mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-06-05 12:12:28 +00:00
4631d34d0d
It's now possible to use sigaltstack() to recover from stack overflows on Windows. Several bugs in sigaltstack() have been fixed, for all our supported platforms. There's a newer better example showing how to use this, along with three independent unit tests just to further showcase the various techniques.
264 lines
10 KiB
C
264 lines
10 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/assert.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/syscall_support-nt.internal.h"
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#include "libc/intrin/bits.h"
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#include "libc/intrin/nomultics.internal.h"
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#include "libc/intrin/weaken.h"
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#include "libc/limits.h"
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#include "libc/log/libfatal.internal.h"
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#include "libc/macros.internal.h"
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#include "libc/nexgen32e/rdtsc.h"
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#include "libc/nt/console.h"
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#include "libc/nt/enum/consolemodeflags.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/files.h"
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#include "libc/nt/memory.h"
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#include "libc/nt/pedef.internal.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/struct/teb.h"
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#include "libc/nt/thunk/msabi.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/stack.h"
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#include "libc/runtime/winargs.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/prot.h"
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#ifdef __x86_64__
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#define abi __msabi textwindows dontinstrument
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// clang-format off
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__msabi extern typeof(CreateFileMapping) *const __imp_CreateFileMappingW;
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__msabi extern typeof(DuplicateHandle) *const __imp_DuplicateHandle;
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__msabi extern typeof(FreeEnvironmentStrings) *const __imp_FreeEnvironmentStringsW;
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__msabi extern typeof(GetConsoleMode) *const __imp_GetConsoleMode;
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__msabi extern typeof(GetCurrentProcessId) *const __imp_GetCurrentProcessId;
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__msabi extern typeof(GetEnvironmentStrings) *const __imp_GetEnvironmentStringsW;
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__msabi extern typeof(GetEnvironmentVariable) *const __imp_GetEnvironmentVariableW;
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__msabi extern typeof(GetFileAttributes) *const __imp_GetFileAttributesW;
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__msabi extern typeof(GetStdHandle) *const __imp_GetStdHandle;
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__msabi extern typeof(MapViewOfFileEx) *const __imp_MapViewOfFileEx;
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__msabi extern typeof(SetConsoleCP) *const __imp_SetConsoleCP;
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__msabi extern typeof(SetConsoleMode) *const __imp_SetConsoleMode;
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__msabi extern typeof(SetConsoleOutputCP) *const __imp_SetConsoleOutputCP;
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__msabi extern typeof(SetEnvironmentVariable) *const __imp_SetEnvironmentVariableW;
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__msabi extern typeof(SetStdHandle) *const __imp_SetStdHandle;
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__msabi extern typeof(VirtualProtect) *const __imp_VirtualProtect;
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// clang-format on
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void cosmo(int, char **, char **, long (*)[2]) wontreturn;
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void __stack_call(int, char **, char **, long (*)[2],
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void (*)(int, char **, char **, long (*)[2]),
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intptr_t) wontreturn;
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static const signed char kNtStdio[3] = {
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(signed char)kNtStdInputHandle,
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(signed char)kNtStdOutputHandle,
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(signed char)kNtStdErrorHandle,
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};
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__funline int IsAlpha(int c) {
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return ('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z');
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}
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// https://nullprogram.com/blog/2022/02/18/
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__funline char16_t *MyCommandLine(void) {
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void *cmd;
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asm("mov\t%%gs:(0x60),%0\n"
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"mov\t0x20(%0),%0\n"
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"mov\t0x78(%0),%0\n"
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: "=r"(cmd));
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return cmd;
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}
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// implements all win32 apis on non-windows hosts
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static abi long __oops_win32(void) {
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notpossible;
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}
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// returns true if utf-8 path is a win32-style path that exists
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static abi bool32 WinFileExists(const char *path) {
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uint16_t path16[PATH_MAX];
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size_t z = ARRAYLEN(path16);
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size_t n = tprecode8to16(path16, z, path).ax;
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if (n >= z - 1) return false;
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return __imp_GetFileAttributesW(path16) != -1u;
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}
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// this ensures close(1) won't accidentally close(2) for example
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static abi void DeduplicateStdioHandles(void) {
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for (long i = 0; i < 3; ++i) {
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int64_t h1 = __imp_GetStdHandle(kNtStdio[i]);
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for (long j = i + 1; j < 3; ++j) {
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int64_t h2 = __imp_GetStdHandle(kNtStdio[j]);
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if (h1 == h2) {
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int64_t h3;
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__imp_DuplicateHandle(-1, h2, -1, &h3, 0, false,
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kNtDuplicateSameAccess);
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__imp_SetStdHandle(kNtStdio[j], h3);
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}
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}
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}
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}
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// main function of windows init process
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// i.e. first process spawned that isn't forked
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static abi wontreturn void WinInit(const char16_t *cmdline) {
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__oldstack = (intptr_t)__builtin_frame_address(0);
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// make console into utf-8 ansi/xterm style tty
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if (NtGetPeb()->OSMajorVersion >= 10 &&
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(intptr_t)v_ntsubsystem == kNtImageSubsystemWindowsCui) {
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__imp_SetConsoleCP(kNtCpUtf8);
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__imp_SetConsoleOutputCP(kNtCpUtf8);
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for (int i = 0; i <= 2; ++i) {
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uint32_t m;
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intptr_t h = __imp_GetStdHandle(kNtStdio[i]);
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if (__imp_GetConsoleMode(h, &m)) {
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if (!i) {
