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Kernel: Generate a coredump file when a process crashes
When a process crashes, we generate a coredump file and write it in /tmp/coredumps/. The coredump file is an ELF file of type ET_CORE. It contains a segment for every userspace memory region of the process, and an additional PT_NOTE segment that contains the registers state for each thread, and a additional data about memory regions (e.g their name).
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Kernel/CoreDump.h
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Kernel/CoreDump.h
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/*
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* Copyright (c) 2019-2020, Jesse Buhagiar <jooster669@gmail.com>
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* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/NonnullRefPtr.h>
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#include <AK/OwnPtr.h>
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#include <Kernel/Forward.h>
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#include <LibELF/exec_elf.h>
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namespace Kernel {
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class Process;
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class CoreDump {
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public:
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static OwnPtr<CoreDump> create(Process&);
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~CoreDump();
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void write();
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// Has to be public for OwnPtr::make
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CoreDump(Process&, NonnullRefPtr<FileDescription>&&);
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private:
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static RefPtr<FileDescription> create_target_file(const Process&);
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void write_elf_header();
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void write_program_headers(size_t notes_size);
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void write_regions();
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void write_notes_segment(ByteBuffer&);
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ByteBuffer create_notes_segment_data() const;
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ByteBuffer create_notes_threads_data() const;
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ByteBuffer create_notes_regions_data() const;
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Process& m_process;
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NonnullRefPtr<FileDescription> m_fd;
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size_t m_num_program_headers;
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};
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}
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