/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│ │vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│ ╞══════════════════════════════════════════════════════════════════════════════╡ │ Copyright 2020 Justine Alexandra Roberts Tunney │ │ │ │ Permission to use, copy, modify, and/or distribute this software for │ │ any purpose with or without fee is hereby granted, provided that the │ │ above copyright notice and this permission notice appear in all copies. │ │ │ │ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │ │ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │ │ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │ │ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │ │ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │ │ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │ │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │ │ PERFORMANCE OF THIS SOFTWARE. │ ╚─────────────────────────────────────────────────────────────────────────────*/ #include "libc/calls/calls.h" #include "libc/calls/internal.h" #include "libc/calls/struct/fd.internal.h" #include "libc/calls/struct/sigaction.internal.h" #include "libc/fmt/itoa.h" #include "libc/intrin/dll.h" #include "libc/intrin/handlock.internal.h" #include "libc/intrin/weaken.h" #include "libc/nt/accounting.h" #include "libc/nt/console.h" #include "libc/nt/enum/startf.h" #include "libc/nt/enum/status.h" #include "libc/nt/enum/wait.h" #include "libc/nt/errors.h" #include "libc/nt/files.h" #include "libc/nt/memory.h" #include "libc/nt/runtime.h" #include "libc/nt/struct/msg.h" #include "libc/nt/struct/processinformation.h" #include "libc/nt/struct/startupinfo.h" #include "libc/nt/synchronization.h" #include "libc/nt/thread.h" #include "libc/nt/thunk/msabi.h" #include "libc/proc/ntspawn.h" #include "libc/proc/proc.internal.h" #include "libc/runtime/memtrack.internal.h" #include "libc/runtime/runtime.h" #include "libc/sock/sock.h" #include "libc/str/str.h" #include "libc/sysv/consts/o.h" #include "libc/sysv/consts/sig.h" #include "libc/sysv/errfuns.h" #include "libc/thread/itimer.internal.h" #include "libc/thread/posixthread.internal.h" #include "libc/thread/tls.h" #ifdef __x86_64__ #define keywords textwindows dontinstrument // clang-format off __msabi extern typeof(CloseHandle) *const __imp_CloseHandle; __msabi extern typeof(DuplicateHandle) *const __imp_DuplicateHandle; __msabi extern typeof(GenerateConsoleCtrlEvent) *const __imp_GenerateConsoleCtrlEvent; __msabi extern typeof(GetCurrentThreadId) *const __imp_GetCurrentThreadId; __msabi extern typeof(GetExitCodeProcess) *const __imp_GetExitCodeProcess; __msabi extern typeof(GetLastError) *const __imp_GetLastError; __msabi extern typeof(OpenThread) *const __imp_OpenThread; __msabi extern typeof(SetConsoleCtrlHandler) *const __imp_SetConsoleCtrlHandler; __msabi extern typeof(SetHandleInformation) *const __imp_SetHandleInformation; __msabi extern typeof(TerminateThread) *const __imp_TerminateThread; __msabi extern typeof(UnmapViewOfFile) *const __imp_UnmapViewOfFile; __msabi extern typeof(WaitForSingleObject) *const __imp_WaitForSingleObject; // clang-format on extern long __klog_handle; static void sys_execve_nt_relay(intptr_t, long, long, long); void __stack_call(intptr_t, long, long, long, void (*)(intptr_t, intptr_t, long, long), intptr_t) wontreturn; static keywords void PurgeHandle(intptr_t h) { if (!h) return; if (h == -1) return; __imp_CloseHandle(h); } static keywords void PurgeThread(intptr_t h) { if (h && h != -1) { __imp_TerminateThread(h, SIGKILL); __imp_CloseHandle(h); } } static keywords void sys_execve_inherit(int64_t hands[3], bool32 bInherit) { for (int i = 0; i < 3; ++i) { if (hands[i] != -1) { __imp_SetHandleInformation(hands[i], kNtHandleFlagInherit, bInherit); } } } keywords int sys_execve_nt(const char *program, char *const argv[], char *const envp[]) { size_t i; __hand_lock(); pthread_spin_lock(&_pthread_lock); // pass bitmask telling child which fds are sockets int bits; char buf[32], *v = 0; if (_weaken(socket)) { for (bits = i = 0; i < 3; ++i) { if (g_fds.p[i].kind == kFdSocket) { bits |= 1 << i; } } FormatInt32(stpcpy(buf, "__STDIO_SOCKETS="), bits); v = buf; } // define stdio handles for the spawned subprocess struct NtStartupInfo si = { .cb = sizeof(struct NtStartupInfo), .dwFlags = kNtStartfUsestdhandles, }; for (i = 0; i <= 2; ++i) { if (g_fds.p[i].kind != kFdEmpty && // !(g_fds.p[i].flags & O_CLOEXEC)) { si.stdiofds[i] = g_fds.p[i].handle; } else { si.stdiofds[i] = -1; } } // launch the process struct NtProcessInformation pi; sys_execve_inherit(si.stdiofds, true); int rc = ntspawn(program, argv, envp, v, 0, 0, true, 0, 0, &si, &pi); if (rc == -1) { sys_execve_inherit(si.stdiofds, false); __hand_unlock(); if (__imp_GetLastError() == kNtErrorSharingViolation) { return etxtbsy(); } else { return -1; } } PurgeHandle(pi.hThread); // kill siblings struct Dll *e; for (e = dll_first(_pthread_list); e; e = dll_next(_pthread_list, e)) { struct PosixThread *pt = POSIXTHREAD_CONTAINER(e); if ((pthread_t)pt == __get_tls()->tib_pthread) continue; PurgeThread(pt->tib->tib_syshand); PurgeHandle(pt->semaphore); } if (_weaken(__itimer)) { PurgeThread(_weaken(__itimer)->thread); } if (_weaken(__proc)) { PurgeThread(_weaken(__proc)->thread); PurgeHandle(_weaken(__proc)->onstart); } // retreat to original win32-provided stack memory __ftrace = 0; __stack_call(pi.hProcess, 0, 0, 0, sys_execve_nt_relay, __oldstack); } // child is in same process group so wait for it to get killed by this __msabi static keywords bool32 sys_execve_nt_event(uint32_t dwCtrlType) { return true; // tell win32 we handled signal } // this function runs on the original tiny stack that windows gave us // we need to keep the original process alive simply to pass an int32 // so we unmap all memory to avoid getting a double whammy after fork static keywords void sys_execve_nt_relay(intptr_t h, long b, long c, long d) { uint32_t i, dwExitCode; // close more handles __imp_SetConsoleCtrlHandler((void *)sys_execve_nt_event, 1); for (i = 0; i < g_fds.n; ++i) { if (g_fds.p[i].kind != kFdEmpty) { PurgeHandle(g_fds.p[i].handle); if (g_fds.p[i].kind == kFdConsole) { PurgeHandle(g_fds.p[i].extra); } } } // free all the memory mmap created for (i = 0; i < _mmi.i; ++i) { __imp_UnmapViewOfFile((void *)((uintptr_t)_mmi.p[i].x << 16)); PurgeHandle(_mmi.p[i].h); } // wait for process to terminate // // WaitForSingleObject can return kNtWaitAbandoned which MSDN // describes as a "sort of" successful status which indicates // someone else didn't free a mutex and you should check that // persistent resources haven't been left corrupted. not sure // what those resources would be for process objects, however // this status has actually been observed when waiting on 'em do { dwExitCode = 255; if (__imp_WaitForSingleObject(h, -1) != kNtWaitFailed) { __imp_GetExitCodeProcess(h, &dwExitCode); } } while (dwExitCode == kNtStillActive); // propagate child exit status to parent TerminateThisProcess(dwExitCode); } #endif /* __x86_64__ */