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Implemented --patterndatamask support for use with patterntype sha256. Initialize the found variables in locate_pattern() to zero.

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yellows8 2015-06-10 15:02:01 -04:00
parent 58d3e359c4
commit c3bd060beb
1 changed files with 33 additions and 3 deletions
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34
ropgadget_patternfinder.c
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@ -277,11 +277,24 @@ int locate_pattern()
{
int ret=0;
size_t pos, i;
unsigned int found, found2;
unsigned int found=0, found2=0;
unsigned int tmpval, tmpval2;
unsigned char *tmpbuf = NULL;
unsigned char calchash[0x20];
if(patterntype==0 && patternmask)
{
tmpbuf = malloc(hashblocksize);
if(tmpbuf==NULL)
{
printf("Failed to alloc tmpbuf in locate_pattern().\n");
return 8;
}
memset(tmpbuf, 0, hashblocksize);
}
for(pos=0; pos<filebufsz; pos+=stride)
{
tmpval = 0;
@ -290,7 +303,22 @@ int locate_pattern()
{
if(filebufsz - pos < hashblocksize)break;
if(patternmask==NULL)
{
SHA256(&filebuf[pos], hashblocksize, calchash);
}
else
{
memcpy(tmpbuf, &filebuf[pos], hashblocksize);
for(i=0; i<hashblocksize; i++)
{
if(i<patternmask_size)tmpbuf[i] &= patternmask[i];
}
SHA256(tmpbuf, hashblocksize, calchash);
}
if(memcmp(patterndata, calchash, 0x20)==0)
{
tmpval = 1;
@ -371,6 +399,8 @@ int locate_pattern()
if(!plainout)printf("Found 0x%x matches.\n", found);
}
if(patterntype==0 && patternmask)free(tmpbuf);
return ret;
}
@ -498,7 +528,7 @@ int main(int argc, char **argv)
printf("Options:\n");
printf("--patterntype=<type> Selects the pattern-type, which must be one of the following(this option is required): sha256 or datacmp. sha256: Hash every --patternsha256size bytes in the binary, for locating the target pattern. The input bindata(sha256 hash) size must be 0x20-bytes.\n");
printf("--patterndata=<bindata> Pattern data to use during searching the binary, see --patterntype.\n");
printf("--patterndatamask=<bindata> Mask data to use with pattern-type datacmp. The byte-size can be less than the size of patterndata as well. The data loaded from the filebuf is &= with this mask data.\n");
printf("--patterndatamask=<bindata> Mask data to use with the data loaded from the file. The byte-size can be less than the size of patterndata / patternsha256size as well. The data loaded from the filebuf is &= with this mask data.\n");
printf("--patternsha256size=0x<hexval> See --patterntype.\n");
printf("--stride=0x<hexval> In the search loop, this is the value that the pos is increased by at the end of each interation. By default this is 0x4.\n");
printf("--findtarget=0x<hexval> Stop searching once this number of matches were found, by default this is 0x1. When this is 0x0, this will not stop until the end of the binary is reached.\n");