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/*
** Copyright (c) 2019 D. Richard Hipp
**
** This program is free software; you can redistribute it and/or
** modify it under the terms of the Simplified BSD License (also
** known as the "2-Clause License" or "FreeBSD License".)
*
** This program is distributed in the hope that it will be useful,
** but without any warranty; without even the implied warranty of
** merchantability or fitness for a particular purpose.
**
** Author contact information:
** drh@hwaci.com
** http://www.hwaci.com/drh/
**
*******************************************************************************
**
** This file contains code to connect Fossil to libFuzzer. Do a web search
** for "libfuzzer" for details about that fuzzing platform.
**
** To build on linux (the only platform for which this works at
** present) first do
**
** ./configure
**
** Then edit the Makefile as follows:
**
** (1) Change CC to be "clang-6.0" or some other compiler that
** supports libFuzzer
**
** (2) Change APPNAME to "fossil-fuzz"
**
** (3) Add "-fsanitize=fuzzer" and "-DFOSSIL_FUZZ" to TCCFLAGS. Perhaps
** make the first change "-fsanitize=fuzzer,undefined,address" for
** extra, but slower, testing.
**
** Then build the fuzzer using:
**
** make clean fossil-fuzz
**
** To run the fuzzer, create a working directory ("cases"):
**
** mkdir cases
**
** Then seed the working directory with example input files. For example,
** if fuzzing the wiki formatter, perhaps copy *.wiki into cases. Then
** run the fuzzer thusly:
**
** fossil-fuzz cases
**
** The default is to fuzz the Fossil-wiki translator. Use the --fuzztype TYPE
** option to fuzz different aspects of the system.
*/
#include "config.h"
#include "fuzz.h"
#if LOCAL_INTERFACE
/*
** Type of fuzzing:
*/
#define FUZZ_WIKI 0 /* The Fossil-Wiki formatter */
#define FUZZ_MARKDOWN 1 /* The Markdown formatter */
#define FUZZ_ARTIFACT 2 /* Fuzz the artifact parser */
#define FUZZ_WIKI2 3 /* FOSSIL_WIKI and FOSSIL_MARKDOWN */
#define FUZZ_COMFORMAT 4 /* comment_print() */
#endif
/* The type of fuzzing to do */
static int eFuzzType = FUZZ_WIKI;
/* The fuzzer invokes this routine once for each fuzzer input
*/
int LLVMFuzzerTestOneInput(const uint8_t *aData, size_t nByte){
Blob in, out;
blob_init(&in, 0, 0);
blob_append(&in, (char*)aData, (int)nByte);
blob_zero(&out);
switch( eFuzzType ){
case FUZZ_WIKI: {
wiki_convert(&in, &out, 0);
blob_reset(&out);
break;
}
case FUZZ_MARKDOWN: {
Blob title = BLOB_INITIALIZER;
blob_reset(&out);
markdown_to_html(&in, &title, &out);
blob_reset(&title);
break;
}
case FUZZ_WIKI2: {
Blob title = BLOB_INITIALIZER;
wiki_convert(&in, &out, 0);
blob_reset(&out);
markdown_to_html(&in, &title, &out);
blob_reset(&title);
break;
}
case FUZZ_ARTIFACT: {
fossil_fatal("FUZZ_ARTIFACT is not implemented.");
break;
}
case FUZZ_COMFORMAT: {
if( nByte>=3 && aData[1]!=0 && memchr(&aData[1], 0, nByte-1)!=0 ){
int flags = (int)aData[0];
comment_print((const char*)&aData[1],0,15,80,flags);
}
}
}
blob_reset(&in);
blob_reset(&out);
return 0;
}
/*
** Check fuzzer command-line options.
*/
static void fuzzer_options(void){
const char *zType;
db_find_and_open_repository(OPEN_OK_NOT_FOUND|OPEN_SUBSTITUTE,0);
db_multi_exec("PRAGMA query_only=1;");
zType = find_option("fuzztype",0,1);
if( zType==0 || fossil_strcmp(zType,"wiki")==0 ){
eFuzzType = FUZZ_WIKI;
}else if( fossil_strcmp(zType,"markdown")==0 ){
eFuzzType = FUZZ_MARKDOWN;
}else if( fossil_strcmp(zType,"wiki2")==0 ){
eFuzzType = FUZZ_WIKI2;
}else if( fossil_strcmp(zType,"comformat")==0 ){
eFuzzType = FUZZ_COMFORMAT;
}else{
fossil_fatal("unknown fuzz type: \"%s\"", zType);
}
}
/* Libfuzzer invokes this routine once prior to start-up to
** process command-line options.
*/
int LLVMFuzzerInitialize(int *pArgc, char ***pArgv){
expand_args_option(*pArgc, *pArgv);
fuzzer_options();
*pArgc = g.argc;
*pArgv = g.argv;
return 0;
}
/*
** COMMAND: test-fuzz
**
** Usage: %fossil test-fuzz [-fuzztype TYPE] INPUTFILE...
**
** Run a fuzz test using INPUTFILE as the test data. TYPE can be one of:
**
** comformat Fuzz the comment_print() routine
** wiki Fuzz the Fossil-wiki translator
** markdown Fuzz the markdown translator
** artifact Fuzz the artifact parser
** wiki2 Fuzz the Fossil-wiki and markdown translator
*/
void fuzz_command(void){
Blob in;
int i;
fuzzer_options();
verify_all_options();
for(i=2; i<g.argc; i++){
blob_read_from_file(&in, g.argv[i], ExtFILE);
LLVMFuzzerTestOneInput((const uint8_t*)in.aData, (size_t)in.nUsed);
fossil_print("%s\n", g.argv[i]);
blob_reset(&in);
}
}
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