void handleSyscall(struct user_regs_struct regs) { long syscall = regs.orig_rax; push_syscall(syscall); // report only after exitting the call if (top_syscall()->status == 2) { // parameters, cf.: // http://www.x86-64.org/documentation/abi.pdf Section A.2.1 switch (syscall) { case __NR_munlockall: init_munlockall(regs); break; case __NR_brk: init_brk(regs); break; case __NR_munlock: init_munlock(regs); break; case __NR_mlock: init_mlock(regs); break; case __NR_munmap: init_munmap(regs); break; case __NR_mlockall:init_mlockall(regs); break; case __NR_mmap: init_mmap(regs); break; case __NR_mprotect: init_mprotect(regs); break; case __NR_msync: init_msync(regs); break; } pop_syscall(); } }
int shim_do_execve_rtld (struct shim_handle * hdl, const char ** argv, const char ** envp) { BEGIN_PROFILE_INTERVAL(); struct shim_thread * cur_thread = get_cur_thread(); int ret; if ((ret = close_cloexec_handle(cur_thread->handle_map)) < 0) return ret; SAVE_PROFILE_INTERVAL(close_CLOEXEC_files_for_exec); void * tcb = malloc(sizeof(__libc_tcb_t)); if (!tcb) return -ENOMEM; populate_tls(tcb); put_handle(cur_thread->exec); get_handle(hdl); cur_thread->exec = hdl; old_stack_top = cur_thread->stack_top; old_stack = cur_thread->stack; old_stack_red = cur_thread->stack_red; cur_thread->stack_top = NULL; cur_thread->stack = NULL; cur_thread->stack_red = NULL; initial_envp = NULL; new_argc = 0; for (const char ** a = argv ; *a ; a++, new_argc++); if ((ret = init_stack(argv, envp, &new_argp, REQUIRED_ELF_AUXV, &new_auxp)) < 0) return ret; SAVE_PROFILE_INTERVAL(alloc_new_stack_for_exec); switch_stack(new_argp); cur_thread = get_cur_thread(); UPDATE_PROFILE_INTERVAL(); DkVirtualMemoryFree(old_stack, old_stack_top - old_stack); DkVirtualMemoryFree(old_stack_red, old_stack - old_stack_red); int flags = VMA_INTERNAL; bkeep_munmap(old_stack, old_stack_top - old_stack, &flags); bkeep_munmap(old_stack_red, old_stack - old_stack_red, &flags); remove_loaded_libraries(); clean_link_map_list(); SAVE_PROFILE_INTERVAL(unmap_loaded_binaries_for_exec); init_brk(); unmap_all_vmas(); SAVE_PROFILE_INTERVAL(unmap_all_vmas_for_exec); if ((ret = load_elf_object(cur_thread->exec, NULL, 0)) < 0) shim_terminate(); load_elf_interp(cur_thread->exec); SAVE_PROFILE_INTERVAL(load_new_executable_for_exec); debug("execve: start execution\n"); execute_elf_object(cur_thread->exec, new_argc, new_argp, REQUIRED_ELF_AUXV, new_auxp); return 0; }