afl-clang error

[Najeeb Choudhary]

hey all 

i am use first time afl-clang or afl-fuzz... i have counter issue when i am compile

test.c

 #include <stdio.h>

int main(int argc, char** argv) {

    /* Reset state. */

    memset(buf, 0, 100);

    /* Read input data. */

    read(0, buf, 100);

    /* Parse it in some vulnerable way. You'd normally call a library here. */

    if (buf[0] != 'p') puts("error 1"); else

    if (buf[1] != 'w') puts("error 2"); else

    if (buf[2] != 'n') puts("error 3"); else

      abort();

}

program they give i error this

plz sortout what i am doing wrong. and plz give some example for compile with afl-clang or alf-gcc.. i am use ubuntu 16.04

[Florian Weimer]

* Najeeb Choudhary:

> program they give i error this
>

> <https://lh3.googleusercontent.com/-7cg8lTWHGkU/V_D8ERqqwBI/AAAAAAAAAcQ/LL22KDW_8Rk46LIx6etqLV68LmePV-VbgCLcB/s1600/afl4.png>

Text is: “Oops, failed to execute 'clang' - check your PATH”

It seems that clang is not actually installed.

What happens if you enter “clang” in the terminal? (Please post any
error messages as text, thank you.)

[Najeeb Choudhary]

thanks Florian Weimer 

i war not install clang...that's why error show me now it work good.... 

[Najeeb Choudhary]

may i ask one more think.....

i have incounter one more issue when i am test program with gcc afl-fuzz work perfect but

when i compiled with afl-gcc i was see this error am also try this 

$ LIMIT_MB=50

$ ( ulimit -Sv $[LIMIT_MB << 10]; /path/to/tested_binary ... )

[Florian Weimer]

* Najeeb Choudhary:

> *may i ask one more think.....*
>
> *i have incounter one more issue when i am test program with gcc afl-fuzz
> work perfect but*
> *when i compiled with afl-gcc i was see this error am also try this *
> *$ LIMIT_MB=50*
> *$ ( ulimit -Sv $[LIMIT_MB << 10]; /path/to/tested_binary ... )*
>
> <https://lh3.googleusercontent.com/-Vn8g3gD2ljQ/V_FFXrEYPmI/AAAAAAAAAck/B9wxZqUh1FAa0dvRCvzzDs0vC-ztyGF4wCLcB/s1600/afl5.png>

Please post the error messages as text.

[Najeeb Choudhary]

this is error when i compile with afl-clang and fuzz with afl-fuzzer (note: this error not show when code compile with gcc)

najeeb@najeeb:~/Music/ctf/roptuts/test$ ls

in  input  out  test  test.c

najeeb@najeeb:~/Music/ctf/roptuts/test$ afl-fuzz -n -i in/ -o out/ -- ./test 

afl-fuzz 2.35b by <lca...@google.com>

[+] You have 2 CPU cores and 1 runnable tasks (utilization: 50%).

[+] Try parallel jobs - see /usr/local/share/doc/afl/parallel_fuzzing.txt.

[*] Checking CPU core loadout...

[+] Found a free CPU core, binding to #0.

[*] Checking core_pattern...

[*] Setting up output directories...

[+] Output directory exists but deemed OK to reuse.

[*] Deleting old session data...

[+] Output dir cleanup successful.

[*] Scanning 'in/'...

[-] PROGRAM ABORT : Test case 'in//test' is too big (1.40 MB, limit is 1.00 MB)

         Location : read_testcases(), afl-fuzz.c:1466

najeeb@najeeb:~/Music/ctf/roptuts/test$ 

[Florian Weimer]

* Najeeb Choudhary:

> this is error when i compile with afl-clang and fuzz with afl-fuzzer (note:
> this error not show when code compile with gcc)
> najeeb@najeeb:~/Music/ctf/roptuts/test$ ls
> in input out test test.c
> najeeb@najeeb:~/Music/ctf/roptuts/test$ afl-fuzz -n -i in/ -o out/ --
> ./test
> afl-fuzz 2.35b by <lca...@google.com>
> [+] You have 2 CPU cores and 1 runnable tasks (utilization: 50%).
> [+] Try parallel jobs - see /usr/local/share/doc/afl/parallel_fuzzing.txt.
> [*] Checking CPU core loadout...
> [+] Found a free CPU core, binding to #0.
> [*] Checking core_pattern...
> [*] Setting up output directories...
> [+] Output directory exists but deemed OK to reuse.
> [*] Deleting old session data...
> [+] Output dir cleanup successful.
> [*] Scanning 'in/'...
>
> [-] PROGRAM ABORT : Test case 'in//test' is too big (1.40 MB, limit is 1.00
> MB)
> Location : read_testcases(), afl-fuzz.c:1466
>
> najeeb@najeeb:~/Music/ctf/roptuts/test$

It seems you accidentally used your fuzz target “test” as a fuzz
input.

[Najeeb Choudhary]

sorry but i don't get.......may i know how i resolver is issue 

[Florian Weimer]

* Najeeb Choudhary:

> sorry but i don't get.......may i know how i resolver is issue

You copied your test program into the AFL input directory.

[Najeeb Choudhary]

thanks for helping me.... your really helpful

i war this "afl-fuzz -i in/ -o out/ ../lab @@" AND i don't that is use @@ is there