linux-kernel - Re: proc hidepid=2 and SGID programs

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Date:	Tue, 10 Sep 2013 01:30:28 -0700 (PDT)
From:	Christian Kujau <lists@...dbynature.de>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
cc:	LKML <linux-kernel@...r.kernel.org>,
	Vasiliy Kulikov <segoon@...nwall.com>
Subject: Re: proc hidepid=2 and SGID programs

On Sun, 8 Sep 2013 at 23:42, Eric W. Biederman wrote:
> I don't have a clue why anyone would want to hide processes, and make
> their own lives more difficult.

Oh, there are plenty of usescases, I'm sure. And I for one am thankful 
that this process hiding option made it into the kernel. Or, to answer in 
another way: why would anyone want to see other peoples processes?

> The check with hidepid is can you ptrace the process.  I expect there
> is something with those sgid processes that keeps you from ptracing
> them.

Indeed, I cannot strace the process. But still, I wonder if this is 
intended behaviour.
 
> Of course if you don't like the silly behavior you can always disable
> it.

:-)

C.
-- 
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