mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-03-03 15:38:22 +00:00
a359de7893
This changes *NSYNC to allocate waiters on the stack so our locks don't need to depend on dynamic memory. This make our runtiem simpler, and it also fixes bugs with thread cancellation support.
432 lines
15 KiB
C
432 lines
15 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/internal.h"
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#include "libc/calls/ntspawn.h"
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#include "libc/calls/state.internal.h"
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#include "libc/calls/syscall-nt.internal.h"
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#include "libc/calls/syscall_support-nt.internal.h"
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#include "libc/calls/wincrash.internal.h"
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#include "libc/errno.h"
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#include "libc/fmt/itoa.h"
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#include "libc/intrin/atomic.h"
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#include "libc/intrin/directmap.internal.h"
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#include "libc/intrin/kprintf.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/intrin/weaken.h"
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#include "libc/macros.internal.h"
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#include "libc/mem/alloca.h"
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#include "libc/mem/mem.h"
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#include "libc/nexgen32e/nt2sysv.h"
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#include "libc/nt/console.h"
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#include "libc/nt/createfile.h"
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#include "libc/nt/enum/accessmask.h"
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#include "libc/nt/enum/creationdisposition.h"
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#include "libc/nt/enum/fileflagandattributes.h"
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#include "libc/nt/enum/filemapflags.h"
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#include "libc/nt/enum/pageflags.h"
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#include "libc/nt/enum/processcreationflags.h"
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#include "libc/nt/enum/startf.h"
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#include "libc/nt/errors.h"
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#include "libc/nt/ipc.h"
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#include "libc/nt/memory.h"
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#include "libc/nt/process.h"
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#include "libc/nt/runtime.h"
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#include "libc/nt/signals.h"
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#include "libc/nt/struct/ntexceptionpointers.h"
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#include "libc/nt/synchronization.h"
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#include "libc/runtime/internal.h"
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#include "libc/runtime/memtrack.internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/runtime/symbols.internal.h"
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#include "libc/sock/internal.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/limits.h"
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#include "libc/sysv/consts/map.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/consts/prot.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/thread/tls.h"
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#ifdef __x86_64__
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extern int64_t __wincrashearly;
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bool32 __onntconsoleevent(uint32_t);
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void sys_setitimer_nt_reset(void);
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static textwindows wontreturn void AbortFork(const char *func) {
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#ifdef SYSDEBUG
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kprintf("fork() %s() failed with win32 error %d\n", func, GetLastError());
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#endif
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ExitProcess(11);
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}
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static textwindows char16_t *ParseInt(char16_t *p, int64_t *x) {
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*x = 0;
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while (*p == ' ') p++;
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while ('0' <= *p && *p <= '9') {
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*x *= 10;
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*x += *p++ - '0';
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}
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return p;
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}
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static inline textwindows ssize_t ForkIo(int64_t h, char *p, size_t n,
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bool32 (*f)()) {
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size_t i;
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uint32_t x;
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for (i = 0; i < n; i += x) {
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if (!f(h, p + i, n - i, &x, NULL)) {
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return __winerr();
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}
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}
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return i;
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}
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static dontinline textwindows bool ForkIo2(int64_t h, void *buf, size_t n,
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bool32 (*fn)(), const char *sf,
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bool ischild) {
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ssize_t rc = ForkIo(h, buf, n, fn);
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if (ischild) __tls_enabled_set(false); // prevent tls crash in kprintf
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NTTRACE("%s(%ld, %p, %'zu) → %'zd% m", sf, h, buf, n, rc);
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return rc != -1;
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}
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static dontinline textwindows bool WriteAll(int64_t h, void *buf, size_t n) {
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bool ok;
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// kprintf("WriteAll(%ld, %p, %zu);\n", h, buf, n);
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ok = ForkIo2(h, buf, n, WriteFile, "WriteFile", false);
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#ifndef NDEBUG
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if (ok) ok = ForkIo2(h, &n, sizeof(n), WriteFile, "WriteFile", false);
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#endif
