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Auto-seed random so user's can't request random values based on

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our postmaster random seed used from cancel.
This commit is contained in:
Bruce Momjian 1998-06-09 19:20:59 +00:00
parent 19a95d9742
commit 755c00a360
1 changed files with 17 additions and 1 deletions
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18
src/backend/utils/adt/misc.c
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@ -7,12 +7,13 @@
* *
* *
* IDENTIFICATION * IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/adt/misc.c,v 1.12 1998/02/24 03:47:26 scrappy Exp $ * $Header: /cvsroot/pgsql/src/backend/utils/adt/misc.c,v 1.13 1998/06/09 19:20:59 momjian Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
#include <sys/types.h> #include <sys/types.h>
#include <sys/file.h> #include <sys/file.h>
#include <time.h>
#include "postgres.h" #include "postgres.h"
#include "utils/datum.h" #include "utils/datum.h"
#include "catalog/pg_type.h" #include "catalog/pg_type.h"
@ -60,6 +61,9 @@ nonnullvalue(Datum value, bool *isNull)
* will return about 1/10 of the tuples in TEMP * will return about 1/10 of the tuples in TEMP
* *
*/ */
static bool random_initialized = false;
bool bool
oidrand(Oid o, int32 X) oidrand(Oid o, int32 X)
{ {
@ -68,6 +72,17 @@ oidrand(Oid o, int32 X)
if (X == 0) if (X == 0)
return true; return true;
/*
* We do this because the cancel key is actually a random, so we don't
* want them to be able to request random numbers using our postmaster
* seeded value.
*/
if (!random_initialized)
{
srandom((unsigned int)time(NULL));
random_initialized = true;
}
result = (random() % X == 0); result = (random() % X == 0);
return result; return result;
} }
@ -81,6 +96,7 @@ bool
oidsrand(int32 X) oidsrand(int32 X)
{ {
srand(X); srand(X);
random_initialized = true;
return true; return true;
} }