mirror of
https://github.com/chromium/crashpad.git
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c11d49db88
ARM64 supports storing pointer authentication codes in the upper bits of a pointer. This mask can be used by LLDB to mimic ptrauth_strip and strip the pointer authentication codes. To recover an address from pointer with an authentication code, `AND` this mask with the pointer. If the platform does not support pointer authentication, or the range of valid addressees for a pointer was unaccessible, this field will be 0 and should be ignored. Change-Id: Ie5cef90802dd1e892d456195ab8874223eac6a1b Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/2773358 Commit-Queue: Justin Cohen <justincohen@chromium.org> Reviewed-by: Mark Mentovai <mark@chromium.org>
409 lines
12 KiB
C++
409 lines
12 KiB
C++
// Copyright 2014 The Crashpad Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "snapshot/mac/system_snapshot_mac.h"
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#include <Availability.h>
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#include <stddef.h>
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#include <sys/sysctl.h>
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#include <sys/types.h>
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#include <sys/utsname.h>
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#include <algorithm>
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#include "base/logging.h"
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#include "base/notreached.h"
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#include "base/scoped_clear_last_error.h"
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#include "base/strings/stringprintf.h"
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#include "build/build_config.h"
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#include "snapshot/cpu_context.h"
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#include "snapshot/mac/process_reader_mac.h"
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#include "snapshot/posix/timezone.h"
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#include "util/mac/mac_util.h"
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#include "util/mac/sysctl.h"
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#include "util/numeric/in_range_cast.h"
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namespace crashpad {
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namespace {
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template <typename T>
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int ReadIntSysctlByName_NoLog(const char* name, T* value) {
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size_t value_len = sizeof(*value);
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return sysctlbyname(name, value, &value_len, nullptr, 0);
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}
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template <typename T>
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T ReadIntSysctlByName(const char* name, T default_value) {
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T value;
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if (ReadIntSysctlByName_NoLog(name, &value) != 0) {
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PLOG(WARNING) << "sysctlbyname " << name;
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return default_value;
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}
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return value;
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}
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template <typename T>
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T CastIntSysctlByName(const char* name, T default_value) {
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int int_value = ReadIntSysctlByName<int>(name, default_value);
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return InRangeCast<T>(int_value, default_value);
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}
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#if defined(ARCH_CPU_X86_FAMILY)
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void CallCPUID(uint32_t leaf,
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uint32_t* eax,
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uint32_t* ebx,
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uint32_t* ecx,
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uint32_t* edx) {
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asm("cpuid"
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: "=a"(*eax), "=b"(*ebx), "=c"(*ecx), "=d"(*edx)
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: "a"(leaf), "b"(0), "c"(0), "d"(0));
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}
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#endif
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} // namespace
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namespace internal {
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SystemSnapshotMac::SystemSnapshotMac()
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: SystemSnapshot(),
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os_version_full_(),
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os_version_build_(),
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process_reader_(nullptr),
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snapshot_time_(nullptr),
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os_version_major_(0),
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os_version_minor_(0),
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os_version_bugfix_(0),
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os_server_(false),
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initialized_() {
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}
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SystemSnapshotMac::~SystemSnapshotMac() {
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}
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void SystemSnapshotMac::Initialize(ProcessReaderMac* process_reader,
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const timeval* snapshot_time) {
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INITIALIZATION_STATE_SET_INITIALIZING(initialized_);
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process_reader_ = process_reader;
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snapshot_time_ = snapshot_time;
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// MacOSVersionComponents() logs its own warnings if it can’t figure anything
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// out. It’s not fatal if this happens. The default values are reasonable.
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std::string os_version_string;
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MacOSVersionComponents(&os_version_major_,
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&os_version_minor_,
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&os_version_bugfix_,
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&os_version_build_,
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&os_server_,
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&os_version_string);
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std::string uname_string;
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utsname uts;
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if (uname(&uts) != 0) {
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PLOG(WARNING) << "uname";
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} else {
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uname_string = base::StringPrintf(
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"%s %s %s %s", uts.sysname, uts.release, uts.version, uts.machine);
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}
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if (!os_version_string.empty()) {
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if (!uname_string.empty()) {
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os_version_full_ = base::StringPrintf(
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"%s; %s", os_version_string.c_str(), uname_string.c_str());
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} else {
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os_version_full_ = os_version_string;
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}
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} else {
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os_version_full_ = uname_string;
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}
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INITIALIZATION_STATE_SET_VALID(initialized_);
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}
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CPUArchitecture SystemSnapshotMac::GetCPUArchitecture() const {
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INITIALIZATION_STATE_DCHECK_VALID(initialized_);
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#if defined(ARCH_CPU_X86_FAMILY)
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return process_reader_->Is64Bit() ? kCPUArchitectureX86_64
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: kCPUArchitectureX86;
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#elif defined(ARCH_CPU_ARM64)
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return kCPUArchitectureARM64;
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#else
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#error port to your architecture
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#endif
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}
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uint32_t SystemSnapshotMac::CPURevision() const {
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INITIALIZATION_STATE_DCHECK_VALID(initialized_);
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#if defined(ARCH_CPU_X86_FAMILY)
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// machdep.cpu.family and machdep.cpu.model already take the extended family
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// and model IDs into account. See 10.9.2 xnu-2422.90.20/osfmk/i386/cpuid.c
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// cpuid_set_generic_info().
