stub_clone_handler(void) { long err; struct stub_data *from = (struct stub_data *) UML_CONFIG_STUB_DATA; err = stub_syscall2(__NR_clone, CLONE_PARENT | CLONE_FILES | SIGCHLD, UML_CONFIG_STUB_DATA + PAGE_SIZE / 2 - sizeof(void *)); if(err != 0) goto out; err = stub_syscall4(__NR_ptrace, PTRACE_TRACEME, 0, 0, 0); if(err) goto out; err = stub_syscall3(__NR_setitimer, ITIMER_VIRTUAL, (long) &from->timer, 0); if(err) goto out; err = stub_syscall6(STUB_MMAP_NR, UML_CONFIG_STUB_DATA, PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_FIXED | MAP_SHARED, from->fd, from->offset); out: /* save current result. Parent: pid; child: retcode of mmap */ from->err = err; trap_myself(); }
stub_clone_handler(void) { struct stub_data *data = (struct stub_data *) STUB_DATA; long err; err = stub_syscall2(__NR_clone, CLONE_PARENT | CLONE_FILES | SIGCHLD, STUB_DATA + UM_KERN_PAGE_SIZE / 2 - sizeof(void *)); if(err != 0) goto out; err = stub_syscall4(__NR_ptrace, PTRACE_TRACEME, 0, 0, 0); if(err) goto out; err = stub_syscall3(__NR_setitimer, ITIMER_VIRTUAL, (long) &data->timer, 0); if(err) goto out; remap_stack(data->fd, data->offset); goto done; out: /* save current result. * Parent: pid; * child: retcode of mmap already saved and it jumps around this * assignment */ data->err = err; done: trap_myself(); }