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Kernel: Purging a page should point it back to the shared zero page

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Anonymous VM objects should never have null entries in their physical
page list. Instead, "empty" or untouched pages should refer to the
shared zero page.

Fixes #1237.
This commit is contained in:
Andreas Kling 2020-02-18 09:54:34 +01:00
parent 52c76aa9bf
commit 4b16ac0034
1 changed files with 1 additions and 1 deletions
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2
Kernel/VM/PurgeableVMObject.cpp
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@ -76,7 +76,7 @@ int PurgeableVMObject::purge_impl()
for (size_t i = 0; i < m_physical_pages.size(); ++i) {
if (m_physical_pages[i])
++purged_page_count;
m_physical_pages[i] = nullptr;
m_physical_pages[i] = MM.shared_zero_page();
}
m_was_purged = true;