140 lines
4.0 KiB
C
140 lines
4.0 KiB
C
/*
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** 2018-10-26
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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*************************************************************************
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**
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** This program is designed for fuzz-testing SQLite database files using
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** the -fsanitize=fuzzer option of clang.
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**
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** The -fsanitize=fuzzer option causes a main() to be inserted automatically.
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** That main() invokes LLVMFuzzerTestOneInput(D,S) to be invoked repeatedly.
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** Each D is a fuzzed database file. The code in this file runs various
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** SQL statements against that database, trying to provoke a failure.
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**
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** For best results the seed database files should have these tables:
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**
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** Table "t1" with columns "a" and "b"
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** Tables "t2" and "t3 with the same number of compatible columns
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** "t3" should have a column names "x"
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** Table "t4" with a column "x" that is compatible with t3.x.
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**
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** Any of these tables can be virtual tables, for example FTS or RTree tables.
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**
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** To run this test:
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**
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** mkdir dir
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** cp dbfuzz2-seed*.db dir
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** clang-6.0 -I. -g -O1 -fsanitize=fuzzer \
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** -DTHREADSAFE=0 -DSQLITE_ENABLE_DESERIALIZE \
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** -DSQLITE_ENABLE_DBSTAT_VTAB dbfuzz2.c sqlite3.c -ldl
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** ./a.out dir
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*/
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdarg.h>
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#include <ctype.h>
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#include <stdint.h>
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#include "sqlite3.h"
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/*
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** This is the is the SQL that is run against the database.
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*/
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static const char *azSql[] = {
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"PRAGMA integrity_check;",
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"SELECT * FROM sqlite_master;",
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"SELECT sum(length(name)) FROM dbstat;",
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"UPDATE t1 SET b=a, a=b WHERE a<b;",
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"ALTER TABLE t1 RENAME TO alkjalkjdfiiiwuer987lkjwer82mx97sf98788s9789s;",
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"INSERT INTO t3 SELECT * FROM t2;",
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"DELETE FROM t3 WHERE x IN (SELECT x FROM t4);",
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"REINDEX;",
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"DROP TABLE t3;",
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"VACUUM;",
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};
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/* Output verbosity level. 0 means complete silence */
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int eVerbosity = 0;
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/* libFuzzer invokes this routine with fuzzed database files (in aData).
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** This routine run SQLite against the malformed database to see if it
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** can provoke a failure or malfunction.
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*/
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int LLVMFuzzerTestOneInput(const uint8_t *aData, size_t nByte){
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unsigned char *a;
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sqlite3 *db;
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int rc;
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int i;
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if( eVerbosity>=1 ){
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printf("************** nByte=%d ***************\n", (int)nByte);
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fflush(stdout);
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}
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if( sqlite3_initialize() ) return 0;
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rc = sqlite3_open(0, &db);
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if( rc ) return 1;
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a = sqlite3_malloc64(nByte+1);
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if( a==0 ) return 1;
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memcpy(a, aData, nByte);
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sqlite3_deserialize(db, "main", a, nByte, nByte,
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SQLITE_DESERIALIZE_RESIZEABLE |
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SQLITE_DESERIALIZE_FREEONCLOSE);
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for(i=0; i<sizeof(azSql)/sizeof(azSql[0]); i++){
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if( eVerbosity>=1 ){
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printf("%s\n", azSql[i]);
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fflush(stdout);
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}
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sqlite3_exec(db, azSql[i], 0, 0, 0);
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}
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rc = sqlite3_close(db);
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if( rc!=SQLITE_OK ){
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fprintf(stdout, "sqlite3_close() returns %d\n", rc);
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}
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if( sqlite3_memory_used()!=0 ){
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int nAlloc = 0;
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int nNotUsed = 0;
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sqlite3_status(SQLITE_STATUS_MALLOC_COUNT, &nAlloc, &nNotUsed, 0);
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fprintf(stderr,"Memory leak: %lld bytes in %d allocations\n",
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sqlite3_memory_used(), nAlloc);
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exit(1);
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}
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return 0;
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}
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/* libFuzzer invokes this routine once when the executable starts, to
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** process the command-line arguments.
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*/
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int LLVMFuzzerInitialize(int *pArgc, char ***pArgv){
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int i, j;
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int argc = *pArgc;
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char **newArgv;
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char **argv = *pArgv;
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newArgv = malloc( sizeof(char*)*(argc+1) );
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if( newArgv==0 ) return 0;
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newArgv[0] = argv[0];
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for(i=j=1; i<argc; i++){
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char *z = argv[i];
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if( z[0]=='-' ){
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z++;
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if( z[0]=='-' ) z++;
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if( strcmp(z,"v")==0 ){
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eVerbosity++;
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continue;
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}
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}
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newArgv[j++] = argv[i];
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}
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newArgv[j] = 0;
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*pArgv = newArgv;
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*pArgc = j;
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return 0;
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}
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