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m |= kNtEnableMouseInput | kNtEnableWindowInput;
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} else {
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m |= kNtEnableVirtualTerminalProcessing;
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}
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__imp_SetConsoleMode(h, m);
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}
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}
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}
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// avoid programs like emacs nagging the user to define this
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char16_t var[8];
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if (!__imp_GetEnvironmentVariableW(u"TERM", var, 8)) {
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__imp_SetEnvironmentVariableW(u"TERM", u"xterm-256color");
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}
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// allocate memory for stack and argument block
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_Static_assert(sizeof(struct WinArgs) % FRAMESIZE == 0, "");
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_mmi.p = _mmi.s;
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_mmi.n = ARRAYLEN(_mmi.s);
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uintptr_t stackaddr = GetStaticStackAddr(0);
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size_t stacksize = GetStaticStackSize();
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__imp_MapViewOfFileEx(
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(_mmi.p[0].h = __imp_CreateFileMappingW(
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-1, 0, kNtPageExecuteReadwrite, stacksize >> 32, stacksize, NULL)),
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kNtFileMapWrite | kNtFileMapExecute, 0, 0, stacksize, (void *)stackaddr);
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int prot = (intptr_t)ape_stack_prot;
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if (~prot & PROT_EXEC) {
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uint32_t old;
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__imp_VirtualProtect((void *)stackaddr, stacksize, kNtPageReadwrite, &old);
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}
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uint32_t oldattr;
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__imp_VirtualProtect((void *)stackaddr, GetGuardSize(),
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kNtPageReadwrite | kNtPageGuard, &oldattr);
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_mmi.p[0].x = stackaddr >> 16;
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_mmi.p[0].y = (stackaddr >> 16) + ((stacksize - 1) >> 16);
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_mmi.p[0].prot = prot;
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_mmi.p[0].flags = 0x00000026; // stack+anonymous
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_mmi.p[0].size = stacksize;
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_mmi.i = 1;
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struct WinArgs *wa =
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(struct WinArgs *)(stackaddr + (stacksize - sizeof(struct WinArgs)));
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// parse utf-16 command into utf-8 argv array in argument block
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int count = GetDosArgv(cmdline, wa->argblock, ARRAYLEN(wa->argblock),
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wa->argv, ARRAYLEN(wa->argv));
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// normalize executable path
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if (wa->argv[0] && !WinFileExists(wa->argv[0])) {
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unsigned i, n = 0;
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while (wa->argv[0][n]) ++n;
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if (n + 4 < sizeof(wa->argv0buf)) {
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for (i = 0; i < n; ++i) {
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wa->argv0buf[i] = wa->argv[0][i];
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}
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WRITE32LE(wa->argv0buf + i, READ32LE(".com"));
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if (WinFileExists(wa->argv0buf)) {
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wa->argv[0] = wa->argv0buf;
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}
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}
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}
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// munge argv so dos paths become cosmo paths
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for (int i = 0; wa->argv[i]; ++i) {
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if (wa->argv[i][0] == '\\' && //
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wa->argv[i][1] == '\\') {
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// don't munge new technology style paths
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continue;
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}
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if (!WinFileExists(wa->argv[i])) {
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// don't munge if we're not certain it's a file
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continue;
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}
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// use forward slashes
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for (int j = 0; wa->argv[i][j]; ++j) {
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if (wa->argv[i][j] == '\\') {
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wa->argv[i][j] = '/';
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}
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}
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// turn c:/... into /c/...
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if (IsAlpha(wa->argv[i][0]) && //
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wa->argv[i][1] == ':' && //
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wa->argv[i][2] == '/') {
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wa->argv[i][1] = wa->argv[i][0];
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wa->argv[i][0] = '/';
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}
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}
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// translate utf-16 win32 environment into utf-8 environment variables
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char16_t *env16 = __imp_GetEnvironmentStringsW();
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GetDosEnviron(env16, wa->envblock, ARRAYLEN(wa->envblock) - 8, wa->envp,
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ARRAYLEN(wa->envp) - 1);
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__imp_FreeEnvironmentStringsW(env16);
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__envp = &wa->envp[0];
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// handover control to cosmopolitan runtime
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__stack_call(count, wa->argv, wa->envp, wa->auxv, cosmo,
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stackaddr + (stacksize - sizeof(struct WinArgs)));
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}
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abi int64_t WinMain(int64_t hInstance, int64_t hPrevInstance,
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const char *lpCmdLine, int64_t nCmdShow) {
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const char16_t *cmdline;
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extern char os asm("__hostos");
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os = _HOSTWINDOWS; // madness https://news.ycombinator.com/item?id=21019722
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kStartTsc = rdtsc();
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__umask = 077;
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__pid = __imp_GetCurrentProcessId();
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cmdline = MyCommandLine();
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#ifdef SYSDEBUG
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// sloppy flag-only check for early initialization
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if (__strstr16(cmdline, u"--strace")) ++__strace;
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#endif
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if (_weaken(WinSockInit)) {
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_weaken(WinSockInit)();
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}
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DeduplicateStdioHandles();
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if (_weaken(WinMainForked)) {
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_weaken(WinMainForked)();
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}
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WinInit(cmdline);
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}
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#endif /* __x86_64__ */
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