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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>
56 lines
1.7 KiB
C++
56 lines
1.7 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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#ifndef CRASHPAD_UTIL_PROCESS_PROCESS_MEMORY_LINUX_H_
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#define CRASHPAD_UTIL_PROCESS_PROCESS_MEMORY_LINUX_H_
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#include <sys/types.h>
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#include <functional>
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#include <string>
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#include "base/files/scoped_file.h"
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#include "util/misc/address_types.h"
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#include "util/process/process_memory.h"
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namespace crashpad {
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class PtraceConnection;
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//! \brief Accesses the memory of another Linux process.
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class ProcessMemoryLinux final : public ProcessMemory {
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public:
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explicit ProcessMemoryLinux(PtraceConnection* connection);
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ProcessMemoryLinux(const ProcessMemoryLinux&) = delete;
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ProcessMemoryLinux& operator=(const ProcessMemoryLinux&) = delete;
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~ProcessMemoryLinux();
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//! \brief Returns the input pointer with any non-addressing bits, such as
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//! tags removed.
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VMAddress PointerToAddress(VMAddress address) const;
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private:
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ssize_t ReadUpTo(VMAddress address, size_t size, void* buffer) const override;
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std::function<ssize_t(VMAddress, size_t, void*)> read_up_to_;
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base::ScopedFD mem_fd_;
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bool ignore_top_byte_;
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};
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} // namespace crashpad
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#endif // CRASHPAD_UTIL_PROCESS_PROCESS_MEMORY_LINUX_H_
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