Radare2 ptrace can not attach

Question

First my setup: Linux Mint 64bit 4.15.0-20-generic

radare2 the newest version from github

/etc/sysctl.d/10-ptrace.conf = 0

Executable: ELF 64-bit LSB executable, x86-64

read write and executable, i can run it with gdb or execute it from terminal

Name = crackme01

What ive done as root:

i verified with ps -ef | grep gdb ps -ef | grep ptrace ps -ef | grep r2 that only my single r2 is trying to attach. then:

1. r2 -d crackme01 2. doo

The error i am getting:

ptrace (PT_ATTACH): Operation not permitted

I found other questions from people with the same problem, but none of their solutions could solve my problem. I would really appreciate it, if someone could help me.

Answer 1

This error message probably should be ignored. I found something on the radare2 github

"These ptrace (PT_ATTACH): Operation not permitted messages seem to happen because of subsequent PT_ATTACH calls to the same pid, even though it is already attached. This should be fixed, but it probably shouldn't cause any major issues right now." ~thestr4ng3r

In my case i also did some mistake with radare2 (i forgot to analyse aaa), thats the reason it "didnt work". I ignored this message, proceeded and solved this beginner crackme.