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LibCoreDump+CrashDaemon: Compress coredumps

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Most coredumps contain large amounts of consecutive null bytes and as
such are a prime candidate for compression.

This commit makes CrashDaemon compress files once the kernel finishes
emitting them, as well as adds the functionality needed in LibCoreDump
to then parse them.
This commit is contained in:
Idan Horowitz 2021-03-26 18:46:20 +03:00 • committed by Andreas Kling
parent b8f462a78b
commit 9f656b6fa9
8 changed files with 70 additions and 15 deletions
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2
Userland/Libraries/LibCoreDump/CMakeLists.txt
View file

@ -4,4 +4,4 @@ set(SOURCES
)
serenity_lib(LibCoreDump coredump)
target_link_libraries(LibCoreDump LibC LibCore LibDebug)
target_link_libraries(LibCoreDump LibC LibCompress LibCore LibDebug)

19
Userland/Libraries/LibCoreDump/Reader.cpp
View file

@ -26,6 +26,7 @@
#include <AK/JsonObject.h>
#include <AK/JsonValue.h>
#include <LibCompress/Gzip.h>
#include <LibCoreDump/Reader.h>
#include <signal_numbers.h>
#include <string.h>
@ -37,12 +38,12 @@ OwnPtr<Reader> Reader::create(const String& path)
auto file_or_error = MappedFile::map(path);
if (file_or_error.is_error())
return {};
return adopt_own(*new Reader(file_or_error.release_value()));
return adopt_own(*new Reader(file_or_error.value()->bytes()));
}
Reader::Reader(NonnullRefPtr<MappedFile> coredump_file)
: m_coredump_file(move(coredump_file))
, m_coredump_image(m_coredump_file->bytes())
Reader::Reader(ReadonlyBytes coredump_bytes)
: m_coredump_buffer(decompress_coredump(coredump_bytes))
, m_coredump_image(m_coredump_buffer.bytes())
{
size_t index = 0;
m_coredump_image.for_each_program_header([this, &index](auto pheader) {
@ -56,6 +57,16 @@ Reader::Reader(NonnullRefPtr<MappedFile> coredump_file)
VERIFY(m_notes_segment_index != -1);
}
ByteBuffer Reader::decompress_coredump(const ReadonlyBytes& raw_coredump)
{
if (!Compress::GzipDecompressor::is_likely_compressed(raw_coredump))
return ByteBuffer::copy(raw_coredump); // handle old format core dumps (uncompressed)
auto decompressed_coredump = Compress::GzipDecompressor::decompress_all(raw_coredump);
if (!decompressed_coredump.has_value())
return ByteBuffer::copy(raw_coredump); // if we didnt manage to decompress it, try and parse it as decompressed core dump
return decompressed_coredump.value();
}
Reader::~Reader()
{
}

6
Userland/Libraries/LibCoreDump/Reader.h
View file

@ -70,7 +70,9 @@ public:
HashMap<String, String> metadata() const;
private:
Reader(NonnullRefPtr<MappedFile>);
Reader(ReadonlyBytes);
static ByteBuffer decompress_coredump(const ReadonlyBytes&);
class NotesEntryIterator {
public:
@ -92,7 +94,7 @@ private:
// as getters with the appropriate (non-JsonValue) types.
const JsonObject process_info() const;
NonnullRefPtr<MappedFile> m_coredump_file;
ByteBuffer m_coredump_buffer;
ELF::Image m_coredump_image;
ssize_t m_notes_segment_index { -1 };
};