[libc] Always use a non-zero seed for the (non-crypto) RNG
The non-cryptographic RNG implemented by random() has the property that a seed value of zero will result in a generated sequence of all-zero values. This situation can arise if currticks() returns zero at start of day. Work around this problem by falling back to a fixed non-zero seed if necessary. This has no effect on the separate DRBG used by cryptographic code. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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@ -18,6 +18,8 @@ static int32_t rnd_seed = 0;
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*/
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void srandom ( unsigned int seed ) {
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rnd_seed = seed;
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if ( ! rnd_seed )
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rnd_seed = 4; /* Chosen by fair dice roll */
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}
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/**
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