# Re: Review of ptrace Yama ptrace\_scope description

- From: Michael Kerrisk (man-pages) \<hidden\>
- Date: 2016-06-29 04:50:09 
- List: linux-api
- Page: https://ratatoskr.run/linux-api/2016/06/4784856
- Thread: https://ratatoskr.run/linux-api/2016/06/4782427/t.md

```text
Hi Jann,
...

>> So I've made that section of text:
>>
>>        A  process  that  has the CAP_SYS_PTRACE capability can update the
>>        /proc/sys/kernel/yama/ptrace_scope file with one of the  following
>>        values:
>>
>>        0 ("classic ptrace permissions")
>>               No  additional  restrictions  on  operations  that  perform
>>               PTRACE_MODE_ATTACH checks (beyond those imposed by the com‐
>>               moncap and other LSMs).
>>
>>               The use of PTRACE_TRACEME is unchanged.
>>
>>        1 ("restricted ptrace") [default value]
>>               When    performing    an    operation   that   requires   a
>>               PTRACE_MODE_ATTACH check, the calling process  must  either
>>               have the CAP_SYS_PTRACE capability in the user namespace of
>>               the target process or it  have  a  predefined  relationship
>>               with  the target process.
>
> Nit: The grammar in this sentence seems wrong to me.
> s/or it have/or it must have/?

Yep, thanks for catching that. Fixed now.

Cheers,

Michael


-- 
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Linux/UNIX System Programming Training: http://man7.org/training/
```