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Workaround for perl problem where evaluating UTF8 regexes can cause

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implicit loading of modules, thereby breaking Safe rules.
We compile and call a tiny perl function on trusted interpreter init, after which
the problem does not occur.
This commit is contained in:
Andrew Dunstan
2007-12-01 15:39:49 +00:00
parent f575dfc230
commit 63276b7f6c
1 changed files with 49 additions and 1 deletions
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50
src/pl/plperl/plperl.c
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@@ -33,7 +33,7 @@
* ENHANCEMENTS, OR MODIFICATIONS.
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/pl/plperl/plperl.c,v 1.94.2.7 2007/11/22 17:47:40 tgl Exp $
* $PostgreSQL: pgsql/src/pl/plperl/plperl.c,v 1.94.2.8 2007/12/01 15:39:49 adunstan Exp $
*
**********************************************************************/
@@ -150,6 +150,8 @@ static plperl_proc_desc *compile_plperl_function(Oid fn_oid, bool is_trigger);
static SV *plperl_hash_from_tuple(HeapTuple tuple, TupleDesc tupdesc);
static void plperl_init_shared_libs(pTHX);
static HV *plperl_spi_execute_fetch_result(SPITupleTable *, int, int);
static SV *plperl_create_sub(char *s, bool trusted);
static SV *plperl_call_perl_func(plperl_proc_desc *desc, FunctionCallInfo fcinfo);
/*
* This routine is a crock, and so is everyplace that calls it. The problem
@@ -396,6 +398,52 @@ plperl_safe_init(void)
else
{
eval_pv(SAFE_OK, FALSE);
if (GetDatabaseEncoding() == PG_UTF8)
{
/*
* Fill in just enough information to set up this perl
* function in the safe container and call it.
* For some reason not entirely clear, it prevents errors that
* can arise from the regex code later trying to load
* utf8 modules.
*/
plperl_proc_desc desc;
FunctionCallInfoData fcinfo;
FmgrInfo outfunc;
HeapTuple typeTup;
Form_pg_type typeStruct;
SV *ret;
SV *func;
/* make sure we don't call ourselves recursively */
plperl_safe_init_done = true;
/* compile the function */
func = plperl_create_sub(
"return shift =~ /\\xa9/i ? 'true' : 'false' ;",
true);
/* set up to call the function with a single text argument 'a' */
desc.reference = func;
desc.nargs = 1;
desc.arg_is_rowtype[0] = false;
fcinfo.argnull[0] = false;
fcinfo.arg[0] =
DatumGetTextP(DirectFunctionCall1(textin,
CStringGetDatum("a")));
typeTup = SearchSysCache(TYPEOID,
TEXTOID,
0, 0, 0);
typeStruct = (Form_pg_type) GETSTRUCT(typeTup);
fmgr_info(typeStruct->typoutput,&(desc.arg_out_func[0]));
ReleaseSysCache(typeTup);
/* and make the call */
ret = plperl_call_perl_func(&desc,&fcinfo);
}
}
plperl_safe_init_done = true;