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Kernel: Work using copies of specific region data during a coredump

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This limits our interaction with the "real" region tree (and therefore
its lock) to the time where we actually read from the user address
space.
This commit is contained in:
Tim Schumacher 2022-08-23 20:51:42 +02:00 • committed by Andreas Kling
parent 066c5acee1
commit 32a03cffeb
2 changed files with 148 additions and 75 deletions
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45
Kernel/Coredump.h
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@ -8,8 +8,10 @@
#pragma once
#include <AK/OwnPtr.h>
#include <AK/Vector.h>
#include <Kernel/Forward.h>
#include <Kernel/Library/NonnullLockRefPtr.h>
#include <Kernel/Memory/Region.h>
namespace Kernel {
@ -21,7 +23,47 @@ public:
ErrorOr<void> write();
private:
Coredump(NonnullLockRefPtr<Process>, NonnullLockRefPtr<OpenFileDescription>);
class FlatRegionData {
public:
explicit FlatRegionData(Memory::Region const& region, NonnullOwnPtr<KString> name)
: m_access(region.access())
, m_is_executable(region.is_executable())
, m_is_kernel(region.is_kernel())
, m_is_readable(region.is_readable())
, m_is_writable(region.is_writable())
, m_name(move(name))
, m_page_count(region.page_count())
, m_size(region.size())
, m_vaddr(region.vaddr())
{
}
auto access() const { return m_access; }
auto name() const { return m_name->view(); }
auto is_executable() const { return m_is_executable; }
auto is_kernel() const { return m_is_kernel; }
auto is_readable() const { return m_is_readable; }
auto is_writable() const { return m_is_writable; }
auto page_count() const { return m_page_count; }
auto size() const { return m_size; }
auto vaddr() const { return m_vaddr; }
bool looks_like_userspace_heap_region() const;
bool is_consistent_with_region(Memory::Region const& region) const;
private:
Memory::Region::Access m_access;
bool m_is_executable;
bool m_is_kernel;
bool m_is_readable;
bool m_is_writable;
NonnullOwnPtr<KString> m_name;
size_t m_page_count;
size_t m_size;
VirtualAddress m_vaddr;
};
Coredump(NonnullLockRefPtr<Process>, NonnullLockRefPtr<OpenFileDescription>, Vector<FlatRegionData>);
static ErrorOr<NonnullLockRefPtr<OpenFileDescription>> try_create_target_file(Process const&, StringView output_path);
ErrorOr<void> write_elf_header();
@ -38,6 +80,7 @@ private:
NonnullLockRefPtr<Process> m_process;
NonnullLockRefPtr<OpenFileDescription> m_description;
size_t m_num_program_headers { 0 };
Vector<FlatRegionData> m_regions;
};
}