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Overview
Comment:Prevent OSSFuzz from using debugging pragmas that are disabled in default builds and which generate lots of excess output.
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SHA3-256:cdc6494c050d821908087e6fd9b1e44ba92d81f363494a80b54647f19e5675f7
User & Date: drh 2017-07-31 17:06:34
Context
2017-07-31
17:51
Fix a windows-compatibility issue in the recently added schema6.test script. check-in: 14e6c302 user: drh tags: trunk
17:06
Prevent OSSFuzz from using debugging pragmas that are disabled in default builds and which generate lots of excess output. check-in: cdc6494c user: drh tags: trunk
16:42
Move the generation of output column names earlier, to right after name resolution and before query transformations such as flattening. This prevents the names from getting mangled by query transformations, and obviates hacks in the query flattener that attempt to work around the name mangling. The resulting code is smaller and faster and gives more consistent output. Fix to ticket [de3403bf5ae5f72ed]. check-in: ade7ddf1 user: drh tags: trunk
Changes
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Changes to test/ossfuzz.c.

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  int rc = iNow>=p->iCutoffTime;
  sqlite3_int64 iDiff = iNow - p->iLastCb;
  if( iDiff > p->mxInterval ) p->mxInterval = iDiff;
  p->nCb++;
  return rc;
}
#endif























/*
** Callback for sqlite3_exec().
*/
static int exec_handler(void *pCnt, int argc, char **argv, char **namev){
  int i;
  if( argv ){
................................................................................

  /* Set a limit on the maximum size of a prepared statement */
  sqlite3_limit(cx.db, SQLITE_LIMIT_VDBE_OP, 25000);

  /* Bit 1 of the selector enables foreign key constraints */
  sqlite3_db_config(cx.db, SQLITE_DBCONFIG_ENABLE_FKEY, uSelector&1, &rc);
  uSelector >>= 1;




  /* Remaining bits of the selector determine a limit on the number of
  ** output rows */
  execCnt = uSelector + 1;

  /* Run the SQL.  The sqlite_exec() interface expects a zero-terminated
  ** string, so make a copy. */







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  int rc = iNow>=p->iCutoffTime;
  sqlite3_int64 iDiff = iNow - p->iLastCb;
  if( iDiff > p->mxInterval ) p->mxInterval = iDiff;
  p->nCb++;
  return rc;
}
#endif

/*
** Disallow debugging pragmas such as "PRAGMA vdbe_debug" and
** "PRAGMA parser_trace" since they can dramatically increase the
** amount of output without actually testing anything useful.
*/
static int block_debug_pragmas(
  void *Notused,
  int eCode,
  const char *zArg1,
  const char *zArg2,
  const char *zArg3,
  const char *zArg4
){
  if( eCode==SQLITE_PRAGMA
   && (sqlite3_strnicmp("vdbe_", zArg1, 5)==0
        || sqlite3_stricmp("parser_trace", zArg1)==0)
  ){
    return SQLITE_DENY;
  }
  return SQLITE_OK;
}

/*
** Callback for sqlite3_exec().
*/
static int exec_handler(void *pCnt, int argc, char **argv, char **namev){
  int i;
  if( argv ){
................................................................................

  /* Set a limit on the maximum size of a prepared statement */
  sqlite3_limit(cx.db, SQLITE_LIMIT_VDBE_OP, 25000);

  /* Bit 1 of the selector enables foreign key constraints */
  sqlite3_db_config(cx.db, SQLITE_DBCONFIG_ENABLE_FKEY, uSelector&1, &rc);
  uSelector >>= 1;

  /* Do not allow debugging pragma statements that might cause excess output */
  sqlite3_set_authorizer(cx.db, block_debug_pragmas, 0);

  /* Remaining bits of the selector determine a limit on the number of
  ** output rows */
  execCnt = uSelector + 1;

  /* Run the SQL.  The sqlite_exec() interface expects a zero-terminated
  ** string, so make a copy. */