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Postgres FD Implementation
Commit a12fc7da authored by Bruce Momjian's avatar Bruce Momjian
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Improve handling of GUC USERLIMIT variables by reorganizing code. Also, 

handle new postgresql.conf values with SIGHUP better by better enforcing
USERLIMIT settings on existing non-super-user backends.
parent 53ddde5b
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Showing with 92 additions and 75 deletions
src/backend/utils/misc/guc.c
View file @ a12fc7da
......@@ -10,7 +10,7 @@
* Written by Peter Eisentraut <peter_e@gmx.net>.
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.195 2004/04/01 21:28:45 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.196 2004/04/05 02:48:09 momjian Exp $
*
*--------------------------------------------------------------------
*/
......@@ -2571,8 +2571,7 @@ set_config_option(const char *name, const char *value,
{
struct config_generic *record;
int elevel;
bool makeDefault;
bool changeVal_orig;
bool makeDefault, changeValOrig = changeVal;
if (context == PGC_SIGHUP || source == PGC_S_DEFAULT)
elevel = DEBUG2;
......@@ -2694,7 +2693,6 @@ set_config_option(const char *name, const char *value,
* to set the reset/session values even if we can't set the variable
* itself.
*/
changeVal_orig = changeVal; /* we might have to reverse this later */
if (record->source > source)
{
if (changeVal && !makeDefault)
......@@ -2703,11 +2701,15 @@ set_config_option(const char *name, const char *value,
name);
return true;
}
changeVal = false; /* we won't change the variable itself */
changeVal = false; /* this might be reset in USERLIMIT */
}
/*
* Evaluate value and set variable
* Evaluate value and set variable.
* USERLIMIT checks two things: 1) is the user making a change
* that is blocked by an administrator setting. 2) is the administrator
* changing a setting and doing a SIGHUP that requires us to override
* a user setting.
*/
switch (record->vartype)
{
......@@ -2726,11 +2728,13 @@ set_config_option(const char *name, const char *value,
name)));
return false;
}
/* Limit non-superuser changes */
if (record->context == PGC_USERLIMIT &&
source > PGC_S_UNPRIVILEGED &&
newval < conf->reset_val &&
!superuser())
IsUnderPostmaster && !superuser())
{
if (newval < conf->reset_val)
{
/* Limit non-superuser changes */
if (source > PGC_S_UNPRIVILEGED)
{
ereport(elevel,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
......@@ -2739,13 +2743,15 @@ set_config_option(const char *name, const char *value,
errhint("Must be superuser to change this value to false.")));
return false;
}
/* Honor change to config file with SIGHUP */
if (record->context == PGC_USERLIMIT &&
source < PGC_S_UNPRIVILEGED &&
record->reset_source > PGC_S_UNPRIVILEGED &&
newval > conf->reset_val &&
!superuser())
changeVal = changeVal_orig;
}
if (newval > *conf->variable)
{
/* Allow change if admin should override */
if (source < PGC_S_UNPRIVILEGED &&
record->source > PGC_S_UNPRIVILEGED)
changeVal = changeValOrig;
}
}
}
else
{
......@@ -2822,27 +2828,35 @@ set_config_option(const char *name, const char *value,
newval, name, conf->min, conf->max)));
return false;
}
/* Limit non-superuser changes */
if (record->context == PGC_USERLIMIT &&
source > PGC_S_UNPRIVILEGED &&
conf->reset_val != 0 &&
(newval > conf->reset_val || newval == 0) &&
!superuser())
IsUnderPostmaster && !superuser())
{
/* handle log_min_duration_statement, -1=disable */
if ((newval != -1 && conf->reset_val != -1 &&
newval > conf->reset_val) || /* increase duration */
(newval == -1 && conf->reset_val != -1)) /* turn off */
{
/* Limit non-superuser changes */
if (source > PGC_S_UNPRIVILEGED)
{
ereport(elevel,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("permission denied to set parameter \"%s\"",
name),
errhint("Must be superuser to increase this value or set it to zero.")));
errhint("Must be superuser to increase this value or turn it off.")));
return false;
}
/* Honor change to config file with SIGHUP */
if (record->context == PGC_USERLIMIT &&
source < PGC_S_UNPRIVILEGED &&
record->reset_source > PGC_S_UNPRIVILEGED &&
newval < conf->reset_val && newval != 0 &&
!superuser())
changeVal = changeVal_orig;
}
/* Allow change if admin should override */
if ((newval != -1 && *conf->variable != -1 &&
newval < *conf->variable) || /* decrease duration */
(newval != -1 && *conf->variable == -1)) /* turn on */
{
if (source < PGC_S_UNPRIVILEGED &&
record->source > PGC_S_UNPRIVILEGED)
changeVal = changeValOrig;
}
}
}
else
{
......@@ -2919,26 +2933,25 @@ set_config_option(const char *name, const char *value,
newval, name, conf->min, conf->max)));
return false;
}
/* Limit non-superuser changes */
if (record->context == PGC_USERLIMIT &&
source > PGC_S_UNPRIVILEGED &&
newval > conf->reset_val &&
!superuser())
IsUnderPostmaster && !superuser())
/* No REAL PGC_USERLIMIT */
{
/* Limit non-superuser changes */
if (source > PGC_S_UNPRIVILEGED)
{
ereport(elevel,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
errmsg("permission denied to set parameter \"%s\"",
name),
errhint("Must be superuser to increase this value.")));
errhint("Must be superuser to increase this value or turn it off.")));
return false;
}
/* Honor change to config file with SIGHUP */
if (record->context == PGC_USERLIMIT &&
source < PGC_S_UNPRIVILEGED &&
record->reset_source > PGC_S_UNPRIVILEGED &&
newval < conf->reset_val &&
!superuser())
changeVal = changeVal_orig;
/* Allow change if admin should override */
if (source < PGC_S_UNPRIVILEGED &&
record->source > PGC_S_UNPRIVILEGED)
changeVal = false;
}
}
else
{
......@@ -3009,20 +3022,20 @@ set_config_option(const char *name, const char *value,
}
if (record->context == PGC_USERLIMIT &&
*conf->variable)
IsUnderPostmaster && !superuser())
{
int old_int_value,
new_int_value;
/* all USERLIMIT strings are message levels */
assign_msglvl(&old_int_value, conf->reset_val,
true, source);
assign_msglvl(&new_int_value, newval,
true, source);
assign_msglvl(&old_int_value, conf->reset_val,
true, source);
if (new_int_value > old_int_value)
{
/* Limit non-superuser changes */
if (source > PGC_S_UNPRIVILEGED &&
new_int_value > old_int_value &&
!superuser())
if (source > PGC_S_UNPRIVILEGED)
{
ereport(elevel,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
......@@ -3031,12 +3044,16 @@ set_config_option(const char *name, const char *value,
errhint("Must be superuser to increase this value.")));
return false;
}
/* Honor change to config file with SIGHUP */
}
/* Allow change if admin should override */
assign_msglvl(&old_int_value, *conf->variable,
true, source);
if (new_int_value < old_int_value)
{
if (source < PGC_S_UNPRIVILEGED &&
record->reset_source > PGC_S_UNPRIVILEGED &&
newval < conf->reset_val &&
!superuser())
changeVal = changeVal_orig;
record->source > PGC_S_UNPRIVILEGED)
changeVal = changeValOrig;
}
}
}
else if (conf->reset_val)
......
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