Re: pgsql: Apply RLS policies to partitioned tables.

On 06/11/2017 05:35 PM, Tom Lane wrote:
> Joe Conway <mail(at)joeconway(dot)com> writes:
>> Apply RLS policies to partitioned tables.
>
> Buildfarm member skink has grown a "make check" failure with this commit.
>
> ==28150== VALGRINDERROR-BEGIN
> ==28150== Invalid read of size 8
> ==28150== at 0x39A355: ExecInitModifyTable (nodeModifyTable.c:1862)
> ==28150== by 0x37F0F8: ExecInitNode (execProcnode.c:168)
> ==28150== by 0x37C219: InitPlan (execMain.c:1044)
> ==28150== by 0x37C3AF: standard_ExecutorStart (execMain.c:256)
> ==28150== by 0x37C4B8: ExecutorStart (execMain.c:151)
> ==28150== by 0x4CCCCE: ProcessQuery (pquery.c:157)
> ==28150== by 0x4CCEDF: PortalRunMulti (pquery.c:1287)
> ==28150== by 0x4CDE19: PortalRun (pquery.c:800)
> ==28150== by 0x4C9E85: exec_simple_query (postgres.c:1099)
> ==28150== by 0x4CBF20: PostgresMain (postgres.c:4087)
> ==28150== by 0x44DC04: BackendRun (postmaster.c:4331)
> ==28150== by 0x44FD9B: BackendStartup (postmaster.c:4003)
> ==28150== Address 0xbbdbec8 is 8,008 bytes inside a recently re-allocated block of size 8,192 alloc'd
> ==28150== at 0x4C2AB76: malloc (vg_replace_malloc.c:299)
> ==28150== by 0x6002D2: AllocSetAlloc (aset.c:760)
> ==28150== by 0x606EB5: MemoryContextAllocZeroAligned (mcxt.c:791)
> ==28150== by 0x3832B1: CreateExecutorState (execUtils.c:99)
> ==28150== by 0x37C2E6: standard_ExecutorStart (execMain.c:186)
> ==28150== by 0x37C4B8: ExecutorStart (execMain.c:151)
> ==28150== by 0x4CCCCE: ProcessQuery (pquery.c:157)
> ==28150== by 0x4CCEDF: PortalRunMulti (pquery.c:1287)
> ==28150== by 0x4CDE19: PortalRun (pquery.c:800)
> ==28150== by 0x4C9E85: exec_simple_query (postgres.c:1099)
> ==28150== by 0x4CBF20: PostgresMain (postgres.c:4087)
> ==28150== by 0x44DC04: BackendRun (postmaster.c:4331)
> ==28150==
> ==28150== VALGRINDERROR-END
>
> The cited line is the ExecInitQual call here:
>
> /* varno = node->nominalRelation */
> mapped_wcoList = map_partition_varattnos(wcoList,
> node->nominalRelation,
> partrel, rel);
> foreach(ll, mapped_wcoList)
> {
> WithCheckOption *wco = (WithCheckOption *) lfirst(ll);
> ExprState *wcoExpr = ExecInitQual((List *) wco->qual,
> mtstate->mt_plans[i]);
>
> wcoExprs = lappend(wcoExprs, wcoExpr);
> }
>
> First guess is that map_partition_varattnos has forgotten to handle
> WithCheckOption.qual. If so, though, and if that's not resulting
> in visible misbehavior in the regression tests, then we are missing
> a case that the regression tests should be covering.
>
> BTW, it might be advisable to use castNode(WithCheckOption, ...)
> in the line before that.

Drat. I'll take a look, but it would probably be good if someone
generally familiar with the partitioned tables patches have a look as well.

Joe

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