492 lines
14 KiB
C++
492 lines
14 KiB
C++
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// Copyright 2017 The Crashpad Authors. All rights reserved.
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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/linux/exception_snapshot_linux.h"
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#include <signal.h>
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#include "base/logging.h"
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#include "snapshot/linux/capture_memory_delegate_linux.h"
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#include "snapshot/linux/cpu_context_linux.h"
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#include "snapshot/linux/process_reader_linux.h"
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#include "snapshot/linux/signal_context.h"
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#include "util/linux/traits.h"
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#include "util/misc/reinterpret_bytes.h"
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#include "util/numeric/safe_assignment.h"
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namespace crashpad {
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namespace internal {
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ExceptionSnapshotLinux::ExceptionSnapshotLinux()
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: ExceptionSnapshot(),
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context_union_(),
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context_(),
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codes_(),
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thread_id_(0),
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exception_address_(0),
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signal_number_(0),
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signal_code_(0),
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initialized_() {}
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ExceptionSnapshotLinux::~ExceptionSnapshotLinux() {}
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#if defined(ARCH_CPU_X86_FAMILY)
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template <>
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bool ExceptionSnapshotLinux::ReadContext<ContextTraits32>(
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ProcessReaderLinux* reader,
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LinuxVMAddress context_address) {
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UContext<ContextTraits32> ucontext;
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if (!reader->Memory()->Read(context_address, sizeof(ucontext), &ucontext)) {
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LOG(ERROR) << "Couldn't read ucontext";
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return false;
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}
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context_.architecture = kCPUArchitectureX86;
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context_.x86 = &context_union_.x86;
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if (!ucontext.mcontext.fpptr) {
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InitializeCPUContextX86_NoFloatingPoint(ucontext.mcontext.gprs,
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context_.x86);
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return true;
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}
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SignalFloatContext32 fprs;
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if (!reader->Memory()->Read(ucontext.mcontext.fpptr, sizeof(fprs), &fprs)) {
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LOG(ERROR) << "Couldn't read float context";
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return false;
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}
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if (fprs.magic == X86_FXSR_MAGIC) {
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InitializeCPUContextX86_NoFloatingPoint(ucontext.mcontext.gprs,
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context_.x86);
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if (!reader->Memory()->Read(
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ucontext.mcontext.fpptr + offsetof(SignalFloatContext32, fxsave),
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sizeof(CPUContextX86::Fxsave),
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&context_.x86->fxsave)) {
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LOG(ERROR) << "Couldn't read fxsave";
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return false;
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}
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} else if (fprs.magic == 0xffff) {
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InitializeCPUContextX86(ucontext.mcontext.gprs, fprs, context_.x86);
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} else {
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LOG(ERROR) << "unexpected magic 0x" << std::hex << fprs.magic;
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return false;
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}
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return true;
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}
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template <>
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bool ExceptionSnapshotLinux::ReadContext<ContextTraits64>(
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ProcessReaderLinux* reader,
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LinuxVMAddress context_address) {
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UContext<ContextTraits64> ucontext;
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if (!reader->Memory()->Read(context_address, sizeof(ucontext), &ucontext)) {
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LOG(ERROR) << "Couldn't read ucontext";
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return false;
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}
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context_.architecture = kCPUArchitectureX86_64;
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context_.x86_64 = &context_union_.x86_64;
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if (!ucontext.mcontext.fpptr) {
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InitializeCPUContextX86_64_NoFloatingPoint(ucontext.mcontext.gprs,
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context_.x86_64);
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return true;
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}
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SignalFloatContext64 fprs;
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if (!reader->Memory()->Read(ucontext.mcontext.fpptr, sizeof(fprs), &fprs)) {
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LOG(ERROR) << "Couldn't read float context";
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return false;
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}
