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Kernel: Make use of interrupts as an entropy source

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Booting old computers without RDRAND/RDSEED and without a disk makes
the system severely starved for entropy. Uses interrupts as a source
to side-step that issue.

Also warn whenever the system is starved of entropy, because that's
a non-obvious failure mode.
This commit is contained in:
Jean-Baptiste Boric 2021-01-24 18:17:54 +01:00 • committed by Andreas Kling
parent cb89d3b780
commit 7eaefa5aa6
3 changed files with 16 additions and 2 deletions
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11
Kernel/Random.h
View file

@ -147,11 +147,21 @@ class EntropySource {
};
public:
enum class Static : size_t {
Interrupts,
MaxHardcodedSourceIndex,
};
EntropySource()
: m_source(next_source++)
{
}
EntropySource(Static hardcoded_source)
: m_source(static_cast<size_t>(hardcoded_source))
{
}
template<typename T>
void add_random_event(const T& event_data)
{
@ -166,7 +176,6 @@ private:
static size_t next_source;
size_t m_pool { 0 };
size_t m_source;
Lock m_lock;
};
// NOTE: These API's are primarily about expressing intent/needs in the calling code.