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.
This commit is contained in:
Bruce Momjian
parent
53ddde5b74
commit
a12fc7dae6
@ -10,7 +10,7 @@
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* Written by Peter Eisentraut <peter_e@gmx.net>.
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.195 2004/04/01 21:28:45 tgl Exp $
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* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.196 2004/04/05 02:48:09 momjian Exp $
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*
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*--------------------------------------------------------------------
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*/
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@ -2571,8 +2571,7 @@ set_config_option(const char *name, const char *value,
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{
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struct config_generic *record;
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int elevel;
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bool makeDefault;
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bool changeVal_orig;
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bool makeDefault, changeValOrig = changeVal;
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if (context == PGC_SIGHUP || source == PGC_S_DEFAULT)
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elevel = DEBUG2;
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@ -2694,7 +2693,6 @@ set_config_option(const char *name, const char *value,
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* to set the reset/session values even if we can't set the variable
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* itself.
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*/
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changeVal_orig = changeVal; /* we might have to reverse this later */
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if (record->source > source)
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{
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if (changeVal && !makeDefault)
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@ -2703,11 +2701,15 @@ set_config_option(const char *name, const char *value,
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name);
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return true;
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}
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changeVal = false; /* we won't change the variable itself */
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changeVal = false; /* this might be reset in USERLIMIT */
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}
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/*
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* Evaluate value and set variable
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* Evaluate value and set variable.
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* USERLIMIT checks two things: 1) is the user making a change
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* that is blocked by an administrator setting. 2) is the administrator
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* changing a setting and doing a SIGHUP that requires us to override
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* a user setting.
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*/
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switch (record->vartype)
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{
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@ -2726,26 +2728,30 @@ set_config_option(const char *name, const char *value,
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name)));
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return false;
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}
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/* Limit non-superuser changes */
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if (record->context == PGC_USERLIMIT &&
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source > PGC_S_UNPRIVILEGED &&
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newval < conf->reset_val &&
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!superuser())
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IsUnderPostmaster && !superuser())
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{
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ereport(elevel,
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(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
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errmsg("permission denied to set parameter \"%s\"",
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name),
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errhint("Must be superuser to change this value to false.")));
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return false;
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if (newval < conf->reset_val)
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{
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/* Limit non-superuser changes */
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if (source > PGC_S_UNPRIVILEGED)
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{
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ereport(elevel,
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(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
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errmsg("permission denied to set parameter \"%s\"",
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name),
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errhint("Must be superuser to change this value to false.")));
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return false;
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}
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}
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if (newval > *conf->variable)
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{
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/* Allow change if admin should override */
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if (source < PGC_S_UNPRIVILEGED &&
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record->source > PGC_S_UNPRIVILEGED)
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changeVal = changeValOrig;
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}
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}
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/* Honor change to config file with SIGHUP */
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if (record->context == PGC_USERLIMIT &&
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source < PGC_S_UNPRIVILEGED &&
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record->reset_source > PGC_S_UNPRIVILEGED &&
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newval > conf->reset_val &&
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!superuser())
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changeVal = changeVal_orig;
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}
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else
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{
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@ -2822,27 +2828,35 @@ set_config_option(const char *name, const char *value,
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newval, name, conf->min, conf->max)));
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return false;
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}
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/* Limit non-superuser changes */
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if (record->context == PGC_USERLIMIT &&
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source > PGC_S_UNPRIVILEGED &&
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conf->reset_val != 0 &&
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(newval > conf->reset_val || newval == 0) &&
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!superuser())
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IsUnderPostmaster && !superuser())
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{
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ereport(elevel,
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(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
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errmsg("permission denied to set parameter \"%s\"",
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name),
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errhint("Must be superuser to increase this value or set it to zero.")));
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return false;
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/* handle log_min_duration_statement, -1=disable */
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if ((newval != -1 && conf->reset_val != -1 &&
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newval > conf->reset_val) || /* increase duration */
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(newval == -1 && conf->reset_val != -1)) /* turn off */
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{
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/* Limit non-superuser changes */
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if (source > PGC_S_UNPRIVILEGED)
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{
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ereport(elevel,
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(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
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errmsg("permission denied to set parameter \"%s\"",
