ptr, len + 1);
#if 0
int nth_dir;
if ((flag & SANDBOX_CHROOT_PRIVATE_FOLDER) && (nth_dir = check_prefix_dir(path,SANDBOX_PATH_INTERNAL)) > 0) {
//internal file storage sandbox
char* sub_dir = get_nth_dir(path, nth_dir + 2);
if (!check_prefix(sub_dir, SANDBOX_PATH_INTERNAL_EXCLUDE)) {
char new_path[len + 1];
//replace dir in path with LINK_PREFIX
char* second_dir = get_nth_dir(path, nth_dir + 1);
strcpy(new_path, SANDBOX_LINK);
strcat(new_path, second_dir);
ptrace_write_data(pid, new_path, path_ptr, len + 1);
// create require folder
create_nth_dir(new_path, 3, uid, gid, 0751);
LOGD("pid %d %s: %s ==> new path: %s", pid, syscall, path, new_path);
// return from open syscall, reset the path
pid = waitpid(pid, NULL, __WALL);
ptrace_write_data(pid, path, path_ptr, len + 1);
long result = ptrace_get_syscall_arg(pid, 0);
LOGD(" = %ld\n", result);
return;
}
/* } else if ((flag & SANDBOX_FLAG) && FILE_SANDBOX_ENABLED && (nth_dir = check_prefix_dir(path,SANDBOX_PATH_EXTERNAL)) > 0) { */
/* //external file storage sandbox */
/* char new_path[len + 1]; */
/* //replace dir in path with LINK_PREFIX */
/* char* second_dir = get_nth_dir(path, nth_dir + 1); */
/* strcpy(new_path, SANDBOX_LINK); */
/* strcat(new_path, second_dir); */
/* ptrace_write_data(pid, new_path, arg0, len + 1); */
/* LOGD("pid %d %s: %s\n ==> new path: %s\n", pid, syscall, path, new_path); */
/* // return from open syscall, reset the path */
/* pid = waitpid(pid, NULL, __WALL); */
/* ptrace_write_data(pid, path, arg0, len + 1); */
/* return; */
}
#endif
LOGD("[%d] %s(%s, ...)\n", pid, syscall, path);
}
static void _handle_syscall_open(sandbox_t *sandbox, pid_t pid)
{
tracee_ptr_t path_ptr = (tracee_ptr_t) ptrace_get_syscall_arg(pid, 0);
int oflag = (int) ptrace_get_syscall_arg(pid, 1);
int len = ptrace_strlen(pid, path_ptr);
char path[len + 1];
ptrace_read_data(pid, path, path_ptr, len + 1);
if (strcmp(path, DEV_BINDER) == 0) {
/* retrieve the fd from the syscall */
// TODO
// sandbox->binder_fd = (int) ptrace_get_syscall_arg(pid , 0);
LOGD("[%d] open binder fd=%d\n", pid, sandbox->binder_fd);
} else {
_handle_file_series_syscalls(pid, "open", sandbox->flag, sandbox->uid, sandbox->gid);
}
}
// read "size" bytes of data from debuggee at address "addr"
ps_err_e ps_pdread(struct ps_prochandle *ph, psaddr_t addr,
void *buf, size_t size) {
bool rslt = ptrace_read_data(ph->pid, (address)addr, buf, size);
return (rslt ? PS_OK : PS_ERR);
}
