mirror of
https://github.com/jart/cosmopolitan.git
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155b378a39
The organization of the source files is now much more rational. Old experiments that didn't work out are now deleted. Naming of things like files is now more intuitive.
346 lines
12 KiB
C
346 lines
12 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/strace.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/fmt/itoa.h"
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#include "libc/intrin/kprintf.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/thread/tls.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/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/runtime/directmap.internal.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/str/str.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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STATIC_YOINK("_check_sigchld");
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extern int64_t __wincrashearly;
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bool32 __onntconsoleevent_nt(uint32_t);
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static textwindows wontreturn void AbortFork(const char *func) {
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STRACE("fork() %s() failed %d", func, GetLastError());
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ExitProcess(177);
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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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ssize_t rc = ForkIo(h, buf, n, fn);
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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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return ForkIo2(h, buf, n, WriteFile, "WriteFile");
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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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__tls_enabled = false; // prevent tls crash in kprintf
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if (!ForkIo2(h, buf, n, ReadFile, "ReadFile")) {
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AbortFork("ReadFile");
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}
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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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if ((h = CreateFileMapping(-1, 0, prot, size >> 32, size, 0))) {
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return h;
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} else {
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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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void *got;
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got = MapViewOfFileEx(h, access, pos >> 32, pos, size, base);
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if (!got || (base && got != base)) {
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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(73);
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}
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textwindows void WinMainForked(void) {
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bool ok;
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jmp_buf jb;
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int64_t reader;
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char *addr, *shad;
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struct DirectMap dm;
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uint64_t size, upsize;
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int64_t oncrash, savetsc;
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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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// 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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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 = 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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// turn tls back on
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__enable_tls();
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// rewrap the stdin named pipe hack
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// since the handles closed on fork
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struct Fds *fds = VEIL("r", &g_fds);
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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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fds->f = MIN(i, fds->f);
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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_nt)) {
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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_nt));
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}
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if (weaken(__onntconsoleevent_nt)) {
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SetConsoleCtrlHandler(weaken(__onntconsoleevent_nt), 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(void) {
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bool ok;
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jmp_buf jb;
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uint32_t oldprot;
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char **args, **args2;
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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, n, 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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if (!setjmp(jb)) {
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pid = untrackpid = __reservefd(-1);
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reader = CreateNamedPipe(CreatePipeName(pipename),
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kNtPipeAccessInbound | kNtFileFlagOverlapped,
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kNtPipeTypeMessage | kNtPipeReadmodeMessage, 1,
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65536, 65536, 0, &kNtIsInheritable);
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writer = CreateFile(pipename, kNtGenericWrite, 0, 0, kNtOpenExisting,
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kNtFileFlagOverlapped, 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 > 0) {
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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, 0, 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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ok = WriteAll(writer, (void *)((uint64_t)_mmi.p[i].x << 16),
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_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, 127);
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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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} else {
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rc = 0;
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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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