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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>
106 lines
3.9 KiB
C++
106 lines
3.9 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_LINUX_PROCESS_MEMORY_H_
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#define CRASHPAD_UTIL_LINUX_PROCESS_MEMORY_H_
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#include <sys/types.h>
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#include <string>
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#include "base/files/scoped_file.h"
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#include "base/macros.h"
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#include "util/linux/address_types.h"
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namespace crashpad {
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//! \brief Accesses the memory of another process.
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class ProcessMemory {
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public:
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ProcessMemory();
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~ProcessMemory();
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//! \brief Initializes this object to read the memory of a process whose ID
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//! is \a pid.
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//!
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//! This method must be called successfully prior to calling any other method
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//! in this class.
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//!
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//! \param[in] pid The process ID of a target process.
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//!
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//! \return `true` on success, `false` on failure with a message logged.
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bool Initialize(pid_t pid);
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//! \brief Copies memory from the target process into a caller-provided buffer
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//! in the current process.
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//!
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//! \param[in] address The address, in the target process' address space, of
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//! the memory region to copy.
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//! \param[in] size The size, in bytes, of the memory region to copy.
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//! \a buffer must be at least this size.
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//! \param[out] buffer The buffer into which the contents of the other
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//! process' memory will be copied.
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//!
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//! \return `true` on success, with \a buffer filled appropriately. `false` on
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//! failure, with a message logged.
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bool Read(LinuxVMAddress address, size_t size, void* buffer) const;
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//! \brief Reads a `NUL`-terminated C string from the target process into a
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//! string in the current process.
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//!
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//! The length of the string need not be known ahead of time. This method will
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//! read contiguous memory until a `NUL` terminator is found.
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//!
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//! \param[in] address The address, in the target process’s address space, of
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//! the string to copy.
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//! \param[out] string The string read from the other process.
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//!
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//! \return `true` on success, with \a string set appropriately. `false` on
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//! failure, with a message logged. Failures can occur, for example, when
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//! encountering unmapped or unreadable pages.
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bool ReadCString(LinuxVMAddress address, std::string* string) const;
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//! \brief Reads a `NUL`-terminated C string from the target process into a
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//! string in the current process.
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//!
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//! \param[in] address The address, in the target process’s address space, of
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//! the string to copy.
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//! \param[in] size The maximum number of bytes to read. The string is
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//! required to be `NUL`-terminated within this many bytes.
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//! \param[out] string The string read from the other process.
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//!
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//! \return `true` on success, with \a string set appropriately. `false` on
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//! failure, with a message logged. Failures can occur, for example, when
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//! a `NUL` terminator is not found within \a size bytes, or when
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//! encountering unmapped or unreadable pages.
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bool ReadCStringSizeLimited(LinuxVMAddress address,
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size_t size,
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std::string* string) const;
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private:
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bool 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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base::ScopedFD mem_fd_;
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pid_t pid_;
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DISALLOW_COPY_AND_ASSIGN(ProcessMemory);
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};
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} // namespace crashpad
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#endif // CRASHPAD_UTIL_LINUX_PROCESS_MEMORY_H_
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