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uint16_t family = CastIntSysctlByName<uint16_t>("machdep.cpu.family", 0);
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uint8_t model = CastIntSysctlByName<uint8_t>("machdep.cpu.model", 0);
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uint8_t stepping = CastIntSysctlByName<uint8_t>("machdep.cpu.stepping", 0);
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return (family << 16) | (model << 8) | stepping;
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#elif defined(ARCH_CPU_ARM64)
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// TODO(macos_arm64): Verify and test.
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return CastIntSysctlByName<uint32_t>("hw.cpufamily", 0);
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#else
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#error port to your architecture
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#endif
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}
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uint8_t SystemSnapshotMac::CPUCount() const {
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INITIALIZATION_STATE_DCHECK_VALID(initialized_);
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return CastIntSysctlByName<uint8_t>("hw.ncpu", 1);
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}
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std::string SystemSnapshotMac::CPUVendor() const {
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INITIALIZATION_STATE_DCHECK_VALID(initialized_);
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#if defined(ARCH_CPU_X86_FAMILY)
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return ReadStringSysctlByName("machdep.cpu.vendor", true);
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#elif defined(ARCH_CPU_ARM64)
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return ReadStringSysctlByName("machdep.cpu.brand_string", true);
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#else
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#error port to your architecture
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#endif
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}
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void SystemSnapshotMac::CPUFrequency(
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uint64_t* current_hz, uint64_t* max_hz) const {
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INITIALIZATION_STATE_DCHECK_VALID(initialized_);
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#if defined(ARCH_CPU_X86_FAMILY)
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*current_hz = ReadIntSysctlByName<uint64_t>("hw.cpufrequency", 0);
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*max_hz = ReadIntSysctlByName<uint64_t>("hw.cpufrequency_max", 0);
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#elif defined(ARCH_CPU_ARM64)
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// TODO(https://crashpad.chromium.org/bug/352): When production arm64
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// hardware is available, determine whether CPU frequency is visible anywhere
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// (likely via a sysctl or via IOKit) and use it if feasible.
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*current_hz = 0;
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*max_hz = 0;
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#else
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#error port to your architecture
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#endif
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}
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uint32_t SystemSnapshotMac::CPUX86Signature() const {
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INITIALIZATION_STATE_DCHECK_VALID(initialized_);
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#if defined(ARCH_CPU_X86_FAMILY)
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return ReadIntSysctlByName<uint32_t>("machdep.cpu.signature", 0);
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#else
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NOTREACHED();
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return 0;
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#endif
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}
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uint64_t SystemSnapshotMac::CPUX86Features() const {
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INITIALIZATION_STATE_DCHECK_VALID(initialized_);
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#if defined(ARCH_CPU_X86_FAMILY)
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return ReadIntSysctlByName<uint64_t>("machdep.cpu.feature_bits", 0);
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#else
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NOTREACHED();
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return 0;
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#endif
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}
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uint64_t SystemSnapshotMac::CPUX86ExtendedFeatures() const {
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INITIALIZATION_STATE_DCHECK_VALID(initialized_);
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#if defined(ARCH_CPU_X86_FAMILY)
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return ReadIntSysctlByName<uint64_t>("machdep.cpu.extfeature_bits", 0);
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#else
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NOTREACHED();
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return 0;
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#endif
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}
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uint32_t SystemSnapshotMac::CPUX86Leaf7Features() const {
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INITIALIZATION_STATE_DCHECK_VALID(initialized_);
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#if defined(ARCH_CPU_X86_FAMILY)
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// The machdep.cpu.leaf7_feature_bits sysctl isn’t supported prior to OS X
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// 10.7, so read this by calling cpuid directly.
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//
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// machdep.cpu.max_basic could be used to check whether to read the leaf, but
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// that sysctl isn’t supported prior to Mac OS X 10.6, so read the maximum
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// basic leaf by calling cpuid directly as well. All CPUs that Apple is known
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// to have shipped should support a maximum basic leaf value of at least 0xa.
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uint32_t eax, ebx, ecx, edx;
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CallCPUID(0, &eax, &ebx, &ecx, &edx);
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if (eax < 7) {
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return 0;
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}
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CallCPUID(7, &eax, &ebx, &ecx, &edx);
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return ebx;
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#else
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NOTREACHED();
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return 0;
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#endif
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}
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bool SystemSnapshotMac::CPUX86SupportsDAZ() const {
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INITIALIZATION_STATE_DCHECK_VALID(initialized_);
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#if defined(ARCH_CPU_X86_FAMILY)
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// The correct way to check for denormals-as-zeros (DAZ) support is to examine
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// mxcsr mask, which can be done with fxsave. See Intel Software Developer’s
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// Manual, Volume 1: Basic Architecture (253665-051), 11.6.3 “Checking for the
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// DAZ Flag in the MXCSR Register”. Note that since this function tests for
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// DAZ support in the CPU, it checks the mxcsr mask. Testing mxcsr would
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// indicate whether DAZ is actually enabled, which is a per-thread context
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// concern.
