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Kernel: Remap regions after changing purgeable VM object volatile flag

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Otherwise we could end up with stale page table mappings that give us
erroneous Protection Violation faults when accessing valid addresses.
This commit is contained in:
Andreas Kling 2021-08-03 10:21:49 +02:00
parent 7a8efa7771
commit 821a6e8b4c
Notes: sideshowbarker 2024-07-18 07:33:03 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/821a6e8b4ce
1 changed files with 3 additions and 0 deletions
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3
Kernel/VM/AnonymousVMObject.cpp
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@ -230,6 +230,8 @@ KResult AnonymousVMObject::set_volatile(bool is_volatile, bool& was_purged)
m_volatile = true;
m_was_purged = false;
for_each_region([&](auto& region) { region.remap(); });
return KSuccess;
}
// When a VMObject is made non-volatile, we try to commit however many pages are not currently available.
@ -258,6 +260,7 @@ KResult AnonymousVMObject::set_volatile(bool is_volatile, bool& was_purged)
m_volatile = false;
m_was_purged = false;
for_each_region([&](auto& region) { region.remap(); });
return KSuccess;
}