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Kernel: clamp msync address range instead of calling contains

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Bananymous
2026-05-13 20:03:37 +03:00
parent 212ab010a5
commit dd8a9b1793
1 changed files with 3 additions and 4 deletions
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5
kernel/kernel/Memory/FileBackedRegion.cpp
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@@ -99,12 +99,11 @@ namespace Kernel
if (m_type != Type::SHARED)
return {};
const vaddr_t first_page = address & PAGE_ADDR_MASK;
const vaddr_t last_page = BAN::Math::div_round_up<vaddr_t>(address + size, PAGE_SIZE) * PAGE_SIZE;
const vaddr_t first_page = BAN::Math::max(m_vaddr, address) & PAGE_ADDR_MASK;
const vaddr_t last_page = BAN::Math::div_round_up(BAN::Math::min(m_vaddr + m_size, address + size), PAGE_SIZE) * PAGE_SIZE;
RWLockRDGuard _(m_shared_data->rw_lock);
for (vaddr_t page_addr = first_page; page_addr < last_page; page_addr += PAGE_SIZE)
if (contains(page_addr))
m_shared_data->sync_no_lock((m_offset + page_addr - m_vaddr) / PAGE_SIZE);
return {};