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https://github.com/jart/cosmopolitan.git
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1ff9ab95ac
This change enables Address Sanitizer systemically w/ `make MODE=dbg`. Our version of Rust's `unsafe` keyword is named `noasan` which is used for two functions that do aligned memory chunking, like `strcpy.c` and we need to fix the tiny DEFLATE code, but that's it everything else is fabulous you can have all the fischer price security blankets you need Best of all is we're now able to use the ASAN data in Blinkenlights to colorize the memory dumps. See the screenshot below of a test program: https://justine.lol/blinkenlights/asan.png Which is operating on float arrays stored on the stack, with red areas indicating poisoned memory, and the green areas indicate valid memory.
100 lines
4.8 KiB
C
100 lines
4.8 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/bits/weaken.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/dce.h"
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#include "libc/intrin/asan.internal.h"
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#include "libc/macros.h"
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#include "libc/rand/rand.h"
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#include "libc/runtime/directmap.h"
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#include "libc/runtime/memtrack.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/prot.h"
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#include "libc/sysv/errfuns.h"
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#define IP(X) (intptr_t)(X)
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#define VIP(X) (void *)IP(X)
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#define ADDR(c) (void *)(IP(c) << 16)
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#define ALIGNED(p) (!(IP(p) & (FRAMESIZE - 1)))
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#define CANONICAL(p) (-0x800000000000 <= IP(p) && IP(p) <= 0x7fffffffffff)
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/**
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* Beseeches system for page-table entries.
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*
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* char *p = mmap(NULL, 65536, PROT_READ | PROT_WRITE,
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* MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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* munmap(p, 65536);
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*
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* @param addr optionally requests a particular virtual base address,
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* which needs to be 64kb aligned if passed (for NT compatibility)
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* @param size must be >0 and needn't be a multiple of FRAMESIZE
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* @param prot can have PROT_READ, PROT_WRITE, PROT_EXEC, PROT_NONE, etc.
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* @param flags can have MAP_ANONYMOUS, MAP_SHARED, MAP_PRIVATE, etc.
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* @param fd is an open()'d file descriptor whose contents shall be
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* mapped, and is ignored if MAP_ANONYMOUS is specified
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* @param offset specifies absolute byte index of fd's file for mapping,
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* and should be zero if MAP_ANONYMOUS is specified
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* @return virtual base address of new mapping, or MAP_FAILED w/ errno
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*/
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void *mmap(void *addr, size_t size, int prot, int flags, int fd, int64_t off) {
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int i, x, n, a, b;
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struct DirectMap dm;
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if (!size) return VIP(einval());
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if (!ALIGNED(off)) return VIP(einval());
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if (!ALIGNED(addr)) return VIP(einval());
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if (!CANONICAL(addr)) return VIP(einval());
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if (!(!!(flags & MAP_ANONYMOUS) ^ (fd != -1))) return VIP(einval());
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if (!(!!(flags & MAP_PRIVATE) ^ !!(flags & MAP_SHARED))) return VIP(einval());
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if (fd == -1) size = ROUNDUP(size, FRAMESIZE);
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if (IsWindows() && fd == -1) prot |= PROT_WRITE;
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if (flags & MAP_FIXED) {
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if (UntrackMemoryIntervals(addr, size) == -1) {
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return MAP_FAILED;
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}
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} else {
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x = kAutomapStart >> 16;
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n = ROUNDUP(size, FRAMESIZE) >> 16;
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for (i = 0; i < _mmi.i; ++i) {
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if (_mmi.p[i].y < x) continue;
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if (_mmi.p[i].x > x + n - 1) break;
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x = _mmi.p[i].y + 1;
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}
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if (x + n - 1 >= ((kAutomapStart + kAutomapSize) >> 16)) {
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return (void *)(intptr_t)enomem();
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}
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addr = (void *)(intptr_t)((int64_t)x << 16);
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}
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dm = __mmap(addr, size, prot, flags | MAP_FIXED, fd, off);
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if (dm.addr == MAP_FAILED || dm.addr != addr) {
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return MAP_FAILED;
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}
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a = ROUNDDOWN((intptr_t)addr, FRAMESIZE) >> 16;
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b = ROUNDDOWN((intptr_t)addr + size - 1, FRAMESIZE) >> 16;
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if (TrackMemoryInterval(&_mmi, a, b, dm.maphandle, prot, flags) == -1) {
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abort();
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}
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if (weaken(__asan_map_shadow)) {
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weaken(__asan_map_shadow)((uintptr_t)dm.addr, size);
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}
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return dm.addr;
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}
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