/*
** 2018-10-26
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
**
** This program is designed for fuzz-testing SQLite database files using
** the -fsanitize=fuzzer option of clang.
**
** The -fsanitize=fuzzer option causes a main() to be inserted automatically.
** That main() invokes LLVMFuzzerTestOneInput(D,S) to be invoked repeatedly.
** Each D is a fuzzed database file. The code in this file runs various
** SQL statements against that database, trying to provoke a failure.
**
** For best results the seed database files should have these tables:
**
** Table "t1" with columns "a" and "b"
** Tables "t2" and "t3 with the same number of compatible columns
** "t3" should have a column names "x"
** Table "t4" with a column "x" that is compatible with t3.x.
**
** Any of these tables can be virtual tables, for example FTS or RTree tables.
**
** To run this test:
**
** mkdir dir
** cp dbfuzz2-seed*.db dir
** clang-6.0 -I. -g -O1 -fsanitize=fuzzer \
** -DTHREADSAFE=0 -DSQLITE_ENABLE_DESERIALIZE \
** -DSQLITE_ENABLE_DBSTAT_VTAB dbfuzz2.c sqlite3.c -ldl
** ./a.out dir
*/
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <ctype.h>
#include <stdint.h>
#ifndef _WIN32
#include <sys/time.h>
#include <sys/resource.h>
#endif
#include "sqlite3.h"
/*
** 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;
/* True to activate PRAGMA vdbe_debug=on */
static int bVdbeDebug = 0;
/* Maximum size of the in-memory database file */
static sqlite3_int64 szMax = 104857600;
/* Progress handler callback data */
static int nCb = 0; /* Number of callbacks seen so far */
static int mxCb = 250000; /* Maximum allowed callbacks */
/***** Copy/paste from ext/misc/memtrace.c ***************************/
/* The original memory allocation routines */
static sqlite3_mem_methods memtraceBase;
static FILE *memtraceOut;
/* Methods that trace memory allocations */
static void *memtraceMalloc(int n){
if( memtraceOut ){
fprintf(memtraceOut, "MEMTRACE: allocate %d bytes\n",
memtraceBase.xRoundup(n));
}
return memtraceBase.xMalloc(n);
}
static void memtraceFree(void *p){
if( p==0 ) return;
if( memtraceOut ){
fprintf(memtraceOut, "MEMTRACE: free %d bytes\n", memtraceBase.xSize(p));
}
memtraceBase.xFree(p);
}
static void *memtraceRealloc(void *p, int n){
if( p==0 ) return memtraceMalloc(n);
if( n==0 ){
memtraceFree(p);
return 0;
}
if( memtraceOut ){
fprintf(memtraceOut, "MEMTRACE: resize %d -> %d bytes\n",
memtraceBase.xSize(p), memtraceBase.xRoundup(n));
}
return memtraceBase.xRealloc(p, n);
}
static int memtraceSize(void *p){
return memtraceBase.xSize(p);
}
static int memtraceRoundup(int n){
return memtraceBase.xRoundup(n);
}
static int memtraceInit(void *p){
return memtraceBase.xInit(p);
}
static void memtraceShutdown(void *p){
memtraceBase.xShutdown(p);
}
/* The substitute memory allocator */
static sqlite3_mem_methods ersaztMethods = {
memtraceMalloc,
memtraceFree,
memtraceRealloc,
memtraceSize,
memtraceRoundup,
memtraceInit,
memtraceShutdown
};
/* Begin tracing memory allocations to out. */
int sqlite3MemTraceActivate(FILE *out){
int rc = SQLITE_OK;
if( memtraceBase.xMalloc==0 ){
rc = sqlite3_config(SQLITE_CONFIG_GETMALLOC, &memtraceBase);
if( rc==SQLITE_OK ){
rc = sqlite3_config(SQLITE_CONFIG_MALLOC, &ersaztMethods);
}
}
memtraceOut = out;
return rc;
}
/* Deactivate memory tracing */
int sqlite3MemTraceDeactivate(void){
int rc = SQLITE_OK;
if( memtraceBase.xMalloc!=0 ){
rc = sqlite3_config(SQLITE_CONFIG_MALLOC, &memtraceBase);
if( rc==SQLITE_OK ){
memset(&memtraceBase, 0, sizeof(memtraceBase));
}
}
memtraceOut = 0;
return rc;
