ZhangZhuoSJTU
commented
3 years ago More information. When I compiled the google fuzzer test suite, I add the following code to make a libfuzzer-based program into a normal program.
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
extern "C" {
int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size);
__attribute__((weak)) int LLVMFuzzerInitialize(int *argc, char ***argv);
}
int main(int argc, char** argv)
{
if(argc <= 1)
{
exit(1);
printf("argc error!\n");
}
size_t length, result;
unsigned char* buf;
FILE *fp = fopen(argv[1], "rb");
if(fp == NULL)
{
exit(1);
printf("Open error!\n");
}
fseek(fp, 0, SEEK_END);
length = (size_t)ftell(fp);
rewind(fp);
buf = (unsigned char*)malloc(length);
if(buf == NULL)
{
printf("malloc error!\n");
exit(2);
}
result = fread(buf, 1, length, fp);
if(result != length)
{
printf("read error!\n");
exit(3);
}
LLVMFuzzerTestOneInput(buf, result);
free(buf);
fclose(fp);
return 0;
}
junghee
aeflores
eschulte
Hi, I have got some binaries which is failed to be recompiled.
My ddisasm is apt-installed on Ubuntu 18.04, and the version information is:
Generally speaking, there are two types of errors.
1. The conflicts between the following code blocks could not be resolved
These errors occurs in boringssl, openssl-1.0.1f, and openssl-1.1.0c.
Taking boringssl as an example:
I have done some exploration. It seems all these three binaries contain inlined data (e.g., some crypto stuff contained by hand-written assembly). And I found those conflicting addresses are actually the interleaving data, which may indicates ddisasm somehow misclassified data as code.
2. Segment fault for the recompiled binary
There are other three binaries, including lcms, libxml2, and wpantund.
Taking libxml2 as an example
More
I have attached all the six binaries. In each subdirectory, there is a
cmd_line.txtfile describing the problem.I really want to provide the non-stripped version of these binaries, but it seems that they got lost somehow. I do apologize for the inconvenience. All of them come from Google FTS compiled with -O2.
Please let me know if there is anything I can help with. Thanks!