mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-06-28 07:18:30 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

Make improvements

Browse source 
- Expand redbean UNIX module
- Expand redbean documentation
- Ensure Lua copyright is embedded in binary
- Increase the PATH_MAX limit especially on NT
- Use column major sorting for linenoise completions
- Fix some suboptimalities in redbean's new UNIX API
- Figured out right flags for Multics newline in raw mode
This commit is contained in:
Justine Tunney 2022-04-24 09:59:22 -07:00
parent cf3174dc74
commit 2046c0d2ae
305 changed files with 6602 additions and 4221 deletions
Download patch file Download diff file Expand all files Collapse all files

63
libc/runtime/mprotect-nt.greg.c Normal file
View file

@ -0,0 +1,63 @@
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2022 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/intrin/spinlock.h"
#include "libc/nt/memory.h"
#include "libc/runtime/directmap.internal.h"
#include "libc/runtime/internal.h"
#include "libc/runtime/memtrack.internal.h"
#define ADDR(x) ((char *)((int64_t)((uint64_t)(x) << 32) >> 16))
privileged int sys_mprotect_nt(void *addr, size_t size, int prot) {
int rc = 0;
unsigned i;
uint32_t op;
char *a, *b, *x, *y, *p;
_spinlock(&_mmi.lock);
p = addr;
i = FindMemoryInterval(&_mmi, (intptr_t)p >> 16);
if (i == _mmi.i || (!i && p + size <= ADDR(_mmi.p[0].x))) {
// memory isn't in memtrack
// let's just trust the user then
// it's probably part of the executable
if (!VirtualProtect(addr, size, __prot2nt(prot, false), &op)) {
rc = -1;
}
} else {
// memory is in memtrack, so use memtrack, to do dimensioning
// we unfortunately must do something similar to this for cow
for (; i < _mmi.i; ++i) {
x = ADDR(_mmi.p[i].x);
y = x + _mmi.p[i].size;
if ((x <= p && p < y) || (x < p + size && p + size <= y) ||
(p < x && y < p + size)) {
a = MIN(MAX(p, x), y);
b = MAX(MIN(p + size, y), x);
if (!VirtualProtect(a, b - a, __prot2nt(prot, _mmi.p[i].iscow), &op)) {
rc = -1;
break;
}
} else {
break;
}
}
}
_spunlock(&_mmi.lock);
return rc;
}