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#ifdef SYSDEBUG
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if (!ok) {
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kprintf("failed to write %zu bytes to forked child: %d\n", n,
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GetLastError());
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}
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#endif
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// Sleep(10);
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return ok;
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}
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static textwindows dontinline void ReadOrDie(int64_t h, void *buf, size_t n) {
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// kprintf("ReadOrDie(%ld, %p, %zu);\n", h, buf, n);
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if (!ForkIo2(h, buf, n, ReadFile, "ReadFile", true)) {
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AbortFork("ReadFile1");
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}
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#ifndef NDEBUG
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size_t got;
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if (!ForkIo2(h, &got, sizeof(got), ReadFile, "ReadFile", true)) {
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AbortFork("ReadFile2");
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}
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if (got != n) {
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AbortFork("ReadFile_SIZE_CHECK");
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}
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#endif
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// Sleep(10);
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}
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static textwindows int64_t MapOrDie(uint32_t prot, uint64_t size) {
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int64_t h;
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for (;;) {
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if ((h = CreateFileMapping(-1, 0, prot, size >> 32, size, 0))) {
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return h;
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}
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if (GetLastError() == kNtErrorAccessDenied) {
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switch (prot) {
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case kNtPageExecuteWritecopy:
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prot = kNtPageWritecopy;
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continue;
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case kNtPageExecuteReadwrite:
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prot = kNtPageReadwrite;
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continue;
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case kNtPageExecuteRead:
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prot = kNtPageReadonly;
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continue;
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default:
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break;
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}
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}
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AbortFork("MapOrDie");
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}
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}
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static textwindows void ViewOrDie(int64_t h, uint32_t access, size_t pos,
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size_t size, void *base) {
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TryAgain:
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if (!MapViewOfFileEx(h, access, pos >> 32, pos, size, base)) {
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if ((access & kNtFileMapExecute) &&
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GetLastError() == kNtErrorAccessDenied) {
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access &= ~kNtFileMapExecute;
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goto TryAgain;
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}
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AbortFork("ViewOrDie");
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}
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}
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static textwindows int OnForkCrash(struct NtExceptionPointers *ep) {
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kprintf("error: fork() child crashed!%n"
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"\tExceptionCode = %#x%n"
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"\tRip = %x%n",
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ep->ExceptionRecord->ExceptionCode,
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ep->ContextRecord ? ep->ContextRecord->Rip : -1);
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ExitProcess(11);
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}
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textwindows void WinMainForked(void) {
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jmp_buf jb;
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int64_t reader;
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int64_t savetsc;
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char *addr, *shad;
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uint64_t size, upsize;
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struct MemoryInterval *maps;
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char16_t fvar[21 + 1 + 21 + 1];
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uint32_t i, varlen, oldprot, savepid;
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long mapcount, mapcapacity, specialz;
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struct StdinRelay stdin;
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struct Fds *fds = __veil("r", &g_fds);
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stdin = fds->stdin;
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// check to see if the process was actually forked
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// this variable should have the pipe handle numba
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varlen = GetEnvironmentVariable(u"_FORK", fvar, ARRAYLEN(fvar));
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if (!varlen || varlen >= ARRAYLEN(fvar)) return;
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NTTRACE("WinMainForked()");
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SetEnvironmentVariable(u"_FORK", NULL);
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#ifdef SYSDEBUG
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int64_t oncrash = AddVectoredExceptionHandler(1, NT2SYSV(OnForkCrash));
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#endif
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ParseInt(fvar, &reader);
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// read the cpu state from the parent process & plus
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// read the list of mappings from the parent process
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// this is stored in a special secretive memory map!
