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winstrexandClaude Opus 5.5
8f9efc25f2
std::random_device in libstdc++ reads RDSEED on x86 Linux. On an AMD EPYC 9V45 (Zen 5) CI runner its 32-bit results repeat about 130 times in 65536 draws, so guest_posix_random fails. libc now exports HostEntropy_nid_no_patch, which uses getentropy (rand_s on Windows) and throws when the OS cannot provide entropy. arc4random, arc4random_buf, sceRandomGetRandomNumber, /dev/random and /dev/urandom reads, std::_Random_device and sceKernelUuidCreate use it, and the arc4random and random device TechnicalDebt entries say so. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
34 lines
1.1 KiB
C++
34 lines
1.1 KiB
C++
#ifdef _WIN32
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#define _CRT_RAND_S
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#endif
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#include "prx/libc/include/HostEntropy.hpp"
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#include <algorithm>
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#include <cerrno>
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#include <cstdlib>
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#include <cstring>
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#include <system_error>
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#ifdef __APPLE__
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#include <sys/random.h>
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#elif !defined(_WIN32)
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#include <unistd.h>
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#endif
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void HostEntropy_nid_no_patch(void* buffer, std::size_t size) {
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auto* bytes = static_cast<unsigned char*>(buffer);
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#ifdef _WIN32
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for (std::size_t offset = 0; offset < size; offset += sizeof(unsigned int)) {
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unsigned int value = 0;
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if (const errno_t error = rand_s(&value); error != 0)
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throw std::system_error(error, std::generic_category(), "HostEntropy: rand_s failed");
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std::memcpy(bytes + offset, &value, std::min(sizeof(value), size - offset));
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}
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#else
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constexpr std::size_t MaxChunk = 256;
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for (std::size_t offset = 0; offset < size; offset += MaxChunk) {
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if (getentropy(bytes + offset, std::min(MaxChunk, size - offset)) != 0)
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throw std::system_error(errno, std::generic_category(), "HostEntropy: getentropy failed");
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}
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#endif
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}
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