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0a8985cd20
64-bit ARM's Top-Byte-Ignore enables features such as memory tagging. https://www.kernel.org/doc/html/latest/arm64/tagged-address-abi.html Android 11 will start using memory tagging on some devices. https://source.android.com/devices/tech/debug/tagged-pointers Crashpad needs to remove the tags from pointers before comparing to addresses or using with system calls. Bug: crashpad:364 Change-Id: I67c6b9a4a86d090e1d139de727eb06d9e222cc25 Reviewed-on: https://chromium-review.googlesource.com/c/crashpad/crashpad/+/3078500 Reviewed-by: Mark Mentovai <mark@chromium.org> Commit-Queue: Joshua Peraza <jperaza@chromium.org>
77 lines
2.4 KiB
C++
77 lines
2.4 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/process/process_memory_linux.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 <limits>
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#include "base/logging.h"
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#include "base/posix/eintr_wrapper.h"
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#include "build/build_config.h"
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#include "util/file/filesystem.h"
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#include "util/linux/ptrace_connection.h"
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namespace crashpad {
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ProcessMemoryLinux::ProcessMemoryLinux(PtraceConnection* connection)
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: ProcessMemory(), mem_fd_(), ignore_top_byte_(false) {
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#if defined(ARCH_CPU_ARM_FAMILY)
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if (connection->Is64Bit()) {
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ignore_top_byte_ = true;
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}
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#endif // ARCH_CPU_ARM_FAMILY
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char path[32];
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snprintf(path, sizeof(path), "/proc/%d/mem", connection->GetProcessID());
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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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read_up_to_ = [this](VMAddress address, size_t size, void* buffer) {
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ssize_t bytes_read =
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HANDLE_EINTR(pread64(mem_fd_.get(), buffer, size, address));
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if (bytes_read < 0) {
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PLOG(ERROR) << "pread64";
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}
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return bytes_read;
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};
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return;
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}
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read_up_to_ = std::bind(&PtraceConnection::ReadUpTo,
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connection,
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std::placeholders::_1,
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std::placeholders::_2,
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std::placeholders::_3);
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}
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ProcessMemoryLinux::~ProcessMemoryLinux() {}
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VMAddress ProcessMemoryLinux::PointerToAddress(VMAddress address) const {
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return ignore_top_byte_ ? address & 0x00ffffffffffffff : address;
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}
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ssize_t ProcessMemoryLinux::ReadUpTo(VMAddress address,
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size_t size,
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void* buffer) const {
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DCHECK_LE(size, size_t{std::numeric_limits<ssize_t>::max()});
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return read_up_to_(PointerToAddress(address), size, buffer);
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}
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} // namespace crashpad
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