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Kernel: Make Random work on CPUs without rdrand

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- If rdseed is not available, fallback to rdrand.
- If rdrand is not available, block for entropy, or use insecure prng
  depending on if user wants fast or good random.
This commit is contained in:
Peter Elliott 2020-06-27 11:10:01 -06:00 • committed by Andreas Kling
parent 1eb338ab71
commit e1aef94a40
4 changed files with 71 additions and 12 deletions
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2
Kernel/VM/PageDirectory.cpp
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@ -79,7 +79,7 @@ PageDirectory::PageDirectory(Process& process, const RangeAllocator* parent_rang
if (parent_range_allocator) {
m_range_allocator.initialize_from_parent(*parent_range_allocator);
} else {
size_t random_offset = (get_good_random<u32>() % 32 * MB) & PAGE_MASK;
size_t random_offset = (get_fast_random<u32>() % 32 * MB) & PAGE_MASK;
u32 base = userspace_range_base + random_offset;
m_range_allocator.initialize_with_range(VirtualAddress(base), userspace_range_ceiling - base);
}