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   uptr ptr = *address;
  27   return !IsAppMem(ptr) || !IsAppMem(ptr + size - 1);
  28 }
  29
  30 TSAN_INTERCEPTOR(kern_return_t, mach_vm_allocate, vm_map_t target,
  31                  mach_vm_address_t *address, mach_vm_size_t size, int flags) {
  32   SCOPED_TSAN_INTERCEPTOR(mach_vm_allocate, target, address, size, flags);
  33   if (target != mach_task_self())
  34     return REAL(mach_vm_allocate)(target, address, size, flags);
  35   if (intersects_with_shadow(address, size, flags))
  36     return KERN_NO_SPACE;
  37   kern_return_t res = REAL(mach_vm_allocate)(target, address, size, flags);
  38   if (res == KERN_SUCCESS)
  39     MemoryRangeImitateWriteOrResetRange(thr, pc, *address, size);
  40   return res;
  41 }
  42
  43 TSAN_INTERCEPTOR(kern_return_t, mach_vm_deallocate, vm_map_t target,
  44                  mach_vm_address_t address, mach_vm_size_t size) {
  45   SCOPED_TSAN_INTERCEPTOR(mach_vm_deallocate, target, address, size);
  46   if (target != mach_task_self())
  47     return REAL(mach_vm_deallocate)(target, address, size);
  48   UnmapShadow(thr, address, size);
  49   return REAL(mach_vm_deallocate)(target, address, size);
  50 }
  51
  52 }  // namespace __tsan