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83 lines
2.6 KiB
C++
83 lines
2.6 KiB
C++
// Copyright 2017 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "base/memory/protected_memory.h"
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#include <stdint.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#if defined(OS_LINUX)
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#include <sys/resource.h>
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#endif // defined(OS_LINUX)
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#if defined(OS_MACOSX) && !defined(OS_IOS)
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#include <mach/mach.h>
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#include <mach/mach_vm.h>
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#endif // defined(OS_MACOSX) && !defined(OS_IOS)
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#include "base/posix/eintr_wrapper.h"
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#include "base/synchronization/lock.h"
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#include "build/build_config.h"
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namespace base {
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#if !defined(COMPONENT_BUILD)
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PROTECTED_MEMORY_SECTION int AutoWritableMemory::writers = 0;
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#endif // !defined(COMPONENT_BUILD)
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base::LazyInstance<Lock>::Leaky AutoWritableMemory::writers_lock =
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LAZY_INSTANCE_INITIALIZER;
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static uintptr_t page_mask() {
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return ~(static_cast<uintptr_t>(getpagesize()) - 1);
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}
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static bool SetMemory(void* start, void* end, int prot) {
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const uintptr_t page_start = reinterpret_cast<uintptr_t>(start) & page_mask();
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return mprotect(reinterpret_cast<void*>(page_start),
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reinterpret_cast<uintptr_t>(end) - page_start, prot) == 0;
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}
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bool AutoWritableMemory::SetMemoryReadWrite(void* start, void* end) {
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return SetMemory(start, end, PROT_READ | PROT_WRITE);
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}
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bool AutoWritableMemory::SetMemoryReadOnly(void* start, void* end) {
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return SetMemory(start, end, PROT_READ);
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}
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#if defined(OS_LINUX)
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void AssertMemoryIsReadOnly(const void* ptr) {
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#if DCHECK_IS_ON()
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const uintptr_t page_start = reinterpret_cast<uintptr_t>(ptr) & page_mask();
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// Note: We've casted away const here, which should not be meaningful since
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// if the memory is written to we will abort immediately.
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int result =
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getrlimit(RLIMIT_NPROC, reinterpret_cast<struct rlimit*>(page_start));
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DCHECK_EQ(result, -1);
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DCHECK_EQ(errno, EFAULT);
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#endif // DCHECK_IS_ON()
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}
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#elif defined(OS_MACOSX) && !defined(OS_IOS)
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void AssertMemoryIsReadOnly(const void* ptr) {
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#if DCHECK_IS_ON()
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mach_port_t object_name;
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vm_region_basic_info_64 region_info;
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mach_vm_size_t size = 1;
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mach_msg_type_number_t count = VM_REGION_BASIC_INFO_COUNT_64;
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kern_return_t kr = mach_vm_region(
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mach_task_self(), reinterpret_cast<mach_vm_address_t*>(&ptr), &size,
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VM_REGION_BASIC_INFO_64, reinterpret_cast<vm_region_info_t>(®ion_info),
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&count, &object_name);
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DCHECK_EQ(kr, KERN_SUCCESS);
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DCHECK_EQ(region_info.protection, VM_PROT_READ);
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#endif // DCHECK_IS_ON()
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}
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#endif // defined(OS_LINUX) || (defined(OS_MACOSX) && !defined(OS_IOS))
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} // namespace base
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