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// read ExtendMemoryIntervals for further details :|
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maps = (void *)kMemtrackStart;
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ReadOrDie(reader, jb, sizeof(jb));
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ReadOrDie(reader, &mapcount, sizeof(_mmi.i));
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ReadOrDie(reader, &mapcapacity, sizeof(_mmi.n));
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specialz = ROUNDUP(mapcapacity * sizeof(_mmi.p[0]), kMemtrackGran);
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ViewOrDie(MapOrDie(kNtPageReadwrite, specialz), kNtFileMapWrite, 0, specialz,
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maps);
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ReadOrDie(reader, maps, mapcount * sizeof(_mmi.p[0]));
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if (IsAsan()) {
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shad = (char *)(((intptr_t)maps >> 3) + 0x7fff8000);
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size = ROUNDUP(specialz >> 3, FRAMESIZE);
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ViewOrDie(MapOrDie(kNtPageReadwrite, size), kNtFileMapWrite, 0, size, maps);
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ReadOrDie(reader, shad, (mapcount * sizeof(_mmi.p[0])) >> 3);
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}
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// read the heap mappings from the parent process
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for (i = 0; i < mapcount; ++i) {
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addr = (char *)((uint64_t)maps[i].x << 16);
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size = maps[i].size;
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if ((maps[i].flags & MAP_TYPE) != MAP_SHARED) {
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upsize = ROUNDUP(size, FRAMESIZE);
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// we don't need to close the map handle because sys_mmap_nt
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// doesn't mark it inheritable across fork() for MAP_PRIVATE
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ViewOrDie((maps[i].h = MapOrDie(kNtPageExecuteReadwrite, upsize)),
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kNtFileMapWrite | kNtFileMapExecute, 0, upsize, addr);
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ReadOrDie(reader, addr, size);
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} else {
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// we can however safely inherit MAP_SHARED with zero copy
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ViewOrDie(maps[i].h,
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maps[i].readonlyfile ? kNtFileMapRead | kNtFileMapExecute
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: kNtFileMapWrite | kNtFileMapExecute,
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maps[i].offset, size, addr);
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}
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}
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// read the .data and .bss program image sections
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savepid = __pid;
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savetsc = kStartTsc;
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ReadOrDie(reader, __data_start, __data_end - __data_start);
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ReadOrDie(reader, __bss_start, __bss_end - __bss_start);
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__pid = savepid;
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kStartTsc = savetsc;
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__threaded = false;
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__tls_index = 0;
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__tls_enabled_set(false);
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// apply fixups and reapply memory protections
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_mmi.p = maps;
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_mmi.n = specialz / sizeof(_mmi.p[0]);
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for (i = 0; i < mapcount; ++i) {
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if (!VirtualProtect((void *)((uint64_t)maps[i].x << 16), maps[i].size,
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__prot2nt(maps[i].prot, maps[i].iscow), &oldprot)) {
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AbortFork("VirtualProtect");
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}
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}
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// mitosis complete
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if (!CloseHandle(reader)) {
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AbortFork("CloseHandle");
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}
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// rewrap the stdin named pipe hack
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// since the handles closed on fork
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fds->stdin = stdin;
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fds->p[0].handle = GetStdHandle(kNtStdInputHandle);
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fds->p[1].handle = GetStdHandle(kNtStdOutputHandle);
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fds->p[2].handle = GetStdHandle(kNtStdErrorHandle);
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// untrack children of parent since we specify with both
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// CreateProcess() and CreateThread() as non-inheritable
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for (i = 0; i < fds->n; ++i) {
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if (fds->p[i].kind == kFdProcess) {
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fds->p[i].kind = 0;
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atomic_store_explicit(&fds->f, MIN(i, fds->f), memory_order_relaxed);
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}
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}
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// restore the crash reporting stuff
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#ifdef SYSDEBUG
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RemoveVectoredExceptionHandler(oncrash);
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#endif
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if (_weaken(__wincrash)) {
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if (!IsTiny()) {
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RemoveVectoredExceptionHandler(__wincrashearly);
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}
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AddVectoredExceptionHandler(1, (void *)_weaken(__wincrash));
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}
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if (_weaken(__onntconsoleevent)) {
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SetConsoleCtrlHandler(_weaken(__onntconsoleevent), 1);
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}
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// jump back into function below
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longjmp(jb, 1);
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}
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textwindows int sys_fork_nt(uint32_t dwCreationFlags) {
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jmp_buf jb;
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uint32_t op;
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char **args;
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char ok, threaded;
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struct CosmoTib *tib;
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char16_t pipename[64];
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int64_t reader, writer;
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struct NtStartupInfo startinfo;
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int i, pid, untrackpid, rc = -1;
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char *p, forkvar[6 + 21 + 1 + 21 + 1];
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struct NtProcessInformation procinfo;
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threaded = __threaded;
