5 ms·

I tried this on Ubuntu 22.04.1 and got an error: $ reptyr 10330

by _kst_ 4y ago

I tried this on Ubuntu 22.04.1 and got an error: $ reptyr 10330 Unable to attach to pid 10330: Operation not permitted The kernel denied permission while attaching. If your uid matches the target's, check the value of /proc/sys/kernel/yama/ptrace_scope. For more information, see /etc/sysctl.d/10-ptrace.conf $ I haven't (yet) looked into how to fix or work around this problem.

LooseMarmoset 4y ago
were you root?
- _kst_ 4y ago
  No, I wasn't root.
tyingq 4y ago
Either, as root: # echo 0 > /proc/sys/kernel/yama/ptrace_scope or permanently by editing the file /etc/sysctl.d/10-ptrace.conf
- metadat 4y ago
  What are the costs and / or downsides to enabling prace_scope?
  - ollien 4y ago
    https://askubuntu.com/a/153970 https://askubuntu.com/a/153970 > What are the risks in setting ptrace_scope to 0? > - This restores the old behavior where one process can "trace" another process, even if there is no parent-child relationship. > - In theory, a piece of malware can use this to harm you/your computer; e.g. it can attach to Firefox and log all of your URLs/passwords, etc. In practice this is extremely unlikely unless you blindly install binary debs from random sites, etc. > - As far as debugging goes, the 0 settings is in fact required for gdb, strace, etc. to attach to non-children unless you run them with elevated privileges (sudo).