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fa8ef92dc7
Provides Read, ReadCString, and ReadCStringSizeLimited. Does not provide ReadMapped because Linux does not support mmap on /proc/pid/mem. Bug: crashpad:30 Change-Id: Ia319c0107b1f138aeb8e5d0ee480c77310df7202 Reviewed-on: https://chromium-review.googlesource.com/459700 Reviewed-by: Mark Mentovai <mark@chromium.org> Commit-Queue: Joshua Peraza <jperaza@chromium.org>
124 lines
3.4 KiB
C++
124 lines
3.4 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 "util/linux/process_memory.h"
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#include <fcntl.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <algorithm>
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#include "base/logging.h"
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#include "base/posix/eintr_wrapper.h"
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namespace crashpad {
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ProcessMemory::ProcessMemory() : mem_fd_(), pid_(-1) {}
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ProcessMemory::~ProcessMemory() {}
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bool ProcessMemory::Initialize(pid_t pid) {
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pid_ = pid;
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char path[32];
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snprintf(path, sizeof(path), "/proc/%d/mem", pid_);
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mem_fd_.reset(HANDLE_EINTR(open(path, O_RDONLY | O_NOCTTY | O_CLOEXEC)));
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if (!mem_fd_.is_valid()) {
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PLOG(ERROR) << "open";
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return false;
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}
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return true;
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}
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bool ProcessMemory::Read(LinuxVMAddress address,
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size_t size,
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void* buffer) const {
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DCHECK(mem_fd_.is_valid());
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char* buffer_c = static_cast<char*>(buffer);
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while (size > 0) {
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ssize_t bytes_read =
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HANDLE_EINTR(pread(mem_fd_.get(), buffer_c, size, address));
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if (bytes_read < 0) {
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PLOG(ERROR) << "pread";
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return false;
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}
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if (bytes_read == 0) {
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LOG(ERROR) << "unexpected eof";
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return false;
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}
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DCHECK_LE(static_cast<size_t>(bytes_read), size);
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size -= bytes_read;
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address += bytes_read;
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buffer_c += bytes_read;
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}
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return true;
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}
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bool ProcessMemory::ReadCString(LinuxVMAddress address,
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std::string* string) const {
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return ReadCStringInternal(address, false, 0, string);
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}
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bool ProcessMemory::ReadCStringSizeLimited(LinuxVMAddress address,
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size_t size,
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std::string* string) const {
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return ReadCStringInternal(address, true, size, string);
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}
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bool ProcessMemory::ReadCStringInternal(LinuxVMAddress address,
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bool has_size,
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size_t size,
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std::string* string) const {
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DCHECK(mem_fd_.is_valid());
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string->clear();
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char buffer[4096];
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do {
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size_t read_size;
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if (has_size) {
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read_size = std::min(sizeof(buffer), size);
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} else {
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read_size = sizeof(buffer);
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}
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ssize_t bytes_read;
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bytes_read = HANDLE_EINTR(pread(mem_fd_.get(), buffer, read_size, address));
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if (bytes_read < 0) {
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PLOG(ERROR) << "pread";
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return false;
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}
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if (bytes_read == 0) {
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break;
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}
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DCHECK_LE(static_cast<size_t>(bytes_read), read_size);
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char* nul = static_cast<char*>(memchr(buffer, '\0', bytes_read));
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if (nul != nullptr) {
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string->append(buffer, nul - buffer);
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return true;
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}
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string->append(buffer, bytes_read);
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address += bytes_read;
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size -= bytes_read;
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} while (!has_size || size > 0);
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LOG(ERROR) << "unterminated string";
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return false;
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}
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} // namespace crashpad
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