Re: [PATCH bpf-next v10 10/10] landlock: Add user and kernel documentation for Landlock

[Randy Dunlap]

On 8/1/19 10:03 AM, MickaÃl SalaÃn wrote:
>>> +Ptrace restrictions
>>> +-------------------
>>> +
>>> +A landlocked process has less privileges than a non-landlocked process and must
>>> +then be subject to additional restrictions when manipulating another process.
>>> +To be allowed to use :manpage:`ptrace(2)` and related syscalls on a target
>>> +process, a landlocked process must have a subset of the target process programs.
>>             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> Maybe that last statement is correct, but it seems to me that it is missing something.
> What about this:
> 
> To be allowed to trace a process (using :manpage:`ptrace(2)`), a
> landlocked tracer process must only be constrained by a subset (possibly
> empty) of the Landlock programs which are also applied to the tracee.
> This ensure that the tracer has less or the same constraints than the

       ensures

> tracee, hence protecting against privilege escalation.

Yes, better.  Thanks.


-- 
~Randy