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vm_native.cpp: Fix possible weakness of map_self()

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elad335 2025-04-29 14:26:46 +03:00 • committed by Elad
parent 1f81d42416
commit 79b63556bb
1 changed files with 12 additions and 8 deletions
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20
rpcs3/util/vm_native.cpp
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@ -969,20 +969,24 @@ namespace utils
{
void* ptr = m_ptr;
while (!ptr)
for (void* mapped = nullptr; !ptr;)
{
const auto mapped = this->map(nullptr, prot);
if (!mapped)
{
mapped = this->map(nullptr, prot);
}
// Install mapped memory
if (!m_ptr.compare_exchange(ptr, mapped))
{
// Mapped already, nothing to do.
this->unmap(mapped);
}
else
if (m_ptr.compare_exchange(ptr, mapped))
{
ptr = mapped;
}
else if (ptr)
{
// Mapped already, nothing to do.
ensure(ptr != mapped);
this->unmap(mapped);
}
}
return static_cast<u8*>(ptr);