2 * YAFFS: Yet another FFS. A NAND-flash specific file system.
4 * Copyright (C) 2002-2018 Aleph One Ltd.
6 * Created by Charles Manning <charles@aleph1.co.uk>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
14 * Fuzzer to fuzz a file
23 #include <sys/types.h>
26 int main(int argc, char *argv[])
31 int changesPerBuffer = 0;
34 unsigned char buffer[1000000];
40 while((c = getopt(argc,argv,"p:")) != -1){
48 printf("-p value less than 100 is invalid\n");
53 printf(" Needs a file name to fuzz\n");
57 h = open(argv[optind], O_RDWR);
58 flen = lseek(h,0,SEEK_END);
61 printf(" File is too short\n");
65 nbuffers = (flen + sizeof(buffer) - 1) / sizeof(buffer);
67 changesPerBuffer = 1+ (sizeof(buffer) * 8) / prob;
69 printf("Fuzzing file %s. Size %d, probablity 1/%d, changing %d bits in each of %d buffers\n",
70 argv[optind],flen,prob,changesPerBuffer,nbuffers);
74 for(b = 0; b < nbuffers; b++){
75 /* printf("buffer %d\n",b); */
76 lseek(h,b * sizeof(buffer),SEEK_SET);
77 bufsize = read(h,buffer,sizeof(buffer));
78 for(i = 0; i < changesPerBuffer; i++){
79 x = rand() % (sizeof(buffer) * 8);
80 buffer[x >> 3] ^= (1 << (x & 7));
82 lseek(h,b * sizeof(buffer),SEEK_SET);
83 write(h,buffer,bufsize);