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 53