mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-01 03:53:33 +00:00
933411ba99
- Fix bugs in kDos2Errno definition - malloc() should now be thread safe - Fix bug in rollup.com header generator - Fix open(O_APPEND) on the New Technology - Fix select() on the New Technology and test it - Work towards refactoring i/o for thread safety - Socket reads and writes on NT now poll for signals - Work towards i/o completion ports on the New Technology - Make read() and write() intermittently check for signals - Blinkenlights keyboard i/o so much better on NT w/ poll() - You can now poll() files and sockets at the same time on NT - Fix bug in appendr() that manifests with dlmalloc footers off
107 lines
4.6 KiB
C
107 lines
4.6 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/bits/asmflag.h"
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#include "libc/bits/likely.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/strace.internal.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/intrin/describeflags.internal.h"
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#include "libc/macros.internal.h"
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#include "libc/nt/memory.h"
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#include "libc/nt/thunk/msabi.h"
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#include "libc/runtime/directmap.internal.h"
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#include "libc/runtime/memtrack.internal.h"
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#include "libc/sysv/consts/nr.h"
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#include "libc/sysv/consts/prot.h"
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#include "libc/sysv/errfuns.h"
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__msabi extern typeof(VirtualProtect) *const __imp_VirtualProtect;
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#define ADDR(x) ((char *)((int64_t)((uint64_t)(x) << 32) >> 16))
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/**
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* Modifies restrictions on virtual memory address range.
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*
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* @param addr needs to be 4kb aligned
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* @param prot can have PROT_{NONE,READ,WRITE,EXEC,GROWSDOWN,GROWSUP}
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* @return 0 on success, or -1 w/ errno
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* @see mmap()
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*/
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noasan noubsan privileged int mprotect(void *addr, size_t size, int prot) {
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bool cf;
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int64_t rc;
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unsigned i;
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uint32_t op;
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char *a, *b, *x, *y, *p;
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if (SupportsWindows() && (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC |
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PROT_GROWSDOWN | PROT_GROWSUP))) {
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rc = einval(); // unix checks prot before checking size
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} else if (!size) {
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return 0; // make new technology consistent with unix
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} else if (UNLIKELY((intptr_t)addr & 4095)) {
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rc = einval();
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} else if (!IsWindows()) {
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asm volatile(CFLAG_ASM("clc\n\tsyscall")
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: CFLAG_CONSTRAINT(cf), "=a"(rc)
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: "1"(__NR_mprotect), "D"(addr), "S"(size), "d"(prot)
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: "rcx", "r11", "memory", "cc");
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if (cf) {
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errno = rc;
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rc = -1;
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} else if (rc > -4096ul) {
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errno = -rc;
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rc = -1;
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}
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} else {
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rc = 0;
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p = addr;
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i = FindMemoryInterval(&_mmi, (intptr_t)p >> 16);
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if (i == _mmi.i || (!i && p + size <= ADDR(_mmi.p[0].x))) {
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// memory isn't in memtrack
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// let's just trust the user then
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// it's probably part of the executable
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if (!VirtualProtect(addr, size, __prot2nt(prot, false), &op)) {
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rc = -1;
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}
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} else {
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// memory is in memtrack, so use memtrack, to do dimensioning
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// we unfortunately must do something similar to this for cow
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for (; i < _mmi.i; ++i) {
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x = ADDR(_mmi.p[i].x);
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y = x + _mmi.p[i].size;
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if ((x <= p && p < y) || (x < p + size && p + size <= y) ||
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(p < x && y < p + size)) {
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a = MIN(MAX(p, x), y);
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b = MAX(MIN(p + size, y), x);
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if (!VirtualProtect(a, b - a, __prot2nt(prot, _mmi.p[i].iscow),
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&op)) {
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rc = -1;
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break;
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}
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} else {
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break;
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}
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}
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}
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}
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STRACE("mprotect(%p, %'zu, %s) → %d% m", addr, size, DescribeProtFlags(prot),
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rc);
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return rc;
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}
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