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Kernel: Track user accessibility per Region.

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Region now has is_user_accessible(), which informs the memory manager how
to map these pages. Previously, we were just passing a "bool user_allowed"
to various functions and I'm not at all sure that any of that was correct.

All the Region constructors are now hidden, and you must go through one of
these helpers to construct a region:

- Region::create_user_accessible(...)
- Region::create_kernel_only(...)

That ensures that we don't accidentally create a Region without specifying
user accessibility. :^)
This commit is contained in:
Andreas Kling
2019-07-19 16:09:34 +02:00
parent 4547a301c4
commit 5b2447a27b
6 changed files with 73 additions and 30 deletions
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8
Kernel/Process.cpp
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@@ -99,19 +99,19 @@ Region* Process::allocate_region(VirtualAddress vaddr, size_t size, const String
auto range = allocate_range(vaddr, size);
if (!range.is_valid())
return nullptr;
m_regions.append(adopt(*new Region(range, move(name), prot_to_region_access_flags(prot))));
m_regions.append(Region::create_user_accessible(range, name, prot_to_region_access_flags(prot)));
MM.map_region(*this, m_regions.last());
if (commit)
m_regions.last().commit();
return &m_regions.last();
}
Region* Process::allocate_file_backed_region(VirtualAddress vaddr, size_t size, RefPtr<Inode>&& inode, const String& name, int prot)
Region* Process::allocate_file_backed_region(VirtualAddress vaddr, size_t size, NonnullRefPtr<Inode> inode, const String& name, int prot)
{
auto range = allocate_range(vaddr, size);
if (!range.is_valid())
return nullptr;
m_regions.append(adopt(*new Region(range, move(inode), name, prot_to_region_access_flags(prot))));
m_regions.append(Region::create_user_accessible(range, inode, name, prot_to_region_access_flags(prot)));
MM.map_region(*this, m_regions.last());
return &m_regions.last();
}
@@ -122,7 +122,7 @@ Region* Process::allocate_region_with_vmo(VirtualAddress vaddr, size_t size, Non
if (!range.is_valid())
return nullptr;
offset_in_vmo &= PAGE_MASK;
m_regions.append(adopt(*new Region(range, move(vmo), offset_in_vmo, name, prot_to_region_access_flags(prot))));
m_regions.append(Region::create_user_accessible(range, move(vmo), offset_in_vmo, name, prot_to_region_access_flags(prot)));
MM.map_region(*this, m_regions.last());
return &m_regions.last();
}