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Repair rule permissions-checking bug reported by Tim Burgess 10-Feb-02:

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the table(s) modified by the original query would get checked for the
type of write permission needed by a rule query.
This commit is contained in:
Tom Lane 2003-02-13 21:39:50 +00:00
parent 18e8f06c9d
commit f4a72f773c
1 changed files with 21 additions and 4 deletions
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25
src/backend/rewrite/rewriteHandler.c
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@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California * Portions Copyright (c) 1994, Regents of the University of California
* *
* IDENTIFICATION * IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/rewrite/rewriteHandler.c,v 1.116 2003/01/17 02:01:16 tgl Exp $ * $Header: /cvsroot/pgsql/src/backend/rewrite/rewriteHandler.c,v 1.117 2003/02/13 21:39:50 tgl Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -62,9 +62,11 @@ rewriteRuleAction(Query *parsetree,
{ {
int current_varno, int current_varno,
new_varno; new_varno;
List *main_rtable;
int rt_length; int rt_length;
Query *sub_action; Query *sub_action;
Query **sub_action_ptr; Query **sub_action_ptr;
List *rt;
/* /*
* Make modifiable copies of rule action and qual (what we're passed * Make modifiable copies of rule action and qual (what we're passed
@ -99,16 +101,31 @@ rewriteRuleAction(Query *parsetree,
* Generate expanded rtable consisting of main parsetree's rtable plus * Generate expanded rtable consisting of main parsetree's rtable plus
* rule action's rtable; this becomes the complete rtable for the rule * rule action's rtable; this becomes the complete rtable for the rule
* action. Some of the entries may be unused after we finish * action. Some of the entries may be unused after we finish
* rewriting, but if we tried to clean those out we'd have a much * rewriting, but if we tried to remove them we'd have a much
* harder job to adjust RT indexes in the query's Vars. It's OK to * harder job to adjust RT indexes in the query's Vars. It's OK to
* have unused RT entries, since planner will ignore them. * have unused RT entries, since planner will ignore them.
* *
* NOTE: because planner will destructively alter rtable, we must ensure * NOTE: because planner will destructively alter rtable, we must ensure
* that rule action's rtable is separate and shares no substructure * that rule action's rtable is separate and shares no substructure
* with the main rtable. Hence do a deep copy here. * with the main rtable. Hence do a deep copy here.
*
* Also, we must disable write-access checking in all the RT entries
* copied from the main query. This is safe since in fact the rule action
* won't write on them, and it's necessary because the rule action may
* have a different commandType than the main query, causing
* ExecCheckRTEPerms() to make an inappropriate check. The read-access
* checks can be left enabled, although they're probably redundant.
*/ */
sub_action->rtable = nconc((List *) copyObject(parsetree->rtable), main_rtable = (List *) copyObject(parsetree->rtable);
sub_action->rtable);
foreach(rt, main_rtable)
{
RangeTblEntry *rte = (RangeTblEntry *) lfirst(rt);
rte->checkForWrite = false;
}
sub_action->rtable = nconc(main_rtable, sub_action->rtable);
/* /*
* Each rule action's jointree should be the main parsetree's jointree * Each rule action's jointree should be the main parsetree's jointree