check_afl_requirements() error

[zhangpwxwk]

Hello: I'v build a docker image for fuzzware. When I use fuzzware in docker, there is an error, messages as follow:

zhangpeng@zhangpeng-virtual-machine:~/fuzzware$ ./run_docker.sh [] defaulting to targets_dir '/home/zhangpeng/fuzzware/examples' [] defaulting to cmd '/bin/bash' [+] Mapping local dir '/home/zhangpeng/fuzzware/examples' into container [+] Executing command: '/bin/bash' [+] Running with -it user@825f07b43f9d:~/fuzzware/targets$ fuzzware pipeline P2IM/CNC/ --skip-afl-cpufreq --run-for 1:00:00 [08-16 08:20:27 INFO] init.py - Executing pipeline at 2023-08-16 08:20:27.343517 [08-16 08:20:27 INFO] init.py - Got projdir: /home/user/fuzzware/targets/P2IM/CNC [08-16 08:20:27 INFO] init.py - Found 'base_inputs' dir in target directory, using that as base input [08-16 08:20:27 INFO] init.py - Performing initial tests [08-16 08:20:27 ERROR] init.py - Failed: core_pattern check [08-16 08:20:27 ERROR] init.py - XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX Did you configure your system so that a plain fuzzer will run correctly? For afl, this would be (on the host, as root): echo core >/proc/sys/kernel/core_pattern cd /sys/devices/system/cpu echo performance | tee cpu*/cpufreq/scaling_governor

Try the fuzzing command line from the output above XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Then I read the source code in init.py ,I found the error is generated by function:check_afl_requirements() .

def check_afl_requirements(): check_failed = False try: with open("/proc/sys/kernel/core_pattern", "rb") as f: contents = f.read(1) if len(contents) == 1 and contents == b'|': logger.error("Failed: core_pattern check") check_failed = True except FileNotFoundError: pass

if os.getenv("AFL_SKIP_CPUFREQ") is None:
    try:
        with open("/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor", "rb") as f:
            contents = f.read()
            if not contents.startswith(b'perf'):
                with open("/sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq", "rb") as f:
                    contents = f.read()
                    min_freq = int(contents)
                with open("/sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq", "rb") as f:
                    contents = f.read()
                    max_freq = int(contents)
                if min_freq != max_freq:
                    logger.error("Failed: min vs max scaling")
                    check_failed = True
    except FileNotFoundError:
        pass

if check_failed:
    logger.error("\nXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\nDid you configure your system so that a plain fuzzer will run correctly?\nFor afl, this would be (on the host, as root):\necho core >/proc/sys/kernel/core_pattern\ncd /sys/devices/system/cpu\necho performance | tee cpu*/cpufreq/scaling_governor\n\nTry the fuzzing command line from the output above\nXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n")
    exit(1)

Has anyone encountered this problem? Thank you

[Scepticz]

Hi zhangpwxwk,

have you run the suggested command?

sudo su
echo core >/proc/sys/kernel/core_pattern

Tobi

[zhangpwxwk]

The result:

@.***:~/fuzzware/targets$ echo core >/proc/sys/kernel/core_pattern

bash: /proc/sys/kernel/core_pattern: Read-only file system

@.***:~/fuzzware/targets$ sudo su

@.***:/home/user/fuzzware/targets# echo core >/proc/sys/kernel/core_pattern

bash: /proc/sys/kernel/core_pattern: Read-only file system

@.***:/home/user/fuzzware/targets#

At 2023-08-16 17:26:34, "Tobias Scharnowski" @.***> wrote:

Hi zhangpwxwk,

have you run the suggested command?

sudo su echo core >/proc/sys/kernel/core_pattern

Tobi

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[Scepticz]

The read-only filesystem usually stems from running the command from within the docker container. The message suggests running the command on the host: For afl, this would be (on the host, as root):

Have you tried that as well?

[zhangpwxwk]

After run the commond on the host as root , fuzzware works, Thank you very much.

@.***:~/fuzzware$ echo core >/proc/sys/kernel/core_pattern

bash: /proc/sys/kernel/core_pattern: 权限不够

@.***:~/fuzzware$ sudo su

[sudo] zhangpeng 的密码：

@.***:/home/zhangpeng/fuzzware# echo core >/proc/sys/kernel/core_pattern

@.***:/home/zhangpeng/fuzzware# su

@.***:/home/zhangpeng/fuzzware# su zhangpeng

Even though, it works,I want to know why we have to run the command.

At 2023-08-16 21:57:59, "Tobias Scharnowski" @.***> wrote:

The read-only filesystem usually stems from running the command from within the docker container. The message suggests running the command on the host: For afl, this would be (on the host, as root):

Have you tried that as well?

— Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you authored the thread.Message ID: @.***>