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Kernel: Preserve CoW bits when splitting VM regions

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This commit is contained in:
Andreas Kling 2020-01-25 17:57:10 +01:00
parent 7cc0b18f65
commit f4e7aecec2
1 changed files with 7 additions and 1 deletions
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8
Kernel/Process.cpp
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@ -167,7 +167,13 @@ static unsigned prot_to_region_access_flags(int prot)
Region& Process::allocate_split_region(const Region& source_region, const Range& range, size_t offset_in_vmobject) Region& Process::allocate_split_region(const Region& source_region, const Range& range, size_t offset_in_vmobject)
{ {
return add_region(Region::create_user_accessible(range, source_region.vmobject(), offset_in_vmobject, source_region.name(), source_region.access())); auto& region = add_region(Region::create_user_accessible(range, source_region.vmobject(), offset_in_vmobject, source_region.name(), source_region.access()));
size_t page_offset_in_source_region = (offset_in_vmobject - source_region.offset_in_vmobject()) / PAGE_SIZE;
for (size_t i = 0; i < region.page_count(); ++i) {
if (source_region.should_cow(page_offset_in_source_region + i))
region.set_should_cow(i, true);
}
return region;
} }
Region* Process::allocate_region(VirtualAddress vaddr, size_t size, const String& name, int prot, bool commit) Region* Process::allocate_region(VirtualAddress vaddr, size_t size, const String& name, int prot, bool commit)