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66709133c7
MapArrayTypeName would copy up to NAMEDATALEN-1 bytes of the base type name, which of course is wrong: after prepending '_' there is only room for NAMEDATALEN-2 bytes. Aside from being the wrong result, this case would lead to overrunning the statically allocated work buffer. This would be a security bug if the function were ever used outside bootstrap mode, but it isn't, at least not in any currently supported branches. Aside from fixing the off-by-one loop logic, this patch gets rid of the static work buffer by having MapArrayTypeName pstrdup its result; the sole caller was already doing that, so this just requires moving the pstrdup call. This saves a few bytes but mainly it makes the API a lot cleaner. Back-patch on the off chance that there is some third-party code using MapArrayTypeName with less-secure input. Pushing pstrdup into the function should not cause any serious problems for such hypothetical code; at worst there might be a short term memory leak. Per Coverity scanning.
148 lines
3.1 KiB
Plaintext
148 lines
3.1 KiB
Plaintext
%{
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/*-------------------------------------------------------------------------
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*
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* bootscanner.l
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* a lexical scanner for the bootstrap parser
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*
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* Portions Copyright (c) 1996-2014, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* src/backend/bootstrap/bootscanner.l
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "access/attnum.h"
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#include "access/htup.h"
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#include "access/itup.h"
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#include "access/skey.h"
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#include "access/tupdesc.h"
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#include "bootstrap/bootstrap.h"
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#include "catalog/pg_am.h"
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#include "catalog/pg_attribute.h"
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#include "catalog/pg_class.h"
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#include "nodes/nodes.h"
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#include "nodes/parsenodes.h"
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#include "nodes/pg_list.h"
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#include "nodes/primnodes.h"
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#include "parser/scansup.h"
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#include "rewrite/prs2lock.h"
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#include "storage/block.h"
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#include "storage/fd.h"
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#include "storage/itemptr.h"
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#include "storage/off.h"
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#include "utils/rel.h"
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/* Not needed now that this file is compiled as part of bootparse. */
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/* #include "bootparse.h" */
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/* Avoid exit() on fatal scanner errors (a bit ugly -- see yy_fatal_error) */
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#undef fprintf
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#define fprintf(file, fmt, msg) fprintf_to_ereport(fmt, msg)
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static void
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fprintf_to_ereport(const char *fmt, const char *msg)
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{
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ereport(ERROR, (errmsg_internal("%s", msg)));
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}
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static int yyline = 1; /* line number for error reporting */
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%}
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%option 8bit
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%option never-interactive
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%option nodefault
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%option noinput
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%option nounput
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%option noyywrap
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%option warn
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%option prefix="boot_yy"
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D [0-9]
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oct \\{D}{D}{D}
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Exp [Ee][-+]?{D}+
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id ([A-Za-z0-9_]|{oct}|\-)+
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sid \"([^\"])*\"
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arrayid [A-Za-z0-9_]+\[{D}*\]
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%%
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open { return(OPEN); }
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close { return(XCLOSE); }
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create { return(XCREATE); }
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OID { return(OBJ_ID); }
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bootstrap { return(XBOOTSTRAP); }
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"shared_relation" { return(XSHARED_RELATION); }
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"without_oids" { return(XWITHOUT_OIDS); }
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"rowtype_oid" { return(XROWTYPE_OID); }
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_null_ { return(NULLVAL); }
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insert { return(INSERT_TUPLE); }
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"," { return(COMMA); }
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"=" { return(EQUALS); }
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"(" { return(LPAREN); }
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")" { return(RPAREN); }
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[\n] { yyline++; }
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[\t] ;
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" " ;
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^\#[^\n]* ; /* drop everything after "#" for comments */
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"declare" { return(XDECLARE); }
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"build" { return(XBUILD); }
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"indices" { return(INDICES); }
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"unique" { return(UNIQUE); }
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"index" { return(INDEX); }
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"on" { return(ON); }
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"using" { return(USING); }
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"toast" { return(XTOAST); }
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{arrayid} {
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yylval.str = MapArrayTypeName(yytext);
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return(ID);
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}
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{id} {
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yylval.str = scanstr(yytext);
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return(ID);
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}
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{sid} {
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yytext[strlen(yytext)-1] = '\0'; /* strip off quotes */
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yylval.str = scanstr(yytext+1);
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yytext[strlen(yytext)] = '"'; /* restore quotes */
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return(ID);
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}
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(-)?{D}+"."{D}*({Exp})? |
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(-)?{D}*"."{D}+({Exp})? |
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(-)?{D}+{Exp} {
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yylval.str = pstrdup(yytext);
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return(CONST_P);
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}
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. {
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elog(ERROR, "syntax error at line %d: unexpected character \"%s\"", yyline, yytext);
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}
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%%
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void
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yyerror(const char *message)
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{
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elog(ERROR, "%s at line %d", message, yyline);
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}
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