libsanitizer/tsan/tsan_interceptors_mach_vm.cpp

   1 //===-- tsan_interceptors_mach_vm.cpp -------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file is a part of ThreadSanitizer (TSan), a race detector.
  10 //
  11 // Interceptors for mach_vm_* user space memory routines on Darwin.
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "interception/interception.h"
  15 #include "tsan_interceptors.h"
  16 #include "tsan_platform.h"
  17
  18 #include <mach/mach.h>
  19
  20 namespace __tsan {
  21
  22 static bool intersects_with_shadow(mach_vm_address_t address,
  23                                    mach_vm_size_t size, int flags) {
  24   // VM_FLAGS_FIXED is 0x0, so we have to test for VM_FLAGS_ANYWHERE.
  25   if (flags & VM_FLAGS_ANYWHERE) return false;
  26   return !IsAppMem(address) || !IsAppMem(address + size - 1);
  27 }
  28
  29 TSAN_INTERCEPTOR(kern_return_t, mach_vm_allocate, vm_map_t target,
  30                  mach_vm_address_t *address, mach_vm_size_t size, int flags) {
  31   SCOPED_TSAN_INTERCEPTOR(mach_vm_allocate, target, address, size, flags);
  32   if (target != mach_task_self())
  33     return REAL(mach_vm_allocate)(target, address, size, flags);
  34   if (address && intersects_with_shadow(*address, size, flags))
  35     return KERN_NO_SPACE;
  36   kern_return_t kr = REAL(mach_vm_allocate)(target, address, size, flags);
  37   if (kr == KERN_SUCCESS)
  38     MemoryRangeImitateWriteOrResetRange(thr, pc, *address, size);
  39   return kr;
  40 }
  41
  42 TSAN_INTERCEPTOR(kern_return_t, mach_vm_deallocate, vm_map_t target,
  43                  mach_vm_address_t address, mach_vm_size_t size) {
  44   SCOPED_TSAN_INTERCEPTOR(mach_vm_deallocate, target, address, size);
  45   if (target != mach_task_self())
  46     return REAL(mach_vm_deallocate)(target, address, size);
  47   kern_return_t kr = REAL(mach_vm_deallocate)(target, address, size);
  48   if (kr == KERN_SUCCESS && address)
  49     UnmapShadow(thr, address, size);
  50   return kr;
  51 }
  52
  53 }  // namespace __tsan