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UserspaceEmulator: Update memory protection of underlying pages

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If a MmapRegion is file backed, we need to call mprotect on its
underlying pages.
This commit is contained in:
Itamar 2020-11-23 22:38:29 +02:00 • committed by Andreas Kling
parent 93b68f5566
commit d2262b8f6d
2 changed files with 11 additions and 6 deletions
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10
DevTools/UserspaceEmulator/MmapRegion.cpp
View file

@ -207,4 +207,14 @@ void MmapRegion::write64(u32 offset, ValueWithShadow<u64> value)
*reinterpret_cast<u64*>(m_shadow_data + offset) = value.shadow();
}
void MmapRegion::set_prot(int prot)
{
set_readable(prot & PROT_READ);
set_writable(prot & PROT_WRITE);
set_executable(prot & PROT_EXEC);
if (m_file_backed) {
mprotect(m_data, size(), prot);
}
}
}

7
DevTools/UserspaceEmulator/MmapRegion.h
View file

@ -56,12 +56,7 @@ public:
bool is_malloc_block() const { return m_malloc; }
void set_malloc(bool b) { m_malloc = b; }
void set_prot(int prot)
{
set_readable(prot & PROT_READ);
set_writable(prot & PROT_WRITE);
set_executable(prot & PROT_EXEC);
}
void set_prot(int prot);
MallocRegionMetadata* malloc_metadata() { return m_malloc_metadata; }
void set_malloc_metadata(Badge<MallocTracer>, NonnullOwnPtr<MallocRegionMetadata> metadata) { m_malloc_metadata = move(metadata); }