}
/***** End copy/paste from ext/misc/memtrace.c ***************************/
/*
** Progress handler callback
**
** Count the number of callbacks and cause an abort once the limit is
** reached.
*/
static int progress_handler(void *pNotUsed){
nCb++;
if( nCb<mxCb ) return 0;
if( eVerbosity>=1 ){
printf("-- Progress limit of %d reached\n", mxCb);
}
return 1;
}
/* 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;
sqlite3_int64 x;
char *zErr = 0;
if( eVerbosity>=1 ){
printf("************** nByte=%d ***************\n", (int)nByte);
fflush(stdout);
}
if( sqlite3_initialize() ) return 0;
rc = sqlite3_open(0, &db);
if( rc ) return 1;
a = sqlite3_malloc64(nByte+1);
if( a==0 ) return 1;
memcpy(a, aData, nByte);
sqlite3_deserialize(db, "main", a, nByte, nByte,
SQLITE_DESERIALIZE_RESIZEABLE |
SQLITE_DESERIALIZE_FREEONCLOSE);
x = szMax;
#ifdef SQLITE_FCNTL_SIZE_LIMIT
sqlite3_file_control(db, "main", SQLITE_FCNTL_SIZE_LIMIT, &x);
#endif
if( bVdbeDebug ){
sqlite3_exec(db, "PRAGMA vdbe_debug=ON", 0, 0, 0);
}
if( mxCb>0 ){
sqlite3_progress_handler(db, 10, progress_handler, 0);
}
for(i=0; i<sizeof(azSql)/sizeof(azSql[0]); i++){
if( eVerbosity>=1 ){
printf("%s\n", azSql[i]);
fflush(stdout);
}
zErr = 0;
nCb = 0;
rc = sqlite3_exec(db, azSql[i], 0, 0, &zErr);
if( rc && eVerbosity>=1 ){
printf("-- rc=%d zErr=%s\n", rc, zErr);
}
sqlite3_free(zErr);
}
rc = sqlite3_close(db);
if( rc!=SQLITE_OK ){
fprintf(stdout, "sqlite3_close() returns %d\n", rc);
}
if( sqlite3_memory_used()!=0 ){
int nAlloc = 0;
int nNotUsed = 0;
sqlite3_status(SQLITE_STATUS_MALLOC_COUNT, &nAlloc, &nNotUsed, 0);
fprintf(stderr,"Memory leak: %lld bytes in %d allocations\n",
sqlite3_memory_used(), nAlloc);
exit(1);
}
return 0;
}
/*
** Return the number of "v" characters in a string. Return 0 if there
** are any characters in the string other than "v".
*/
static int numberOfVChar(const char *z){
int N = 0;
while( z[0] && z[0]=='v' ){
z++;
N++;
}
return z[0]==0 ? N : 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, n;
int argc = *pArgc;
char **argv = *pArgv;
for(i=j=1; i<argc; i++){
char *z = argv[i];
if( z[0]=='-' ){
z++;
if( z[0]=='-' ) z++;
if( z[0]=='v' && (n = numberOfVChar(z))>0 ){
eVerbosity += n;
continue;
}
if( strcmp(z,"vdbe-debug")==0 ){
bVdbeDebug = 1;
continue;
}
if( strcmp(z,"limit")==0 ){
if( i+1==argc ){
fprintf(stderr, "missing argument to %s\n", argv[i]);
exit(1);
}
mxCb = strtol(argv[++i], 0, 0);
continue;
}
if( strcmp(z,"memtrace")==0 ){
sqlite3MemTraceActivate(stdout);
continue;
}
if( strcmp(z,"mem")==0 ){
bVdbeDebug = 1;
continue;
}
if( strcmp(z,"max-db-size")==0 ){
if( i+1==argc ){
fprintf(stderr, "missing argument to %s\n", argv[i]);
exit(1);
}
szMax = strtol(argv[++i], 0, 0);
continue;
}
#ifndef _WIN32
if( strcmp(z,"max-stack")==0
|| strcmp(z,"max-data")==0
|| strcmp(z,"max-as")==0
){
struct rlimit x,y;
int resource = RLIMIT_STACK;
char *zType = "RLIMIT_STACK";
if( i+1==argc ){
fprintf(stderr, "missing argument to %s\n", argv[i]);
exit(1);
}
if( z[4]=='d' ){
resource = RLIMIT_DATA;
zType = "RLIMIT_DATA";
}
if( z[4]=='a' ){
resource = RLIMIT_AS;
zType = "RLIMIT_AS";
}
memset(&x,0,sizeof(x));
getrlimit(resource, &x);
y.rlim_cur = atoi(argv[++i]);
y.rlim_max = x.rlim_cur;
setrlimit(resource, &y);
memset(&y,0,sizeof(y));
getrlimit(resource, &y);
printf("%s changed from %d to %d\n",
zType, (int)x.rlim_cur, (int)y.rlim_cur);
continue;
}
#endif /* _WIN32 */
}
argv[j++] = argv[i];
}
argv[j] = 0;
*pArgc = j;
return 0;
}
#ifdef STANDALONE
/*
** Read an entire file into memory. Space to hold the file comes
** from malloc().
*/
static unsigned char *readFile(const char *zName, int *pnByte){
FILE *in = fopen(zName, "rb");
long nIn;
size_t nRead;
unsigned char *pBuf;
if( in==0 ) return 0;
fseek(in, 0, SEEK_END);
nIn = ftell(in);
rewind(in);
pBuf = malloc( nIn+1 );
if( pBuf==0 ){ fclose(in); return 0; }
nRead = fread(pBuf, nIn, 1, in);
fclose(in);
if( nRead!=1 ){
free(pBuf);
return 0;
}
pBuf[nIn] = 0;
if( pnByte ) *pnByte = nIn;
return pBuf;
}
#endif /* STANDALONE */
#ifdef STANDALONE
int main(int argc, char **argv){
int i;
LLVMFuzzerInitialize(&argc, &argv);
for(i=1; i<argc; i++){
unsigned char *pIn;
int nIn;
pIn = readFile(argv[i], &nIn);
if( pIn ){
LLVMFuzzerTestOneInput((const uint8_t*)pIn, (size_t)nIn);
free(pIn);
}
}
if( eVerbosity>0 ){
struct rusage x;
printf("SQLite %s\n", sqlite3_sourceid());
memset(&x, 0, sizeof(x));
if( getrusage(RUSAGE_SELF, &x)==0 ){
printf("Maximum RSS = %ld KB\n", x.ru_maxrss);
}
}
return 0;
}
#endif /*STANDALONE*/