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InitializeCPUContextX86_64(ucontext.mcontext.gprs, fprs, context_.x86_64);
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return true;
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}
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#elif defined(ARCH_CPU_ARM_FAMILY)
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template <>
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bool ExceptionSnapshotLinux::ReadContext<ContextTraits32>(
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ProcessReaderLinux* reader,
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LinuxVMAddress context_address) {
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context_.architecture = kCPUArchitectureARM;
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context_.arm = &context_union_.arm;
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CPUContextARM* dest_context = context_.arm;
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const ProcessMemory* memory = reader->Memory();
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LinuxVMAddress gprs_address =
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context_address + offsetof(UContext<ContextTraits32>, mcontext32) +
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offsetof(ContextTraits32::MContext32, gprs);
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SignalThreadContext32 thread_context;
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if (!memory->Read(gprs_address, sizeof(thread_context), &thread_context)) {
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LOG(ERROR) << "Couldn't read gprs";
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return false;
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}
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InitializeCPUContextARM_NoFloatingPoint(thread_context, dest_context);
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LinuxVMAddress reserved_address =
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context_address + offsetof(UContext<ContextTraits32>, reserved);
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if ((reserved_address & 7) != 0) {
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LOG(ERROR) << "invalid alignment 0x" << std::hex << reserved_address;
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return false;
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}
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constexpr VMSize kMaxContextSpace = 1024;
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ProcessMemoryRange range;
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if (!range.Initialize(memory, false, reserved_address, kMaxContextSpace)) {
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return false;
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}
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do {
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CoprocessorContextHead head;
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if (!range.Read(reserved_address, sizeof(head), &head)) {
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LOG(ERROR) << "missing context terminator";
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return false;
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}
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reserved_address += sizeof(head);
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switch (head.magic) {
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case VFP_MAGIC:
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if (head.size != sizeof(SignalVFPContext) + sizeof(head)) {
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LOG(ERROR) << "unexpected vfp context size " << head.size;
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return false;
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}
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static_assert(
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sizeof(SignalVFPContext::vfp) == sizeof(dest_context->vfp_regs),
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"vfp context size mismatch");
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if (!range.Read(reserved_address + offsetof(SignalVFPContext, vfp),
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sizeof(dest_context->vfp_regs),
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&dest_context->vfp_regs)) {
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LOG(ERROR) << "Couldn't read vfp";
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return false;
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}
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dest_context->have_vfp_regs = true;
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return true;
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case CRUNCH_MAGIC:
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case IWMMXT_MAGIC:
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case DUMMY_MAGIC:
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reserved_address += head.size - sizeof(head);
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continue;
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case 0:
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return true;
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default:
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LOG(ERROR) << "invalid magic number 0x" << std::hex << head.magic;
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return false;
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}
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} while (true);
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}
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template <>
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bool ExceptionSnapshotLinux::ReadContext<ContextTraits64>(
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ProcessReaderLinux* reader,
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LinuxVMAddress context_address) {
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context_.architecture = kCPUArchitectureARM64;
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context_.arm64 = &context_union_.arm64;
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CPUContextARM64* dest_context = context_.arm64;
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const ProcessMemory* memory = reader->Memory();
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LinuxVMAddress gprs_address =
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context_address + offsetof(UContext<ContextTraits64>, mcontext64) +
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offsetof(ContextTraits64::MContext64, gprs);
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ThreadContext::t64_t thread_context;
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if (!memory->Read(gprs_address, sizeof(thread_context), &thread_context)) {
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LOG(ERROR) << "Couldn't read gprs";
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return false;
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}
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InitializeCPUContextARM64_NoFloatingPoint(thread_context, dest_context);
