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