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041a50d75c
Dynamic linkers use `struct r_debug` and `struct link_map` (defined in `<link.h>`) to communicate lists of loaded modules to debuggers. Bug: crashpad:30 Change-Id: Id903a1c199288dd85c34e38710cdb4c6b5fedb5b Reviewed-on: https://chromium-review.googlesource.com/534853 Reviewed-by: Mark Mentovai <mark@chromium.org>
144 lines
3.8 KiB
C++
144 lines
3.8 KiB
C++
// 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/debug_rendezvous.h"
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#include <stdint.h>
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#include <set>
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#include "base/logging.h"
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namespace crashpad {
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namespace {
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struct Traits32 {
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using Integer = int32_t;
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using Address = uint32_t;
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};
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struct Traits64 {
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using Integer = int64_t;
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using Address = uint64_t;
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};
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template <typename Traits>
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struct DebugRendezvousSpecific {
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typename Traits::Integer r_version;
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typename Traits::Address r_map;
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typename Traits::Address r_brk;
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typename Traits::Integer r_state;
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typename Traits::Address r_ldbase;
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};
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template <typename Traits>
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struct LinkEntrySpecific {
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typename Traits::Address l_addr;
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typename Traits::Address l_name;
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typename Traits::Address l_ld;
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typename Traits::Address l_next;
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typename Traits::Address l_prev;
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};
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template <typename Traits>
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bool ReadLinkEntry(const ProcessMemoryRange& memory,
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LinuxVMAddress* address,
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DebugRendezvous::LinkEntry* entry_out) {
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LinkEntrySpecific<Traits> entry;
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if (!memory.Read(*address, sizeof(entry), &entry)) {
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return false;
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}
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std::string name;
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if (!memory.ReadCStringSizeLimited(entry.l_name, 4096, &name)) {
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return false;
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}
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entry_out->load_bias = entry.l_addr;
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entry_out->dynamic_array = entry.l_ld;
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entry_out->name.swap(name);
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*address = entry.l_next;
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return true;
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}
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} // namespace
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DebugRendezvous::LinkEntry::LinkEntry()
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: name(), load_bias(0), dynamic_array(0) {}
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DebugRendezvous::DebugRendezvous()
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: modules_(), executable_(), initialized_() {}
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DebugRendezvous::~DebugRendezvous() {}
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bool DebugRendezvous::Initialize(const ProcessMemoryRange& memory,
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LinuxVMAddress address) {
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INITIALIZATION_STATE_SET_INITIALIZING(initialized_);
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if (!(memory.Is64Bit() ? InitializeSpecific<Traits64>(memory, address)
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: InitializeSpecific<Traits32>(memory, address))) {
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return false;
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}
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INITIALIZATION_STATE_SET_VALID(initialized_);
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return true;
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}
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const DebugRendezvous::LinkEntry* DebugRendezvous::Executable() const {
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INITIALIZATION_STATE_DCHECK_VALID(initialized_);
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return &executable_;
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}
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const std::vector<DebugRendezvous::LinkEntry>& DebugRendezvous::Modules()
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const {
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INITIALIZATION_STATE_DCHECK_VALID(initialized_);
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return modules_;
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}
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template <typename Traits>
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bool DebugRendezvous::InitializeSpecific(const ProcessMemoryRange& memory,
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LinuxVMAddress address) {
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DebugRendezvousSpecific<Traits> debug;
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if (!memory.Read(address, sizeof(debug), &debug)) {
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return false;
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}
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if (debug.r_version != 1) {
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LOG(ERROR) << "unexpected version " << debug.r_version;
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return false;
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}
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LinuxVMAddress link_entry_address = debug.r_map;
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if (!ReadLinkEntry<Traits>(memory, &link_entry_address, &executable_)) {
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return false;
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}
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std::set<LinuxVMAddress> visited;
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while (link_entry_address) {
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if (!visited.insert(link_entry_address).second) {
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LOG(ERROR) << "cycle at address 0x" << std::hex << link_entry_address;
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return false;
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}
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LinkEntry entry;
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if (!ReadLinkEntry<Traits>(memory, &link_entry_address, &entry)) {
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return false;
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}
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modules_.push_back(entry);
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}
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return true;
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}
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} // namespace crashpad
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