mirror of
https://github.com/chromium/crashpad.git
synced 2024-12-30 01:06:56 +08:00
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.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
#include "snapshot/linux/debug_rendezvous.h"
|
|
|
|
#include <stdint.h>
|
|
|
|
#include <set>
|
|
|
|
#include "base/logging.h"
|
|
|
|
namespace crashpad {
|
|
|
|
namespace {
|
|
|
|
struct Traits32 {
|
|
using Integer = int32_t;
|
|
using Address = uint32_t;
|
|
};
|
|
|
|
struct Traits64 {
|
|
using Integer = int64_t;
|
|
using Address = uint64_t;
|
|
};
|
|
|
|
template <typename Traits>
|
|
struct DebugRendezvousSpecific {
|
|
typename Traits::Integer r_version;
|
|
typename Traits::Address r_map;
|
|
typename Traits::Address r_brk;
|
|
typename Traits::Integer r_state;
|
|
typename Traits::Address r_ldbase;
|
|
};
|
|
|
|
template <typename Traits>
|
|
struct LinkEntrySpecific {
|
|
typename Traits::Address l_addr;
|
|
typename Traits::Address l_name;
|
|
typename Traits::Address l_ld;
|
|
typename Traits::Address l_next;
|
|
typename Traits::Address l_prev;
|
|
};
|
|
|
|
template <typename Traits>
|
|
bool ReadLinkEntry(const ProcessMemoryRange& memory,
|
|
LinuxVMAddress* address,
|
|
DebugRendezvous::LinkEntry* entry_out) {
|
|
LinkEntrySpecific<Traits> entry;
|
|
if (!memory.Read(*address, sizeof(entry), &entry)) {
|
|
return false;
|
|
}
|
|
|
|
std::string name;
|
|
if (!memory.ReadCStringSizeLimited(entry.l_name, 4096, &name)) {
|
|
return false;
|
|
}
|
|
|
|
entry_out->load_bias = entry.l_addr;
|
|
entry_out->dynamic_array = entry.l_ld;
|
|
entry_out->name.swap(name);
|
|
|
|
*address = entry.l_next;
|
|
return true;
|
|
}
|
|
|
|
} // namespace
|
|
|
|
DebugRendezvous::LinkEntry::LinkEntry()
|
|
: name(), load_bias(0), dynamic_array(0) {}
|
|
|
|
DebugRendezvous::DebugRendezvous()
|
|
: modules_(), executable_(), initialized_() {}
|
|
|
|
DebugRendezvous::~DebugRendezvous() {}
|
|
|
|
bool DebugRendezvous::Initialize(const ProcessMemoryRange& memory,
|
|
LinuxVMAddress address) {
|
|
INITIALIZATION_STATE_SET_INITIALIZING(initialized_);
|
|
if (!(memory.Is64Bit() ? InitializeSpecific<Traits64>(memory, address)
|
|
: InitializeSpecific<Traits32>(memory, address))) {
|
|
return false;
|
|
}
|
|
INITIALIZATION_STATE_SET_VALID(initialized_);
|
|
return true;
|
|
}
|
|
|
|
const DebugRendezvous::LinkEntry* DebugRendezvous::Executable() const {
|
|
INITIALIZATION_STATE_DCHECK_VALID(initialized_);
|
|
return &executable_;
|
|
}
|
|
|
|
const std::vector<DebugRendezvous::LinkEntry>& DebugRendezvous::Modules()
|
|
const {
|
|
INITIALIZATION_STATE_DCHECK_VALID(initialized_);
|
|
return modules_;
|
|
}
|
|
|
|
template <typename Traits>
|
|
bool DebugRendezvous::InitializeSpecific(const ProcessMemoryRange& memory,
|
|
LinuxVMAddress address) {
|
|
DebugRendezvousSpecific<Traits> debug;
|
|
if (!memory.Read(address, sizeof(debug), &debug)) {
|
|
return false;
|
|
}
|
|
if (debug.r_version != 1) {
|
|
LOG(ERROR) << "unexpected version " << debug.r_version;
|
|
return false;
|
|
}
|
|
|
|
LinuxVMAddress link_entry_address = debug.r_map;
|
|
if (!ReadLinkEntry<Traits>(memory, &link_entry_address, &executable_)) {
|
|
return false;
|
|
}
|
|
|
|
std::set<LinuxVMAddress> visited;
|
|
while (link_entry_address) {
|
|
if (!visited.insert(link_entry_address).second) {
|
|
LOG(ERROR) << "cycle at address 0x" << std::hex << link_entry_address;
|
|
return false;
|
|
}
|
|
|
|
LinkEntry entry;
|
|
if (!ReadLinkEntry<Traits>(memory, &link_entry_address, &entry)) {
|
|
return false;
|
|
}
|
|
modules_.push_back(entry);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
} // namespace crashpad
|