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LinuxVMAddress reserved_address =
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context_address + offsetof(UContext<ContextTraits64>, reserved);
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if ((reserved_address & 15) != 0) {
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LOG(ERROR) << "invalid alignment 0x" << std::hex << reserved_address;
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return false;
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}
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constexpr VMSize kMaxContextSpace = 4096;
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ProcessMemoryRange range;
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if (!range.Initialize(memory, true, reserved_address, kMaxContextSpace)) {
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return false;
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}
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do {
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CoprocessorContextHead head;
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if (!range.Read(reserved_address, sizeof(head), &head)) {
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LOG(ERROR) << "missing context terminator";
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return false;
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}
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reserved_address += sizeof(head);
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switch (head.magic) {
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case FPSIMD_MAGIC:
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if (head.size != sizeof(SignalFPSIMDContext) + sizeof(head)) {
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LOG(ERROR) << "unexpected fpsimd context size " << head.size;
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return false;
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}
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SignalFPSIMDContext fpsimd;
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if (!range.Read(reserved_address, sizeof(fpsimd), &fpsimd)) {
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LOG(ERROR) << "Couldn't read fpsimd " << head.size;
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return false;
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}
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InitializeCPUContextARM64_OnlyFPSIMD(fpsimd, dest_context);
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return true;
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case ESR_MAGIC:
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case EXTRA_MAGIC:
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reserved_address += head.size - sizeof(head);
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continue;
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case 0:
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LOG(WARNING) << "fpsimd not found";
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return true;
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default:
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LOG(ERROR) << "invalid magic number 0x" << std::hex << head.magic;
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return false;
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}
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} while (true);
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}
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#elif defined(ARCH_CPU_MIPS_FAMILY)
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template <typename Traits>
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static bool ReadContext(ProcessReaderLinux* reader,
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LinuxVMAddress context_address,
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typename Traits::CPUContext* dest_context) {
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const ProcessMemory* memory = reader->Memory();
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LinuxVMAddress gregs_address = context_address +
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offsetof(UContext<Traits>, mcontext) +
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offsetof(typename Traits::MContext, gregs);
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typename Traits::SignalThreadContext thread_context;
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if (!memory->Read(gregs_address, sizeof(thread_context), &thread_context)) {
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LOG(ERROR) << "Couldn't read gregs";
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return false;
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}
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LinuxVMAddress fpregs_address = context_address +
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offsetof(UContext<Traits>, mcontext) +
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offsetof(typename Traits::MContext, fpregs);
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typename Traits::SignalFloatContext fp_context;
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if (!memory->Read(fpregs_address, sizeof(fp_context), &fp_context)) {
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LOG(ERROR) << "Couldn't read fpregs";
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return false;
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}
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InitializeCPUContextMIPS<Traits>(thread_context, fp_context, dest_context);
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return true;
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}
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template <>
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bool ExceptionSnapshotLinux::ReadContext<ContextTraits32>(
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ProcessReaderLinux* reader,
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LinuxVMAddress context_address) {
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context_.architecture = kCPUArchitectureMIPSEL;
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context_.mipsel = &context_union_.mipsel;
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return internal::ReadContext<ContextTraits32>(
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reader, context_address, context_.mipsel);
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}
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template <>
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bool ExceptionSnapshotLinux::ReadContext<ContextTraits64>(
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ProcessReaderLinux* reader,
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LinuxVMAddress context_address) {
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context_.architecture = kCPUArchitectureMIPS64EL;
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context_.mips64 = &context_union_.mips64;
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return internal::ReadContext<ContextTraits64>(