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tib = __tls_enabled ? __get_tls() : 0;
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if (!setjmp(jb)) {
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pid = untrackpid = __reservefd_unlocked(-1);
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reader = CreateNamedPipe(__create_pipe_name(pipename), kNtPipeAccessInbound,
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kNtPipeTypeByte | kNtPipeReadmodeByte, 1, PIPE_BUF,
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PIPE_BUF, 0, &kNtIsInheritable);
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writer = CreateFile(pipename, kNtGenericWrite, 0, 0, kNtOpenExisting, 0, 0);
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if (pid != -1 && reader != -1 && writer != -1) {
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p = stpcpy(forkvar, "_FORK=");
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p = FormatUint64(p, reader);
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bzero(&startinfo, sizeof(startinfo));
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startinfo.cb = sizeof(struct NtStartupInfo);
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startinfo.dwFlags = kNtStartfUsestdhandles;
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startinfo.hStdInput = __getfdhandleactual(0);
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startinfo.hStdOutput = __getfdhandleactual(1);
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startinfo.hStdError = __getfdhandleactual(2);
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args = __argv;
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#ifdef SYSDEBUG
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// If --strace was passed to this program, then propagate it the
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// forked process since the flag was removed by __intercept_flag
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if (strace_enabled(0) > 0) {
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int n;
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char **args2;
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for (n = 0; args[n];) ++n;
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args2 = alloca((n + 2) * sizeof(char *));
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for (i = 0; i < n; ++i) args2[i] = args[i];
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args2[i++] = "--strace";
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args2[i] = 0;
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args = args2;
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}
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#endif
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if (ntspawn(GetProgramExecutableName(), args, environ, forkvar, 0, 0,
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true, dwCreationFlags, 0, &startinfo, &procinfo) != -1) {
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CloseHandle(procinfo.hThread);
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ok = WriteAll(writer, jb, sizeof(jb)) &&
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WriteAll(writer, &_mmi.i, sizeof(_mmi.i)) &&
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WriteAll(writer, &_mmi.n, sizeof(_mmi.n)) &&
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WriteAll(writer, _mmi.p, _mmi.i * sizeof(_mmi.p[0]));
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if (IsAsan() && ok) {
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ok = WriteAll(writer, (char *)(((intptr_t)_mmi.p >> 3) + 0x7fff8000),
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(_mmi.i * sizeof(_mmi.p[0])) >> 3);
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}
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for (i = 0; i < _mmi.i && ok; ++i) {
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if ((_mmi.p[i].flags & MAP_TYPE) != MAP_SHARED) {
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char *p = (char *)((uint64_t)_mmi.p[i].x << 16);
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// XXX: forking destroys thread guard pages currently
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VirtualProtect(
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p, _mmi.p[i].size,
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__prot2nt(_mmi.p[i].prot | PROT_READ, _mmi.p[i].iscow), &op);
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ok = WriteAll(writer, p, _mmi.p[i].size);
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}
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}
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if (ok) ok = WriteAll(writer, __data_start, __data_end - __data_start);
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if (ok) ok = WriteAll(writer, __bss_start, __bss_end - __bss_start);
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if (ok) {
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if (!CloseHandle(writer)) ok = false;
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writer = -1;
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}
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if (ok) {
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g_fds.p[pid].kind = kFdProcess;
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g_fds.p[pid].handle = procinfo.hProcess;
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g_fds.p[pid].flags = O_CLOEXEC;
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g_fds.p[pid].zombie = false;
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untrackpid = -1;
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rc = pid;
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} else {
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TerminateProcess(procinfo.hProcess, 9);
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CloseHandle(procinfo.hProcess);
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}
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}
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}
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if (reader != -1) CloseHandle(reader);
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if (writer != -1) CloseHandle(writer);
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if (rc == -1 && errno != ENOMEM) {
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eagain(); // posix fork() only specifies two errors
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}
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} else {
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rc = 0;
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// re-apply code morphing for thread-local storage
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if (tib && _weaken(__set_tls) && _weaken(__morph_tls)) {
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_weaken(__set_tls)(tib);
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_weaken(__morph_tls)();
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__tls_enabled_set(true);
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}
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// re-apply code morphing for synchronization nops
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if (threaded && !__threaded && _weaken(__enable_threads)) {
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_weaken(__enable_threads)();
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}
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// re-apply code morphing for function tracing
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if (ftrace_stackdigs) {
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_weaken(__hook)(_weaken(ftrace_hook), _weaken(GetSymbolTable)());
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}
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// reset alarms
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if (_weaken(sys_setitimer_nt_reset)) {
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_weaken(sys_setitimer_nt_reset)();
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}
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}
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if (untrackpid != -1) {
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__releasefd(untrackpid);
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}
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return rc;
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}
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#endif /* __x86_64__ */
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