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- //===-- tsan_interceptors_mach_vm.cpp -------------------------------------===//
- //
- // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
- // See https://llvm.org/LICENSE.txt for license information.
- // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
- //
- //===----------------------------------------------------------------------===//
- //
- // This file is a part of ThreadSanitizer (TSan), a race detector.
- //
- // Interceptors for mach_vm_* user space memory routines on Darwin.
- //===----------------------------------------------------------------------===//
- #include "interception/interception.h"
- #include "tsan_interceptors.h"
- #include "tsan_platform.h"
- #include <mach/mach.h>
- namespace __tsan {
- static bool intersects_with_shadow(mach_vm_address_t address,
- mach_vm_size_t size, int flags) {
- // VM_FLAGS_FIXED is 0x0, so we have to test for VM_FLAGS_ANYWHERE.
- if (flags & VM_FLAGS_ANYWHERE) return false;
- return !IsAppMem(address) || !IsAppMem(address + size - 1);
- }
- TSAN_INTERCEPTOR(kern_return_t, mach_vm_allocate, vm_map_t target,
- mach_vm_address_t *address, mach_vm_size_t size, int flags) {
- SCOPED_TSAN_INTERCEPTOR(mach_vm_allocate, target, address, size, flags);
- if (target != mach_task_self())
- return REAL(mach_vm_allocate)(target, address, size, flags);
- if (address && intersects_with_shadow(*address, size, flags))
- return KERN_NO_SPACE;
- kern_return_t kr = REAL(mach_vm_allocate)(target, address, size, flags);
- if (kr == KERN_SUCCESS)
- MemoryRangeImitateWriteOrResetRange(thr, pc, *address, size);
- return kr;
- }
- TSAN_INTERCEPTOR(kern_return_t, mach_vm_deallocate, vm_map_t target,
- mach_vm_address_t address, mach_vm_size_t size) {
- SCOPED_TSAN_INTERCEPTOR(mach_vm_deallocate, target, address, size);
- if (target != mach_task_self())
- return REAL(mach_vm_deallocate)(target, address, size);
- kern_return_t kr = REAL(mach_vm_deallocate)(target, address, size);
- if (kr == KERN_SUCCESS && address)
- UnmapShadow(thr, address, size);
- return kr;
- }
- } // namespace __tsan
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