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reader, context_address, context_.mips64);
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}
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#endif // ARCH_CPU_X86_FAMILY
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bool ExceptionSnapshotLinux::Initialize(ProcessReaderLinux* process_reader,
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LinuxVMAddress siginfo_address,
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LinuxVMAddress context_address,
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pid_t thread_id) {
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INITIALIZATION_STATE_SET_INITIALIZING(initialized_);
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thread_id_ = thread_id;
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const ProcessReaderLinux::Thread* thread = nullptr;
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for (const auto& loop_thread : process_reader->Threads()) {
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if (thread_id == loop_thread.tid) {
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thread = &loop_thread;
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break;
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}
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}
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if (!thread) {
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// This is allowed until {ProcessReaderLinux::InitializeThreads()} is
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// improved to support target threads in the same thread group.
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LOG(WARNING) << "thread ID " << thread_id << " not found in process";
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}
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if (process_reader->Is64Bit()) {
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if (!ReadContext<ContextTraits64>(process_reader, context_address) ||
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!ReadSiginfo<Traits64>(process_reader, siginfo_address)) {
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return false;
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}
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} else {
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if (!ReadContext<ContextTraits32>(process_reader, context_address) ||
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!ReadSiginfo<Traits32>(process_reader, siginfo_address)) {
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return false;
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}
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}
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CaptureMemoryDelegateLinux capture_memory_delegate(
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process_reader, thread, &extra_memory_, nullptr);
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CaptureMemory::PointedToByContext(context_, &capture_memory_delegate);
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INITIALIZATION_STATE_SET_VALID(initialized_);
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return true;
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}
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template <typename Traits>
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bool ExceptionSnapshotLinux::ReadSiginfo(ProcessReaderLinux* reader,
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LinuxVMAddress siginfo_address) {
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Siginfo<Traits> siginfo;
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if (!reader->Memory()->Read(siginfo_address, sizeof(siginfo), &siginfo)) {
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LOG(ERROR) << "Couldn't read siginfo";
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return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
signal_number_ = siginfo.signo;
|
||
|
|
signal_code_ = siginfo.code;
|
||
|
|
|
||
|
|
uint64_t extra_code;
|
||
|
|
#define PUSH_CODE(value) \
|
||
|
|
do { \
|
||
|
|
if (!ReinterpretBytes(value, &extra_code)) { \
|
||
|
|
LOG(ERROR) << "bad code"; \
|
||
|
|
return false; \
|
||
|
|
} \
|
||
|
|
codes_.push_back(extra_code); \
|
||
|
|
} while (false)
|
||
|
|
|
||
|
|
switch (siginfo.signo) {
|
||
|
|
case SIGILL:
|
||
|
|
case SIGFPE:
|
||
|
|
case SIGSEGV:
|
||
|
|
case SIGBUS:
|
||
|
|
case SIGTRAP:
|
||
|
|
exception_address_ = siginfo.address;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case SIGPOLL: // SIGIO
|
||
|
|
PUSH_CODE(siginfo.band);
|
||
|
|
PUSH_CODE(siginfo.fd);
|
||
|
|
break;
|
||
|
|
|
||
|
|
case SIGSYS:
|
||
|
|
exception_address_ = siginfo.call_address;
|
||
|
|
PUSH_CODE(siginfo.syscall);
|
||
|
|
PUSH_CODE(siginfo.arch);
|
||
|
|
break;
|
||
|
|
|
||
|
|
case SIGALRM:
|
||
|
|
case SIGVTALRM:
|
||
|
|
case SIGPROF:
|
||
|
|
PUSH_CODE(siginfo.timerid);
|
||
|
|
PUSH_CODE(siginfo.overrun);
|
||
|
|
PUSH_CODE(siginfo.sigval.sigval);
|
||
|
|
break;
|
||
|
|
|
||
|
|
case SIGABRT:
|
||
|
|
case SIGQUIT:
|
||
|
|
case SIGXCPU:
|
||
|
|
case SIGXFSZ:
|
||
|
|
case SIGHUP:
|
||
|
|
case SIGINT:
|
||
|
|
case SIGPIPE:
|
||
|
|
case SIGTERM:
|
||
|
|
case SIGUSR1:
|
||
|
|
case SIGUSR2:
|
||
|
|
#if defined(SIGEMT)
|
||
|
|
case SIGEMT:
|
||
|
|
#endif // SIGEMT
|
||
|
|
#if defined(SIGPWR)
|
||
|
|
case SIGPWR:
|
||
|
|
#endif // SIGPWR
|
||
|
|
#if defined(SIGSTKFLT)
|
||
|
|
case SIGSTKFLT:
|
||
|
|
#endif // SIGSTKFLT
|
||
|
|
PUSH_CODE(siginfo.pid);
|
||
|
|
PUSH_CODE(siginfo.uid);
|
||
|
|
PUSH_CODE(siginfo.sigval.sigval);
|
||
|
|
break;
|
||
|
|
|
||
|
|
default:
|
||
|
|
LOG(WARNING) << "Unhandled signal " << siginfo.signo;
|
||
|
|
}
|
||
|
|
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
const CPUContext* ExceptionSnapshotLinux::Context() const {
|
||
|
|
INITIALIZATION_STATE_DCHECK_VALID(initialized_);
|
||
|
|
return &context_;
|
||
|
|
}
|
||
|
|
|
||
|
|
uint64_t ExceptionSnapshotLinux::ThreadID() const {
|
||
|
|
INITIALIZATION_STATE_DCHECK_VALID(initialized_);
|
||
|
|
return thread_id_;
|
||
|
|
}
|
||
|
|
|
||
|
|
uint32_t ExceptionSnapshotLinux::Exception() const {
|
||
|
|
INITIALIZATION_STATE_DCHECK_VALID(initialized_);
|
||
|
|
return signal_number_;
|
||
|
|
}
|
||
|
|
|
||
|
|
uint32_t ExceptionSnapshotLinux::ExceptionInfo() const {
|
||
|
|
INITIALIZATION_STATE_DCHECK_VALID(initialized_);
|
||
|
|
return signal_code_;
|
||
|
|
}
|
||
|
|
|
||
|
|
uint64_t ExceptionSnapshotLinux::ExceptionAddress() const {
|
||
|
|
INITIALIZATION_STATE_DCHECK_VALID(initialized_);
|
||
|
|
return exception_address_;
|
||
|
|
}
|
||
|
|
|
||
|
|
const std::vector<uint64_t>& ExceptionSnapshotLinux::Codes() const {
|
||
|
|
INITIALIZATION_STATE_DCHECK_VALID(initialized_);
|
||
|
|
return codes_;
|
||
|
|
}
|
||
|
|
|
||
|
|
std::vector<const MemorySnapshot*> ExceptionSnapshotLinux::ExtraMemory() const {
|
||
|
|
INITIALIZATION_STATE_DCHECK_VALID(initialized_);
|
||
|
|
std::vector<const MemorySnapshot*> result;
|
||
|
|
result.reserve(extra_memory_.size());
|
||
|
|
for (const auto& em : extra_memory_) {
|
||
|
|
result.push_back(em.get());
|
||
|
|
}
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
} // namespace internal
|
||
|
|
} // namespace crashpad
|