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Kernel: Generate a coredump file when a process crashes

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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).
This commit is contained in:
Itamar 2020-11-06 10:09:51 +02:00 • committed by Andreas Kling
parent efe4da57df
commit b4842d33bb
11 changed files with 427 additions and 1 deletions
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65
Kernel/CoreDump.h Normal file
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/*
* Copyright (c) 2019-2020, Jesse Buhagiar <jooster669@gmail.com>
* Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <AK/NonnullRefPtr.h>
#include <AK/OwnPtr.h>
#include <Kernel/Forward.h>
#include <LibELF/exec_elf.h>
namespace Kernel {
class Process;
class CoreDump {
public:
static OwnPtr<CoreDump> create(Process&);
~CoreDump();
void write();
// Has to be public for OwnPtr::make
CoreDump(Process&, NonnullRefPtr<FileDescription>&&);
private:
static RefPtr<FileDescription> create_target_file(const Process&);
void write_elf_header();
void write_program_headers(size_t notes_size);
void write_regions();
void write_notes_segment(ByteBuffer&);
ByteBuffer create_notes_segment_data() const;
ByteBuffer create_notes_threads_data() const;
ByteBuffer create_notes_regions_data() const;
Process& m_process;
NonnullRefPtr<FileDescription> m_fd;
size_t m_num_program_headers;
};
}