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name),
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errhint("Must be superuser to increase this value or turn it off.")));
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return false;
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}
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}
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/* Allow change if admin should override */
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if ((newval != -1 && *conf->variable != -1 &&
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newval < *conf->variable) || /* decrease duration */
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(newval != -1 && *conf->variable == -1)) /* turn on */
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{
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if (source < PGC_S_UNPRIVILEGED &&
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record->source > PGC_S_UNPRIVILEGED)
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changeVal = changeValOrig;
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}
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}
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/* Honor change to config file with SIGHUP */
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if (record->context == PGC_USERLIMIT &&
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source < PGC_S_UNPRIVILEGED &&
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record->reset_source > PGC_S_UNPRIVILEGED &&
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newval < conf->reset_val && newval != 0 &&
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!superuser())
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changeVal = changeVal_orig;
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}
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else
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{
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@ -2919,26 +2933,25 @@ set_config_option(const char *name, const char *value,
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newval, name, conf->min, conf->max)));
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return false;
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}
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/* Limit non-superuser changes */
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if (record->context == PGC_USERLIMIT &&
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source > PGC_S_UNPRIVILEGED &&
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newval > conf->reset_val &&
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!superuser())
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IsUnderPostmaster && !superuser())
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/* No REAL PGC_USERLIMIT */
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{
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ereport(elevel,
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(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
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errmsg("permission denied to set parameter \"%s\"",
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name),
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errhint("Must be superuser to increase this value.")));
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return false;
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/* Limit non-superuser changes */
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if (source > PGC_S_UNPRIVILEGED)
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{
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ereport(elevel,
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(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
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errmsg("permission denied to set parameter \"%s\"",
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name),
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errhint("Must be superuser to increase this value or turn it off.")));
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return false;
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}
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/* Allow change if admin should override */
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if (source < PGC_S_UNPRIVILEGED &&
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record->source > PGC_S_UNPRIVILEGED)
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changeVal = false;
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}
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/* Honor change to config file with SIGHUP */
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if (record->context == PGC_USERLIMIT &&
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source < PGC_S_UNPRIVILEGED &&
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record->reset_source > PGC_S_UNPRIVILEGED &&
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newval < conf->reset_val &&
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!superuser())
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changeVal = changeVal_orig;
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}
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else
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{
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@ -3009,34 +3022,38 @@ set_config_option(const char *name, const char *value,
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}
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if (record->context == PGC_USERLIMIT &&
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*conf->variable)
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IsUnderPostmaster && !superuser())
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{
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int old_int_value,
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new_int_value;
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/* all USERLIMIT strings are message levels */
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assign_msglvl(&old_int_value, conf->reset_val,
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true, source);
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assign_msglvl(&new_int_value, newval,
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true, source);
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/* Limit non-superuser changes */
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if (source > PGC_S_UNPRIVILEGED &&
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new_int_value > old_int_value &&
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!superuser())
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assign_msglvl(&old_int_value, conf->reset_val,
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true, source);
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if (new_int_value > old_int_value)
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{
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ereport(elevel,
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(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
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/* Limit non-superuser changes */
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if (source > PGC_S_UNPRIVILEGED)
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{
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ereport(elevel,
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(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
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errmsg("permission denied to set parameter \"%s\"",
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name),
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errhint("Must be superuser to increase this value.")));
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return false;
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errhint("Must be superuser to increase this value.")));
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return false;
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}
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}
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/* Allow change if admin should override */
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assign_msglvl(&old_int_value, *conf->variable,
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true, source);
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if (new_int_value < old_int_value)
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{
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if (source < PGC_S_UNPRIVILEGED &&
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record->source > PGC_S_UNPRIVILEGED)
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changeVal = changeValOrig;
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}
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/* Honor change to config file with SIGHUP */
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if (source < PGC_S_UNPRIVILEGED &&
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record->reset_source > PGC_S_UNPRIVILEGED &&
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newval < conf->reset_val &&
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!superuser())
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changeVal = changeVal_orig;
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}
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}
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else if (conf->reset_val)
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