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//
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// All CPUs that Apple is known to have shipped should support DAZ.
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// Test for fxsave support.
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uint64_t features = CPUX86Features();
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if (!(features & (UINT64_C(1) << 24))) {
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return false;
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}
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// Call fxsave.
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#if defined(ARCH_CPU_X86)
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CPUContextX86::Fxsave fxsave __attribute__((aligned(16))) = {};
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#elif defined(ARCH_CPU_X86_64)
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CPUContextX86_64::Fxsave fxsave __attribute__((aligned(16))) = {};
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#endif
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static_assert(sizeof(fxsave) == 512, "fxsave size");
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static_assert(offsetof(decltype(fxsave), mxcsr_mask) == 28,
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"mxcsr_mask offset");
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asm("fxsave %0" : "=m"(fxsave));
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// Test the DAZ bit.
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return fxsave.mxcsr_mask & (1 << 6);
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#else
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NOTREACHED();
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return false;
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#endif
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}
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SystemSnapshot::OperatingSystem SystemSnapshotMac::GetOperatingSystem() const {
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INITIALIZATION_STATE_DCHECK_VALID(initialized_);
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return kOperatingSystemMacOSX;
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}
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bool SystemSnapshotMac::OSServer() const {
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INITIALIZATION_STATE_DCHECK_VALID(initialized_);
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return os_server_;
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}
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void SystemSnapshotMac::OSVersion(int* major,
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int* minor,
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int* bugfix,
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std::string* build) const {
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INITIALIZATION_STATE_DCHECK_VALID(initialized_);
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*major = os_version_major_;
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*minor = os_version_minor_;
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*bugfix = os_version_bugfix_;
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build->assign(os_version_build_);
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}
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std::string SystemSnapshotMac::OSVersionFull() const {
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INITIALIZATION_STATE_DCHECK_VALID(initialized_);
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return os_version_full_;
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}
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std::string SystemSnapshotMac::MachineDescription() const {
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INITIALIZATION_STATE_DCHECK_VALID(initialized_);
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std::string model;
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std::string board_id;
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MacModelAndBoard(&model, &board_id);
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if (!model.empty()) {
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if (!board_id.empty()) {
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return base::StringPrintf("%s (%s)", model.c_str(), board_id.c_str());
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}
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return model;
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}
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if (!board_id.empty()) {
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return base::StringPrintf("(%s)", board_id.c_str());
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}
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return std::string();
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}
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bool SystemSnapshotMac::NXEnabled() const {
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INITIALIZATION_STATE_DCHECK_VALID(initialized_);
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int value;
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if (ReadIntSysctlByName_NoLog("kern.nx", &value) != 0) {
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{
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// Support for the kern.nx sysctlbyname is compiled out of production
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// kernels on macOS 10.14.5 and later, although it’s available in
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// development and debug kernels. Compare 10.14.3
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// xnu-4903.241.1/bsd/kern/kern_sysctl.c to 10.15.0
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// xnu-6153.11.26/bsd/kern/kern_sysctl.c (10.14.4 and 10.14.5 xnu source
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// are not yet available). In newer production kernels, NX is always
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// enabled. See 10.15.0 xnu-6153.11.26/osfmk/x86_64/pmap.c nx_enabled.
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#if __MAC_OS_X_VERSION_MIN_REQUIRED >= __MAC_10_14
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const bool nx_always_enabled = true;
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#else // DT >= 10.14
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base::ScopedClearLastError reset_errno;
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const bool nx_always_enabled = MacOSVersionNumber() >= 10'14'00;
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#endif // DT >= 10.14
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if (nx_always_enabled) {
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return true;
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}
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}
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// Even if sysctlbyname should have worked, NX is enabled by default in all
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// supported configurations, so return true even while warning.
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PLOG(WARNING) << "sysctlbyname kern.nx";
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return true;
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}
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return value;
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}
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void SystemSnapshotMac::TimeZone(DaylightSavingTimeStatus* dst_status,
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int* standard_offset_seconds,
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int* daylight_offset_seconds,
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std::string* standard_name,
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std::string* daylight_name) const {
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INITIALIZATION_STATE_DCHECK_VALID(initialized_);
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internal::TimeZone(*snapshot_time_,
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dst_status,
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standard_offset_seconds,
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daylight_offset_seconds,
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standard_name,
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daylight_name);
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}
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uint64_t SystemSnapshotMac::AddressMask() const {
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uint64_t mask = 0;
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#if defined(ARCH_CPU_ARM64)
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// `machdep.virtual_address_size` is the number of addressable bits in
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// userspace virtual addresses
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uint8_t addressable_bits =
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CastIntSysctlByName<uint8_t>("machdep.virtual_address_size", 0);
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if (addressable_bits) {
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mask = ~((1UL << addressable_bits) - 1);
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}
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#endif
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return mask;
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}
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} // namespace internal
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} // namespace crashpad
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