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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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3
Kernel/Random.cpp
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@ -69,6 +69,7 @@ KernelRng::KernelRng()
void KernelRng::wait_for_entropy()
{
if (!resource().is_ready()) {
dbgln("Entropy starvation...");
m_seed_queue.wait_on({}, "KernelRng");
}
}
@ -80,7 +81,7 @@ void KernelRng::wake_if_ready()
}
}
size_t EntropySource::next_source { 0 };
size_t EntropySource::next_source { static_cast<size_t>(EntropySource::Static::MaxHardcodedSourceIndex) };
void get_good_random_bytes(u8* buffer, size_t buffer_size)
{