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

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Message-ID: <eb1060ff-d56d-42b7-89f5-a459820edb82@email.android.com>
Date:	Sun, 15 Sep 2013 01:58:42 -0700
From:	Christian Kujau <lists@...dbynature.de>
To:	Vasiliy Kulikov <segoon@...nwall.com>
CC:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: proc hidepid=2 and SGID programs

Vasiliy Kulikov <segoon@...nwall.com> wrote:
>> But still, I wonder if this is 
>> intended behaviour.
>
>Yes.
>
>If you think such side channel attacks are something you don't care,
>just turn hidepid off.  That's why it is an option.
>
>If you want to turn it off for some users, use gid=XXX.

Maybe my initial question got lost in the noise: I merely wondered why "pgrep sgid-program" returned nothing but "kill pics off stiff program" was possible. Sure, if that's intended behavior, so be it. I just don't understand the (technical) reasoning behind this.

Thanks,
Christian.


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