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SQLite training in Houston TX on 2019-11-05 (details)
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Overview
Comment:Improvements to the dbfuzz2.c test module.
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SHA3-256: d60eff493b875366981c5a25000bb65cde9f6e628192914910790acc562c17b9
User & Date: drh 2018-10-27 21:06:44
Context
2018-10-29
16:07
Harden the dbstat extension against corrupt database files. check-in: a0d47f25 user: drh tags: trunk
2018-10-27
21:06
Improvements to the dbfuzz2.c test module. check-in: d60eff49 user: drh tags: trunk
16:02
Add an entry in Makefile.in to build dbfuzz2 using clang-6.0 with -fsanitize=fuzzer,undefined. check-in: a4a083ed user: drh tags: trunk
Changes
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Changes to Makefile.in.

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  -DSQLITE_DEBUG \
  -DSQLITE_ENABLE_DBSTAT_VTAB \
  -DSQLITE_ENABLE_RTREE \
  -DSQLITE_ENABLE_FTS4 \
  -DSQLITE_EANBLE_FTS5

dbfuzz2:	$(TOP)/test/dbfuzz2.c sqlite3.c sqlite3.h
	clang-6.0 -I. -g -Os -fsanitize=fuzzer,undefined -o dbfuzz2 \
		$(DBFUZZ2_OPTS) $(TOP)/test/dbfuzz2.c sqlite3.c
	mkdir -p dbfuzz2-dir
	cp $(TOP)/test/dbfuzz2-seed* dbfuzz2-dir

mptester$(TEXE):	sqlite3.lo $(TOP)/mptest/mptest.c
	$(LTLINK) -o $@ -I. $(TOP)/mptest/mptest.c sqlite3.lo \
		$(TLIBS) -rpath "$(libdir)"







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  -DSQLITE_DEBUG \
  -DSQLITE_ENABLE_DBSTAT_VTAB \
  -DSQLITE_ENABLE_RTREE \
  -DSQLITE_ENABLE_FTS4 \
  -DSQLITE_EANBLE_FTS5

dbfuzz2:	$(TOP)/test/dbfuzz2.c sqlite3.c sqlite3.h
	clang-6.0 -I. -g -O0 -fsanitize=fuzzer,undefined -o dbfuzz2 \
		$(DBFUZZ2_OPTS) $(TOP)/test/dbfuzz2.c sqlite3.c
	mkdir -p dbfuzz2-dir
	cp $(TOP)/test/dbfuzz2-seed* dbfuzz2-dir

mptester$(TEXE):	sqlite3.lo $(TOP)/mptest/mptest.c
	$(LTLINK) -o $@ -I. $(TOP)/mptest/mptest.c sqlite3.lo \
		$(TLIBS) -rpath "$(libdir)"

Changes to test/dbfuzz2.c.

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** This is the is the SQL that is run against the database.
*/
static const char *azSql[] = {
  "PRAGMA integrity_check;",
  "SELECT * FROM sqlite_master;",
  "SELECT sum(length(name)) FROM dbstat;",
  "UPDATE t1 SET b=a, a=b WHERE a<b;",
  "ALTER TABLE t1 RENAME TO alkjalkjdfiiiwuer987lkjwer82mx97sf98788s9789s;"
  "INSERT INTO t3 SELECT * FROM t2;",
  "DELETE FROM t3 WHERE x IN (SELECT x FROM t4);",
  "REINDEX;"
  "DROP TABLE t3;",
  "VACUUM;",
};








int LLVMFuzzerTestOneInput(const uint8_t *aData, size_t nByte){
  unsigned char *a;
  sqlite3 *db;
  int rc;
  int i;





  rc = sqlite3_open(":memory:", &db);
  if( rc ) return 1;
  a = sqlite3_malloc64(nByte);
  if( a==0 ) return 1;
  memcpy(a, aData, nByte);
  sqlite3_deserialize(db, "main", a, nByte, nByte,
        SQLITE_DESERIALIZE_RESIZEABLE |
        SQLITE_DESERIALIZE_FREEONCLOSE);
  for(i=0; i<sizeof(azSql)/sizeof(azSql[0]); i++){




    sqlite3_exec(db, azSql[i], 0, 0, 0);
  }
  sqlite3_close(db);




  return 0;
}




































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** This is the is the SQL that is run against the database.
*/
static const char *azSql[] = {
  "PRAGMA integrity_check;",
  "SELECT * FROM sqlite_master;",
  "SELECT sum(length(name)) FROM dbstat;",
  "UPDATE t1 SET b=a, a=b WHERE a<b;",
  "ALTER TABLE t1 RENAME TO alkjalkjdfiiiwuer987lkjwer82mx97sf98788s9789s;",
  "INSERT INTO t3 SELECT * FROM t2;",
  "DELETE FROM t3 WHERE x IN (SELECT x FROM t4);",
  "REINDEX;",
  "DROP TABLE t3;",
  "VACUUM;",
};

/* Output verbosity level.  0 means complete silence */
int eVerbosity = 0;

/* libFuzzer invokes this routine with fuzzed database files (in aData).
** This routine run SQLite against the malformed database to see if it
** can provoke a failure or malfunction.
*/
int LLVMFuzzerTestOneInput(const uint8_t *aData, size_t nByte){
  unsigned char *a;
  sqlite3 *db;
  int rc;
  int i;

  if( eVerbosity>=1 ){
    printf("************** nByte=%d ***************\n", (int)nByte);
    fflush(stdout);
  }
  rc = sqlite3_open(":memory:", &db);
  if( rc ) return 1;
  a = sqlite3_malloc64(nByte);
  if( a==0 ) return 1;
  memcpy(a, aData, nByte);
  sqlite3_deserialize(db, "main", a, nByte, nByte,
        SQLITE_DESERIALIZE_RESIZEABLE |
        SQLITE_DESERIALIZE_FREEONCLOSE);
  for(i=0; i<sizeof(azSql)/sizeof(azSql[0]); i++){
    if( eVerbosity>=1 ){
      printf("%s\n", azSql[i]);
      fflush(stdout);
    }
    sqlite3_exec(db, azSql[i], 0, 0, 0);
  }
  sqlite3_close(db);
  if( sqlite3_memory_used()!=0 ){
    fprintf(stderr,"Memory leak: %lld bytes\n", sqlite3_memory_used());
    exit(1);
  }
  return 0;
}

/* libFuzzer invokes this routine once when the executable starts, to
** process the command-line arguments.
*/
int LLVMFuzzerInitialize(int *pArgc, char ***pArgv){
  int i, j;
  int argc = *pArgc;
  char **newArgv;
  char **argv = *pArgv;
  newArgv = malloc( sizeof(char*)*(argc+1) );
  if( newArgv==0 ) return 0;
  newArgv[0] = argv[0];
  for(i=j=1; i<argc; i++){
    char *z = argv[i];
    if( z[0]=='-' ){
      z++;
      if( z[0]=='-' ) z++;
      if( strcmp(z,"v")==0 ){
        eVerbosity++;
        continue;
      }
    }
    newArgv[j++] = argv[i];
  }
  newArgv[j] = 0;
  *pArgv = newArgv;
  *pArgc = j;
  return 0;
}