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Fix typo in pg_srand48 (srand48 in older branches).

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">" should be ">>".  This typo results in failure to use all of the bits
of the provided seed.

This might rise to the level of a security bug if we were relying on
srand48 for any security-critical purposes, but we are not --- in fact,
it's not used at all unless the platform lacks srandom(), which is
improbable.  Even on such a platform the exposure seems minimal.

Reported privately by Andres Freund.
This commit is contained in:
Tom Lane 2011-09-03 16:17:39 -04:00
parent 7c0e1a28ac
commit b6cfede8b6
1 changed files with 1 additions and 1 deletions
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2
src/port/erand48.c
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@ -92,7 +92,7 @@ srand48(long seed)
{
_rand48_seed[0] = RAND48_SEED_0;
_rand48_seed[1] = (unsigned short) seed;
_rand48_seed[2] = (unsigned short) (seed > 16);
_rand48_seed[2] = (unsigned short) (seed >> 16);
_rand48_mult[0] = RAND48_MULT_0;
_rand48_mult[1] = RAND48_MULT_1;
_rand48_mult[2] = RAND48_MULT_2;