mirror of
https://github.com/jart/cosmopolitan.git
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e466dd0553
This change hardens the code for opening /zip/ files using the system call interface. Thread safety and signal safety has been improved for file descriptors in general. We now document fixed addresses that are needed for low level allocations.
249 lines
8.6 KiB
C
249 lines
8.6 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/assert.h"
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#include "libc/bits/bits.h"
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#include "libc/bits/likely.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/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/asan.internal.h"
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#include "libc/log/libfatal.internal.h"
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#include "libc/log/log.h"
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#include "libc/macros.internal.h"
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#include "libc/mem/mem.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/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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static void *MoveMemoryIntervals(struct MemoryInterval *d,
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const struct MemoryInterval *s, int n) {
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// asan runtime depends on this function
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int i;
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assert(n >= 0);
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if (d > s) {
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for (i = n; i--;) {
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d[i] = s[i];
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}
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} else {
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for (i = 0; i < n; ++i) {
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d[i] = s[i];
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}
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}
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return d;
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}
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static void RemoveMemoryIntervals(struct MemoryIntervals *mm, int i, int n) {
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// asan runtime depends on this function
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assert(i >= 0);
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assert(i + n <= mm->i);
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MoveMemoryIntervals(mm->p + i, mm->p + i + n, mm->i - (i + n));
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mm->i -= n;
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}
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static bool ExtendMemoryIntervals(struct MemoryIntervals *mm) {
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int prot, flags;
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char *base, *shad;
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size_t gran, size;
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struct DirectMap dm;
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gran = kMemtrackGran;
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base = (char *)kMemtrackStart;
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prot = PROT_READ | PROT_WRITE;
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flags = MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED;
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// TODO(jart): These map handles should not leak across NT fork()
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if (mm->p == mm->s) {
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if (IsAsan()) {
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shad = (char *)(((intptr_t)base >> 3) + 0x7fff8000);
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dm = sys_mmap(shad, gran >> 3, prot, flags, -1, 0);
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if (!dm.addr) return false;
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}
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dm = sys_mmap(base, gran, prot, flags, -1, 0);
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if (!dm.addr) return false;
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MoveMemoryIntervals(dm.addr, mm->p, mm->i);
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mm->p = dm.addr;
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mm->n = gran / sizeof(*mm->p);
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} else {
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size = ROUNDUP(mm->n * sizeof(*mm->p), gran);
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base += size;
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if (IsAsan()) {
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shad = (char *)(((intptr_t)base >> 3) + 0x7fff8000);
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dm = sys_mmap(shad, gran >> 3, prot, flags, -1, 0);
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if (!dm.addr) return false;
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}
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dm = sys_mmap(base, gran, prot, flags, -1, 0);
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if (!dm.addr) return false;
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mm->n = (size + gran) / sizeof(*mm->p);
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}
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#if IsModeDbg()
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assert(AreMemoryIntervalsOk(mm));
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#endif
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return true;
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}
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int CreateMemoryInterval(struct MemoryIntervals *mm, int i) {
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// asan runtime depends on this function
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int rc;
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rc = 0;
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assert(i >= 0);
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assert(i <= mm->i);
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assert(mm->n >= 0);
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if (UNLIKELY(mm->i == mm->n) && !ExtendMemoryIntervals(mm)) return enomem();
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MoveMemoryIntervals(mm->p + i + 1, mm->p + i, mm->i++ - i);
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return 0;
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}
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static int PunchHole(struct MemoryIntervals *mm, int x, int y, int i) {
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if (CreateMemoryInterval(mm, i) == -1) return -1;
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mm->p[i + 0].size -= (size_t)(mm->p[i + 0].y - (x - 1)) * FRAMESIZE;
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mm->p[i + 0].y = x - 1;
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mm->p[i + 1].size -= (size_t)((y + 1) - mm->p[i + 1].x) * FRAMESIZE;
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mm->p[i + 1].x = y + 1;
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return 0;
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}
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int ReleaseMemoryIntervals(struct MemoryIntervals *mm, int x, int y,
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void wf(struct MemoryIntervals *, int, int)) {
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unsigned l, r;
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#if IsModeDbg()
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assert(y >= x);
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assert(AreMemoryIntervalsOk(mm));
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#endif
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if (!mm->i) return 0;
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// binary search for the lefthand side
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l = FindMemoryInterval(mm, x);
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if (l == mm->i) return 0;
