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Limit NBuffers and some related values to INT_MAX / BLCKSZ, to prevent

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arithmetic overflow during initial sizing calculations.  This is not
water-tight but it should avoid the grossest sorts of failures.
This commit is contained in:
Tom Lane 2004-10-16 19:08:38 +00:00
parent fdd13f1568
commit f68d05d5ec
1 changed files with 10 additions and 12 deletions
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22
src/backend/utils/misc/guc.c
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@ -10,7 +10,7 @@
* Written by Peter Eisentraut <peter_e@gmx.net>.
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.243 2004/10/12 21:54:42 petere Exp $
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.244 2004/10/16 19:08:38 tgl Exp $
*
*--------------------------------------------------------------------
*/
@ -949,7 +949,7 @@ static struct config_int ConfigureNamesInt[] =
NULL
},
&MaxBackends,
100, 1, INT_MAX, NULL, NULL
100, 1, INT_MAX / BLCKSZ, NULL, NULL
},
{
@ -958,7 +958,7 @@ static struct config_int ConfigureNamesInt[] =
NULL
},
&ReservedBackends,
2, 0, INT_MAX, NULL, NULL
2, 0, INT_MAX / BLCKSZ, NULL, NULL
},
{
@ -967,7 +967,7 @@ static struct config_int ConfigureNamesInt[] =
NULL
},
&NBuffers,
1000, 16, INT_MAX, NULL, NULL
1000, 16, INT_MAX / BLCKSZ, NULL, NULL
},
{
@ -1107,8 +1107,7 @@ static struct config_int ConfigureNamesInt[] =
{
{"max_fsm_relations", PGC_POSTMASTER, RESOURCES_FSM,
gettext_noop("Sets the maximum number of tables and indexes for which free space is "
"tracked."),
gettext_noop("Sets the maximum number of tables and indexes for which free space is tracked."),
NULL
},
&MaxFSMRelations,
@ -1116,8 +1115,7 @@ static struct config_int ConfigureNamesInt[] =
},
{
{"max_fsm_pages", PGC_POSTMASTER, RESOURCES_FSM,
gettext_noop("Sets the maximum number of disk pages for which free space is "
"tracked."),
gettext_noop("Sets the maximum number of disk pages for which free space is tracked."),
NULL
},
&MaxFSMPages,
@ -1129,7 +1127,7 @@ static struct config_int ConfigureNamesInt[] =
gettext_noop("Sets the maximum number of locks per transaction."),
gettext_noop("The shared lock table is sized on the assumption that "
"at most max_locks_per_transaction * max_connections distinct "
"objects will need to be locked at any one time.")
"objects will need to be locked at any one time.")
},
&max_locks_per_xact,
64, 10, INT_MAX, NULL, NULL
@ -1191,7 +1189,7 @@ static struct config_int ConfigureNamesInt[] =
NULL
},
&XLOGbuffers,
8, 4, INT_MAX, NULL, NULL
8, 4, INT_MAX / BLCKSZ, NULL, NULL
},
{
@ -1277,7 +1275,7 @@ static struct config_int ConfigureNamesInt[] =
NULL
},
&Log_RotationAge,
24 * 60, 0, INT_MAX, NULL, NULL
24 * 60, 0, INT_MAX / 60, NULL, NULL
},
{
@ -1286,7 +1284,7 @@ static struct config_int ConfigureNamesInt[] =
NULL
},
&Log_RotationSize,
10 * 1024, 0, INT_MAX, NULL, NULL
10 * 1024, 0, INT_MAX / 1024, NULL, NULL
},
{