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if (y < mm->p[l].x) return 0;
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// binary search for the righthand side
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r = FindMemoryInterval(mm, y);
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if (r == mm->i || (r > l && y < mm->p[r].x)) --r;
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assert(r >= l);
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assert(x <= mm->p[r].y);
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// remove the middle of an existing map
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//
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// ----|mmmmmmmmmmmmmmmm|--------- before
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// xxxxx
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// ----|mmmm|-----|mmmmm|--------- after
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//
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// this isn't possible on windows because we track each
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// 64kb segment on that platform using a separate entry
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if (l == r && x > mm->p[l].x && y < mm->p[l].y) {
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return PunchHole(mm, x, y, l);
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}
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// trim the right side of the lefthand map
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//
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// ----|mmmmmmm|-------------- before
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// xxxxx
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// ----|mmmm|----------------- after
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//
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if (x > mm->p[l].x && x <= mm->p[l].y) {
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assert(y >= mm->p[l].y);
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if (IsWindows()) return einval();
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mm->p[l].size -= (size_t)(mm->p[l].y - (x - 1)) * FRAMESIZE;
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mm->p[l].y = x - 1;
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assert(mm->p[l].x <= mm->p[l].y);
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++l;
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}
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// trim the left side of the righthand map
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//
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// ------------|mmmmm|-------- before
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// xxxxx
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// ---------------|mm|-------- after
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//
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if (y >= mm->p[r].x && y < mm->p[r].y) {
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assert(x <= mm->p[r].x);
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if (IsWindows()) return einval();
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mm->p[r].size -= (size_t)((y + 1) - mm->p[r].x) * FRAMESIZE;
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mm->p[r].x = y + 1;
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assert(mm->p[r].x <= mm->p[r].y);
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--r;
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}
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if (l <= r) {
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if (IsWindows() && wf) {
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wf(mm, l, r);
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}
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RemoveMemoryIntervals(mm, l, r - l + 1);
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}
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return 0;
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}
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int TrackMemoryInterval(struct MemoryIntervals *mm, int x, int y, long h,
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int prot, int flags, bool readonlyfile, bool iscow,
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long offset, long size) {
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// asan runtime depends on this function
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unsigned i;
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#if IsModeDbg()
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assert(y >= x);
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assert(AreMemoryIntervalsOk(mm));
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#endif
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i = FindMemoryInterval(mm, x);
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// try to extend the righthand side of the lefthand entry
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// we can't do that if we're tracking independent handles
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// we can't do that if it's a file map with a small size!
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if (i && x == mm->p[i - 1].y + 1 && h == mm->p[i - 1].h &&
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prot == mm->p[i - 1].prot && flags == mm->p[i - 1].flags &&
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mm->p[i - 1].size ==
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(size_t)(mm->p[i - 1].y - mm->p[i - 1].x) * FRAMESIZE + FRAMESIZE) {
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mm->p[i - 1].size += (size_t)(y - mm->p[i - 1].y) * FRAMESIZE;
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mm->p[i - 1].y = y;
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// if we filled the hole then merge the two mappings
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if (i < mm->i && y + 1 == mm->p[i].x && h == mm->p[i].h &&
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prot == mm->p[i].prot && flags == mm->p[i].flags) {
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mm->p[i - 1].y = mm->p[i].y;
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mm->p[i - 1].size += mm->p[i].size;
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RemoveMemoryIntervals(mm, i, 1);
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}
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}
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// try to extend the lefthand side of the righthand entry
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// we can't do that if we're creating a smaller file map!
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else if (i < mm->i && y + 1 == mm->p[i].x && h == mm->p[i].h &&
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prot == mm->p[i].prot && flags == mm->p[i].flags &&
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size == (size_t)(y - x) * FRAMESIZE + FRAMESIZE) {
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mm->p[i].size += (size_t)(mm->p[i].x - x) * FRAMESIZE;
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mm->p[i].x = x;
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}
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// otherwise, create a new entry and memmove the items
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else {
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if (CreateMemoryInterval(mm, i) == -1) return -1;
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mm->p[i].x = x;
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mm->p[i].y = y;
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mm->p[i].h = h;
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mm->p[i].prot = prot;
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mm->p[i].flags = flags;
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mm->p[i].offset = offset;
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mm->p[i].size = size;
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mm->p[i].iscow = iscow;
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mm->p[i].readonlyfile = readonlyfile;
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}
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return 0;
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}
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